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Sample records for pituitary tumor shrinkage

  1. Pituitary Tumors

    Science.gov (United States)

    ... institutes of the National Institutes of Health (NIH) conduct research related to brain tumors, including pituitary tumors, in their laboratories at ... institutes of the National Institutes of Health (NIH) conduct research related to brain tumors, including pituitary tumors, in their laboratories at ...

  2. Pituitary tumor

    Science.gov (United States)

    ... enough of its hormones. This condition is called hypopituitarism . The causes of pituitary tumors are unknown. Some ... Cyst Endocrine glands Gigantism Growth hormone test Hyperthyroidism Hypopituitarism Multiple endocrine neoplasia (MEN) I Prolactin blood test ...

  3. Pituitary Tumors: Condition Information

    Science.gov (United States)

    ... and metabolism. Thyroid-stimulating hormone is involved in growth, body temperature, and heart rate. Nonfunctioning pituitary tumors (also called nonsecretory tumors) do not produce hormones. They can press on or damage the pituitary ...

  4. Pituitary Tumors

    Science.gov (United States)

    ... impairment, and behavioral changes. Tumors can also either produce excessive amounts of hormone or limit how much hormone is produced. The hormones most commonly affected include: growth hormone (regulates body height and structure), prolactin (controls ...

  5. Pituitary tumors containing cholecystokinin

    DEFF Research Database (Denmark)

    Rehfeld, J F; Lindholm, J; Andersen, B N

    1987-01-01

    We found small amounts of cholecystokinin in the normal human adenohypophysis and therefore examined pituitary tumors from 87 patients with acromegaly, Cushing's disease, Nelson's syndrome, prolactinoma, or inactive pituitary adenomas. Five adenomas associated with Nelson's syndrome contained...

  6. Pituitary tumors containing cholecystokinin

    DEFF Research Database (Denmark)

    Rehfeld, J F; Lindholm, J; Andersen, B N

    1987-01-01

    We found small amounts of cholecystokinin in the normal human adenohypophysis and therefore examined pituitary tumors from 87 patients with acromegaly, Cushing's disease, Nelson's syndrome, prolactinoma, or inactive pituitary adenomas. Five adenomas associated with Nelson's syndrome contained......'s disease and 7 acromegaly with adenomas containing ACTH. The cholecystokinin peptides from the tumors were smaller and less sulfated than cholecystokinin from normal pituitary glands. We conclude that ACTH-producing pituitary cells may also produce an altered form of cholecystokinin....

  7. Familial pituitary tumor syndromes.

    Science.gov (United States)

    Elston, Marianne S; McDonald, Kerrie L; Clifton-Bligh, Roderick J; Robinson, Bruce G

    2009-08-01

    The vast majority of pituitary tumors are benign and occur sporadically; however, they can still result in significant morbidity and even premature mortality through mass effects and hormone dysfunction. The etiology of sporadic tumors is still poorly understood; by contrast, advances have been made in our understanding of familial pituitary adenoma syndromes in the past decade. Currently, four genes are known to be associated with familial pituitary tumor syndromes: MEN1, CDKN1B, PRKAR1A and AIP. The first three genes are associated with a variety of extrapituitary pathologies, for example, primary hyperparathyroidism with multiple endocrine neoplasia type 1, which might aid identification of these syndromes. By contrast, AIP mutations seem to occur in the setting of isolated familial pituitary adenomas, particularly of the growth-hormone-secreting subtype. Awareness and identification of familial pituitary tumor syndromes is important because of potential associated pathologies and important implications for family members. Here, we review the current knowledge of familial pituitary tumor syndromes.

  8. General Information about Pituitary Tumors

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    ... Tumors Treatment Pituitary Tumors Treatment (PDQ®)–Patient Version General Information About Pituitary Tumors Go to Health Professional ... by many other glands in the body. Enlarge Anatomy of the inside of the brain, showing the ...

  9. Pituitary gland tumors; Hypophysentumoren

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    Jesser, J.; Schlamp, K.; Bendszus, M. [Radiologische Klinik, Universitaetsklinikum Heidelberg, Abteilung fuer Neuroradiologie, Heidelberg (Germany)

    2014-10-15

    This article gives an overview of the most common tumors of the pituitary gland and the differential diagnostics with special emphasis on radiological diagnostic criteria. A selective search of the literature in PubMed was carried out. Pituitary adenomas constitute 10-15 % of all intracranial tumors and are the most common tumors of the sellar region. Tumors smaller than 1 cm in diameter are called microadenomas while those larger than 1 cm in diameter are called macroadenomas. Approximately 65 % of pituitary gland adenomas secrete hormones whereby approximately 50 % secrete prolactin, 10 % secrete growth hormone (somatotropin) and 6 % secrete corticotropin. Other tumors located in the sella turcica can also cause endocrinological symptoms, such as an oversecretion of pituitary hormone or pituitary insufficiency by impinging on the pituitary gland or its stalk. When tumors spread into the space cranial to the sella turcica, they can impinge on the optic chiasm and cause visual disorders. A common differential diagnosis of a sellar tumor is a craniopharyngeoma. In children up to 10 % of all intracranial tumors are craniopharyngeomas. Other differential diagnoses for sellar tumors are metastases, meningiomas, epidermoids and in rare cases astrocytomas, germinomas or Rathke cleft cysts As these tumors are located in an anatomically complex region of the skull base and are often very small, a highly focused imaging protocol is required. The currently favored modality is magnetic resonance imaging (MRI) with the administration of a contrast agent. The sellar region should be mapped in thin slices. In cases of suspected microadenoma the imaging protocol should also contain a sequence with dynamic contrast administration in order to assess the specific enhancement characteristics of the tumor and the pituitary gland. (orig.) [German] Diese Arbeit ist eine Uebersicht ueber die haeufigsten Hypophysentumoren und deren Differenzialdiagnosen mit Augenmerk auf die

  10. Subarachnoid hemorrhage in pituitary tumor

    Directory of Open Access Journals (Sweden)

    Ashis Patnaik

    2013-01-01

    Full Text Available Subarachnoid hemorrhage (SAH is the bleeding into the subarachnoid space containing cerebrospinal fluid. The most common cause of SAH is trauma. Rupture of aneurysms, vascular anomalies, tumor bleeds and hypertension are other important etiologies. SAH in the setting of pituitary tumor can result from various causes. It can be due to intrinsic tumor related pathology, injury to surrounding the vessel during the operative procedure or due to an associated aneurysm. We discuss the pathological mechanisms and review relevant literature related to this interesting phenomenon. Early and accurate diagnosis of the cause of the SAH in pituitary tumors is important, as this influences the management.

  11. What Are Pituitary Tumors?

    Science.gov (United States)

    ... grow and to make steroid hormones (such as cortisol). Too much ACTH from the pituitary causes Cushing’s ... Cancer Atlas Press Room Cancer Statistics Center Volunteer Learning Center Follow Us Twitter Facebook Instagram Cancer Information, ...

  12. Temozolomide treatment in aggressive pituitary tumors and pituitary carcinomas: a French multicenter experience.

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    Raverot, Gérald; Sturm, Nathalie; de Fraipont, Florence; Muller, Marie; Salenave, Sylvie; Caron, Philippe; Chabre, Olivier; Chanson, Philippe; Cortet-Rudelli, Christine; Assaker, Richard; Dufour, Henry; Gaillard, Stephan; François, Patrick; Jouanneau, Emmanuel; Passagia, Jean-Guy; Bernier, Michèle; Cornélius, Aurélie; Figarella-Branger, Dominique; Trouillas, Jacqueline; Borson-Chazot, Françoise; Brue, Thierry

    2010-10-01

    To date only 18 patients with aggressive pituitary tumors or carcinomas treated with temozolomide have been reported. Increased expression of O6-methylguanine-DNA-methyltranferase (MGMT) has been suggested to predict resistance to temozolomide. The objective of the study was to describe the antitumoral efficacy and toxicity of temozolomide in patients with aggressive pituitary tumors or carcinomas and evaluate the possible prognostic value of MGMT promoter methylation and protein expression. Eight patients, five with pituitary carcinomas (three prolactin (PRL) and two ACTH) and three with aggressive pituitary tumors (one PRL and two ACTH), all treated with temozolomide administered orally for four to 24 cycles, were included in our French multicenter study. MGMT expression was assessed by immunohistochemistry and MGMT promoter methylation by pyrosequencing. Three of the eight patients (two ACTH adenomas and one PRL carcinoma) responded to temozolomide as demonstrated by significant tumor shrinkage and reduced hormone secretion. Three cycles of temozolomide were sufficient to identify treatment-responsive patients. Additional cycles did not improve treatment efficacy in those not responding, even when associated with carboplatin and vepeside. MGMT expression did not predict tumoral response to temozolomide because it was positive in one responder and negative in two nonresponders. Similarly, MGMT promoter methylation (three of seven tumors) did not predict clinical response. Toxicity remained mild in all patients. Temozolomide treatment may be an effective option for some aggressive pituitary tumors or carcinomas. Response to a trial of three cycles of treatment seems sufficient to identify responders and more reliable than patient MGMT status.

  13. Rheumatic manifestations of pituitary tumors.

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    Stavrou, S; Kleinberg, D L

    2001-10-01

    Pituitary tumors may cause rheumatologic problems as a result of under production or overproduction of one pituitary hormone. Excessive growth hormone causes destruction of cartilage by a direct action. Facial and acral changes and arthralgias may be some of the first symptoms of acromegaly. The arthritis associated with acromegaly is often devastating. Carpal tunnel syndrome is very common in patients with acromegaly. Adrenocorticotropin (ACTH) has indirect effects via the action of glucocorticoid on bones, muscles, and the immune system. Proximal muscle weakness is a characteristic feature of Cushing's syndrome. Patients with Cushing's syndrome commonly have osteopenia and osteoporosis that lead to an increase in bone fractures. Avascular necrosis is associated with exogenous steroid administration. The effects of too much glucocorticoid or too rapid withdrawal can be severe. Gonadotropins act via the gonadal steroids and protect bone mass from loss. Prolactin is less involved in rheumatologic disease; the data for which are limited in humans. Pituitary tumors can have manifestations similar to rheumatologic disorders and should be included in the differential diagnosis of these diseases.

  14. What Are the Symptoms of Pituitary Tumors?

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    ... Clinical Trials Resources and Publications What are the symptoms of pituitary tumors? Skip sharing on social media links Share this: Page Content Symptoms of Functioning Tumors The symptoms of functioning tumors ...

  15. Exploiting tumor shrinkage through temporal optimization of radiotherapy

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    Unkelbach, Jan; Hong, Theodore; Papp, David; Ramakrishnan, Jagdish; Salari, Ehsan; Wolfgang, John; Bortfeld, Thomas

    2013-01-01

    In multi-stage radiotherapy, a patient is treated in several stages separated by weeks or months. This regimen has been motivated mostly by radiobiological considerations, but also provides an approach to reduce normal tissue dose by exploiting tumor shrinkage. The paper considers the optimal design of multi-stage treatments, motivated by the clinical management of large liver tumors for which normal liver dose constraints prohibit the administration of an ablative radiation dose in a single treatment. We introduce a dynamic tumor model that incorporates three factors: radiation induced cell kill, tumor shrinkage, and tumor cell repopulation. The design of multi-stage radiotherapy is formulated as a mathematical optimization problem in which the total dose to the liver is minimized, subject to delivering the prescribed dose to the tumor. Based on the model, we gain insight into the optimal administration of radiation over time, i.e. the optimal treatment gaps and dose levels. We analyze treatments consisting ...

  16. Recent advances in pituitary tumor management.

    Science.gov (United States)

    Winder, Mark J; Mayberg, Marc R

    2011-08-01

    Advances in the neurosurgical management of pituitary tumors have included the refinement of surgical access and significant progress in navigation technology to help further reduce morbidity and improve outcome. Similarly, stereotactic radiosurgery has evolved to become an integral part in pituitary tumors not amenable to medical or surgical treatment. The evolution of minimally invasive surgery has evolved toward endoscopic versus microscopic trans-sphenoidal approaches for pituitary tumors. Debate exists regarding each approach, with advocates for both championing their cause. Stereotactic and fractional radiosurgery have been shown to be a safe and effective means of controlling tumor growth and ensuring hormonal stabilization, with longer-term data available for GammaKnife compared with CyberKnife. The advances in trans-sphenoidal surgical approaches, navigation technological improvements and the current results of stereotactic radiosurgery are discussed.

  17. Non-functioning pituitary tumors: 2012 update.

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    Cámara Gómez, Rosa

    2014-03-01

    Non-functioning pituitary adenomas are the most common pituitary macroadenomas in adults, accounting for approximately 14%-28% of all clinically relevant pituitary tumors. They are a heterogeneous group of tumors that cause symptoms by compression and/or hormone deficiencies. The possibility of tumor growth is increased in macroadenomas and solid tumors as compared to microadenomas and cystic tumors. Diagnosis is based on imaging procedures (magnetic resonance imaging), but there are studies reporting promising potential biomarkers. Transsphenoidal surgery remains the first therapeutic option for large tumors with compressive symptoms. There is no evidence that endoscopic procedures improve outcomes, but they decrease morbidity. There is no unanimity in finding prognostic predictors of recurrence. Radiosurgery achieves tumor control and, sometimes, adenoma size reduction. Its adverse effects increase with higher doses and tumor sizes>4cm(3). Drug treatment is of little value. In aggressive non-functioning tumors, temozolomide (TMZ) may be used with caution because no controlled studies are available. TMZ achieves tumor control in 38%-40% of aggressive non-functioning tumors. The optimal treatment regimen and duration have not been defined yet. Lack of response to TMZ after 3 cycles predicts for treatment resistance, but initial response does not ensure optimal mid or long-term results. O6-methylguanine-DNA methyltransferase expression has a limited predictive value of response to treatment with TMZ in aggressive non-functioning tumors. It should therefore not be a determinant factor in selection of patients to be treated with TMZ. Copyright © 2012 SEEN. Published by Elsevier Espana. All rights reserved.

  18. Radiation Therapy of Pituitary Tumors

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    Park, Moon Baik; Hong, Seong Eong [Kyunghee University College of Medicine, Seoul (Korea, Republic of)

    1989-12-15

    Radiation treatment results were analyzed in a retrospective analysis of 47 patients with pituitary adenoma treated with radiation alone or combined with surgery from 1974 through 1987 at the Department of Therapeutic Radiology of Kyung Hee University. The 5-year overall survival rates for all patients was 80.4%. Radiation therapy was effective for improving visual symptoms and headache, but could not normalize amenorrhea and galactorrhoea. There was no difference of survival rate between radiation alone and combination with surgery. Prognostic factors such as age, sex, disease type, visual field, headache and surgical treatment were statistically no significant in survival rates of these patients.

  19. [Pituitary tumors manifesting with amenorrhea-galactorrhea].

    Science.gov (United States)

    Bartal, A; Razon, N

    1976-05-16

    The amenorrhea-galactorrhea syndrome which occurs at a time other than the post-partum period is most often seen in association with a tumor of the pituitary gland; the symptoms are caused by a hypersecretion of prolactin. Among a series of 19 patients in Tel Aviv who underwent surgery for treatment of pituitary tumors, 2 presented with the amenorrhea-galactorrhea syndrome. The first patient, a 16 year old, presented with headaches, nausea, and diplopia; she underwent a series of 3 surgical procedures and died of a respiratory arrest in the third post-operative period. The second patient was a 39 year old woman who had borne 5 children; she presented with loss of vision, underwent surgery, and did well post-operatively. The authors point out that whereas either amenorrhea or galactorrhea alone may be associated with a number of disorders, the combination of the two symptoms is characteristic of pituitary tumors. Both patients who were presented in this article had chromophobe adenomas of the pituitary. The authors also discuss the various biologic actions of prolactin and its interrelationships with other hormones.

  20. Autocrine IL-6 mediates pituitary tumor senescence

    Science.gov (United States)

    Fuertes, Mariana; Ajler, Pablo; Carrizo, Guillermo; Cervio, Andrés; Sevlever, Gustavo; Stalla, Günter K.; Arzt, Eduardo

    2017-01-01

    Cellular senescence is a stable proliferative arrest state. Pituitary adenomas are frequent and mostly benign, but the mechanism for this remains unknown. IL-6 is involved in pituitary tumor progression and is produced by the tumoral cells. In a cell autonomous fashion, IL-6 participates in oncogene-induced senescence in transduced human melanocytes. Here we prove that autocrine IL-6 participates in pituitary tumor senescence. Endogenous IL-6 inhibition in somatotroph MtT/S shRNA stable clones results in decreased SA-β-gal activity and p16INK4a but increased pRb, proliferation and invasion. Nude mice injected with IL-6 silenced clones develop tumors contrary to MtT/S wild type that do not, demonstrating that clones that escape senescence are capable of becoming tumorigenic. When endogenous IL-6 is silenced, cell cultures derived from positive SA-β-gal human tumor samples decrease the expression of the senescence marker. Our results establish that IL-6 contributes to maintain senescence by its autocrine action, providing a natural model of IL-6 mediated benign adenoma senescence. PMID:27902467

  1. Management of incidental pituitary tumors

    Directory of Open Access Journals (Sweden)

    Nicholas F. Marko

    2011-11-01

    Full Text Available Pituitary incidentalomas are common lesions for which neurosurgical referrals may become progressively more frequent, given the increasing application of neuroimaging. The initial evaluation of a patient with radiographic evidence of an incidentaloma should focus on addressing two questions: (1 is the lesion causing neurological symptoms, and (2 is the lesion hormonally active? The answers to these two questions provide a framework for subsequent clinical management. The initial patient assessment should include a detailed history and physical examination, including the bedside assessment of visual fields. High-quality MRI imaging is essential, and formal visual field testing should be obtained in patients where the lesion abuts or compresses the optic apparatus. The initial biochemical workup is intended to assess potential pituitary hypo- or hyperfunction and should include measurement of serum levels of prolactin, insulin-like growth factor type-1, free thyroxine, testosterone, and an assessment of axis hypothalamic–pituitary–adrenal axis function. Additional testing may include serum thyroid-stimulating hormone, follicle-stimulating hormone, and luteinizing hormone levels. Neurologically-asymptomatic patients without endocrine dysfunction can be managed with observation at regular intervals, including MRI imaging at 6 months and 1 year and then annually for a period of 3 years. Follow-up biochemical assessment is not necessary in the absence of clinical symptoms or radiographic enlargement of the lesion. After 3 years the follow-up interval may be prolonged, although closer follow-up may be indicated for patients with lesions C1 cm. Most patients who either present with or who subsequently develop neurologic or endocrinologic symptoms should be considered for surgery as the first-line therapy.

  2. How Are Pituitary Tumors Diagnosed?

    Science.gov (United States)

    ... secreting tumor. Levels of related hormones, such as estrogen, progesterone, and testosterone, are often checked as well. Thyrotropin-secreting adenoma Tests to measure blood levels of thyrotropin (TSH) and thyroid hormones can usually identify people with a thyrotropin- ...

  3. Endoscopic transnasal approach for removing pituitary tumors

    Directory of Open Access Journals (Sweden)

    Mirian Cabral Moreira de Castro

    2014-05-01

    Full Text Available To describe a series of 129 consecutive patients submitted to the resection of pituitary tumors using the endoscopic transsphenoidal approach in a public medical center. Method: Retrospective analysis based on the records of patients submitted to the resection of a pituitary tumor through the endoscopic transsphenoidal approach between 2004 and 2009. Results: One hundred and twenty-nine records were analyzed. The tumor was non-secreting in 96 (74.42% and secreting in 33 patients (22.58%. Out of the secretory tumors, the most prevalent was the growth hormone producer (7.65%, followed by the prolactinoma, (6.98%. Eleven patients developed cerebral spinal fluid (CSF fistulas, and four of them developed meningitis. One patient died due to intracerebral hemorrhage in the postoperative period. Conclusion: The endoscopic transsphenoidal approach to sellar tumors proved to be safe when the majority of the tumors were non-secreting. The most frequent complication was CSF. This technique can be done even in a public hospital with financial limits, since the health professionals are integrated.

  4. Respiration rate in human pituitary tumor explants.

    Science.gov (United States)

    Anniko, M; Bagger-Sjöbäck, D; Hultborn, R

    1982-01-01

    Studies on the respiration rate of human pituitary tumor tissue have so far been lacking in the literature. This study presents the results from four adenomas causing acromegaly, all with different clinical degrees of the disease. Determination of oxygen uptake was performed in vitro with a spectrophotorespirometric system. Pieces of the tumors were explanted to an organ culture system with a high degree of stability. The secretion rate of growth hormone (GH) and prolactin (PRL) was determined. After 4-8 days in vitro, specimens were analyzed for respiration rate. This was approximately 1-1.5 microliters O2/h/micrograms dry weight. The activity of the pituitary tumor tissue was characterized by both the hormone secretion rate and the respiration rate. Particularly active foci were found to occur in the adenoma tissue. Depending on the individual tumor, the GH secretion rate was approximately 0.1-100 pmol/micrograms dry weight/h and PRL secretion rate approximately 0.4-18 micrograms/micrograms dry weight/h. The respiration rate--as is also the hormone secretion rate--is dependent on the time in vitro prior to analysis. The respiration rate in individual tumors is a parameter which does not reflect GH or PRL serum levels or clinical activity of the disease.

  5. Pituitary tumor apoplexy Apoplexia em tumor hipofisário

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    Claudia V. Chang

    2009-06-01

    Full Text Available Pituitary tumor apoplexy is a medical emergency due to acute infarction or hemorrhage in the pituitary gland. In this review, the authors discuss the sellar anatomy, the pituitary gland and adenomas' vascularization and the general aspects of the syndrome such as its ethiopatogenesis, predisposing factors, clinical features, treatment and prognosis.A apoplexia em tumor hipofisário é uma emergência médica decorrente do infarto agudo ou hemorrágico na glândula hipófise. Nesta revisão os autores discutem a anatomia da região selar, a vascularização da hipófise e adenomas hipofisários, e demais aspectos da síndrome como etiopatogenia, fatores predisponentes, quadro clínico, tratamento e prognóstico.

  6. Nonadenomatous tumors of the pituitary and sella turcica.

    Science.gov (United States)

    Huang, Benjamin Y; Castillo, Mauricio

    2005-07-01

    While pituitary adenomas make up over 90% of all sellar masses, there are a number of less known tumors, both malignant and benign, which may arise within the sella turcica. These include relatively common tumors such as meningiomas and craniopharyngiomas, as well as extremely rare tumors such as pituitary astrocytomas and granular cell tumors. Unfortunately, many of these tumors lack characteristic imaging features, often making it extremely difficult to distinguish them by imaging alone from the more common pituitary adenoma. In this article, we review several nonadenomatous tumors of the sella, with a focus on their clinical features and typical MR imaging characteristics.

  7. Pregnancy in patients with pituitary tumors.

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    Husami, N; Jewelewicz, R; Vande Wiele, R L

    1977-09-01

    Thirteen patients with pituitary tumors had a total of seventeen pregnancies. Nine of these patients were treated prior to conception (four by radiation therapy, four by hypophysectomy, and one with lergotrile); four patients received no treatment. The untreated group had a total of six pregnancies, two of which were complicated by visual symptoms which regressed spontaneously after delivery. One of the hypophysectomized patients developed diabetes insipidus at 34 weeks' gestation which resolved spontaneously after delivery. Of the four irradiated patients, one had a child with Down's syndrome and another had a child with multiple congenital anomalies who died. The clinical course and various modes of treatment of these patients are discussed and the pertinent literature is reviewed.

  8. Gamma knife radiosurgery for secreting pituitary tumors

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    Noren, G. [Brown Univ., Providence, RI (United States). Rhode Island Hospital; Jackson, I.M.D.; Chougule, P.; Zheng, Z.; Epstein, M.H.

    1998-09-01

    Transsphenoidal surgery usually represents first line treatment for pituitary adenomas with the aim of removing the tumor, decompressing the optic apparatus and, in secreting tumors, eliminating the hypersecretion. Gamma Knife radiosurgery is indicated for tumor remnants or recurrences in or above the sella including those invading the cavernous sinus and also as initial treatment in patients who are unable to tolerate an open surgical procedure and where medication has failed. In this study, the target definition was retrospectively studied and when necessary corrected in 10 acromegalic patients, 8 with Cushing`s disease, and 12 with prolactinomas undergoing Gamma Knife radiosurgery. The dose plan was analyzed and the volume of the target covered by a minimum of 15, 20, 25, 30 and 35 Gy was estimated. A dose/volume profile for each treatment was created and correlated to the endocrinological and clinical outcome. Cure, according to strict endocrinological criteria, was seen in 6 of the acromegalic patients, in 2 of the patients with ACTH hypersecretion, and in 2 of the patients with prolactinomas. Analysis of these profiles, also for the patients with partial effect, show that a minimum radiation dose of 20 Gy may be adequate to eliminate the hypersecretion in acromegalic patients whereas a dose of at least 25 Gy may be required in patients with Cushing`s disease and prolactinoma. (author)

  9. Tumor shrinkage by cyclopamine tartrate through inhibiting hedgehog signaling

    Institute of Scientific and Technical Information of China (English)

    Qipeng Fan; Arash Garrossian; Massoud Garrossian; Dale Gardner; Jingwu Xie; Dongsheng Gu; Miao He; Hailan Liu; Tao Sheng; Guorui Xie; Ching-xin Li; Xiaoli Zhang; Brandon Wainwright

    2011-01-01

    The link of hedgehog (Hh) signaling activation to human cancer and synthesis of a variety of Hh signaling inhibitors raise great expectation that inhibiting Hh signaling may be effective in human cancer treatment. Cyclopamine (Cyc), an alkaloid from the Veratrum plant, is a specific natural product inhibitor of the Hh pathway that acts by targeting smoothened (SMO) protein. However, its poor solubility, acid sensitivity, and weak potency relative to other Hh antagonists prevent the clinical development of Cyc as a therapeutic agent. Here, we report properties of cyclopamine tartrate salt (CycT) and its activities in Hh signaling-mediated cancer in vitro and in vivo. Unlike Cyc, CycT is water soluble (5-10 mg/mL). The median lethal dose (LD) of CycT was 62.5 mg/kg body weight compared to 43.5 mg/kg for Cyc, and the plasma half-life (T) of CycT was not significantly different from that of Cyc. We showed that CycT had a higher inhibitory activity for Hh signaling-dependent motor neuron differentiation than did Cyc (IC = 50nmol/L for CycT vs. 300 nmol/L for Cyc). We also tested the antitumor effectiveness of these Hh inhibitors using two mouse models of basal cell carcinomas (K14cre:Ptch1and K14cre:SmoM2). After topical application of CycT or Cyc daily for 21 days, we found that all CycT-treated mice had tumor shrinkage and decreased expression of Hh target genes. Taken together, we found that CycT is an effective inhibitor of Hh signaling-mediated carcinogenesis.

  10. Sudden and unexpected death from pituitary tumor apoplexy.

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    Shields, Lisa B E; Balko, M Gregory; Hunsaker, John C

    2012-01-01

    Pituitary tumor apoplexy refers to a clinical syndrome precipitated by the expansion of a pituitary adenoma by hemorrhage or infarction. Individuals may present with myriad signs, including sudden onset of severe headache, visual changes, altered mental status, cranial nerve palsies, and hormonal dysfunction. This disorder constitutes a medical emergency and warrants an expedited evaluation, diagnosis, and treatment to prevent the potential sequelae of permanent visual loss, endocrine abnormalities, or death. We report a case of sudden death from undiagnosed pituitary tumor apoplexy. The decedent was evaluated by medical personnel on three occasions in the week prior to her death for severe headache, nausea, vomiting, and photophobia. Postmortem examination demonstrated a hemorrhagic infarction of a pituitary adenoma with necrosis and expansion out of the sella turcica. The recognition of and treatment for a patient with pituitary tumor apoplexy requires a rapid multidisciplinary effort. Failure of prompt diagnosis may be fatal and require a medico-legal death investigation for sudden and unexpected death.

  11. Coexisting intracranial tumors with pituitary adenomas: Genetic association or coincidence?

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    Furtado Sunil

    2010-01-01

    Full Text Available The co-occurrence of two or more brain tumors with different histological features is rare. The authors report three rare cases of intracranial tumors associated with pituitary adenomas. Two of the pituitary tumors were functioning adenomas: a prolactinoma and a thyrotropin secreting adenoma. Two of the associated intracranial neoplasms were gliomas and one was a meningioma. Radiological and clinical examination for syndromal association was negative in all cases. We briefly discuss the presentation and treatment options of these cases and review the 19 previous publications in the literature of pituitary tumors occurring in association with other neoplasms and explore the possible links underlying these co-occurring neoplasms. Our three cases represent 0.86% of all pituitary tumors operated at our institute over a 9-year period.

  12. HMGA1-pseudogene expression is induced in human pituitary tumors

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    Esposito, Francesco; De Martino, Marco; D'Angelo, Daniela; Mussnich, Paula; Raverot, Gerald; Jaffrain-Rea, Marie-Lise; Fraggetta, Filippo; Trouillas, Jacqueline; Fusco, Alfredo

    2015-01-01

    Numerous studies have established that High Mobility Group A (HMGA) proteins play a pivotal role on the onset of human pituitary tumors. They are overexpressed in pituitary tumors, and, consistently, transgenic mice overexpressing either the Hmga1 or the Hmga2 gene develop pituitary tumors. In contrast with HMGA2, HMGA1 overexpression is not related to any rearrangement or amplification of the HMGA1 locus in these tumors. We have recently identified 2 HMGA1 pseudogenes, HMGA1P6 and HMGA1P7, acting as competitive endogenous RNA decoys for HMGA1 and other cancer related genes. Here, we show that HMGA1 pseudogene expression significantly correlates with HMGA1 mRNA levels in growth hormone and nonfunctioning pituitary adenomas likely inhibiting the repression of HMGA1 through microRNAs action. According to our functional studies, these HMGA1 pseudogenes enhance the proliferation and migration of the mouse pituitary tumor cell line, at least in part, through their upregulation. Our results point out that the overexpression of HMGA1P6 and HMGA1P7 could contribute to increase HMGA1 levels in human pituitary tumors, and then to pituitary tumorigenesis. PMID:25894544

  13. Aspergillosis of the sphenoid sinus simulating a pituitary tumor

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    Larranaga, J.; Fandino, J.; Gomez-Bueno, J.; Botana, C.; Rodriguez, D.; Gonzalez-Carrero, J.

    1989-09-01

    Sphenoidal aspergillosis is an unusual cause of sella turcica enlargement. Pituitary abscess secondary to Aspergillus had been reported. In the present case, a woman with sphenoid sinus aspergillosis mimiced a pituitary tumor. This patient survived her infection with intact pituitary function following a transsphenoidal approach. No postoperative amphotericine-B and 5-fluorocytosine were necessary. CT scan revealed a mass occupying the sphenoid sinus extending to the sella turcica. Factors that should alert the clinican to the presence of a sphenoidal and pituitary abscess in a patient with sella turcica enlargement are prior episodes of sinusitis, meningitis and immunosuppression and, as in the present case, hyperglycemia. (orig.).

  14. The molecular pathogenesis of pituitary tumors: implications for clinical management.

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    Dworakowska, D; Grossman, A B

    2012-06-01

    Pituitary adenomas are unique in several ways, and while they are rarely malignant they may be invasive and/or recurrent. Several attempts have been made to determine the growth potential of pituitary adenomas. Pituitary tumors predominantly arise in a sporadic setting or more rarely as part of hereditary genetic syndromes. Molecular analysis of these familial pituitary adenomas has provided significant insight into pituitary tumorigenesis. Some specific genes have been identified that predispose to pituitary neoplasia, but these are rarely involved in the pathogenesis of sporadic tumors. The number of genes or molecular alterations involved in pituitary tumorigenesis is progressively increasing, providing a hope for development of new predictive and prognostic markers. The aim of this review is to focus on the molecular pathology of pituitary adenomas in the context of their implications on management and targeted therapy. We have summarized our current knowledge on the molecular biology in familial and sporadic pituitary adenomas, and we subsequently focus on prognostic factors as well as specific predictive markers for new promising targeted therapies.

  15. What Happens After Treatment for Pituitary Tumors?

    Science.gov (United States)

    ... develop pituitary hormone deficiencies after surgery or radiation therapy. These people will need hormone replacement. Thyroid hormone and adrenal steroids can be taken as pills. In men, testosterone can be given to restore sex drive and ...

  16. Thyroxine 5'-deiodinase in human anterior pituitary tumors.

    Science.gov (United States)

    Itagaki, Y; Yoshida, K; Ikeda, H; Kaise, K; Kaise, N; Yamamoto, M; Sakurada, T; Yoshinaga, K

    1990-08-01

    The activity of T4 5'-monodeiodinase (5'D) in the pituitary was measured in 12 patients with pituitary adenoma (3 patients with acromegaly, 2 with prolactinoma, 1 with Cushing's disease, 1 with TSH-producing tumor, and 5 with nonfunctioning tumor) and, as a control, in a patient who died of parotid cancer. The pituitaries, obtained at operation or autopsy, were homogenized in 0.1 mol/L potassium phosphate buffer, pH 7.0, and centrifuged at 800 x g. Supernatants were incubated with [125I]T4 and 20 mmol/L dithiothreitol (DTT) at 37C for 90 min. T4 5'-D was measured by the release of 125I- with the ion exchange method. The activity of T4 5'-D in the pituitaries from patients with prolactinoma and parotid cancer was dependent on protein concentration, incubation time, incubation temperature, and T4 concentration, and was labile to prior heating at 70 C for 30 min. T4 5'-D was not inhibited by 1 mmol/L propylthiouracil, but was inhibited 95% by 0.1 mmol/L iopanoic acid. The apparent Km and maximum velocity for T4 5'-D in homogenates of prolactinoma at 20 mmol/L DTT were 11 nmol/L and 1.54 pmol/mg protein.h, respectively. This reaction followed sequential-type reaction kinetics when the DTT concentration was varied. All other homogenates of pituitary tumors, except two nonfunctioning tumors, also demonstrated T4 5'-D activity. These results indicate that 1) the human pituitary express a low Km and PTU-insensitive T4 5'-D activity which is very similar to the type II enzyme activity in the rat pituitary; and 2) various types of pituitary tumor cells contain T4 5'-D activity.

  17. Shrinkage insensitivity of NKCC1 in myosin II-depleted cytoplasts from Ehrlich ascites tumor cells

    DEFF Research Database (Denmark)

    Hoffmann, Else K; Pedersen, Stine F

    2007-01-01

    Protein phosphorylation/dephosphorylation and cytoskeletal reorganization regulate the Na(+)-K(+)-2Cl(-) cotransporter (NKCC1) during osmotic shrinkage; however, the mechanisms involved are unclear. We show that in cytoplasts, plasma membrane vesicles detached from Ehrlich ascites tumor cells (EATC...

  18. A geometric atlas to predict lung tumor shrinkage for radiotherapy treatment planning

    Science.gov (United States)

    Zhang, Pengpeng; Rimner, Andreas; Yorke, Ellen; Hu, Yu-Chi; Kuo, Licheng; Apte, Aditya; Lockney, Natalie; Jackson, Andrew; Mageras, Gig; Deasy, Joseph O.

    2017-02-01

    To develop a geometric atlas that can predict tumor shrinkage and guide treatment planning for non-small-cell lung cancer. To evaluate the impact of the shrinkage atlas on the ability of tumor dose escalation. The creation of a geometric atlas included twelve patients with lung cancer who underwent both planning CT and weekly CBCT for radiotherapy planning and delivery. The shrinkage pattern from the original pretreatment to the residual posttreatment tumor was modeled using a principal component analysis, and used for predicting the spatial distribution of the residual tumor. A predictive map was generated by unifying predictions from each individual patient in the atlas, followed by correction for the tumor’s surrounding tissue distribution. Sensitivity, specificity, and accuracy of the predictive model for classifying voxels inside the original gross tumor volume were evaluated. In addition, a retrospective study of predictive treatment planning (PTP) escalated dose to the predicted residual tumor while maintaining the same level of predicted complication rates for a clinical plan delivering uniform dose to the entire tumor. The effect of uncertainty on the predictive model’s ability to escalate dose was also evaluated. The sensitivity, specificity and accuracy of the predictive model were 0.73, 0.76, and 0.74, respectively. The area under the receiver operating characteristic curve for voxel classification was 0.87. The Dice coefficient and mean surface distance between the predicted and actual residual tumor averaged 0.75, and 1.6 mm, respectively. The PTP approach allowed elevation of PTV D95 and mean dose to the actual residual tumor by 6.5 Gy and 10.4 Gy, respectively, relative to the clinical uniform dose approach. A geometric atlas can provide useful information on the distribution of resistant tumors and effectively guide dose escalation to the tumor without compromising the organs at risk complications. The atlas can be further refined by using

  19. Pituitary macroadenoma presenting as a nasal tumor: case report

    Directory of Open Access Journals (Sweden)

    Nivaldo Adolfo Silva Junior

    Full Text Available CONTEXT: Pituitary macroadenomas are rare intracranial tumors. In a few cases, they may present aggressive behavior and invade the sphenoid sinus and nasal cavity, causing unusual symptoms. In this paper, we report an atypical case of pituitary adenoma presenting as a nasal mass.CASE REPORT: The patient was a 44-year-old woman who had had amenorrhea and galactorrhea for ten months, with associated nasal obstruction, macroglossia and acromegaly. Both growth hormone and prolactin levels were increased. Magnetic resonance imaging showed a large mass originating from the lower surface of the pituitary gland, associated with sella turcica erosion and tumor extension through the sphenoid sinus and nasal cavity. Histopathological analysis demonstrated a chromophobe pituitary adenoma with densely packed rounded epithelial cells, with some atypias and rare mitotic figures. There was no evidence of metastases.CONCLUSION: Macroadenoma invading the nasal cavity is a rare condition and few similar cases have been reported in the literature. This study contributes towards showing that tumor extension to the sphenoid sinus and nasopharynx needs to be considered and investigated in order to make an early diagnosis when atypical symptoms like nasal obstruction are present.

  20. Temozolomide-Induced Shrinkage of a Pituitary Carcinoma Causing Cushing's Disease — Report of a Case and Literature Review

    Directory of Open Access Journals (Sweden)

    Lorenzo Curtò

    2010-01-01

    Full Text Available Temozolomide (TMZ is an alkylating chemotherapeutic agent that has recently been used in some cases as a new therapeutic tool for pituitary carcinomas and aggressive pituitary adenomas. In this report, we present the case of effective TMZ treatment in a 42-year-old man with ACTH-secreting carcinoma. The tumor grew progressively over 4 years, from 2.2 to 31.1 cm3, despite three surgical approaches and gamma-knife treatment. Ki-67 increased from 2 to 18%. An intradural metastasis at the foramen magnum was detected by MRI after the third operation. Thereafter, four cycles of 5-day TMZ administration (200 mg/m2/day during the first, and 150 mg/m2/day during the following cycles induced dramatic tumor size reduction (>90%. Clinical conditions improved progressively and, after 17 months from the beginning of TMZ administration, the patient is still alive. The treatment was well tolerated except for a transient thrombocytopenia (grade 4 WHO.

  1. Quantitative evaluation of indium-111 (In-111) octreotide pituitary activity: Comparison in patient with and without pituitary tumors

    Energy Technology Data Exchange (ETDEWEB)

    Gupta, P.; Waxman, A.; Nguyen, K. [Cedars-Sinai Medical Center, Los Angeles, CA (United States)] [and others

    1995-05-01

    Indium 111 Octreotide is known to detect pituitary tumors. Variable low level pituitary activity has been reported in pts. with no demonstrable pituitary tumors. To our knowledge, there have been no studies which quantitatively categorize pituitary activity with respect to distinguishing normal subject from pts. with pituitary tumors. 13 pts. with proven, treated acromegaly were included, as well as 15 pts. with no history of pituitary disorder. Both groups underwent SPECT In-111 scintigraphy 24 hours post-injection Average count per pixel ratios were obtained for the pituitary/calvarium (P/C) and pituitary/brain (P/B) regions. 10 pts. with acromegaly underwent growth hormone (GH) measurements 2 hours post-glucose load. Statistical correlation between growth hormone levels using P/C and P/B ratios were obtained. P/C ratios, as well as P/B ratios demonstrated high correlation with serum GH levels correlation coefficient(r)= .717 for P/C p<0.05, and correlation coefficient(r) = 0.828 for P/B ratios p<0.005. P/C ratios and P/B ratios for controls correlated closely with the upper level of normal predicted by P/C or P/B ratios as a function of serum growth hormone found in patients with acromegaly. Somatostatin receptor SPECT scintigraphy of the pituitary and appropriate quantitation can predict patients with growth hormone secreting tumors.

  2. Is IGSF1 involved in human pituitary tumor formation?

    Science.gov (United States)

    Faucz, Fabio R; Horvath, Anelia D; Azevedo, Monalisa F; Levy, Isaac; Bak, Beata; Wang, Ying; Xekouki, Paraskevi; Szarek, Eva; Gourgari, Evgenia; Manning, Allison D; de Alexandre, Rodrigo Bertollo; Saloustros, Emmanouil; Trivellin, Giampaolo; Lodish, Maya; Hofman, Paul; Anderson, Yvonne C; Holdaway, Ian; Oldfield, Edward; Chittiboina, Prashant; Nesterova, Maria; Biermasz, Nienke R; Wit, Jan M; Bernard, Daniel J; Stratakis, Constantine A

    2015-02-01

    IGSF1 is a membrane glycoprotein highly expressed in the anterior pituitary. Pathogenic mutations in the IGSF1 gene (on Xq26.2) are associated with X-linked central hypothyroidism and testicular enlargement in males. In this study, we tested the hypothesis that IGSF1 is involved in the development of pituitary tumors, especially those that produce growth hormone (GH). IGSF1 was sequenced in 21 patients with gigantism or acromegaly and 92 healthy individuals. Expression studies with a candidate pathogenic IGSF1 variant were carried out in transfected cells and immunohistochemistry for IGSF1 was performed in the sections of GH-producing adenomas, familial somatomammotroph hyperplasia, and in normal pituitary. We identified the sequence variant p.N604T, which in silico analysis suggested could affect IGSF1 function, in two male patients and one female with somatomammotroph hyperplasia from the same family. Of 60 female controls, two carried the same variant and seven were heterozygous for other variants. Immunohistochemistry showed increased IGSF1 staining in the GH-producing tumor from the patient with the IGSF1 p.N604T variant compared with a GH-producing adenoma from a patient negative for any IGSF1 variants and with normal control pituitary tissue. The IGSF1 gene appears polymorphic in the general population. A potentially pathogenic variant identified in the germline of three patients with gigantism from the same family (segregating with the disease) was also detected in two healthy female controls. Variations in IGSF1 expression in pituitary tissue in patients with or without IGSF1 germline mutations point to the need for further studies of IGSF1 action in pituitary adenoma formation.

  3. Is IGSF1 involved in human pituitary tumor formation?

    Science.gov (United States)

    Faucz, Fabio R.; Horvath, Anelia D.; Azevedo, Monalisa F.; Levy, Isaac; Bak, Beata; Wang, Ying; Xekouki, Paraskevi; Szarek, Eva; Gourgari, Evgenia; Manning, Allison D.; de Alexandre, Rodrigo Bertollo; Saloustros, Emmanouil; Trivellin, Giampaolo; Lodish, Maya; Hofman, Paul; Anderson, Yvonne C; Holdaway, Ian; Oldfield, Edward; Chittiboina, Prashant; Nesterova, Maria; Biermasz, Nienke R.; Wit, Jan M.; Bernard, Daniel J.; Stratakis, Constantine A.

    2014-01-01

    IGSF1 is a membrane glycoprotein highly expressed in the anterior pituitary. Pathogenic mutations in the IGSF1 gene (on Xq26.2) are associated with X-linked central hypothyroidism and testicular enlargement in males. In this study we tested the hypothesis that IGSF1 is involved in the development of pituitary tumors, especially those that produce growth hormone (GH). IGSF1 was sequenced in 21 patients with gigantism or acromegaly and 92 healthy individuals. Expression studies with a candidate pathogenic IGSF1 variant were carried out in transfected cells and immunohistochemistry for IGSF1 was performed in sections from GH-producing adenomas, familial somatomammotroph hyperplasia and in normal pituitary. In two male patients, and in one female, with somatomammotroph hyperplasia from the same family, we identified the sequence variant p.N604T, which in silico analysis suggested could affect IGSF1 function. Of 60 female controls, two carried the same variant, and seven were heterozygous for other variants. Immunohistochemistry showed increase IGSF1 staining in the GH-producing tumor from the patient with the IGSF1 p.N604T variant compared to a GH-producing adenoma from a patient negative for any IGSF1 variants and to normal control pituitary tissue. The IGSF1 gene appears polymorphic in the general population. A potentially pathogenic variant identified in the germline of three patients with gigantism from the same family (segregating with the disease) was also detected in two healthy female controls. Variations in IGSF1 expression in pituitary tissue in patients with or without IGSF1 germline mutations point to the need for further studies of IGSF1 action in pituitary adenoma formation. PMID:25527509

  4. The correlation between aldehyde dehydrogenase-1A1 level and tumor shrinkage after preoperative chemoradiation in locally advanced rectal cancer

    Directory of Open Access Journals (Sweden)

    Rhandyka Rafli

    2015-12-01

    Full Text Available This study was performed to determine the correlation between aldehyde dehydrogenase-1A1 (ALDH1A1 level and tumor shrinkage after chemoradiation in locally advanced rectal cancer. This is a retrospective study of 14 locally advanced rectal cancer patients with long course neoadjuvant chemoradiation. ALDH1A1 level was measured using ELISA from paraffin embedded tissue. Tumor shrinkage was measured from computed tomography (CT scan or magnetic resonance imaging (MRI based on Response Evaluation Criteria in Solid Tumor v1.1 (RECIST v1.1. The mean of ALDH1A1 level was 9.014 ± 3.3 pg/mL and the mean of tumor shrinkage was 7.89 ± 35.7%. Partial response proportion was 28.6%, stable disease proportion was 50% and progressive disease proportion was 21.4%. There was a significant strong negative correlation (r = –0.890, plt; 0.001 between ALDH1A1 and tumor shrinkage. In conclusion, tumor shrinkage in locally advanced rectal cancer after preoperative chemoradiation was influenced by ALDH1A1 level. Higher level of ALDH1A1 suggests decreased tumor shrinkage after preoperative chemoradiation.

  5. The value of radiation therapy for pituitary tumors

    Energy Technology Data Exchange (ETDEWEB)

    Watari, Tsutomu [Dokkyo Univ., Mibu, Tochigi (Japan). School of Medicine

    1995-09-01

    Following points are discussed in this review. (1) Historical review of our previous therapeutic management. (2) Classification of pituitary adenomas. (3) Clinical analysis of my recent 58 cases. (4) Verification of usefulness of postoperative irradiation which achieved to increase in local control rate. (5) Authoritativeness of radiotherapy. In general, 3 to 4 portal technique or arc therapy were employed. The lateral opposing field technique was avoid to use. The recommended doses using linear accelerator x-ray technique is approximately 5000 cGy in 5 weeks. To prevent radiation hazard; (1) examiner should not use technique of two opposed fields, (2) total doses should not exceed 5000 cGy in 5 to 6 weeks and the use of daily fractions should not exceed 200 cGy. (6) Correlation of hormone secreting tumors and radiation therapy. (7) Problem of radiosurgery and heavy particle. (8) Countermeasure for recurrence cases. (9) Problem of side effects of radiotherapy and its precaution. Complication of radiation for pituitary adenoma found that the significant side effects are negligibly small in recent years. (10) Pituitary tumor are originally slow growing and benign tumor, therefore the response to irradiation takes long time to elapse for final evaluation. For instance, over 80 to 90% of acromegaly patients respond HGH successfully, but this may require from one to several years. (11) Conclusion. (author).

  6. Methodology for Registration of Shrinkage Tumors in Head-and-Neck CT Studies

    Directory of Open Access Journals (Sweden)

    Jianhua Wang

    2015-01-01

    Full Text Available Tumor shrinkage occurs in many patients undergoing radiotherapy for head-and-neck (H&N cancer. However, one-to-one correspondence is not always available between voxels of two image sets. This makes intensity-based deformable registration difficult and inaccurate. In this paper, we describe a novel method to increase the performance of the registration in presence of tumor shrinkage. The method combines an image modification procedure and a fast symmetric Demons algorithm to register CT images acquired at planning and posttreatment fractions. The image modification procedure modifies the image intensities of the primary tumor by calculating tumor cell survival rate using the linear quadratic (LQ model according to the dose delivered to the tumor. A scale operation is used to deal with uncertainties in biological parameters. The method was tested in 10 patients with nasopharyngeal cancer (NPC. Registration accuracy was improved compared with that achieved using the symmetric Demons algorithm. The average Dice similarity coefficient (DSC increased by 21%. This novel method is suitable for H&N adaptive radiation therapy.

  7. Hyperprolactinemia in nonpregnant women due to pituitary tumors.

    Science.gov (United States)

    Tolstoi, L G

    1986-06-02

    The human prolactin molecule has been isolated and its structure characterized. This anterior pituitary hormone plays an important function in the induction and maintenance of lactation in the post-partum nursing mother. Prolactin-producing tumors cause inappropriate lactation in the nonpregnant woman. Bromocriptine, an ergot derivative, mimics the action of dopamine in the anterior pituitary gland and does not cure the underlying pathology. Prior to the development of bromocriptine, there was no effective treatment for the symptoms of amenorrhea and galactorrhea. Although the methods of therapy are more sophisticated today, there remain a number of unanswered questions. The unknown long-term risks of bromocriptine therapy must be balanced against the potential risk of osteopenia.

  8. [Pituitary tumors: 10 years of experience].

    Science.gov (United States)

    Cecenarro, Laura Anahi; Rodrigo Fanton, Elica Tatiana; Estario, Paula; Papalini, Roque Francisco; Estario, María Éugenia

    2015-01-01

    Introducción: Los tumores hipofisarios comprenden la cuarta parte de las neoplasias intracraneales y los adenomas son el mayor porcentaje de ellos. Son de naturaleza benigna, pero pueden ser invasivos y producir impacto en la morbi-mortalidad. Objetivo: analizar las características clínicas de los pacientes con diagnóstico de adenomas hipofisarios y crear un registro computarizado para mejorar las estrategias de diagnóstico y seguimiento de estos pacientes. Metodología: Se realizó un análisis retrospectivo, descriptivo, de 102 historias clínicas sobre un total de 191 pacientes que concurrieron al servicio de endocrinología desde el año 2003 al 2014 . Las variables fueron analizadas mediante las correspondientes estadísticas descriptivas. Se utilizó el programa SPSS 11.5. Resultados: El 63% fueron mujeres, y el mayor porcentaje etario entre 25-60 años (74.4%). El 54% correspondió a adenomas no funcionantes, el 28% a prolactinomas, el 11.8% somatotropinomas y el 6.2% corticotropinomas. En todos los tipos el grupo femenino fue mayoritario, excepto en los no funcionantes. De los adenomas no funcionantes el 79% fueron macroadenomas, los prolactinomas el 52% fueron microadenomas y se realizó cirugía en el 37% de ellos. Los somatotropinomas, en el 80% fueron macroadenomas, se operó el 80% de los pacientes y radioterapia al 40%. En los corticotropinomas, tanto micro como macroadenomas se presentaron en igual porcentaje (50%) y todos ellos recibieron tratamiento quirúrgico. Conclusión: Los hallazgos coinciden con la literatura en cuanto a frecuencia y edad de presentación de los adenomas. Consideramos valioso la elaboración de un registro que nos permita optimizar el seguimiento y tratamiento de los pacientes, la investigación y divulgación científica.

  9. Hepatocellular carcinoma metastasis to the brain mimicking primary pituitary tumor around the sella turcica.

    Science.gov (United States)

    Tamura, Tetsuo; Kawamura, Yusuke; Ikeda, Kenji; Seko, Yuya; Fukushima, Taito; Kumada, Hiromitu; Yamada, Shozo; Matumaru, Yuji

    2013-08-01

    We report on two cases of hepatocellular carcinoma (HCC) with metastasis to the cavernous sinus and sphenoid sinus. Both cases presented with diplopia and retro-orbital headache and both underwent surgery for a primary pituitary gland tumor. After surgery, both cases were diagnosed with metastases from HCC. Case 1 was a 67-year-old male with a history of HCC who was referred to our hospital for pituitary tumor surgery. The tumor appeared to be in the sella turcica and to invade the sphenoid sinus and right cavernous sinus. Transnasal transsphenoidal surgery (TSS) was performed. The tumor was postoperatively diagnosed by histology to be a metastatic pituitary tumor from HCC. Radiotherapy was administered to the metastatic site. Case 2 was a 58-year-old male with a history of TSS for a pituitary tumor 16 years previously. He was referred to our hospital for TSS for a recurrent pituitary adenoma. TSS was performed twice in 3 months. During a preoperative general examination, HCC and chronic hepatitis B were revealed. TSS was performed initially, followed by arterial infusion chemotherapy. After TSS, the pituitary tumor was diagnosed by histology to be a metastasis from HCC. As with Case 1, radiotherapy was administered to the metastasis. Most tumors in the sella turcica are pituitary adenomas, although some cases of metastatic pituitary tumors and skull base metastases have been reported. Distant metastases generally have a poor prognosis; however, surgery to the metastatic site can effectively control symptoms caused by the metastatic tumor.

  10. Clinical and Biochemical Characteristics of Growth Hormone-Secreting Pituitary Tumors

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    To investigate the difference of biochemical characteristics on gsp-positive and gsp-negative growth hormone (GH)-secreting pituitary tumors, 18 GH-secreting pituitary tumors were examined for their clinical characteristics and gsp oncogenes. All patients received the pituitary function combinative stimulating test. It was found that there were no difference in the sex, age, tumor size, course of disease and plasma basal GH levels with gsp- positive and gsp-negative patients. The plasma levels of PRL were increased in most patients (11/18), and the plasma levels of TSH in gsp-positive patients were higher than those in gsp-negative patients (P<0.05). There was no significant difference in the responses to pituitary combinative stimulating test in gsp-positive and gsp-negative patients. It was concluded that there was little difference in the clinical biochemical characteristics of gsp-positive with gsp-negative GH-secreting pituitary tumors.

  11. Temozolomide treatment can improve overall survival in aggressive pituitary tumors and pituitary carcinomas.

    Science.gov (United States)

    Lasolle, Hélène; Cortet, Christine; Castinetti, Fréderic; Cloix, Lucie; Caron, Philippe; Delemer, Brigitte; Desailloud, Rachel; Jublanc, Christel; Lebrun-Frenay, Christine; Sadoul, Jean-Louis; Taillandier, Luc; Batisse-Lignier, Marie; Bonnet, Fabrice; Bourcigaux, Nathalie; Bresson, Damien; Chabre, Olivier; Chanson, Philippe; Garcia, Cyril; Haissaguerre, Magalie; Reznik, Yves; Borot, Sophie; Villa, Chiara; Vasiljevic, Alexandre; Gaillard, Stephan; Jouanneau, Emmanuel; Assié, Guillaume; Raverot, Gérald

    2017-06-01

    Only few retrospective studies have reported an efficacy rate of temozolomide (TMZ) in pituitary tumors (PT), all around 50%. However, the long-term survival of treated patients is rarely evaluated. We therefore aimed to describe the use of TMZ on PT in clinical practice and evaluate the long-term survival. Multicenter retrospective study by members of the French Society of Endocrinology. Forty-three patients (14 women) treated with TMZ between 2006 and 2016 were included. Most tumors were corticotroph (n = 23) or lactotroph (n = 13), and 14 were carcinomas. Clinical/pathological characteristics of PT, as well as data from treatment evaluation and from the last follow-up were recorded. A partial response was considered as a decrease in the maximal tumor diameter by more than 30% and/or in the hormonal rate by more than 50% at the end of treatment. The median treatment duration was 6.5 cycles (range 2-24), using a standard regimen for most and combined radiotherapy for six. Twenty-two patients (51.2%) were considered as responders. Silent tumor at diagnosis was associated with a poor response. The median follow-up after the end of treatment was 16 months (0-72). Overall survival was significantly higher among responders (P = 0.002); however, ten patients relapsed 5 months (0-57) after the end of TMZ treatment, five in whom TMZ was reinitiated without success. Patients in our series showed a 51.2% response rate to TMZ, with an improved survival among responders despite frequent relapses. Our study highlights the high variability and lack of standardization of treatment protocols. © 2017 European Society of Endocrinology.

  12. Transformation of a Silent Adrencorticotrophic Pituitary Tumor Into Central Nervous System Melanoma

    Directory of Open Access Journals (Sweden)

    Brandon A. Miller MD, PhD

    2013-06-01

    Full Text Available Silent adrenocorticotrophic pituitary adenomas are nonfunctioning pituitary adenomas that express adrenocorticotrophic hormone (ACTH but do not cause the clinical or laboratory features of hypercortisolemia. Primary central nervous system (CNS melanoma is well documented, but rarely originates in the sellar region or pituitary gland. Here we report transformation of an aggressive silent adrenocorticotrophic pituitary adenoma that transformed into CNS melanoma and review other presentations of pituitary melanoma. A 37-year-old woman initially presented with apoplexy and an invasive nonfunctioning pituitary macroadenoma for which she underwent transphenoidal surgery. The patient underwent 3 subsequent surgeries as the tumor continued to progress. Pathology from the first 3 operations showed pituitary adenoma or carcinoma. Pathology from the final surgery showed melanoma and the magnetic resonance imaging characteristics of the tumor had changed to become consistent with CNS melanoma. Dermatologic and ophthalmologic examinations did not identify cutaneous or ocular melanoma. The patient’s disease progressed despite aggressive surgical, medical and radiologic treatment. To our knowledge, this is the first report demonstrating transformation of a primary pituitary tumor into melanoma. The mechanism of tumor transformation is unclear, but it is possible that a mutation in the original ACTH-producing tumor lead to increased cleavage of pro-opiomelanocortin or ACTH into α-melanocyte-stimulating hormone, which in turn stimulated the expression of microopthalmia transcription factor, leading to melanocytic phenotype transformation.

  13. EXPRESSION OF EPIDERMAL GROWTH FACTOR, TRANSFORMING GROWTH FACTOR-a AND THEIR RECEPTOR IN HUMAN PITUITARY TUMORS

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    Objective: To explore the role of growth factor autocrine stimulation in the pathogenesis of human pituitary tumors. Methods: The expression of EGF, TGF-a and EGFR were studied by immunohisto-chemical method on paraffin-embedded sections of 30 cases pituitary tumor. Results: EGFR and its ligands EGF, TGF-a expressed in majority of pituitary tumors. The expression of EGFR and its ligands varied with cells' intensity, density and type. Conclusion: The EGF autocrine stimulating exerted in the pituitary tumor development process, that tyrosine kinases inhibitors may be useful for pituitary tumors treatment.

  14. RUNX1 and RUNX2 upregulate Galectin-3 expression in human pituitary tumors

    Science.gov (United States)

    Zhang, He-Yu; Jin, Long; Stilling, Gail A.; Ruebel, Katharina H.; Coonse, Kendra; Tanizaki, Yoshinori; Raz, Avraham

    2010-01-01

    Galectin-3 is expressed in a cell-type specific manner in human pituitary tumors and may have a role in pituitary tumor development. In this study, we hypothesized that Galectin-3 is regulated by RUNX proteins in pituitary tumors. Transcription factor prediction programs revealed several putative binding sites in the LGALS3 (Galectin-3 gene) promoter region. A human pituitary cell line HP75 was used as a model to study LGALS3 and RUNX interactions using Chromatin immunoprecipitation assay and electrophoresis mobility shift assay. Two binding sites for RUNX1 and one binding site for RUNX2 were identified in the LGALS3 promoter region. LGALS3 promoter was further cloned into a luciferase reporter, and the experiments showed that both RUNX1 and RUNX2 upregulated LGALS3. Knock-down of either RUNX1 or RUNX2 by siRNA resulted in a significant downregulation of Galectin-3 expression and decreased cell proliferation in the HP 75 cell line. Immunohistochemistry showed a close correlation between Galectin-3 expression and RUNX1/RUNX2 level in pituitary tumors. These results demonstrate a novel binding target for RUNX1 and RUNX2 proteins and suggest that Galectin-3 is regulated by RUNX1 and RUNX2 in human pituitary tumor cells by direct binding to the promoter region of LGALS3 and thus may contribute to pituitary tumor progression. PMID:19020999

  15. Early skin toxicity predicts better outcomes, and early tumor shrinkage predicts better response after cetuximab treatment in advanced colorectal cancer.

    Science.gov (United States)

    Kogawa, T; Doi, A; Shimokawa, M; Fouad, T M; Osuga, T; Tamura, F; Mizushima, T; Kimura, T; Abe, S; Ihara, H; Kukitsu, T; Sumiyoshi, T; Yoshizaki, N; Hirayama, M; Sasaki, T; Kawarada, Y; Kitashiro, S; Okushiba, S; Kondo, H; Tsuji, Y

    2015-03-01

    Cetuximab-containing treatments for metastatic colorectal cancer have been shown to have higher overall response rates and longer progression-free and overall survival than other systemic therapies. Cetuximab-related manifestations, including severe skin toxicity and early tumor shrinkage, have been shown to be predictors of response to cetuximab. We hypothesized that early skin toxicity is a predictor of response and better outcomes in patients with advanced colorectal carcinoma. We retrospectively evaluated 62 patients with colorectal adenocarcinoma who had unresectable tumors and were treated with cetuximab in our institution. Skin toxicity grade was evaluated on each treatment day. Tumor size was evaluated using computed tomography prior to treatment and 4-8 weeks after the start of treatment with cetuximab.Patients with early tumor shrinkage after starting treatment with cetuximab had a significantly higher overall response rate (P = 0.0001). Patients with early skin toxicity showed significantly longer overall survival (P = 0.0305), and patients with higher skin toxicity grades had longer progression-free survival (P = 0.0168).We have shown that early tumor shrinkage, early onset of skin toxicity, and high skin toxicity grade are predictors of treatment efficacy and/or outcome in patients with advanced colorectal carcinoma treated with cetuximab.

  16. Mechanisms for growth factor-induced pituitary tumor transforming gene-1 expression in pituitary folliculostellate TtT/GF cells.

    Science.gov (United States)

    Vlotides, G; Cruz-Soto, M; Rubinek, T; Eigler, T; Auernhammer, C J; Melmed, S

    2006-12-01

    PTTG1, a securin protein, also behaves as a transforming gene and is overexpressed in pituitary tumors. Because pituitary folliculostellate (FS) cells regulate pituitary tumor growth factors by paracrine mechanisms, epidermal growth factor (EGF) receptor (EGFR)-mediated PTTG1 expression and cell proliferation was tested in pituitary FS TtT/GF cells. EGFR ligands caused up to 3-fold induction of Pttg1 mRNA expression, enhanced proliferating cell nuclear antigen, and increased entry of G0/1-arrested cells into S-phase. PTTG binding factor mRNA expression was not altered. EGF-induced Pttg1 expression and cell proliferation was abolished by preincubation of TtT/GF cells with EGFR inhibitors AG1478 and gefitinib. Phosphatidylinositol 3 kinase, protein kinase C, and MAPK, but not c-Jun N-terminal kinase and Janus activating kinase signaling regulated EGF-induced Pttg1, as well as proliferating cell nuclear antigen mRNA expression and entry into S-phase. EGF-induced EGFR and ERK1/2 phosphorylation was followed by rapid MAPK kinase/ERK kinase-dependent activation of Elk-1 and c-Fos. EGF-induced Pttg1 expression peaked at the S-G2 transition and declined thereafter. Pttg1 cell cycle dependency was confirmed by suppression of EGF-induced Pttg1 mRNA by blockade of cells in early S-phase. The results show that PTTG1 and its binding protein PTTG binding factor are expressed in pituitary FS TtT/GF cells. EGFR ligands induce PTTG1 and regulate S-phase, mediated by phosphatidylinositol 3 kinase, protein kinase C, and MAPK pathways. PTTG1 is therefore a target for EGFR-mediated paracrine regulation of pituitary cell growth.

  17. Submental tracheal intubation for resection of recurrent giant pituitary tumor:a case report

    Institute of Scientific and Technical Information of China (English)

    Zhong Hejiang; Wang Yunling; Yang Tiande

    2011-01-01

    Airway management in the patients who receive transmaxillary approach for resection of giant pituitary tumor presents a clinical challenge to the anesthesiologists. Oral or nasal route for tracheal intubation can interfere with surgical procedures. This report describes submental tracheal intubation for airway management in a patient who underwent resection of recurrent giant pituitary tumor via transmaxillary approach. Submental tracheal intubation is an adaptable and safe alternative technology for airway management during operation.

  18. The role of temozolomide in the treatment of aggressive pituitary tumors.

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    Liu, James K; Patel, Jimmy; Eloy, Jean Anderson

    2015-06-01

    Pituitary tumors are amongst the most common intracranial neoplasms and are generally benign. However, some pituitary tumors exhibit clinically aggressive behavior that is characterized by tumor recurrence and continued progression despite repeated treatments with conventional surgical, radiation and medical therapies. More recently, temozolomide, a second generation oral alkylating agent, has shown therapeutic promise for aggressive pituitary adenomas and carcinomas with favorable clinical and radiographic responses. Temozolomide causes DNA damage by methylation of the O(6) position of guanine, which results in potent cytotoxic DNA adducts and consequently, tumor cell apoptosis. The degree of MGMT expression appears to be inversely related to therapeutic responsiveness to temozolomide with a significant number of temozolomide-sensitive pituitary tumors exhibiting low MGMT expression. The presence of high MGMT expression appears to mitigate the effectiveness of temozolomide and this has been used as a marker in several studies to predict the efficacy of temozolomide. Recent evidence also suggests that mutations in mismatch repair proteins such as MSH6 could render pituitary tumors resistant to temozolomide. In this article, the authors review the development of temozolomide, its biochemistry and interaction with O(6)-methylguanine-DNA methyltransferase (MGMT), its role in adjuvant treatment of aggressive pituitary neoplasms, and future works that could influence the efficacy of temozolomide therapy.

  19. Multicenter study on adult growth hormone level in postoperative pituitary tumor patients.

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    Cheng, Jing-min; Gu, Jian-wen; Kuang, Yong-qin; Ma, Yuan; Xia, Xun; Yang, Tao; Lu, Min; He, Wei-qi; Sun, Zhi-yong; Zhang, Yan-chao

    2015-03-01

    The objective of this study is to observe the adult growth hormone level in postoperative pituitary tumor patients of multi-centers, and explore the change of hypophyseal hormones in postoperative pituitary tumor patients. Sixty patients with pituitary tumor admitted during March, 2011-March, 2012 were selected. Postoperative hypophyseal hormone deficiency and the change of preoperative, intraoperative, and postoperative growth hormone levels were recorded. Growth hormone hypofunction was the most common hormonal hypofunction, which took up to 85.0 %. Adrenocortical hormone hypofunction was next to it and accounted for 58.33 %. GH + ACTH + TSH + Gn deficiency was the most common in postoperative hormone deficiency, which took up to 40.00 %, and GH + ACTH + TSH + Gn + AVP and GH deficiencies were next to it and accounted for 23.33 and 16.67 %, respectively. The hormone levels in patients after total pituitary tumor resection were significantly lower than those after partial pituitary tumor resection, and the difference was statistically significant; growth hormone and serum prolactin levels after surgery in two groups were decreased, and the difference was statistically significant. The incidence rate of growth hormone deficiency in postoperative pituitary tumor patients is high, which is usually complicated with deficiency of various hypophyseal hormones. In clinical, we should pay attention to the levels of the hypopnyseal hormones, and take timely measures to avoid postoperative complications.

  20. Acromegaly due to a Macroinvasive Plurihormonal Pituitary Adenoma and a Rectal Carcinoid Tumor

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    Sang Ouk Chin

    2015-09-01

    Full Text Available A macroinvasive pituitary adenoma with plurihormonality usually causes acromegaly and hyperprolactinemia, and also accompanies with neurologic symptoms such as visual disturbances. However, its concurrent presentation with a rectal carcinoid tumor is rarely observed. This study reports the history, biochemical, colonoscopic and immunohistochemical results of a 48-year-old female with acromegaly and hyperprolactinemia. Despite the large size and invasive nature of the pituitary adenoma to adjacent anatomical structures, she did not complain of any neurologic symptoms such as visual disturbance or headache. Immunohistochemical staining of the surgical specimen from the pituitary adenoma revealed that the tumor cells were positive for growth hormone (GH, prolactin (PRL, and thyroid stimulating hormone (TSH. Staining for pituitary-specific transcription factor-1 (Pit-1 was shown to be strongly positive, which could have been possibly contributing to the plurihormonality of this adenoma. Colonoscopy found a rectal polyp that was identified to be a carcinoid tumor using immunohistochemical staining. A macroinvasive pituitary adenoma with concomitant rectal carcinoid tumor was secreting GH, PRL, and TSH, which were believed to be in association with over-expression of Pit-1. This is the first case report of double primary tumors comprising a plurihormonal pituitary macroadenoma and rectal carcinoid tumor.

  1. Activating mutations of the Gs alpha-gene in nonfunctioning pituitary tumors.

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    Tordjman, K; Stern, N; Ouaknine, G; Yossiphov, Y; Razon, N; Nordenskjöld, M; Friedman, E

    1993-09-01

    The majority of pituitary tumors are of monoclonal origin; however, the molecular basis for their formation is poorly understood. Somatic mutations in the alpha-subunit of the GTP-binding protein, Gs alpha (gsp oncogene) have been found in about one third of GH-secreting tumors. Mutations in another alpha-subunit of a GTP-binding protein, Gi2 alpha (gip mutations) have been described in other endocrine tumors. In this study, we examined 21 nonfunctioning pituitary tumors and 4 macroprolactinomas for gsp mutations and 27 nonfunctioning tumors and 4 macroprolactinomas for gip mutations. Using the polymerase chain reaction and denaturing gradient gel electrophoresis, 2 nonfunctioning pituitary tumors displayed migration abnormalities when the Gs alpha-gene was analyzed. Sequence analysis of these abnormally migrating polymerase chain reaction products revealed two previously known gsp mutations: arginine at codon 201 altered to cysteine, and glutamine at codon 227 changed to leucine. No gip mutations could be demonstrated. These findings emphasize the monoclonal origin of nonfunctioning pituitary tumors and suggest that cAMP may play a role in tumorigenesis of nonfunctioning pituitary tumors.

  2. Resistance to dopamine agonists and somatostatin analogues in pituitary tumors: focus on cytoskeleton involvement

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    Erika ePeverelli

    2015-12-01

    Full Text Available Pituitary tumors, that origin from excessive proliferation of a specific subtype of pituitary cell, are mostly benign tumors, but may cause significant morbidity in affected patients, including visual and neurologic manifestations from mass-effect, or endocrine syndromes caused by hormone hypersecretion. Dopamine (DA receptor DRD2 and somatostatin (SS receptors (SSTRs represent the main targets of pharmacological treatment of pituitary tumors since they mediate inhibitory effects on both hormone secretion and cell proliferation, and their expression is retained by most of these tumors. Although long acting DA and SS analogs are currently used in the treatment of prolactin (PRL- and growth hormone (GH-secreting pituitary tumors, respectively, clinical practice indicates a great variability in the frequency and entity of favourable responses. The molecular basis of the pharmacological resistance are still poorly understood, and several potential molecular mechanisms have been proposed, including defective expression or genetic alterations of DRD2 and SSTRs, or an impaired signal transduction. Recently, a role for cytoskeleton protein filamin A (FLNA in DRD2 and SSTRs receptors expression and signalling in PRL- and GH- secreting tumors, respectively, has been demonstrated, first revealing a link between FLNA expression and responsiveness of pituitary tumors to pharmacological therapy. This review provides an overview of the known molecular events involved in SS and DA resistance, focusing on the role played by FLNA.

  3. Case Series Study of Visual Field Defects in Pituitary Gland Tumors

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    Vallabha K

    2017-01-01

    Full Text Available Background: The pituitary gland is a small endocrine gland, weighing about 500 mg. Pituitary adenomas account for 12-15 % of all intracranial tumors. Pituitary gland is in the sella turcica, 8-13 mm lower than the optic chiasm. Therefore, when it increases, it can easily compress the optic nerve fibers in the chiasm. Micro adenomas can have a negligible effect on the visual system or on the function impairment when pituitary adenoma compresses the frontal part of optic nerve; impairments in visual fields, visual acuity, and color contrast sensitivity are possible. The long standing compression of the chiasm induces primary optic nerve atrophy, which directly impairs visual function. The prevalence of visual field defects in pituitary adenomas varies from 37 to 96% in different studies. Because of its anatomical relationship with optic chiasm, pituitary adenoma typically results in bitemporal hemianopia. However, according to the tumor size and optic chiasmal position, a variety of field defects can be produced by pituitary adenoma and the tumor size is a significant factor in the severity of Visual field defects. Aim: To study the proportion of patients with visual field defects in pituitary adenomas and to study the pattern of visual field defects in pituitary adenomas. Materials and Methods: 7 patients diagnosed with a pituitary adenoma underwent complete ophthalmic and Humphrey’s Perimetry 30-2 visual field test at Department of Ophthalmology, BLDEU’S Shri B M Patil Medical College Hospital, Vijayapura between January 2015 to December 2015. Results: Among the 7 cases in the study, 2 cases were of pituitary micro adenoma constituting 28.5% and the remaining cases (5 cases were pituitary macro adenoma, constituting 71.5%. Visual acuity of 6/6 - 6/12 were observed in 10 (71.4% out of total 14 eyes. Visual field defects were observed in all 6 cases (85.7%. Bilateral temporal hemianopia was observed in the majority (42.8% of cases with field

  4. Tumor shrinkage assessed by volumetric MRI in the long-term follow-up after stereotactic radiotherapy of meningiomas

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    Astner, Sabrina T.; Theodorou, Marilena; Dobrei-Ciuchendea, Mihaela; Kopp, Christine; Molls, Michael [Dept. of Radiotherapy and Radiooncology, Klinikum rechts der Isar, Technical Univ. of Munich (Germany); Auer, Florian [Dept. of Neuroradiology, Klinikum rechts der Isar, Technical Univ. of Munich (Germany); Grosu, Anca-Ligia [Dept. of Radiotherapy, Univ. Hospital Freiburg (Germany)

    2010-08-15

    Purpose: To evaluate tumor volume reduction in the follow-up of meningiomas after fractionated stereotactic radiotherapy (FSRT) or linac radiosurgery (RS) by using magnetic resonance imaging (MRI). Patients and Methods: In 59 patients with skull base meningiomas, gross tumor volume (GTV) was outlined on contrast-en-hanced MRI before and median 50 months (range 11-92 months) after stereotactic radiotherapy. MRI was performed as an axial three-dimensional gradient-echo T1-weighted sequence at 1.6 mm slice thickness without gap (3D-MRI). Results were compared to the reports of diagnostic findings. Results: Mean tumor size of all 59 meningiomas was 13.9 ml (0.8-62.9 ml) before treatment. There was shrinkage of the treated meningiomas in all but one patient. Within a median volumetric follow-up of 50 months (11-95 months), an absolute mean volume reduction of 4 ml (0-18 ml) was seen. The mean relative size reduction compared to the volume before radiotherapy was 27% (0-73%). Shrinkage measured by 3D-MRI was greater at longer time intervals after radiotherapy. The mean size reduction was 17%, 23%, and 30% (at < 24 months, 24-48 months, and 48-72 months). Conclusion: By using 3D-MRI in almost all patients undergoing radiotherapy of a meningioma, tumor shrinkage is detected. The data presented here demonstrate that volumetric assessment from 3D-MRI provides additional information to routinely used radiologic response measurements. After FSRT or RS, a mean size reduction of 25-45% can be expected within 4 years. (orig.)

  5. Targeting zebrafish and murine pituitary corticotroph tumors with a cyclin-dependent kinase (CDK) inhibitor

    Science.gov (United States)

    Liu, Ning-Ai; Jiang, Hong; Ben-Shlomo, Anat; Wawrowsky, Kolja; Fan, Xue-Mo; Lin, Shuo; Melmed, Shlomo

    2011-01-01

    Cushing disease caused by adrenocorticotropin (ACTH)-secreting pituitary adenomas leads to hypercortisolemia predisposing to diabetes, hypertension, osteoporosis, central obesity, cardiovascular morbidity, and increased mortality. There is no effective pituitary targeted pharmacotherapy for Cushing disease. Here, we generated germline transgenic zebrafish with overexpression of pituitary tumor transforming gene (PTTG/securin) targeted to the adenohypophyseal proopiomelanocortin (POMC) lineage, which recapitulated early features pathognomonic of corticotroph adenomas, including corticotroph expansion and partial glucocorticoid resistance. Adult Tg:Pomc-Pttg fish develop neoplastic coticotrophs and pituitary cyclin E up-regulation, as well as metabolic disturbances mimicking hypercortisolism caused by Cushing disease. Early development of corticotroph pathologies in Tg:Pomc-Pttg embryos facilitated drug testing in vivo. We identified a pharmacologic CDK2/cyclin E inhibitor, R-roscovitine (seliciclib; CYC202), which specifically reversed corticotroph expansion in live Tg:Pomc-Pttg embryos. We further validated that orally administered R-roscovitine suppresses ACTH and corticosterone levels, and also restrained tumor growth in a mouse model of ACTH-secreting pituitary adenomas. Molecular analyses in vitro and in vivo showed that R-roscovitine suppresses ACTH expression, induces corticotroph tumor cell senescence and cell cycle exit by up-regulating p27, p21 and p57, and downregulates cyclin E expression. The results suggest that use of selective CDK inhibitors could effectively target corticotroph tumor growth and hormone secretion. PMID:21536883

  6. Tumores hipofisarios en la tercera edad Pituitary tumors in the elderly

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    D Moncet

    2010-04-01

    grupo etario.World population has been growing and aging; and pituitary tumors prevalence among the elderly has also increased, summing up to 10-15% of all pituitary tumors. Thirty six elderly patients with pituitary tumors, 20 of them male, were evaluated restrospectively (average age 71 years, range 65-85. A non-functioning adenoma (NFA prevalence was reported in 64% of the cases, followed by acromegaly, prolactinoma and one each of Cushing´s disease, lymphocytic hypophysitis, craniopharyngioma, and Rathke's pouch cyst. Macroadenomas accounted for 89% of tumors and the most frequent presentation was through visual disorders symptoms followed by incidental finding and hormone hypersecretion. During biochemical evaluation, most patients presented different degrees of hypopituitarism, and patients with macroprolactinoma had PRL levels>800ng/ml. Twenty one patients (58% underwent surgery, while 9 underwent radiotherapy. During the 3.6 years follow-up, changes in adenoma size were reported in 3 patients who received no treatment (in 2 cases size increased, whereas in another it decreased. Medical treatment was indicated for those whose pathology persisted or as primary treatment if comorbilities prevented from performing a surgery. No pituitary function improvement was detected after surgery and the appearance of one or more deficiency was noticed in 62% of patients, though visual field did improve in 67%. Definitive diabetes insipidus as a complication was only detected in two patients, and a case of fistula and meningitis was observed. As a conclusion, we reported a NFA prevalence rate smaller than that reported in the world literature, though similar for the other pituitary tumors, and a higher rate of incidental presentation. No complications attributable to patients' age group were detected during surgery. For elderly patients who do not undergo surgery, clinical and imaging follow-up and/or medical treatment could be an option of choice.

  7. Analysis of internet-based patient education materials related to pituitary tumors.

    Science.gov (United States)

    Cherla, Deepa V; Sanghvi, Saurin; Agarwal, Nitin; Eloy, Jean Anderson; Couldwell, William T; Liu, James K

    2014-10-01

    The Internet has become a primary and ubiquitous information source for patient education material (PEM); however, the information provided may not be appropriate for the average patient to comprehend. Various national healthcare organizations have recommended that PEM be written at or below the sixth-grade level. The purpose of this study was to assess the readability of pituitary tumor-related PEMs available on the Internet. Fifty-one PEMs on pituitary tumors were downloaded from professional society and clinical practice websites. Analysis of readability was performed using 4 different readability indices: Flesch-Kincaid Grade Level (FKGL), Flesch Reading Ease Score (FRES), Simple Measure of Gobbledygook (SMOG), and Gunning Frequency Measure of Gobbledygook (Gunning FOG). Scores from the FKGL, SMOG, and Gunning FOG scales correspond to reading grade levels. Therefore, a higher number corresponds to higher difficulty and lower readability. The average grade level of the PEMs according to the readability indices were as follows: FKGL = 11.71 (11th to 12th grades), SMOG = 14.56 (college level), and Gunning FOG = 14.86 (college level). For the FRES, higher scores imply easier readability. The average FRES was 40.19 (fairly difficult-between 10th and 11th grades). These findings suggest that online pituitary tumor-related material may be too difficult for comprehension by the majority of the targeted patient population. Keeping the reading level of PEMs at or below the sixth grade may improve understanding of this disease and its management for pituitary tumor patients.

  8. Complications Following Primary and Revision Transsphenoidal Surgeries for Pituitary Tumors

    Science.gov (United States)

    Krings, James G.; Kallogjeri, Dorina; Wineland, Andre; Nepple, Kenneth G.; Piccirillo, Jay F.; Getz, Anne E.

    2014-01-01

    Objective This study aimed to determine the incidence of major complications following both primary and revision transsphenoidal pituitary surgery. Major complications included endocrinopathic, skull base, orbital, hemorrhagic and thromboembolic complications, respiratory failure, and death. Secondarily, this study aimed to examine factors associated with the occurrence of complications. Study Design Retrospective cohort analysis of California and Florida all-payer databases from 2005-2008. Methods The major complication rate following both primary and revision transsphenoidal pituitary surgery was calculated. Bivariate analyses were performed to investigate the relationship of patient characteristics with complication occurrence, and a multivariate model was constructed to determine risk factors associated with these complications. Results 5,277 primary cases and 192 revision cases met inclusion criteria. There was a non-significant absolute difference of 3.09% (95% CI −11.00 to 16.14) between the rate of complications following primary (n=443; 8.39%) and revision (n=22; 11.46%) surgeries. Multivariate analyses showed that patients with Medicare (OR=1.74; 95% CI 1.17 to 2.61), Medicaid (OR=2.13; 95% CI 1.59 to 2.86), or a malignant neoplasm (OR=3.10; 95% CI 1.62 to 5.93) were more likely to have complications. Conclusions The rate of major complications following transsphenoidal pituitary surgery is lower than earlier retrospective reports. The overall complication rate following revision surgery was not significantly different from primary surgery. Insurance status and a diagnosis of a malignant neoplasm were associated with a higher rate of complications. PMID:25263939

  9. Adenoid Cystic Carcinoma Metastatic to the Pituitary: A Case Report and Discussion of Potential Diagnostic Value of Magnetic Resonance Elastography in Pituitary Tumors.

    Science.gov (United States)

    D Hughes, Joshua; Retzlaff, Amber; Sims, John; O'Brien, Erin; Giannini, Caterina; Huston, John; Van Gompel, Jamie J

    2016-07-01

    Adenoid cystic carcinoma (ACC) is an exocrine gland tumor accounting for approximately 10%-15% of all epithelial salivary neoplasms and occurs most often in the parotid and submandibular glands. Metastatic pituitary tumors are rare, and there is only 1 previously reported case of parotid ACC metastatic to the pituitary. Magnetic resonance elastography (MRE) is a dynamic magnetic resonance imaging (MRI)-based technique that measures the propagation of mechanically induced shear waves through a particular tissue to determine stiffness and offers a method to evaluate tissue consistency. We present the case of a 72-year-old woman with a remote history of parotid gland ACC and subsequent lung metastases presented after a fall that resulted in facial trauma. A non-contrast head computed tomography scan revealed a sellar/suprasellar mass, and follow-up MRI revealed a well-defined, enhancing 3.8-cm lesion. MRE showed the tumor to be firm. The tumor was resected through a transsphenoidal approach and was consistent with the MRE findings. Pathology returned as metastatic ACC. We report the second case of ACC metastatic to pituitary and the first firm pituitary tumor found by MRE and discuss the potential diagnostic value of MRE in pituitary lesions.

  10. Aggressive and malignant prolactin pituitary tumors: pathological diagnosis and patient management.

    Science.gov (United States)

    Zemmoura, Ilyess; Wierinckx, Anne; Vasiljevic, Alexandre; Jan, Michel; Trouillas, Jacqueline; François, Patrick

    2013-12-01

    According to the World Health Organization classification of pituitary tumors, only tumors with systemic metastasis must be considered as carcinomas. Invasive tumors with multiple recurrences are only classified as aggressive tumors or "atypical adenomas". To illustrate the problems encountered in the pathological diagnosis of pituitary carcinoma and in patient management, we present two male patients operated on for an aggressive prolactin pituitary adenoma with and without metastasis. In case 1, 5 surgeries, 3 irradiations, increased doses of dopamine agonists, and trials of temozolomide and carboplatine-VP16 failed to control tumor progression and the appearance of metastases which lead to death 16 years after onset. In case 2, based on the initial diagnosis of an aggressive-invasive adenoma that was resistant to dopamine agonists, gamma-Knife irradiation was initially performed on the intra-cavernous remnant. Eight years after onset, the remnant remained stabilized and the plasma PRL normalized under dopamine agonist. From these 2 cases alongside other cases found in the literature, we propose that the association of certain clinical signs (male sex, dopamine-resistant hyperprolactinemia), radiological signs (invasive macro or giant tumor on MRI) and histological signs (angiogenesis, Ki-67 > 3%, p53 positive, mitoses >2 per high power field, vascular invasion, up-regulation of genes related to invasion and proliferation, and allelic loss of chromosome 11) might suggest aggressiveness and be suspicious of malignancy before the appearance of metastasis. The early detection of an aggressive phenotype of a prolactin pituitary tumor should permit the earlier establishment of the optimum therapeutic strategy associating surgery and radiotherapy to delay or inhibit metastasis.

  11. Pituitary tumor with gigantism, acromegaly and preclinical Cushing's disease diagnosed from the 10th row.

    Science.gov (United States)

    Tourtelot, John B; Vesely, David L

    2013-08-01

    A 7'3" basketball player was noted to have 2 to 3 times thicker tissue in his hands than 6'10" players by an endocrinologist sitting 10 rows above the player in a basketball arena. This led to the diagnosis of pituitary gigantism where the history revealed that he was 7'3" at 15 years of age. At age 19 when the acryl enlargement was noted, a diagnostic workup revealed elevated growth hormones and insulin-like growth factor 1 (IGF-1) with a 2 × 1.3 cm pituitary tumor. His history suggested that his epiphyseal plates had closed at age 15, and because he continued to produce IGF-1, he now has acromegaly. His elevated adrenocorticotropic hormone (ACTH) before surgery suggests that he also had preclinical Cushing's disease. After pituitary transsphenoidal surgery, all acryl enlargement in hands and ligaments disappeared. His growth hormone, IGF-1 and ACTH returned to normal 2 weeks after surgery.

  12. [Trans-septal endoscopic approach of pituitary tumors].

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    Muñoz del Castillo, F; Jurado Ramos, A; De la Riva Aguilar, A; López Villarejo, P

    2003-10-01

    The advances in endoscopic instruments have eased the approach to the sellar region through the nasal cavity. We carry out an analysis of the surgical results on 20 patients that underwent surgery for sellar tumours through a transeptal-transphenoidal approach in the last 2 years in our hospital. The average was 45.6 years old, and 75% were females. 30% of cases were pituitary adenomas and another 30% acromegaly, 25% Cushing's disease and 10% prolactinomas. No complications were encountered during surgery being the most common postoperative complications, diabetes insipida in two cases (10%) and CSF leak in one case. At present 2 patients are having hormonal treatment for panhypopituitarism. No patients developed a septal perforation, nasal deformity, epistaxis, meningitis, lip numbness or oronasal fistula. The rest did have good results noith no recurrence and hormonal values back to normal.

  13. Antiapoptotic factor humanin is expressed in normal and tumoral pituitary cells and protects them from TNF-α-induced apoptosis.

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    María Florencia Gottardo

    Full Text Available Humanin (HN is a 24-amino acid peptide with cytoprotective action in several cell types such as neurons and testicular germ cells. Rattin (HNr, a homologous peptide of HN expressed in several adult rat tissues, also has antiapoptotic action. In the present work, we demonstrated by immunocytochemical analysis and flow cytometry the expression of HNr in the anterior pituitary of female and male adult rats as well as in pituitary tumor GH3 cells. HNr was localized in lactotropes and somatotropes. The expression of HNr was lower in females than in males, and was inhibited by estrogens in pituitary cells from both ovariectomized female and orquidectomized male rats. However, the expression of HNr in pituitary tumor cells was not regulated by estrogens. We also evaluated HN action on the proapoptotic effect of TNF-α in anterior pituitary cells assessed by the TUNEL method. HN (0.5 µM per se did not modify basal apoptosis of anterior pituitary cells but completely blocked the proapoptotic effect of TNF-α in total anterior pituitary cells, lactotropes and somatotropes from both female and male rats [corrected]. Also, HN inhibited the apoptotic effect of TNF-α on pituitary tumor cells. In summary, our results demonstrate that HNr is present in the anterior pituitary gland, its expression showing sexual dimorphism, which suggests that gonadal steroids may be involved in the regulation of HNr expression in this gland. Antiapoptotic action of HN in anterior pituitary cells suggests that this peptide could be involved in the homeostasis of this gland. HNr is present and functional in GH3 cells, but it lacks regulation by estrogens, suggesting that HN could participate in the pathogenesis of pituitary tumors.

  14. Pituitary tumor disappearance in a patient with newly diagnosed acromegaly primarily treated with octreotide LAR.

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    Resmini, E; Murialdo, G; Giusti, M; Boschetti, M; Minuto, F; Ferone, D

    2005-02-01

    We describe the case of an acromegalic patient primarily treated with octreotide LAR in whom the pituitary tumor disappeared after 18 months of treatment. A 68-yr-old woman, with clinical suspicion of acromegaly, was admitted to our Unit with the ultrasonographical evidence of cardiac hypertrophy, arrhythmias, right branch block and interatrial septum aneurism. She referred hands and feet enlargement since the age of 30 and facial disfigurements since the age of 50. At the age of 45 she underwent surgery for carpal tunnel syndrome and at the age of 61 an euthyroid nodular goiter was diagnosed. Hormonal evaluation showed elevated circulating GH levels (25+/-3.2 ng/ml), not suppressible after oral glucose load, and elevated IGF-I levels (646 ng/ml), whereas the remaining pituitary function was normal. Visual perimetry was normal, whereas magnetic resonance imaging (MRI) showed an intrasellar pituitary adenoma with maximal diameter of 9 mm. In order to improve cardiovascular function before surgery, the patient started octreotide LAR 20 mg every 4 weeks for 3 months. Then based on IGF-I values, the dose was adjusted to 30 mg. After 6 months a second MRI showed significant tumor reduction (>50% of baseline maximal diameter), GH and IGF-I were within the normal range and the patient continued the treatment. After one-year therapy, an improvement of cardiac alterations was recorded and the patient was referred to the neurosurgeon. However, she refused the operation. At 18-month follow-up, MRI showed the complete disappearance of direct and indirect signs of pituitary adenoma. To our knowledge, this is the first case of complete radiological remission of pituitary tumor during octreotide LAR treatment in acromegaly.

  15. Rab18 is reduced in pituitary tumors causing acromegaly and its overexpression reverts growth hormone hypersecretion.

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    Vazquez-Martinez, Rafael; Martinez-Fuentes, Antonio J; Pulido, Marina R; Jimenez-Reina, Luis; Quintero, Ana; Leal-Cerro, Alfonso; Soto, Alfonso; Webb, Susan M; Sucunza, Nuria; Bartumeus, Frederic; Benito-Lopez, Pedro; Galvez-Moreno, Maria A; Castaño, Justo P; Malagon, Maria M

    2008-06-01

    Rab proteins regulate the sequential steps of intracellular membrane transport. Alterations of these GTPases and their associated proteins are emerging as the underlying cause for several human diseases involving dysregulated secretory activities. Herein we investigated the role of Rab18, which negatively regulates hormone secretion by interacting with secretory granules, in relation to the altered functioning of tumoral pituitary somatotropes causing acromegaly. A total of 18 patients diagnosed with pituitary tumors causing acromegaly (nine patients) or nonfunctioning adenomas (nine patients) underwent endoscopic transsphenoidal surgery. Adenomas were subsequently processed to evaluate Rab18 production in relation to GH secretion. We found that somatotropinoma cells are characterized by a high secretory activity concomitantly with a remarkably reduced Rab18 expression (15%) and protein content levels (30%), as compared with cells from nonfunctioning pituitary adenomas derived from patients with normal or reduced GH plasma levels (100%). Furthermore, immunoelectron microscopy revealed that Rab18 association with the surface of GH-containing secretory granules was significantly lower in somatotropes from acromegalies than nonfunctioning pituitary adenomas. Finally, we provide evidence that modulation of Rab18 gene expression can revert substantially the hypersecretory activity of cells because Rab18 overexpression reduced by 40% the capacity of cells from acromegalies to respond to GHRH stimulation. These results suggest that molecular alterations affecting individual components of the secretory granule traffic machinery can contribute to maintain a high level of GH in plasma. Accordingly, Rab18 constitutes a valuable target as a diagnostic, prognostic, and/or therapeutic tool for human acromegaly.

  16. Components of the canonical and non-canonical Wnt pathways are not mis-expressed in pituitary tumors.

    Directory of Open Access Journals (Sweden)

    Leandro Machado Colli

    Full Text Available INTRODUCTION: Canonical and non-canonical Wnt pathways are involved in the genesis of multiple tumors; however, their role in pituitary tumorigenesis is mostly unknown. OBJECTIVE: This study evaluated gene and protein expression of Wnt pathways in pituitary tumors and whether these expression correlate to clinical outcome. MATERIALS AND METHODS: Genes of the WNT canonical pathway: activating ligands (WNT11, WNT4, WNT5A, binding inhibitors (DKK3, sFRP1, β-catenin (CTNNB1, β-catenin degradation complex (APC, AXIN1, GSK3β, inhibitor of β-catenin degradation complex (AKT1, sequester of β-catenin (CDH1, pathway effectors (TCF7, MAPK8, NFAT5, pathway mediators (DVL-1, DVL-2, DVL-3, PRICKLE, VANGL1, target genes (MYB, MYC, WISP2, SPRY1, TP53, CCND1; calcium dependent pathway (PLCB1, CAMK2A, PRKCA, CHP; and planar cell polarity pathway (PTK7, DAAM1, RHOA were evaluated by QPCR, in 19 GH-, 18 ACTH-secreting, 21 non-secreting (NS pituitary tumors, and 5 normal pituitaries. Also, the main effectors of canonical (β-catenin, planar cell polarity (JNK, and calcium dependent (NFAT5 Wnt pathways were evaluated by immunohistochemistry. RESULTS: There are no differences in gene expression of canonical and non-canonical Wnt pathways between all studied subtypes of pituitary tumors and normal pituitaries, except for WISP2, which was over-expressed in ACTH-secreting tumors compared to normal pituitaries (4.8x; p = 0.02, NS pituitary tumors (7.7x; p = 0.004 and GH-secreting tumors (5.0x; p = 0.05. β-catenin, NFAT5 and JNK proteins showed no expression in normal pituitaries and in any of the pituitary tumor subtypes. Furthermore, no association of the studied gene or protein expression was observed with tumor size, recurrence, and progressive disease. The hierarchical clustering showed a regular pattern of genes of the canonical and non-canonical Wnt pathways randomly distributed throughout the dendrogram. CONCLUSIONS: Our data reinforce previous reports

  17. Follow-up of patients with pituitary tumors before and after operation, medical treatment and radiotherapy

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    Gasser, R.W.; Finkenstedt, G.; Skrabal, F. (Innsbruck Univ. (Austria). Medizinische Klinik)

    1981-01-01

    From 1976 till 1981 56 patients with pituitary tumors were observed. From a total of 51 adenomas 17 prolactinomas (33.3%), 15 acromegalies (29.4%), 4 Cushing-syndromes (7.8%), 1 TSH-producing adenoma (1.9%) and 14 hormone-inactive adenomas (27.4%) were found. In addition, there were 4 craniopharyngeomas and 1 intrasellar meningeoma. For the individual types of adenomas prae- and postoperative hormonal data after transcranial resp. transsphenoidal adenomectomy are listed. Prolactinomas responded well to bromocriptine therapy in some cases, whereas acromegalies showed no remission after bromocriptine. After radiotherapy of 4 recidive-adenomas remission in one case was seen. Problems and objects of long-term-care of patients with pituitary tumors are discussed.

  18. Brain and Optic Chiasm Herniation into Sella after Pituitary Tumor Apoplexy

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    Maria M. Pineyro

    2017-08-01

    Full Text Available Brain and optic chiasm herniation has been rarely reported following dopamine agonist treatment for large prolactinomas. We report a case of brain and optical chiasm herniation, secondary to an empty sella due to apoplexy of a prolactinoma, and we focus on the specific presentation of this case. A 32-year-old female presented to a neurologist complaining of headaches. Her past medical history was significant for acute vision loss in both eyes accompanied by right third nerve palsy when she was 16 years old. She does not recall any endocrine or imaging evaluation at that time and she had spontaneous partial recovery of left eye vision within 3 months, with permanent blindness of right eye. She did not return to any follow-up until her neurologist consultation. Brain magnetic resonance imaging (MRI revealed herniation of frontal lobe and optic chiasm into the pituitary sella, as well as a pituitary hypointense lesion measuring 5 mm × 5 mm after gadolinium injection. Prolactin levels were 206 ng/ml (4.79–23.3 ng/ml. Repeated prolactin was 258 ng/ml (4.79–23.3 ng/ml. She was started on bromocriptine 2.5 mg/day. Prolactin levels and menstrual cycles normalized. A repeat brain MRI performed 5 months later showed disappearance of pituitary mass, with no changes in brain and chiasmal herniation. To our knowledge, this is the first reported case of brain associated with chiasm herniation secondary to pituitary apoplexy of a prolactinoma. In conclusion, this case highlights that frontal lobe herniation in combination with optic chiasm herniation can be a complication of pituitary tumor apoplexy. Long-term surveillance of patients with pituitary apoplexy is warranted to detect delayed complications.

  19. Testosterone Replacement and Bone Mineral Density in Male Pituitary Tumor Patients

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    Min Jeong Lee

    2014-03-01

    Full Text Available BackgroundHypopituitarism is associated with osteoporosis and osteopenia especially when hypogonadotropic hypogonadism is present. Despite hypopituitarism being an important cause of secondary osteoporosis, osteoporosis in patients receiving surgery for pituitary tumors in Korea has not been studied. In this study, we evaluated the effects of testosterone replacement therapy (TRT on bone mineral density (BMD in postoperative hypogonadal patients with pituitary tumors.MethodsTo examine the effect of TRT on BMD, we performed a retrospective observational study in 21 postoperative male patients who underwent pituitary tumor surgery between 2003 and 2012 at the Ajou University Hospital. Testosterone was replaced in postoperative hypogonadal patients by regular intramuscular injection, daily oral medication, or application of transdermal gel. BMD (g/cm2 measurements of central skeletal sites (lumbar spine, femoral neck, and total femur were obtained using dual-energy X-ray absorptiometry (GE Lunar. For lumbar spine BMD, L1 to L4 values were chosen for analysis. Femur neck and total femur were also analyzed.ResultsDuring the follow-up period (mean, 56 months; range, 12 to 99 months serum testosterone levels increased with the administration of TRT (P=0.007. There was significant improvement (4.56%±9.81% in the lumbar spine BMD compared to baseline BMD. There were no significant changes in the femur neck BMD or total femur BMD. We did not find any statistically significant relationships between changes in testosterone levels and BMD using Spearman correlation analysis.ConclusionOur results indicated that TRT used in the postoperative period for hypogonadal pituitary tumor surgery patients may have beneficial effects on the BMD of the spine.

  20. The effects of somatostatin analogue therapy on pituitary tumor volume in patients with acromegaly.

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    Colao, Annamaria; Auriemma, Renata S; Pivonello, Rosario

    2016-04-01

    In nearly all cases, acromegaly is caused by excess GH from a pituitary adenoma, resulting in elevated circulating levels of GH and, subsequently, IGF-1. Treatment goals are to eliminate morbidity and restore the increased mortality to normal rates. Therapeutic strategies aim to minimize tumor mass and normalize GH and IGF-1 levels. Somatostatin analogues are the medical treatment of choice in acromegaly, as first-line or post-surgical therapy, and have proven efficacy in pituitary tumor volume reduction (TVR). Here we review the effects of somatostatin analogue therapy on pituitary tumor volume in patients with acromegaly. TVR with somatostatin analogues may be mediated by direct anti-proliferative effects via activation of somatostatin receptors, or by indirect effects, such as angiogenesis inhibition, and is more pronounced when they are administered as first-line therapy. Various studies of first-line treatment with octreotide LAR have shown significant TVR in ≥73% of patients. First-line treatment with lanreotide Autogel has shown evidence of TVR, although more studies are needed. In a recent randomized, double-blind, 12-month trial in 358 medical-treatment-naïve acromegaly patients, significant TVR was achieved by 81% of patients administered pasireotide LAR and 77% administered octreotide LAR. Pre-operative somatostatin analogue therapy may also induce TVR and improve post-operative disease control compared with surgery alone. TVR is progressive with prolonged treatment, and decreased IGF-1 levels may be its best predictor, followed by age and degree of GH decrease. However, TVR does not always correlate with degree of biochemical control. Somatostatin analogues (first- or second-line treatment) are the mainstay of medical therapy and, as first-line medical therapy, are associated with significant pituitary TVR in most patients.

  1. Relation of early tumor shrinkage (ETS) observed in first-line treatment to efficacy parameters of subsequent treatment in FIRE-3 (AIOKRK0306).

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    Modest, Dominik P; Stintzing, Sebastian; Fischer von Weikersthal, Ludwig; Decker, Thomas; Kiani, Alexander; Vehling-Kaiser, Ursula; Al-Batran, Salah-Eddin; Heintges, Tobias; Lerchenmüller, Christian; Kahl, Christoph; Seipelt, Gernot; Kullmann, Frank; Scheithauer, Werner; Kirchner, Thomas; Jung, Andreas; Stauch, Martina; von Einem, Jobst Christian; Moehler, Markus; Held, Swantje; Heinemann, Volker

    2017-04-15

    We explored the association of early tumor shrinkage (ETS) and non-ETS with efficacy of first-line and consecutive second-line treatment in patients with KRAS wild-type metastatic colorectal cancer treated in FIRE-3. Assessment of tumor shrinkage was based on the sum of longest diameters of target lesions, evaluated after 6 weeks of treatment. Shrinkage was classified as ETS (shrinkage by ≥ 20%), mETS (shrinkage by 0 to 0 to ETS patients, while non-ETS was associated with less favorable outcome (mETS 24.0 (95% CI 21.2-26.9) months, mPD 19.0 (95% CI 13.0-25.0) months, PD 12.8 (95% CI 11.1-14.5) months). Differences in PFS of first-line therapy were less pronounced. ETS subgroups defined in first-line therapy also correlated with efficacy of second-line therapy. Progression-free survival in second-line (PFS2nd) was 6.5 months (5.8-7.2) for ETS, and was 5.6 (95% CI 4.7-6.5) months for mETS, 4.9 (95% CI 3.7-6.1) months for mPD and 3.3 (95% CI 2.3-4.3) months for PD. PFS of first-line and PFS2nd showed a linear correlation (Bravais-Pearson coefficient: 0.16, p = 0.006). While ETS is associated with the most favorable outcome, non-ETS represents a heterogeneous subgroup with distinct characteristics of less favorable initial tumor response to treatment. This is the first analysis to demonstrate that early tumor response observed during first-line FOLFIRI-based therapy may also relate to efficacy of second-line treatment. Early response parameters may serve as stratification factors in trials recruiting pretreated patients. © 2016 UICC.

  2. Temozolomide Therapy for Aggressive Pituitary Tumors: Results in a Small Series of Patients from Argentina

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    Oscar D. Bruno

    2015-01-01

    Full Text Available We evaluated results of temozolomide (TMZ therapy in six patients, aged 34–78 years, presenting aggressive pituitary tumors. In all the patients tested O6-methylguanine-DNA methyltransferase (MGMT immunoexpression in surgical specimens was absent. Patients received temozolomide 140–320 mg/day for 5 days monthly for at least 3 months. In two patients minimum time for evaluation could not be reached because of death in a 76-year-old man with a malignant prolactinoma and of severe neutro-thrombopenia in a 47-year-old woman with nonfunctioning pituitary adenoma. In two patients (a 34-year-old acromegalic woman and a 39-year-old woman with Nelson’s syndrome no response was observed after 4 and 6 months, respectively, and the treatment was stopped. Conversely, two 52- and 42-year-old women with Cushing’s disease had long-term total clinical and radiological remissions which persisted after stopping temozolomide. We conclude that TMZ therapy may be of variable efficacy depending on—until now—incompletely understood factors. Cooperative work on a greater number of cases of aggressive pituitary tumors should be crucial to establish the indications, doses, and duration of temozolomide administration.

  3. GROWTH HORMONE-, ALPHA-SUBUNIT AND THYROTROPIN-COSECRETING PITUITARY-ADENOMA IN FAMILIAL SETTING OF PITUITARY-TUMOR

    NARCIS (Netherlands)

    LINKS, TP; MONKELBAAN, JF; DULLAART, RPF; VANHAEFTEN, TW

    1993-01-01

    A patient with acromegaly and hyperthyroidism due to a growth hormone-, thyrotrophin- and alpha-subunit-secreting pituitary adenoma is described. His deceased father had suffered from a pituitary tumour, and was likely to have had acromegaly as well. Plasma growth hormone and insulin-like growth fac

  4. Pituitary tumor-transforming gene and its binding factor in endocrine cancer.

    Science.gov (United States)

    Smith, Vicki E; Franklyn, Jayne A; McCabe, Christopher J

    2010-12-03

    The pituitary tumor-transforming gene (PTTG1) encodes a multifunctional protein (PTTG) that is overexpressed in numerous tumours, including pituitary, thyroid, breast and ovarian carcinomas. PTTG induces cellular transformation in vitro and tumourigenesis in vivo, and several mechanisms by which PTTG contributes to tumourigenesis have been investigated. Also known as the human securin, PTTG is involved in cell cycle regulation, controlling the segregation of sister chromatids during mitosis. This review outlines current information regarding PTTG structure, expression, regulation and function in the pathogenesis of neoplasia. Recent progress concerning the use of PTTG as a prognostic marker or therapeutic target will be considered. In addition, the PTTG binding factor (PBF), identified through its interaction with PTTG, has also been established as a proto-oncogene that is upregulated in several cancers. Current knowledge regarding PBF is outlined and its role both independently and alongside PTTG in endocrine and related cancers is discussed.

  5. MR IMAGING ASSESSMENT OF IRREGULAR SHRINKAGE OF TUMOR MORPHOLOGY AND VOLUME IN CERVICAL CANCER DURING RADIATION THERAPY

    Institute of Scientific and Technical Information of China (English)

    LI Wen-bin李文彬; LI Ming-hua 李明华; CUI Xue-e 崔雪娥; William T. C. Yuh; Nina A. Mayr

    2004-01-01

    Objective: To study the clinical significance of the morphological and volume changes in cervical cancer during an ongoing course of radiation therapy (RT) using MR imaging. Methods: Serial MR imaging examinations were performed in 60 advanced cervical cancer patients. MR imaging was obtained at the start of RT, at 20-25 Gy (2-2.5 weeks of RT), at 45-50 Gy (4-5 weeks of RT), and 1-2 month post-RT. Tumor morphology was classified qualitatively as well-defined (round/oval with a well-demarcated smooth margin) vs. lobulated vs. irregular and tumor volume was assessed in each serial MR examination independently by ROI volumetry and diameter volumetry. ROI volumetry was traced on the computer workstation with a trackball in each sagittal T2-weighted image and calculated by the summation of all tumor areas in each slice and multiplication by the slice profile. Diameter volumetry was to measure the largest three orthogonal tumor diameters in each orthogonal measurement plane and calculate as an ellipsoid formula (V=d1 x d2 x d3 x π/6). Serial tumor volume was compared between the two measurement methods. Results: The proportion of lobulated and irregular tumors increased early during RT and declined lately post-RT (68% pre-RT, 80% at 2-2.5 weeks of RT, 72% at 4-5 weeks of RT, 33% post-RT). Accordingly, ROI volumetry and diameter volumetry correlated well pre-RT (r1=0.89) and post-RT (r4=0.80), but poorly during RT (r2 = 0.17 at 2-2.5 weeks of RT, r3 = 0.69 at 4-5 weeks of RT). Conclusions: Cervical cancers regress in a non-uniform fashion during RT and undergo increasingly irregular shrinkage. Measurement with ROI volumetry techniques, which can optimally measure irregular volumes, provides better assessment of radiation response during treatment than diameter volumetry.

  6. Combined anterior pituitary function test using CRH, GRH, LH-RH, TRH and vasopressin in patients with non-functioning pituitary tumors.

    Science.gov (United States)

    Hashimoto, K; Makino, S; Hirasawa, R; Takao, T; Kageyama, J; Ogasa, T; Ota, Z

    1990-06-01

    We examined 8 normal subjects and 16 patients with non-functioning pituitary tumors with a combined anterior pituitary test to evaluate the clinical usefulness of the test. Diagnoses included 9 of chromophobe adenoma, 3 of craniopharyngioma, 2 of Rathke's cleft cyst, and 1 each of intrasellar cyst and tuberculum sella meningioma. All subjects received hypothalamic releasing hormones: 1 micrograms/kg corticotropin releasing hormone (CRH), 1 micrograms/kg growth hormone releasing hormone (GRH), 500 micrograms thyrotropin-releasing hormone (TRH), 100 micrograms luteinizing hormone releasing hormone (LH-RH), and a relatively small dose (5 mU/kg) of lysine vasopressin (LVP). In the normal subjects, the addition of LVP potentiated the secretion of adenocorticotropic hormone (ACTH) induced by CRH, but had no significant effect on the secretion of other anterior pituitary hormones. In the combined test with 5 releasing hormones, the plasma ACTH and cortisol responses were not impaired in the majority of the patients before pituitary surgery. Serum thyroid-stimulating hormone (TSH), prolactin (PRL) and follicle-stimulating hormone (FSH) responses were not impaired in 82%, 70% and 67% of the patients, respectively, while the serum LH and GH responses were impaired in 67% and 73% of the patients, respectively. Following pituitary surgery, responses of these hormones to combined testing were similarly impaired in more than 75% of the patients. These results indicate that plasma ACTH, cortisol and serum TSH responses are fairly good before pituitary surgery but are impaired significantly after surgery. No subjects experienced any serious adverse effects related to the testing. These results suggest that combined testing with hypothalamic hormones is a convenient and useful method for evaluating pituitary function.

  7. Combined anterior pituitary function test using CRH, GRH, LH-RH, TRH and vasopressin in patients with non-functioning pituitary tumors.

    Directory of Open Access Journals (Sweden)

    Hashimoto,Kozo

    1990-06-01

    Full Text Available We examined 8 normal subjects and 16 patients with non-functioning pituitary tumors with a combined anterior pituitary test to evaluate the clinical usefulness of the test. Diagnoses included 9 of chromophobe adenoma, 3 of craniopharyngioma, 2 of Rathke's cleft cyst, and 1 each of intrasellar cyst and tuberculum sella meningioma. All subjects received hypothalamic releasing hormones: 1 micrograms/kg corticotropin releasing hormone (CRH, 1 micrograms/kg growth hormone releasing hormone (GRH, 500 micrograms thyrotropin-releasing hormone (TRH, 100 micrograms luteinizing hormone releasing hormone (LH-RH, and a relatively small dose (5 mU/kg of lysine vasopressin (LVP. In the normal subjects, the addition of LVP potentiated the secretion of adenocorticotropic hormone (ACTH induced by CRH, but had no significant effect on the secretion of other anterior pituitary hormones. In the combined test with 5 releasing hormones, the plasma ACTH and cortisol responses were not impaired in the majority of the patients before pituitary surgery. Serum thyroid-stimulating hormone (TSH, prolactin (PRL and follicle-stimulating hormone (FSH responses were not impaired in 82%, 70% and 67% of the patients, respectively, while the serum LH and GH responses were impaired in 67% and 73% of the patients, respectively. Following pituitary surgery, responses of these hormones to combined testing were similarly impaired in more than 75% of the patients. These results indicate that plasma ACTH, cortisol and serum TSH responses are fairly good before pituitary surgery but are impaired significantly after surgery. No subjects experienced any serious adverse effects related to the testing. These results suggest that combined testing with hypothalamic hormones is a convenient and useful method for evaluating pituitary function.

  8. Luteinizing hormone (LH) and prolactin-releasing pituitary tumor: possible malignant transformation of the LH cell line.

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    Spertini, F; Deruaz, J P; Perentes, E; Pelet, B; Gomez, F

    1986-05-01

    A pituitary tumor was diagnosed in a prepubertal 13-yr-old girl, who had elevated plasma LH (58 mIU/ml) and PRL (93 ng/ml) levels; decreased GH, ACTH, and FSH secretion; and diabetes insipidus. After surgery, plasma LH and PRL declined, but not to normal levels. Conventional external radiotherapy to the pituitary was immediately followed by a decrease in LH to prepubertal values (0.7 mIU/ml), while PRL levels became normal only after a long course of bromocriptine therapy. The pituitary tumor was composed of two distinct cell types: small polygonal cells, which were PRL positive by immunohistochemistry, and clusters of pleomorphic large frequently mitotic polynucleated cells, which were LH positive, some of them also being positive for the alpha-subunit or beta LH but not for beta FSH. Four years after surgery and radiotherapy, the patient deteriorated neurologically. Computed tomographic scan showed widespread frontal and periventricular tumor, which had the histological features of a poorly differentiated carcinoma. No PRL, LH, or alpha- or beta-subunits were detectable on immunocytochemistry. While the PRL-positive cells of the pituitary tumor displayed the histological and clinical features of PRL adenomas, the morphological characteristics of LH cells and the sharp decline of plasma LH levels after radiotherapy were suggestive of malignant transformation. In this context, the later brain tumor could have been the result of subependymal spread of the pituitary tumor after it lost its hormone-secreting capacity.

  9. Clinical results of tumor shrinkage and evaluation of quality of life in low rectal carcinoma after preoperative combined treatment

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    Kojima, Osamu; Suganuma, Yasushi; Tamura, Takao; Ohnishi, Kazuyoshi; Nishiue, Takashi; Itoh, Masahiko; Horie, Hiroshi; Sawai, Seiji; Takahashi, Toshio (Kyoto Prefectural Univ. of Medicine (Japan))

    1992-10-01

    To improve the surgical rate and the quality of life (QOL) for patients with advanced low rectal carcinoma, we investigated whether preoperative treatments (irradiation and hyperthermia and 5-fluorouracil (5-FU) suppository, irradiation and hyperthermia, irradiation and 5-FU suppository, irradiation alone and 5-FU suppository alone) were useful. The tumor shrinkage rate after preoperative treatments was highest in the irradiation, hyperthermia and 5-FU suppository group. Pathologically complete regression was observed in the 2 of 18 cases (12%). According to our criteria of histological changes, the irradiation, hyperthermia and 5-FU suppository group showed the greatest effectiveness. The 4 year postoperative survival rate and the 4 year local recurrence rate were 100% and 8% in the irradiation, hyperthermia and 5-FU suppository group and the data suggest that these results were the best of the 5 treatments. After the carcinoma was shrunk after irradiation, hyperthermia and 5-FU suppository, the patients could receive curatively a sphincter-saving operation (super-low anterior resection and transanal rectal resection). The fecal continence of 7 patients after sphincter-saving operations was increased as good by manometric study, defecography and clinical evaluation. In conclusion, our data suggest that the preoperative combined treatment of irradiation, hyperthermia and 5-FU suppository prevents local recurrence and increases the possibility of a sphincter-saving operation for advanced rectal carcinoma. (author).

  10. Sellar collision tumor involving metastatic lung cancer and pituitary adenoma: radiologic-pathologic correlation and review of the literature.

    Science.gov (United States)

    Sogani, Julie; Yang, Wanhua; Lavi, Ehud; Zimmerman, Robert D; Gupta, Ajay

    2014-01-01

    Collision tumors of the sella turcica involving metastases to pituitary adenomas are rare. We report a case of a collision tumor involving metastatic lung cancer with an emphasis on the neuroimaging and histopathological studies. A review of the literature including the diagnostic and management implications as well as pathogenetic mechanisms is also discussed.

  11. Assessment of Environmental and Hereditary Influence on Development of Pituitary Tumors Using Dermatoglyphic Traits and Their Potential as Screening Markers.

    Science.gov (United States)

    Gradiser, Marina; Matovinovic Osvatic, Martina; Dilber, Dario; Bilic-Curcic, Ines

    2016-03-17

    The aim of this study was to assess environmental and hereditary influence on development of pituitary tumors using dermatoglyphic traits. The study was performed on 126 patients of both genders with pituitary tumors (60 non-functional and 66 functional pituitary tumor patients) in comparison to the control group of 400 phenotypically healthy individuals. Statistical analysis of quantitative and qualitative traits of digito-palmar dermatoglyphics was performed, and hormonal status was determined according to the standard protocols. Although we did not find markers that could specifically distinguish functional from non-functional tumors, we have found markers predisposing to the development of tumors in general (a small number of ridges between triradius of both hands, a smaller number of ridges between the triradius of c-d rc R), those for endocrine dysfunction (increased number of arches and reduced number of whorls, difference of pattern distribution in the I3 and I4 interdigital space), and some that could potentially be attributed to patients suffering from pituitary tumors (small number of ridges for variables FRR 5, smaller number of ridges in the FRL 4 of both hands and difference of pattern distribution at thenar of I1 and I2 interdigital space). The usage of dermatoglyphic traits as markers of predisposition of pituitary tumor development could facilitate the earlier detection of patients in addition to standard methods, and possibly earlier treatment and higher survival rate. Finally, our results are consistent with the hypothesis about multifactorial nature of pituitary tumor etiology comprised of both gene instability and environmental factors.

  12. Differentiation of pituitary adenomas from other sellar and parasellar tumors by {sup 99m}Tc(V)-DMSA scintigraphy

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    Yamamura, Koji [Yokohama City Univ. (Japan). Medical Center; Suzuki, Shinichi; Yamamoto, Isao [Yokohama City Univ. (Japan). School of Medicine

    2003-04-01

    Pentavalent technetium-99m dimercaptosuccinic acid [{sup 99m}Tc(V)-DMSA] scintigraphy was evaluated for the differentiation of pituitary adenomas, especially non-functioning adenomas, from other sellar and parasellar lesions. Diffuse {sup 99m}Tc(V)-DMSA accumulation within the tumor was found in seven of seven non-functioning, three of four growth hormone-secreting, and seven of eight prolactin-secreting adenomas, but only partial accumulation in only two of 16 non-pituitary adenomas and normal pituitary glands. There were no significant relationship between tumor-to-background ratios and tumor size or serum hormone level. {sup 99m}Tc(V)-DMSA scintigraphy showed overall sensitivity of 81% (17/21 cases) for detecting pituitary adenomas, in particular 100% for non-functioning adenomas. {sup 99m}Tc(V)-DMSA may be useful for detecting pituitary adenomas, especially non-functioning adenomas, and for the differentiation of non-functioning pituitary adenomas from other sellar and parasellar lesions. (author)

  13. EXPRESSION OF EPIDERMAL GROWTH FACTOR, TRANSFORMING GROWTH FACTOR-a AND THEIR RECEPTOR IN HUMAN PITUITARY TUMORS

    Institute of Scientific and Technical Information of China (English)

    ZHANG; Long

    2001-01-01

    [1]LIU Xu-wen, FU Pei-yu, GAO Zhi-xian. Expression of epidermal growth factor receptors in human glioma [J]. Chin J Neurosurgery 1998; 14:71.[2]Wong AJ, Ruppert JM, Bigner SH, et al. Structural alterations of the epidermal growth factor receptor gene in human gliomas [J]. Proc Natl Acad Sci USA 1992; 89:4309.[3]Webster J, Ham J, Bevan JS. Preliminary characterization of growth factors secreted by human pituitary tumors [J]. J Clin Endocrinol Metab 1991; 72:687.[4]Klibanski A. Nonsecreting pituitary tumors [J]. Endocrinol Metab Clin North Am 1987; 16:793.[5]LeRiche VK, Asa SL, Ezzat S. Epidermal growth factor and its receptor (EGF-R) in human pituitary adenomas: EGF-R correlates with tumor aggressiveness [J]. J Clin Endocrinol Metab 1996; 81:656.

  14. The in vitro and in vivo effects of human growth hormone administration on tumor growth of rats bearing a transplantable rat pituitary tumor (7315b)

    NARCIS (Netherlands)

    A. Binnerts (Arjen); P. Uitterlinden (Piet); L.J. Hofland (Leo); P.M. van Koetsveld (Peter); S.W.J. Lamberts (Steven)

    1990-01-01

    markdownabstractAbstract The direct effects of human GH and IGF-I on PRL secretion and cell proliferation were studied on PRL secreting rat pituitary tumor 7315b cells in vitro, as well as the effects in vivo of human GH administration on body weight, IGF-I levels and tumor size in rats bearing th

  15. MRI Findings of Causalgia of the Lower Extremity Following Transsphenoidal Resection of Pituitary Tumor

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    D. Ryan Ormond

    2012-01-01

    Full Text Available Background. Causalgia is continuing pain, allodynia, or hyperalgesia after nerve injury with edema, changes in skin blood flow, or abnormal sudomotor activity. Here we report a case of lower extremity causalgia following elective transsphenoidal resection of a pituitary tumor in a young man. Clinical Presentation. A 33-year-old man with acromegaly underwent elective sublabial transsphenoidal resection of his pituitary tumor. During the three-hour surgery, the lower limbs were kept in a supine, neutral position with a pillow under the knees. The right thigh was slightly internally rotated with a tape to expose fascia lata, which was harvested to repair the sella. Postoperatively, he developed causalgia in a distal sciatic and common peroneal nerve distribution. Pain was refractory to several interventions. Finally, phenoxybenzamine improved his pain significantly. Conclusions. Malpositioning in the operating room resulted in causalgia in this young man. Phenoxybenzamine improved, and ultimately resolved, his symptoms. Improvement in his pain symptoms correlated with resolution of imaging changes in the distal sciatic and peroneal nerves on the side of injury.

  16. Fatal antiphospholipid syndrome following endoscopic transnasal-transsphenoidal surgery for a pituitary tumor

    Science.gov (United States)

    Li, Chiao-Zhu; Li, Chiao-Ching; Hsieh, Chih-Chuan; Lin, Meng-Chi; Hueng, Dueng-Yuan; Liu, Feng-Chen; Chen, Yuan-Hao

    2017-01-01

    Abstract Introduction: The fatal type of antiphospholipid syndrome is a rare but life-threating condition. It may be triggered by surgery or infection. Endoscopic transnasal-transsphenoidal surgery is a common procedure for pituitary tumor. We report a catastrophic case of a young woman died of fatal antiphospholipid syndrome following endoscopic transnasal-transsphenoidal surgery. Methods and Result: A 31-year-old woman of a history of stroke received endoscopic transnasal-transsphenoidal surgery for a pituitary tumor. The whole procedure was smooth. However, the patient suffered from acute delirium on postoperative day 4. Then, her consciousness became comatose state rapidly with dilatation of pupils. Urgent magnetic resonance imaging of brain demonstrated multiple acute lacunar infarcts. The positive antiphosphoipid antibody and severe thrombocytopenia were also noted. Fatal antiphospholipid syndrome was diagnosed. Plasma exchange, corticosteroids, anticoagulant agent were prescribed. The hemodynamic condition was gradually stable. However, the consciousness was still in deep coma. The patient died of organ donation 2 months later. Conclusion: If patients have a history of cerebral stroke in their early life, such as a young stroke, the APS and higher risk of developing fatal APS after major surgery should be considered. The optimal management of APS remains controversial. The best treatment strategies are only early diagnosis and aggressive therapies combing of anticoagulant, corticosteroid, and plasma exchange. The intravenous immunoglobulin is prescribed for patients with refractory APS. PMID:28072724

  17. The endonasal microscopic approach for pituitary adenomas and other parasellar tumors: a 10-year experience.

    Science.gov (United States)

    Fatemi, Nasrin; Dusick, Joshua R; de Paiva Neto, Manoel A; Kelly, Daniel F

    2008-10-01

    THE DIRECT ENDONASAL transsphenoidal approach to the sella with the operating microscope was initially described more than 20 years ago. Herein, we describe the technique, its evolution, and lessons learned over a 10-year period for treating pituitary adenomas and other parasellar pathology. From July 1998 to January 2008, 812 patients underwent a total of 881 operations for a pituitary adenoma (n = 605), Rathke's cleft cyst (n = 59), craniopharyngioma (n = 26), parasellar meningioma (n = 23), chordoma (n = 18), or other pathological condition (n = 81). Of these, 118 operations (13%) included an extended approach to the suprasellar, infrasellar/clival, or cavernous sinus regions. Endoscopic assistance was used in 163 cases (19%) overall, including 36% of the last 200 cases in the series and 18 (72%) of the last 25 extended endonasal cases. Surgical complications included 19 postoperative cerebrospinal fluid leaks (2%), 6 postoperative hematomas (0.7%), 4 carotid artery injuries (0.4%), 4 new permanent neurological deficits (0.4%), 3 cases of bacterial meningitis (0.3%), and 2 deaths (0.2%). The overall complication rate was higher in the first 500 cases in the series and in extended approach cases. Major technical modifications over the 10-year period included increased use of shorter (60-70 mm) endonasal speculums for greater instrument maneuverability and visualization, the micro-Doppler probe for cavernous carotid artery localization, endoscopy for more panoramic visualization, and a graded cerebrospinal fluid leak repair protocol. These changes appear to have collectively and incrementally made the approach safer and more effective. In summary, the endonasal approach provides a minimally invasive route for removal of pituitary adenomas and other parasellar tumors.

  18. Thyrotropin-secreting pituitary tumor presenting with congestive heart failure and good response to dopaminergic agonist cabergoline.

    Science.gov (United States)

    Kao, Yu-Hsi; Chang, Tien-Jyun; Huang, Tien-Shang

    2013-11-01

    Hyperthyroidism is an important inducing factor in patients with atrial fibrillation, and may trigger heart failure. Thyrotropin (thyroid stimulating hormone, TSH)-secreting pituitary tumors are rare causes of hyperthyroidism. Here, we report a 66-year-old man with a pituitary TSH-secreting tumor who presented with hyperthyroidism and congestive heart failure. Endonasal trans-sphenoidal pituitary adenomectomy was performed. After the operation, the symptoms of hyperthyroidism and congestive heart failure were relieved, associated with normalization of thyroid function tests. Unfortunately, hand tremor and progressively elevated free T4 and TSH concentrations recurred 5 months after surgery. A dopaminergic agonist, cabergoline was administered and euthyroidism was restored for at least 11 months.

  19. Thyrotropin-secreting pituitary tumor presenting with congestive heart failure and good response to dopaminergic agonist cabergoline

    Directory of Open Access Journals (Sweden)

    Yu-Hsi Kao

    2013-11-01

    Full Text Available Hyperthyroidism is an important inducing factor in patients with atrial fibrillation, and may trigger heart failure. Thyrotropin (thyroid stimulating hormone, TSH-secreting pituitary tumors are rare causes of hyperthyroidism. Here, we report a 66-year-old man with a pituitary TSH-secreting tumor who presented with hyperthyroidism and congestive heart failure. Endonasal trans-sphenoidal pituitary adenomectomy was performed. After the operation, the symptoms of hyperthyroidism and congestive heart failure were relieved, associated with normalization of thyroid function tests. Unfortunately, hand tremor and progressively elevated free T4 and TSH concentrations recurred 5 months after surgery. A dopaminergic agonist, cabergoline was administered and euthyroidism was restored for at least 11 months.

  20. Therapy for non-functional pituitary adenoma. Residual tumor and radiotherapy

    Energy Technology Data Exchange (ETDEWEB)

    Takahashi, Toshio; Ito, Satoshi; Shimamura, Norihito; Sekiya, Tetsuharu; Tanaka, Masahiko; Suzuki, Shigeharu [Hirosaki Univ., Aomori (Japan). School of Medicine

    1997-01-01

    Effects and complication of radiotherapy after surgery of non-functional pituitary adenoma were evaluated with consideration on findings in recent literatures. On 44 cases of 64 patients (36 males and 28 females), the mean age of 48.9y, with macroadenoma, a comparison was made on their recurrence and complication between irradiated and non-irradiated groups after surgery. The follow-up period was >1 year (5y4m in a mean). The total radiation dose was in the range of 40-60 (average 47.3) Gy. Recurrence was seen in 1/31 cases in irradiated group, and 5/13 in non-irradiated group. Reduction of visual acuity and hypopituitarism were observed in 1 and 2 cases, respectively, in irradiated group. Radiotherapy for residual tumor was confirmed useful for preventing recurrence. (K.H.)

  1. Mice lacking pituitary tumor transforming gene show elevated exposure of DGalNAc carbohydrate determinants

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    Lutsyk A. D.

    2012-04-01

    Full Text Available Aim. To investigate the influence of pituitary tumor transforming gene (pttg-1 knockout on glycome of parenchimal organs by means of lectin histochemistry. Methods. DGalNAc, DGlcNAc, NeuNAc carbohydrate determinants were labelled with soybean agglutinin (SBA and wheat germ agglutinin (WGA, conjugated to peroxidase, with subsequent visualization of the lectin-binding sites with diaminobenzidine. The testes and kidneys of murine strain BL6/C57 with the pttg-1 gene knockout (PTTG-KO were compared to the wild type (PTTG-WT animals, both groups 1 month of age. Results. Knockout of the pttg-1 gene was accompanied by enhanced exposure of the DGalNAc sugar residues within the Golgi complex of secondary spermatocytes, in a brush border of renal tubules and on the lumenal surface of collecting ducts. Conclusions. This study suggests that knockout of the pttg-1 gene may lead to the changes in carbohydrate processing in mammalian organism.

  2. Subchronic exposure to phytoestrogens alone and in combination with diethylstilbestrol - pituitary tumor induction in Fischer 344 rats

    Directory of Open Access Journals (Sweden)

    Kaphalia Bhupendra S

    2010-05-01

    Full Text Available Abstract Background Subchronic administration of the potent pharmaceutical estrogen diethylstilbestrol (DES to female Fischer 344 (F344 rats induces growth of large, hemorrhagic pituitaries that progress to tumors. Phytoestrogens (dietary plant estrogens are hypothesized to be potential tumor inhibitors in tissues prone to estrogen-induced cancers, and have been suggested as "safer" estrogen replacements. However, it is unknown if they might themselves establish or exacerbate the growth of estrogen-responsive cancers, such as in pituitary. Methods We implanted rats with silastic capsules containing 5 mg of four different phytoestrogens - either coumestrol, daidzein, genistein, or trans-resveratrol, in the presence or absence of DES. We examined pituitary and other organ weights, blood levels of prolactin (PRL and growth hormone (GH, body weights, and pituitary tissue histology. Results Blood level measurements of the administered phytoestrogens confirmed successful exposure of the animals to high levels of these compounds. By themselves, no phytoestrogen increased pituitary weights or serum PRL levels after 10 weeks of treatment. DES, genistein, and resveratrol increased GH levels during this time. Phytoestrogens neither changed any wet organ weight (uterus, ovary, cervix, liver, and kidney after 10 weeks of treatment, nor reversed the adverse effects of DES on pituitaries, GH and PRL levels, or body weight gain after 8 weeks of co-treatment. However, they did reverse the DES-induced weight increase on the ovary and cervix. Morphometric examination of pituitaries revealed that treatment with DES, either alone or in combination with phytoestrogens, caused gross structural changes that included decreases in tissue cell density, increases in vascularity, and multiple hemorrhagic areas. DES, especially in combination with phytoestrogens, caused the development of larger and more heterogeneous nuclear sizes in pituitary. Conclusions High levels of

  3. Membrane estrogen receptor-α-mediated nongenomic actions of phytoestrogens in GH3/B6/F10 pituitary tumor cells

    OpenAIRE

    Jeng, Yow-Jiun; Kochukov, Mikhail Y.; Watson, Cheryl S

    2009-01-01

    Background: Estradiol (E2) mediates various intracellular signaling cascades from the plasma membrane via several estrogen receptors (ERs). The pituitary is an estrogen-responsive tissue, and we have previously reported that E2 can activate mitogen-activated protein kinases (MAPKs) such as ERK1/2 and JNK1/2/3 in the membrane ERα (mERα)-enriched GH3/B6/F10 rat pituitary tumor cell line. Phytoestrogens are compounds found in plants and foods such as soybeans, alfalfa sprouts, and red grapes. Th...

  4. Repeat transsphenoidal surgery for the treatment of remaining or recurring pituitary tumors in acromegaly.

    Science.gov (United States)

    Yamada, Shozo; Fukuhara, Noriaki; Oyama, Kenichi; Takeshita, Akira; Takeuchi, Yasuharu

    2010-10-01

    Acromegaly is a disorder characterized by hypersecretion of growth hormone caused by a growth hormone-secreting pituitary adenoma. To evaluate the long-term efficacy and safety of repeat transsphenoidal surgery for persistent or recurrent acromegaly. We retrospectively reviewed records for 53 acromegalic patients who underwent repeat transsphenoidal surgery for persistent or progressive acromegaly at Toranomon Hospital between 1987 and 2006. Multivariate logistic regression was performed to evaluate preoperative factors influencing the surgical outcome. Thirty-one patients (58.5%) met the criteria for cure on long-term follow-up endocrine findings. Furthermore, 17 patients were well controlled with normal insulin-like growth factor I levels without (2 patients) or with medication (15 patients), whereas insulin-like growth factor I levels were still above normal in 5 patients after postoperative adjuvant therapy. Only 1 patient was undergoing additional hormonal replacement after surgery, although transient cerebrospinal fluid leak, transient abducens nerve palsy, severe nasal bleeding, and pituitary abscess occurred in each patient, respectively. Multivariate analysis clarified that a favorable surgical outcome was achieved in patients without cavernous sinus invasion (hazard ratio 12.56), tumor segmentation (hazard ratio 5.82), or in those older than 40 years old (hazard ratio 3.21). Repeat surgery can be performed safely with an approximately 60% long-term cure rate in this series. Reoperation should therefore be considered for persistent or recurrent disease in acromegalic patients in whom adjuvant therapy is not effective enough or cannot be accepted. The careful study of initial or preoperative magnetic resonance imaging and the use of micro-Doppler, endoscope, and eye movement monitoring device during surgery can help increase cure rate with a lower complication rate.

  5. Meta-analysis on the effects of octreotide on tumor mass in acromegaly.

    Directory of Open Access Journals (Sweden)

    Andrea Giustina

    Full Text Available BACKGROUND: The long-acting somatostatin analogue octreotide is used either as an adjuvant or primary therapy to lower growth hormone (GH levels in patients with acromegaly and may also induce pituitary tumor shrinkage. OBJECTIVE: We performed a meta-analysis to accurately assess the effect of octreotide on pituitary tumor shrinkage. DATA SOURCES: A computerized Medline and Embase search was undertaken to identify potentially eligible studies. STUDY ELIGIBILITY CRITERIA: Eligibility criteria included treatment with octreotide, availability of numerical metrics on tumor shrinkage and clear definition of a clinically relevant reduction in tumor size. Primary endpoints included the proportion of patients with tumor shrinkage and mean percentage reduction in tumor volume. DATA EXTRACTION AND ANALYSIS: The electronic search identified 2202 articles. Of these, 41 studies fulfilling the eligibility criteria were selected for data extraction and analysis. In total, 1685 patients were included, ranging from 6 to 189 patients per trial. For the analysis of the effect of octreotide on pituitary tumor shrinkage a random effect model was used to account for differences in both effect size and sampling error. RESULTS: Octreotide was shown to induce tumor shrinkage in 53.0% [95% CI: 45.0%-61.0%] of treated patients. In patients treated with the LAR formulation of octreotide, this increased to 66.0%, [95% CI: 57.0%-74.0%. In the nine studies in which tumor shrinkage was quantified, the overall weighted mean percentage reduction in tumor size was 37.4% [95% CI: 22.4%-52.4%], rising to 50.6% [95% CI: 42.7%-58.4%] with octreotide LAR. LIMITATIONS: Most trials examined were open-label and had no control group. CONCLUSIONS: Octreotide LAR induces clinically relevant tumor shrinkage in more than half of patients with acromegaly.

  6. Long-term follow-up results of combination therapy of surgery and gamma knife on pituitary tumor

    Energy Technology Data Exchange (ETDEWEB)

    Ikeda, Hidetoshi; Yoshimoto, Takashi; Shirokura, Hideshi [Tohoku Univ., Sendai (Japan). School of Medicine

    1997-01-01

    Usefulness of the combination therapy for invasive pituitary tumor with surgery and gamma knife (GK) was evaluated on 17 cases followed for >2 years. Tumors involved ACTH cell adenoma, GH cell adenoma, mixed GH and PRL, purihormonal adenoma, gonadotrophic cell adenoma, GH cell adenoma and null cell adenoma, which were divided into I and II group since adverse effects by GK on the normal pituitary tissues could be evaluated according to tumor growth and abnormal hormone secretion. Irradiation was carried out to make the marginal dose of around 30 (15-35) Gy and center dose of 25-70 Gy on the gland, and marginal dose of <10 Gy on optic nerve. After GK, follow-up was done by pituitary hormone values, tests for sight and visual field and MRI examination. Hypopituitarism was seen in 67% with 100% remission of Cushing`s disease. MRI revealed that the adenoma changed to fibrosis (type 1) with increasing Gd-enhancement or to cystic necrosis (type 2) without Gd-enhancement. Values for GH, cortisol and ACTH turned to normal ones. Thus the combination therapy was found useful. (K.H.)

  7. Regulation of pituitary tumor transforming gene (PTTG) expression and phosphorylation in thyroid cells.

    Science.gov (United States)

    Lewy, Gregory D; Ryan, Gavin A; Read, Martin L; Fong, Jim C W; Poole, Vikki; Seed, Robert I; Sharma, Neil; Smith, Vicki E; Kwan, Perkin P K; Stewart, Sarah L; Bacon, Andrea; Warfield, Adrian; Franklyn, Jayne A; McCabe, Christopher J; Boelaert, Kristien

    2013-11-01

    Human pituitary tumor transforming gene (hPTTG) is a multifunctional proto-oncogene implicated in the initiation and progression of several tumors. Phosphorylation of hPTTG is mediated by cyclin-dependent kinase 2 (CDC2), whereas cellular expression is regulated by specificity protein 1 (SP1). The mechanisms underlying hPTTG propagation of aberrant thyroid cell growth have not been fully defined. We set out to investigate the interplay between hPTTG and growth factors, as well as the effects of phosphorylation and SP1 regulation on hPTTG expression and function. In our study, epidermal growth factor (EGF), TGFα, and IGF-1 induced hPTTG expression and phosphorylation in thyroid cells, which was associated with activation of MAPK and phosphoinositide 3-kinase. Growth factors induced hPTTG independently of CDC2 and SP1 in thyroid carcinoma cells. Strikingly, CDC2 depletion in TPC-1 cells resulted in enhanced expression and phosphorylation of hPTTG and reduced cellular proliferation. In reciprocal experiments, hPTTG overexpression induced EGF, IGF-1, and TGFα mRNAs in primary human thyrocytes. Treatment of primary human thyrocytes with conditioned media derived from hPTTG-transfected cells resulted in autocrine upregulation of hPTTG protein, which was ameliorated by growth factor depletion or growth factor receptor tyrosine kinase inhibitors. A transgenic murine model of thyroid targeted hPTTG overexpression (hPTTG-Tg) (FVB/N strain, both sexes) demonstrated smaller thyroids with reduced cellular proliferation and enhanced secretion of Egf. In contrast, Pttg(-/-) knockout mice (c57BL6 strain, both sexes) showed reduced thyroidal Egf mRNA expression. These results define hPTTG as having a central role in thyroid autocrine signaling mechanisms via growth factors, with profound implications for promotion of transformed cell growth.

  8. Temozolomide-Induced Shrinkage of Invasive Pituitary Adenoma in Patient with Nelson’s Syndrome: A Case Report and Review of the Literature

    Directory of Open Access Journals (Sweden)

    Maria Kurowska

    2015-01-01

    Full Text Available Introduction. Invasive tumours in Nelson’s syndrome need aggressive therapy. Recent reports have documented the efficacy of temozolomide (TMZ in the treatment of adenomas resistant to conventional management. Objective. The review of the literature concerning TMZ treatment of atypical corticotroph adenomas and a case study of 56-year-old woman who developed Nelson’s syndrome. Treatment Proceeding. The patient with Cushing’s disease underwent transsphenoidal adenomectomy followed by a 27-month-long period of remission. Due to a regrowth of the tumor, she underwent two reoperations followed by stereotactic radiotherapy. Because of treatment failures, bilateral adrenalectomy was performed. Then she developed Nelson’s syndrome. A fourth transsphenoidal adenomectomy was performed, but there was a rapid recurrence. Five months later, she underwent a right frontotemporal craniotomy. Due to a rapid regrowth of the tumour, the patient did not receive gamma-knife therapy and was treated with cabergoline and somatostatin analogue for some time. Only TMZ therapy resulted in marked clinical, biochemical, and radiological improvement. To date, this is the first case of invasive corticotroph adenoma in Nelson’s syndrome treated with temozolomide in Poland. Conclusion. In our opinion, temozolomide can be an effective treatment option of invasive adenomas in Nelson’s syndrome.

  9. CROSS-SECTIONAL STUDY OF VISUAL FIELD DEFECTS IN PITUITARY GLAND TUMORS

    Directory of Open Access Journals (Sweden)

    Ananth Bhandary

    2014-08-01

    Full Text Available AIM: To study the proportion of patients with visual field defects in pituitary adenomas And to study the pattern of visual field defects in pituitary adenomas. MATERIALS AND METHODS: 24 patients diagnosed with a pituitary adenoma underwent complete ophthalmic and Humphrey’s Perimetry 30 – 2 visual field test at Department of ophthalmology, M. S Ramaiah Hospital between November 2011 to May 2013. RESULTS: Among the 24 cases in the study, 3 cases were of pituitary micro adenoma constituting 12.5% and the remaining cases (21 cases were pituitary macro adenoma, constituting 87.5%. Visual acuity of 6/6 – 6/12 were observed in 28 (58.3% out of total 48 eyes. Visual field defects were observed in 19 cases (79%. Bilateral temporal hemianopia was observed in the majority (41% of cases with field defects. One eye blind and contra lateral temporal hemianopia was observed in 20.8%. One eye temporal hemianopia and other eye involvement of 3 quadrants seen in 2 patients (8.4%. 5 patients had no visual field defects. CONCLUSION: Although ophthalmologists have a minor role in primary diagnosis of pituitary adenoma, routine ophthalmologic examination is very important. To detect early visual field defects, automated perimetry should be done as a part routine examination in patients with suspected pituitary adenoma

  10. Dengue hemorrhagic fever: A rare cause of pituitary tumor hemorrhage and reversible vision loss

    Directory of Open Access Journals (Sweden)

    Vimal Kumar

    2011-01-01

    Full Text Available Dengue hemorrhagic fever leading to hemorrhage in pituitary adenoma is not reported till date: We herein report the first case of bilateral visual loss secondary to pituitary adenoma hemorrhage associated with dengue hemorrhagic fever. Urgent transnasal trans sphenoidal decompression of the macroadenoma prevented permanent visual loss in this patient. Pituitary apoplexy should be considered as differential diagnosis of visual deterioration apart from retinal hemorrhage, maculopathy, and optic neuropathy in cases of dengue hemorrhagic fever. Early decompression of optic nerves helped in the restoration of vision.

  11. Downregulation of miR-410 targeting the cyclin B1 gene plays a role in pituitary gonadotroph tumors

    Science.gov (United States)

    Müssnich, Paula; Raverot, Gerald; Jaffrain-Rea, Marie-Lise; Fraggetta, Filippo; Wierinckx, Anne; Trouillas, Jacqueline; Fusco, Alfredo; D'Angelo, Daniela

    2015-01-01

    MicroRNAs (miRNAs) are small noncoding RNAs that act as posttranscriptional regulators of gene expression, and are frequently altered in human neoplasias. Here, we have analyzed the miRNA expression profile of human gonadotroph adenomas versus normal pituitary tissue using a miRNACHIP microarray. We demonstrate that miRNA-410 is downregulated in gonadotroph adenomas when compared with normal pituitary gland. We validate CCNB1 as target of miRNA-410 since its overexpression reduces CCNB1 at protein and mRNA levels, decreasing cell proliferation. In conclusion, our study suggess that the downregulation of miRNA-410 plays a role in the behavior of gonadotroph tumors. PMID:26125663

  12. Pituitary tumor transforming gene binding factor: a new gene in breast cancer.

    Science.gov (United States)

    Watkins, Rachel J; Read, Martin L; Smith, Vicki E; Sharma, Neil; Reynolds, Gary M; Buckley, Laura; Doig, Craig; Campbell, Moray J; Lewy, Greg; Eggo, Margaret C; Loubiere, Laurence S; Franklyn, Jayne A; Boelaert, Kristien; McCabe, Christopher J

    2010-05-01

    Pituitary tumor transforming gene (PTTG) binding factor (PBF; PTTG1IP) is a relatively uncharacterized oncoprotein whose function remains obscure. Because of the presence of putative estrogen response elements (ERE) in its promoter, we assessed PBF regulation by estrogen. PBF mRNA and protein expression were induced by both diethylstilbestrol and 17beta-estradiol in estrogen receptor alpha (ERalpha)-positive MCF-7 cells. Detailed analysis of the PBF promoter showed that the region -399 to -291 relative to the translational start site contains variable repeats of an 18-bp sequence housing a putative ERE half-site (gcccctcGGTCAcgcctc). Sequencing the PBF promoter from 122 normal subjects revealed that subjects may be homozygous or heterozygous for between 1 and 6 repeats of the ERE. Chromatin immunoprecipitation and oligonucleotide pull-down assays revealed ERalpha binding to the PBF promoter. PBF expression was low or absent in normal breast tissue but was highly expressed in breast cancers. Subjects with greater numbers of ERE repeats showed higher PBF mRNA expression, and PBF protein expression positively correlated with ERalpha status. Cell invasion assays revealed that PBF induces invasion through Matrigel, an action that could be abrogated both by siRNA treatment and specific mutation. Furthermore, PBF is a secreted protein, and loss of secretion prevents PBF inducing cell invasion. Given that PBF is a potent transforming gene, we propose that estrogen treatment in postmenopausal women may upregulate PBF expression, leading to PBF secretion and increased cell invasion. Furthermore, the number of ERE half-sites in the PBF promoter may significantly alter the response to estrogen treatment in individual subjects.

  13. Tumor Shrinkage With Lanreotide Autogel 120 mg as Primary Therapy in Acromegaly: Results of a Prospective Multicenter Clinical Trial

    National Research Council Canada - National Science Library

    Caron, Philippe J; Bevan, John S; Petersenn, Stephan; Flanagan, Daniel; Tabarin, Antoine; Prévost, Gaëtan; Maisonobe, Pascal; Clermont, Antoine

    2014-01-01

    .... There are also limited data for the long-acting lanreotide formulation. Objective: The aim of the study was to better characterize the effects of primary lanreotide Autogel treatment on tumor size in patients with GH-secreting macroadenomas. Design...

  14. Prediction of postoperative diabetes insipidus using morphological hyperintensity patterns in the pituitary stalk on magnetic resonance imaging after transsphenoidal surgery for sellar tumors.

    Science.gov (United States)

    Hayashi, Yasuhiko; Kita, Daisuke; Watanabe, Takuya; Fukui, Issei; Sasagawa, Yasuo; Oishi, Masahiro; Tachibana, Osamu; Ueda, Fumiaki; Nakada, Mitsutoshi

    2016-12-01

    Diabetes insipidus (DI) remains a complication of transsphenoidal surgery (TSS) for sellar and parasellar tumors. Antidiuretic hormone (ADH) appears as hyper intensity (HI) in the pituitary stalk and the posterior lobe of the pituitary gland on T1-weighted magnetic resonance (MR) imaging. Its disappearance from the posterior lobe occurs with DI, indicating a lack of ADH. The appearance of HI in the pituitary stalk indicates disturbances in ADH transport. This retrospective study included 172 patients undergoing TSS for sellar tumors at our institute from 2006 to 2014. Sequential T1-weighted MR images without enhancement were evaluated for HI in the pituitary stalk and the posterior lobe to assess the localization of ADH before and at intervals after TSS. DI was assessed pre- and postoperatively. HI in the pituitary stalk showed the following morphology: (1) ovoid in the distal end of the pituitary stalk (group A), (2) linear in the distal part of the pituitary stalk (group B), (3) linear in the whole pituitary stalk (group C). Preoperative DI occurred in 6 patients (3.5 %) with no HI observed in the posterior lobe. Postoperative DI was transient in 82 patients (47.7 %), and permanent in 11 (6.4 %). One week after surgery, HI was absent in the posterior lobe in 74 patients (43.0 %), and present in the pituitary stalk in 99 patients (57.6 %); both were significantly correlated with postoperative DI (p < 0.001). The absence of HI in the posterior lobe (A, 48.9 %; B, 68.3 %; C, 92.3 %), persistence of DI (A, 3.7 days; B, 45.9 days; C, 20.5 months), and duration until HI recovery in the posterior lobe (A, 3.6 months; B, 6.8 months; C, 22.9 months) were greatest in group C, followed by group B, and then group A. Fourteen group A patients did not have postoperative DI despite having HI in the pituitary stalk and the posterior lobe. Four group C patients developed permanent DI with persistence HI in the pituitary stalk. HI in the pituitary stalk and its

  15. A case of pediatric virilizing adrenocortical tumor resulting in hypothalamic-pituitary activation and central precocious puberty following surgical removal.

    Science.gov (United States)

    Miyoshi, Yoko; Oue, Takaharu; Oowari, Mitsugu; Soh, Hideki; Tachibana, Makiko; Kimura, Sadami; Kiyohara, Yuki; Yamada, Hiroyuki; Bessyo, Kazuhiko; Mushiake, Sotaro; Homma, Keiko; Hasegawa, Tomonobu; Sasano, Hironobu; Ozono, Keiichi

    2009-01-01

    We present a 6-year-old boy with a virilizing adrenocortical tumor who initially presented with peripheral precocious puberty. Development of facial acne, pubic hair and a growth spurt were noted at the age of five. A low-pitched voice as well as maturation of external genitalia was noted at the age of six. Both serum and urinary levels of adrenal androgens were elevated. Abdominal computed tomography revealed a large right suprarenal mass and he underwent surgical resection without any complications. The histological diagnosis was adrenocortical carcinoma according to the criteria of Weiss. Following surgical removal of the androgen-producing tumor, the patient subsequently developed hypothalamic-pituitary activation and demonstrated central precocious puberty. He was treated with a gonadotropin-releasing hormone agonist in order to delay further pubertal progression. Clinical follow-up of potential secondary effects of excess hormone secretion after removal is important in some pediatric patients with virilizing adrenocortical tumor.

  16. Ikaros isoforms in human pituitary tumors: distinct localization, histone acetylation, and activation of the 5' fibroblast growth factor receptor-4 promoter.

    Science.gov (United States)

    Ezzat, Shereen; Yu, Shunjiang; Asa, Sylvia L

    2003-09-01

    Targeted expression of a human pituitary tumor derived-fibroblast growth factor receptor-4 (FGFR4) recapitulates pituitary tumorigenesis. We have shown that FGFR4 is a target for Ikaros, a zinc finger-containing transcription factor that localizes to heterochromatin regions and participates in higher order chromatin complexes and control of gene expression. We report here the expression of Ikaros and functional differences between its alternatively spliced variants in human pituitary tumors. Ik1 expression was detected in human pituitary tumors and we also identified a truncated isoform consistent with the non-DNA-binding Ik6 isoform in a subset of adenomas by reverse transcriptase-polymerase chain reaction, sequencing, and Western immunoblotting. Transfection of Ik6 in GH4 pituitary cells resulted in predominantly cytoplasmic expression as compared to Ik1, which resulted in exclusively nuclear expression as determined by immunofluorescence and immunoblotting of fractionated protein. Immunohistochemistry of primary human pituitary adenomas localized Ikaros expression to the nuclear compartment but also in the cytoplasm, the latter consistent with Ik6. Expression of Ikaros and truncated non-DNA-binding isoforms was also suggested by electromobility shift assays using nuclear proteins from primary human pituitary adenomas. Ik6 resulted in reversal of the effects of Ik1 on wild-type 5' FGFR4 promoter activity, histone acetylation, and regulation of the endogenous gene. We conclude that dominant-negative Ik6 isoforms with their distinct localization and effects on Ik1 action may contribute to the altered expression of FGFR4 and possibly other target genes in human pituitary tumors.

  17. Prediction of Long-term Post-operative Testosterone Replacement Requirement Based on the Pre-operative Tumor Volume and Testosterone Level in Pituitary Macroadenoma

    OpenAIRE

    Cheng-Chi Lee; Chung-Ming Chen; Shih-Tseng Lee; Kuo-Chen Wei; Ping-Ching Pai; Cheng-Hong Toh; Chi-Cheng Chuang

    2015-01-01

    Non-functioning pituitary macroadenomas (NFPAs) are the most prevalent pituitary macroadenomas. One common symptom of NFPA is hypogonadism, which may require long-term hormone replacement. This study was designed to clarify the association between the pre-operative tumor volume, pre-operative testosterone level, intraoperative resection status and the need of long-term post-operative testosterone replacement. Between 2004 and 2012, 45 male patients with NFPAs were enrolled in this prospective...

  18. FGFR4 polymorphic alleles modulate mitochondrial respiration: A novel target for somatostatin analog action in pituitary tumors.

    Science.gov (United States)

    Ezzat, Shereen; Wang, Ri; Pintilie, Melania; Asa, Sylvia L

    2017-01-10

    We reported that a single nucleotide polymorphism (SNP) at codon 388 of the fibroblast growth factor receptor 4 (FGFR4-Gly388Arg) can result in distinct proteins that alter pituitary cell growth and function. Here, we examined the differential properties of the available therapeutic somatostatin analogs, octreotide and pasireotide, in pituitary tumor cells expressing the different FGFR4 isoforms. Consistent with their enhanced growth properties, FGFR4-R388-expressing cells show higher mitochondrial STAT3 serine phosphorylation driving basal and maximal oxygen consumption rate (OCR) than pituitary cells expressing the more common FGFR4-G388 isoform. While both somatostatin analogs reduce the OCR in FGFR4-G388 cells, pasireotide was more effective in decreasing OCR in cells expressing the variant FGFR4-R388 isoform. Down-regulation of somatostatin receptor 5 (SSTR5) abrogated the effect of pasireotide, demonstrating its involvement in mediating this action. The effects on OCR were recapitulated by introducing a constitutively active serine STAT3 but not by a tyrosine-active mutant. Moreover, pharmacologic inhibition demonstrated the role for the phosphatase PP2A in mediating the dephosphorylation of STAT3-S727 by pasireotide. Our data indicate that FGFR4 polymorphic isoforms mediate signaling that yields mitochondrial therapeutic targets of relevance to the actions of different somatostatin analogs.

  19. Human chorionic somatomammotropin and growth hormone gene expression in rat pituitary tumor cells is dependent on proximal promoter sequences

    Energy Technology Data Exchange (ETDEWEB)

    Nachtigal, M.W.; Nickel, B.E.; Klassen, M.E.; Cattini, P.A. (Univ. of Manitoba, Winnipeg (Canada)); Zhang, Wengang; Eberhardt, N.L. (Univ. of California, San Francisco (USA))

    1989-06-12

    Human placental chorionic somatomammotropin (hCS-A or hCS-B) and pituitary growth hormone (hGH-N) are related by structure and function. The hCS-A gene is expressed in rat pituitary tumor (GC) cells after gene transfer. Deletion of hCS-A 5{prime}-flanking DNA reveals repressor activity upstream of nucleotide {minus}132, and a region essential for expression in GC cells between nucleotides {minus}94 and {minus}61. The sequences in this region differ from the equivalent hGH-N gene DNA by one nucleotide, and include the binding site for a pituitary-specific factor (GHF-1), required for hGH-N expression in GC cells. Exchange of hGH-N with hCS-A gene DNA in this region maintains expression in GC cells. By contrast, modification of these sequences blocks expression. These data indicate that proximal promoter sequences, equivalent to those bound by GHF-1 on the hGH-N gene, are required for hCS-A expression in GC cells.

  20. Successful Pregnancy in a Female with a Large Prolactinoma after Pituitary Tumor Apoplexy

    Directory of Open Access Journals (Sweden)

    Butheinah A. Al-Sharafi

    2013-01-01

    Full Text Available Pituitary apoplexy is a rare condition which may cause death of the patient in severe cases and many times leads to hypopituitarism. We report a case of apoplexy in a large prolactinoma resulting in empty sella syndrome followed by a successful pregnancy. Our patient is a 32-year-old female with a history of a macroprolactinoma for approximately 17 years who presented to our hospital with a history of severe headache, decreased level of consciousness, fever, nausea, vomiting, and diplopia of 12 hours duration. Magnetic resonance imaging done on admission showed an increase in the size of the pituitary adenoma with a subtle hemorrhage. The patient was admitted to the intensive care unit and treated conservatively. The condition of the patient improved within a few days. A few months later, she started having regular menstrual periods. A magnetic resonance imaging of the pituitary 1.5 years later was reported as empty sella syndrome, and approximately one year later she became pregnant. With the pituitary adenoma being resolved after developing pituitary apoplexy and continuing on cabergoline, the patient had a successful pregnancy with no recurrence of the adenoma after delivery and breastfeeding.

  1. Mechanisms of activation of NHE by cell shrinkage and by calyculin A in Ehrlich ascites tumor cells

    DEFF Research Database (Denmark)

    Pedersen, Stine Helene Falsig; Varming, Camilla; Hoffmann, E K

    2002-01-01

    The Na+/H+ exchanger isoforms NHE1, NHE2, and NHE3 were all found to be expressed in Ehrlich ascites tumor cells, as evaluated by Western blotting and confocal microscopy. Under unstimulated conditions, NHE1 was found predominantly in the plasma membrane, NHE3 intracellularly, and NHE2 in both...

  2. Childhood feedback pituitary tumor-like proliferation caused by primary hypothyroidism : a case report%儿童原发性甲状腺功能减退继发垂体反馈性瘤样增生1例

    Institute of Scientific and Technical Information of China (English)

    汪霞; 黄建勇

    2013-01-01

    Feedback pituitary tumor hyperplasia refers to the corresponding pituitary hormone cell hyperpla-sia and pituitary augmentation caused by the primary hypofunction of target gland. The incidence of feedback pituitary tumor-like proliferation caused by primary hypothyroidism is the highest,accounting for 33. 3% of all feedback tumor. Children are rare,but due to the involvement of growth and development,and easily misdiagnosed as pituitary adenomas. However,the clinical treatment of the two principles are completely different from each other. This article will report a case of feedback Pituitary tumor-like proliferation. Caused by primary hypothyroidism in recent years in our hospital. The clinical symptoms, laboratory tests, imaging features, diagnosis and treatment and prognosis of this case will be demonstrated in the report.

  3. Tumor shrinkage with lanreotide Autogel 120 mg as primary therapy in acromegaly: results of a prospective multicenter clinical trial.

    Science.gov (United States)

    Caron, Philippe J; Bevan, John S; Petersenn, Stephan; Flanagan, Daniel; Tabarin, Antoine; Prévost, Gaëtan; Maisonobe, Pascal; Clermont, Antoine

    2014-04-01

    Methodological shortcomings often compromise investigations into the effects of primary somatostatin-analog treatment on tumor size in acromegaly. There are also limited data for the long-acting lanreotide formulation. The aim of the study was to better characterize the effects of primary lanreotide Autogel treatment on tumor size in patients with GH-secreting macroadenomas. PRIMARYS was a 48-week, multicenter, open-label, single-arm study. The study was conducted at specialist endocrine centers. Treatment-naïve acromegalic patients with GH-secreting macroadenomas participated in the study. Lanreotide Autogel 120 mg was administered sc every 28 days (without dose titration). The primary endpoint was the proportion of patients with clinically significant (≥20%) tumor volume reduction (TVR) at week 48/last post-baseline value available using central assessments from three readers. The null hypothesis (H0) for the primary endpoint was that the proportion with TVR was ≤55%. Secondary endpoints included: TVR at other time points, GH and IGF-1, acromegalic symptoms, quality of life (QoL), and safety. Sixty-four of 90 (71.1%) patients completed the study. Clinically significant TVR at 48 weeks/last post-baseline value available was achieved by 62.9% (95% confidence interval, 52.0, 72.9) of 89 patients in the primary analysis (intention-to-treat population; H0 not rejected) and 71.9-75.3% in sensitivity (n = 89) and secondary analyses (n = 63) (H0 rejected). At 12 weeks, 54.1% had clinically significant TVR. Early and sustained improvements also occurred in GH and IGF-1, acromegalic symptoms, and QoL. No patients withdrew due to gastrointestinal intolerance. Primary treatment with lanreotide Autogel, administered at 120 mg (highest available dose) without dose titration, in patients with GH-secreting macroadenomas provides early and sustained reductions in tumor volume, GH and IGF-1, and acromegalic symptoms, and improves QoL.

  4. Breast specimen shrinkage following formalin fixation

    Directory of Open Access Journals (Sweden)

    Horn CL

    2014-02-01

    Full Text Available Christopher L Horn, Christopher Naugler Department of Pathology and Laboratory Medicine, University of Calgary, and Calgary Laboratory Services, Calgary, AB, Canada Abstract: Accurate measurement of primary breast tumors and subsequent surgical margin assessment is critical for pathology reporting and resulting patient therapy. Anecdotal observations from pathology laboratory staff indicate possible shrinkage of breast cancer specimens due to the formalin fixation process. As a result, we conducted a prospective study to investigate the possible shrinkage effects of formalin fixation on breast cancer specimens. The results revealed no significant changes in tumor size, but there were significant changes in the distance to all surgical resection margins from the unfixed to fixed state. This shrinkage effect could interfere with the accuracy of determining distance to margin assessment and tumor-free margin assessment. Thus, changes in these measurements due to the formalin fixation process have the potential to alter treatment options for the patient. Keywords: breast margins, formalin, shrinkage, cancer

  5. Long-term results of radiotherapy for pituitary adenomas. Evaluation of tumor control and hypopituitarism after radiotherapy

    Energy Technology Data Exchange (ETDEWEB)

    Tsuchida, Emiko; Sakai, Kunio; Matsumoto, Yasuo; Sugita, Tadashi; Sasamoto, Ryuta [Niigata Univ. (Japan). School of Medicine

    1999-09-01

    To evaluate the results of conventional radiotherapy for pituitary adenomas assessed with computed tomography (CT) or magnetic resonance imaging (MRI). Endpoints include tumor control, normalization of hormone levels in functioning adenomas, and hypopituitarism after radiotherapy as an adverse effect. Forty-two patients were treated with radiotherapy from 1982 to 1995 at Niigata University Hospital. Forty patients were irradiated after surgery because of residual adenomas in 33 patients and tumor regrowth in 7 patients. One patient was treated with radiotherapy alone, and the remaining 1 patient was treated with preoperative radiotherapy. Tumor size and extension were evaluated using CT or MRI, and all tumors were macroadenomas. They consisted of 18 non-functioning and 24 functioning adenomas (growth hormone (GH)-secreting: 11, prolactinomas: 7, concomitant GH and prolactin (PRL)-secreting: 5, gonadotropin-secreting: 1). Treatment was given in 200 cGy daily fraction size and a total dose of 50 Gy was given to most patients. Sixteen patients with GH- and/or PRL-secreting adenomas received bromocriptine. Tumor progression was determined by increase in tumor size as shown by CT or MRI. Hypopituitarism after radiotherapy was evaluated using the functions of corticotropin (ACTH), thyrotropin (TSH), and gonadotropin. Median follow-up time from the end of radiotherapy was 103 months. Tumor progression occurred in 2 out of 42 patients and 10-year progression-free rate for all patients was 93.7%. Normalization of GH levels was obtained in 12 of 16 GH-secreting adenomas with a mean time of 27 months after radiotherapy, and 9 of 12 PRL-secreting adenomas achieved normalization of PRL levels with a mean time of 34 months. One gonadotropin-secreting adenoma achieved normalization of gonadotropin level at 21 months after radiotherapy. The incidence of hypopituitarism after radiotherapy increased with time, and cumulative risk of deficiencies of ACTH, TSH, and gonadotropin at 10

  6. Long-term follow-up of patients with pituitary macroadenomas after postoperative radiation therapy. Analysis of tumor control and functional outcome

    Energy Technology Data Exchange (ETDEWEB)

    Langsenlehner, T.; Jakse, G.; Kapp, K.S.; Mayer, R. [Medical Univ. of Graz (Austria). Dept. of Therapeutic Radiology and Oncology; Stiegler, C. [Medical Univ. of Graz (Austria). Div. of Endocrinology and Nuclear Medicine; Quehenberger, F. [Medical Univ. of Graz (Austria). Inst. for Medical Informatics, Statistics and Documentation; Feigl, G.C. [Regensburg Univ. (Germany). Dept. of Neurosurgery; Mokry, M. [Medical Univ. of Graz (Austria). Dept. of Neurosurgery; Langsenlehner, U. [Medical Univ. of Graz (Austria). Div. of Oncology

    2007-05-15

    Purpose: Evaluation of long-term tumor control, normalization of hormonal hypersecretion, including incidence and time course of pituitary dysfunction following postoperative radiotherapy of pituitary macroadenomas. Patients and Methods: In a retrospective study, the data of 87 patients with pituitary macroadenomas (61 non-secreting adenomas, 26 secreting adenomas) treated between 1984 and 1994 were analyzed. All patients underwent surgery and received postoperative external-beam radiotherapy with a mean dose of 50.4 Gy (range 46-54 Gy). Results: After a follow-up of 15 years the local tumor control rate achieved was 93.0% for non-secreting adenomas and 100% for secreting adenomas, respectively. Normalization of endocrine hypersecretion was noted in 24 of 26 patients (92%). Detailed endocrinological follow-up data were analyzed by an experienced endocrinologist in 77 patients. After a median follow-up of 10.54 years (mean 10.22; range 1.39-20.75 years), in 75 of 77 patients (97%) a hypopituitarism was observed (partial hypopituitarism, n = 28 [36%], panhypopituitarism, n = 47 [61%]), and 68 out of 77 patients (88%) showed evidence of radiotherapy-induced pituitary disorders. The somatotropic function was most commonly affected, followed by gonadal, thyroid and adrenal function. The gonadal axis showed to be the first to be disturbed. 67 patients (87%) required a hormone replacement therapy. Conclusion: Radiotherapy after pituitary surgery is highly effective in reducing hormonal hypersecretion and preventing recurrences of pituitary adenomas. However, pituitary insufficiencies are commonly observed after radiotherapy requiring a close follow-up to ensure timely diagnosis of pituitary dysfunction and an early inception of hormone replacement therapy. (orig.)

  7. Long-term follow-up of patients with pituitary macroadenomas after postoperative radiation therapy: analysis of tumor control and functional outcome.

    Science.gov (United States)

    Langsenlehner, Tanja; Stiegler, Claudia; Quehenberger, Franz; Feigl, Günther C; Jakse, Gabi; Mokry, Michael; Langsenlehner, Uwe; Kapp, Karin S; Mayer, Ramona

    2007-05-01

    Evaluation of long-term tumor control, normalization of hormonal hypersecretion, including incidence and time course of pituitary dysfunction following postoperative radiotherapy of pituitary macroadenomas. In a retrospective study, the data of 87 patients with pituitary macroadenomas (61 non-secreting adenomas, 26 secreting adenomas) treated between 1984 and 1994 were analyzed. All patients underwent surgery and received postoperative external-beam radiotherapy with a mean dose of 50.4 Gy (range 46-54 Gy). After a follow-up of 15 years the local tumor control rate achieved was 93.0% for non-secreting adenomas and 100% for secreting adenomas, respectively. Normalization of endocrine hypersecretion was noted in 24 of 26 patients (92%). Detailed endocrinological follow-up data were analyzed by an experienced endocrinologist in 77 patients. After a median follow-up of 10.54 years (mean 10.22; range 1.39-20.75 years), in 75 of 77 patients (97%) a hypopituitarism was observed (partial hypopituitarism, n = 28 [36%], panhypopituitarism, n = 47 [61%]), and 68 out of 77 patients (88%) showed evidence of radiotherapy-induced pituitary disorders. The somatotropic function was most commonly affected, followed by gonadal, thyroid and adrenal function. The gonadal axis showed to be the first to be disturbed. 67 patients (87%) required a hormone replacement therapy. Radiotherapy after pituitary surgery is highly effective in reducing hormonal hypersecretion and preventing recurrences of pituitary adenomas. However, pituitary insufficiencies are commonly observed after radiotherapy requiring a close follow-up to ensure timely diagnosis of pituitary dysfunction and an early inception of hormone replacement therapy.

  8. Pathobiology and oncogenesis of pituitary corticotroph adenomas in dogs

    NARCIS (Netherlands)

    Hanson, J.M.

    2007-01-01

    Pituitary-dependent hyperadrenocorticism (PDH) or Cushing's disease is a common endocrinopathy in the elderly dog caused by a pituitary adrenocorticotrophic hormone (ACTH) producing tumor (corticotroph adenoma) of unknown pathogenesis. Surgical removal of the pituitary tumor is applied as routine

  9. Tumor consistency of pituitary macroadenomas: predictive analysis on the basis of imaging features with contrast-enhanced 3D FIESTA at 3T.

    Science.gov (United States)

    Yamamoto, J; Kakeda, S; Shimajiri, S; Takahashi, M; Watanabe, K; Kai, Y; Moriya, J; Korogi, Y; Nishizawa, S

    2014-02-01

    Preoperative evaluation of pituitary macroadenoma tumor consistency is important for neurosurgery. Thus, we aimed to retrospectively assess the role of contrast-enhanced FIESTA in predicting the tumor consistency of pituitary macroadenomas. Twenty-nine patients with pituitary macroadenomas underwent conventional MR imaging sequences and contrast-enhanced FIESTA before surgery. Two neuroradiologists assessed the contrast-enhanced FIESTA, contrast-enhanced T1WI, and T2WI. On the basis of surgical findings, the macroadenomas were classified by the neurosurgeons as either soft or hard. Finally, Fisher exact probability tests and unpaired t tests were used to compare predictions on the basis of the MR imaging findings with the tumor consistency, collagen content, and postoperative tumor size. The 29 pituitary macroadenomas were classified as either solid or mosaic types. Solid type was characterized by a homogeneous pattern of tumor signal intensity without intratumoral hyperintense dots, whereas the mosaic type was characterized by many intratumoral hyperintense dots on each MR image. Statistical analyses revealed a significant correlation between tumor consistency and contrast-enhanced FIESTA findings. Sensitivity and specificity were higher for contrast-enhanced FIESTA (1.00 and 0.88-0.92, respectively) than for contrast-enhanced T1WI (0.80 and 0.25-0.33, respectively) and T2WI (0.60 and 0.38-0.54, respectively). Compared with mosaic-type adenomas, solid-type adenomas tended to have a hard tumor consistency as well as a significantly higher collagen content and lower postoperative tumor size. Contrast-enhanced FIESTA may provide preoperative information regarding the consistency of macroadenomas that appears to be related to the tumor collagen content.

  10. Expression of the pituitary tumor transforming gene (PTTG1) in pheochromocytoma as a potential marker for distinguishing benign versus malignant tumors.

    Science.gov (United States)

    Haji Amousha, Mohamad Reza; Sabetkish, Nastaran; Sabet Kish, Nastaran; Heshmat, Ramin; Rajabiani, Afsaneh; Saffar, Hiva; Haghpanah, Vahid; Tavangar, Seyed Mohammad

    2015-01-01

    The Distinction between malignant and benign pheochromocytoma has always been a diagnostic challenge over the last decades. To date, the only reliable criterion is metastasis. The aim of the present study was to investigate the possible expression of pituitary-tumor transforming gene (PTTG1) and retinoblastoma (Rb) in benign and malignant pheochromocytoma. Paraffin blocks of 44 and 11 patients diagnosed with benign and malignant pheochromocytoma were collected. Parameters such as sex, age, tumor size, necrosis, and histological features were compared between the benign and malignant groups as well as immunohistochemical labeling using specific antibodies. PTTG1 showed negative expression in all (44) benign and 9 out of 11 (81.8%) malignant tumors with only 2 out of 11 (18.2%) malignant tumors showed positive reactivity for PTTG1 (P: 0.037) with spindle cell histological pattern in both of them (P: 0.013). Although Rb expression in malignant tumors (81.8%) was slightly more than the benign ones (52.3%), no statistically significant correlation was observed (P: 0.087). These results suggest that PTTG1 immunostaining may play a key role in distinguishing between benign and malignant phaeochromocytoma. However, larger studies are necessary to confirm the outcomes of the present study.

  11. 17-beta-estradiol-dependent regulation of somatostatin receptor subtype expression in the 7315b prolactin secreting rat pituitary tumor in vitro and in vivo

    NARCIS (Netherlands)

    H.A. Visser-Wisselaar (Heleen); C.J. van Uffelen; P.M. van Koetsveld (Peter); E.G. Lichtenauer-Kaligis; A.M. Waaijers (Annet); P. Uitterlinden (Piet); D.M. Mooy; S.W.J. Lamberts (Steven); L.J. Hofland (Leo)

    1997-01-01

    textabstractIn the present study, we have investigated the role of estrogens in the regulation of somatostatin receptor subtype (sst) expression in 7315b PRL-secreting rat pituitary tumor cells in vitro and in vivo. sst were undetectable in freshly dispersed cells of the transplant

  12. Pituitary Gland Disorders Overview

    Science.gov (United States)

    ... reducing the amount of water lost in urine Oxytocin – causes milk to flow from the breasts in breastfeeding women, and may also help labor to progress Pituitary Tumors The most frequent type ...

  13. Sequential pituitary MR imaging in Sheehan syndrome: report of 2 cases.

    Science.gov (United States)

    Kaplun, J; Fratila, C; Ferenczi, A; Yang, W C; Lantos, G; Fleckman, A M; Schubart, U K

    2008-05-01

    We present the evolution of pituitary changes in the cases of 2 patients with Sheehan syndrome as assessed by MR imaging. Both patients had severe postpartum hemorrhage, symptoms of pituitary gland apoplexy, and hypopituitarism. Sequential MR imaging demonstrated evidence of ischemic infarct in the pituitary gland with enlargement followed by gradual shrinkage during several months, to pituitary atrophy.

  14. Lack of tumor reduction in hyperprolactinemic women with extrasellar macroadenomas treated with bromocriptine

    Energy Technology Data Exchange (ETDEWEB)

    Boulanger, C.M.; Mashchak, C.A.; Chang, R.J.

    1985-10-01

    Three patients with hyperprolactinemia and large extrasellar pituitary macroadenomas were treated with bromocriptine, 10 mg daily, for 8 weeks. In spite of correction of their amenorrhea, galactorrhea, and hyperprolactinemia, radiologic evaluation by CT scan failed to show evidence of tumor shrinkage. After surgical resection, histologic examination revealed that PRL-secreting cells comprised only a small portion of the tumor cell population in two patients and in the third patient were completely absent. These cases illustrate that large nonfunctional pituitary tumors may mimic signs and symptoms of a prolactinoma and stress the importance of adequate radiologic evaluation during medical management. 8 references, 3 figures.

  15. Association of pituitary tumor transforming gene expression with early oral tumorigenesis and malignant progression of precancerous lesions.

    Science.gov (United States)

    Liao, Li-Jen; Hsu, Yi-Hsin; Yu, Chuan-Hang; Chiang, Chun-Pin; Jhan, Jing-Ru; Chang, Lien-Cheng; Lin, Jing-Jer; Lou, Pei-Jen

    2011-05-01

    Pituitary tumor transforming gene (PTTG1) is overexpressed in many types of human cancers and is involved in late-stage tumor progression. The role of PTTG1 in initiating tumorigenesis is unclear. PTTG1 expression was assessed in precancerous lesions and squamous cell carcinomas of the oral cavity (OSCC). The association between the protein expression and clinicopathologic parameters was analyzed. The expression level of PTTG1 upon carcinogen treatment was also investigated. PTTG1 was overexpressed in both precancerous lesions and OSCC. The expression of PTTG1 was associated with carcinogen exposure in vivo and in vitro. PTTG1 overexpression was an independent factor for oral cancer development in precancerous lesions. This study provides the first evidence that PTTG1 is involved in the early stages of oral tumorigenesis. Carcinogen exposure may cause the initial induction of PTTG1 expression in oral precancerous lesions. PTTG1 overexpression is a potential prognosticator for malignant progression of oral precancerous lesions. Copyright © 2010 Wiley Periodicals, Inc.

  16. [Practice guideline for diagnosis and treatment of craniopharyngioma and parasellar tumors of the pituitary gland].

    Science.gov (United States)

    Venegas, Eva; Concepcion, Blanco; Martin, Tomas; Soto, Alfonso

    2015-01-01

    Craniopharyngiomas are rare, locally aggressive epithelial tumors usually located in the sellar and suprasellar region. Diagnosis of craniopharyngioma is usually suggested by clinical and radiological findings that should be confirmed histologically. Surgery is the treatment of choice for most patients. The goal of surgery is to relieve compressive symptoms and to remove as much tumor as safely possible. Radiation therapy is the usual treatment to control postoperative tumor remnants and local recurrences. Parasellar lesions are low prevalent lesions and include neoplastic, inflammatory, infectious, developmental, and vascular diseases. Both their diagnosis and treatment depend on the type of lesion. Copyright © 2014 SEEN. Published by Elsevier Espana. All rights reserved.

  17. Succinate dehydrogenase (SDHx) mutations in pituitary tumors: could this be a new role for mitochondrial complex II and/or Krebs cycle defects?

    Science.gov (United States)

    Xekouki, Paraskevi; Stratakis, Constantine A

    2012-12-01

    Succinate dehydrogenase (SDH) or mitochondrial complex II is a multimeric enzyme that is bound to the inner membrane of mitochondria and has a dual role as it serves both as a critical step of the tricarboxylic acid or Krebs cycle and as a member of the respiratory chain that transfers electrons directly to the ubiquinone pool. Mutations in SDH subunits have been implicated in the formation of familial paragangliomas (PGLs) and/or pheochromocytomas (PHEOs) and in Carney-Stratakis syndrome. More recently, SDH defects were associated with predisposition to a Cowden disease phenotype, renal, and thyroid cancer. We recently described a kindred with the coexistence of familial PGLs and an aggressive GH-secreting pituitary adenoma, harboring an SDHD mutation. The pituitary tumor showed loss of heterozygosity at the SDHD locus, indicating the possibility that SDHD's loss was causatively linked to the development of the neoplasm. In total, 29 cases of pituitary adenomas presenting in association with PHEOs and/or extra-adrenal PGLs have been reported in the literature since 1952. Although a number of other genetic defects are possible in these cases, we speculate that the association of PHEOs and/or PGLs with pituitary tumors is a new syndromic association and a novel phenotype for SDH defects.

  18. The microvascular network of the pituitary gland: a model for the application of fractal geometry to the analysis of angioarchitecture and angiogenesis of brain tumors.

    Science.gov (United States)

    Di Ieva, A; Grizzi, F; Ceva-Grimaldi, G; Aimar, E; Serra, S; Pisano, P; Lorenzetti, M; Tancioni, F; Gaetani, P; Crotti, F; Tschabitscher, M; Matula, C; Rodriguez Y Baena, R

    2010-06-01

    In geometrical terms, tumor vascularity is an exemplary anatomical system that irregularly fills a three-dimensional Euclidean space. This physical characteristic, together with the highly variable vessel shapes and surfaces, leads to considerable spatial and temporal heterogeneity in the delivery of oxygen, nutrients and drugs, and the removal of metabolites. Although these biological features have now been well established, quantitative analyses of neovascularity in two-dimensional histological sections still fail to view tumor architecture in non-Euclidean terms, and this leads to errors in visually interpreting the same tumor, and discordant results from different laboratories. A review of the literature concerning the application of microvessel density (MVD) estimates, an Euclidean-based approach used to quantify vascularity in normal and neoplastic pituitary tissues, revealed some disagreements in the results and led us to discuss the limitations of the Euclidean quantification of vascularity. Consequently, we introduced fractal geometry as a better means of quantifying the microvasculature of normal pituitary glands and pituitary adenomas, and found that the use of the surface fractal dimension is more appropriate than MVD for analysing the vascular network of both. We propose extending the application of this model to the analysis of the angiogenesis and angioarchitecture of brain tumors.

  19. Serotonin, ATRX, and DAXX Expression in Pituitary Adenomas

    DEFF Research Database (Denmark)

    Casar-Borota, Olivera; Botling, Johan; Granberg, Dan

    2017-01-01

    Differential diagnosis based on morphology and immunohistochemistry between a clinically nonfunctioning pituitary neuroendocrine tumor (NET)/pituitary adenoma and a primary or secondary NET of nonpituitary origin in the sellar region may be difficult. Serotonin, a frequently expressed marker...... of the pituitary tumors expressed serotonin, suggesting that serotonin immunoreactive sellar tumors represent primary or secondary NETs of nonpituitary origin. Normal expression of ATRX and DAXX in pituitary tumors suggests that ATRX and DAXX do not play a role in the pathogenesis of pituitary endocrine tumors...... on a larger cohort of pituitary carcinomas are needed to clarify whether ATRX mutations may contribute to the metastatic potential in a subset of pituitary NETs....

  20. Tubocurarine blocks a calcium-dependent potassium current in rat tumoral pituitary cells.

    Science.gov (United States)

    Vacher, P; Vacher, A M; Mollard, P

    1998-04-30

    We investigated the effects of potassium channel inhibitors on electrical activity, membrane ionic currents, intracellular calcium concentration ([Ca2+]i) and hormone release in GH3/B6 cells (a line of pituitary origin). Patch-clamp recordings show a two-component after hyperpolarization (AHP) following each action potential (current clamp) or a two-component tail current (voltage-clamp). Both components can be blocked by inhibiting Ca2+ influx. Application of D-tubocurarine (dTc) (20-500 microM) reversibly suppressed the slowly decaying Ca2+-activated K+ tail current (I AHPs) in a concentration-dependent manner. On the other hand, low doses of tetraethylammonium ions (TEA+) only blocked the rapidly decaying voltage- and Ca2+-activated K+ tail current (I AHPf). Therefore, GH3/B6 cells exhibit at least two quite distinct Ca2+-dependent K+ currents, which differ in size, voltage- and Ca2+-sensitivity, kinetics and pharmacology. These two currents also play quite separate roles in shaping the action potential. d-tubocurarine increased spontaneous Ca2+ action potential firing, whereas TEA increased action potential duration. Thus, both agents stimulated Ca2+ entry. I AHPs is activated by a transient increase in [Ca2+]i such as a thyrotrophin releasing hormone-induced Ca2+ mobilization. All the K+ channel inhibitors we tested: TEA, apamin, dTC and charybdotoxin, stimulated prolactin and growth hormone release in GH3/B6 cells. Our results show that I AHPs is a good sensor for subplasmalemmal Ca2+ and that dTc is a good pharmacological tool for studying this current.

  1. Negative regulation of human growth hormone gene expression by insulin is dependent on hypoxia-inducible factor binding in primary non-tumor pituitary cells.

    Science.gov (United States)

    Vakili, Hana; Jin, Yan; Cattini, Peter A

    2012-09-28

    Insulin controls growth hormone (GH) production at multiple levels, including via a direct effect on pituitary somatotrophs. There are no data, however, on the regulation of the intact human (h) GH gene (hGH1) by insulin in non-tumor pituitary cells, but the proximal promoter region (nucleotides -496/+1) responds negatively to insulin in transfected pituitary tumor cells. A DNA-protein interaction was also induced by insulin at nucleotides -308/-235. Here, we confirmed the presence of a hypoxia-inducible factor 1 (HIF-1) binding site within these sequences (-264/-259) and investigated whether HIF-1 is associated with insulin regulation of "endogenous" hGH1. In the absence of primary human pituitary cells, transgenic mice expressing the intact hGH locus in a somatotroph-specific manner were generated. A significant and dose-dependent decrease in hGH and mouse GH RNA levels was detected in primary pituitary cell cultures from these mice with insulin treatment. Increasing HIF-1α availability with a hypoxia mimetic significantly decreased hGH RNA levels and was accompanied by recruitment of HIF-1α to the hGH1 promoter in situ as seen with insulin. Both inhibition of HIF-1 DNA binding by echinomycin and RNA interference of HIF-1α synthesis blunted the negative effect of insulin on hGH1 but not mGH. The insulin response is also sensitive to histone deacetylase inhibition/trichostatin A and associated with a decrease in H3/H4 hyperacetylation in the proximal hGH1 promoter region. These data are consistent with HIF-1-dependent down-regulation of hGH1 by insulin via chromatin remodeling specifically in the proximal promoter region.

  2. Prediction of Long-term Post-operative Testosterone Replacement Requirement Based on the Pre-operative Tumor Volume and Testosterone Level in Pituitary Macroadenoma.

    Science.gov (United States)

    Lee, Cheng-Chi; Chen, Chung-Ming; Lee, Shih-Tseng; Wei, Kuo-Chen; Pai, Ping-Ching; Toh, Cheng-Hong; Chuang, Chi-Cheng

    2015-11-05

    Non-functioning pituitary macroadenomas (NFPAs) are the most prevalent pituitary macroadenomas. One common symptom of NFPA is hypogonadism, which may require long-term hormone replacement. This study was designed to clarify the association between the pre-operative tumor volume, pre-operative testosterone level, intraoperative resection status and the need of long-term post-operative testosterone replacement. Between 2004 and 2012, 45 male patients with NFPAs were enrolled in this prospective study. All patients underwent transsphenoidal surgery. Hypogonadism was defined as total serum testosterone levels of testosterone to patients with defined hypogonadism or clinical symptoms of hypogonadism. Hormone replacement for longer than 1 year was considered as long-term therapy. The need for long-term post-operative testosterone replacement was significantly associated with larger pre-operative tumor volume (p = 0.0067), and lower pre-operative testosterone level (p = 0.0101). There was no significant difference between the gross total tumor resection and subtotal resection groups (p = 0.1059). The pre-operative tumor volume and testosterone level impact post-operative hypogonadism. By measuring the tumor volume and the testosterone level and by performing adequate tumor resection, surgeons will be able to predict post-operative hypogonadism and the need for long-term hormone replacement.

  3. Hydrogen sulfide induces hyperpolarization and decreases the exocytosis of secretory granules of rat GH3 pituitary tumor cells.

    Science.gov (United States)

    Mustafina, Alsu N; Yakovlev, Aleksey V; Gaifullina, Aisylu Sh; Weiger, Thomas M; Hermann, Anton; Sitdikova, Guzel F

    2015-10-02

    The aim of the present study was to evaluate the effects of hydrogen sulfide (H2S) on the membrane potential, action potential discharge and exocytosis of secretory granules in neurosecretory pituitary tumor cells (GH3). The H2S donor - sodium hydrosulfide (NaHS) induced membrane hyperpolarization, followed by truncation of spontaneous electrical activity and decrease of the membrane resistance. The NaHS effect was dose-dependent with an EC50 of 152 μM (equals effective H2S of 16-19 μM). NaHS effects were not altered after inhibition of maxi conductance calcium-activated potassium (BK) channels by tetraethylammonium or paxilline, but were significantly reduced after inhibition or activation of ATP-dependent potassium channels (KATP) by glibenclamide or by diazoxide, respectively. In whole-cell recordings NaHS increased the amplitude of KATP currents, induced by hyperpolarizing pulses and subsequent application of glibenclamide decreased currents to control levels. Using the fluorescent dye FM 1-43 exocytosis of secretory granules was analyzed in basal and stimulated conditions (high K(+) external solution). Prior application of NaHS decreased the fluorescence of the cell membrane in both conditions which links with activation of KATP currents (basal secretion) and activation of KATP currents and BK-currents (stimulated exocytosis). We suggest that H2S induces hyperpolarization of GH3 cells by activation of KATP channels which results in a truncation of spontaneous action potentials and a decrease of hormone release.

  4. Synergistic Inhibition of Delayed Rectifier K+ and Voltage-Gated Na+ Currents by Artemisinin in Pituitary Tumor (GH3 Cells

    Directory of Open Access Journals (Sweden)

    Edmund Cheung So

    2017-04-01

    Full Text Available Background: Artemisinin (ART is an anti-malarial agent reported to influence endocrine function. Methods: Effects of ART on ionic currents and action potentials (APs in pituitary tumor (GH3 cells were evaluated by patch clamp techniques. Results: ART inhibited the amplitude of delayed-rectifier K+ current (IK(DR in response to membrane depolarization and accelerated the process of current inactivation. It exerted an inhibitory effect on IK(DR with an IC50 value of 11.2 µM and enhanced IK(DR inactivation with a KD value of 14.7 µM. The steady-state inactivation curve of IK(DR was shifted to hyperpolarization by 10 mV. Pretreatment of chlorotoxin (1 µM or iloprost (100 nM did not alter the magnitude of ART-induced inhibition of IK(DR in GH3 cells. ART also decreased the peak amplitude of voltage-gated Na+ current (INa with a concentration-dependent slowing in inactivation rate. Application of KMUP-1, an inhibitor of late INa, was effective at reversing ART-induced prolongation in inactivation time constant of INa. Under current-clamp recordings, ART alone reduced the amplitude of APs and prolonged the duration of APs. Conclusion: Under ART exposure, the inhibitory actions on both IK(DR and INa could be a potential mechanisms through which this drug influences membrane excitability of endocrine or neuroendocrine cells appearing in vivo.

  5. Hypothalamic corticotropin-releasing factor immunoreactivity is reduced during induction of pituitary tumors by chronic estrogen treatment

    Energy Technology Data Exchange (ETDEWEB)

    Haas, D.A.; Borgundvaag, B.; Sturtridge, W.C.; George, S.R.

    1987-11-02

    The role that estrogen plays in the regulation of corticotropin-releasing factor (CRF) is not known. A radioimmunoassay specific for rat CRF was utilized to measure the CRF-like immunoreactivity (CRF-ir) in the hypothalamus of ovariectomized rats treated with estradiol for periods up to 12 weeks. Compared to ovariectomized controls, estradiol treatment resulted in significantly reduced CRF-ir after 3 and 12 weeks, although no significant change was seen after 8 weeks. Anterior pituitary (AP) weight was greatly increased by estradiol treatment at all time points studied. Bromocriptine treatment for the last 3 weeks of the 12-week period, or removal of estradiol for 3 weeks after 9 weeks of treatment did not reverse the changes in CRF-ir even though significant regressions of tumor size was achieved. There was no correlation between AP weight and CRF-ir in individual animals. These data show that chronic treatment with estrogen reduced hypothalamic CRF-ir content. Neither a direct estrogenic effect or an indirect effect mediated through alterations in the adenohypophysis could be ruled out. 21 references, 3 figures.

  6. [Effect of transcutaneous acupoint electric stimulation on perioperative intravenous anesthesia in patients of transsphenoidal pituitary tumor resection].

    Science.gov (United States)

    Chen, Xue; Wang, Bao-Guo; Li, Jin; An, Li-Xin

    2013-08-01

    To observe the impacts of transcutaneous acupoint electric stimulation on hemodynamics, anesthetic and relevant complications in patients of transsphenoidal pituitary tumor resection (TPTR). Ninety cases of the selective TPTR were randomized into a transcutaneous acupoint electric stimulation group (group T), a sham-acupoint group (group S) and a control group (group C); 30 cases in each one. In group T, the transcutaneous acupoint electric stimulation at Hegu (LI 4), Waiguan (TE 5), Jinmen (BL 63), Taichong (LR 3), Zusanli (ST 36) and Qiuxu (GB 40). In group S, the transcutaneous acupoint electric stimulation was applied to the sham-acupoints. In group C, the acupoints selected were same as those in group T, but the electrode pads were just attached on the related points with no-electric stimulation. The electric stimulation lasted from analgesic induction till the end of the operation. The endotracheal intubation was done under the induction by propofol, fentanyl and vecuronium bromide. Propofol and remifentanil were maintained till the end of operation. Blood pressure, heart rate, bispectral index (BIS) value, anesthetic and postoperative recovery situation were recorded. The hemodynamics maintained stably in each group. In group T, the mean arterial pressure 1 min after intubation, after extubation and during directional force recovery was all lower than the other two groups respectively (all Pelectric stimulation improves the stability of hemodynamics in perioperative stage, reduces the intraoperative opi oids dosages and improves the quality of anesthetic recovery.

  7. Pituitary Tumor-Transforming Gene 1 Is Expressed in Primary Ductal Breast Carcinoma, Lymph Node Infiltration, and Distant Metastases

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    Fabio Grizzi

    2013-01-01

    Full Text Available Despite the advances that have been made in the fields of molecular and cell biology, there is still considerable debate explaining how the breast cancer cells progress through carcinogenesis and acquire their metastatic ability. The lack of preventive methods and effective therapies underlines the pressing need to identify new biomarkers that can aid early diagnosis and may be targets for effective therapeutic strategies. In this study we explore the pituitary tumor-transforming gene 1 (PTTG1 expression in primary ductal breast carcinoma, lymph node infiltration, and distant metastases. Three human cell lines, 184B5 derived from normal mammary epithelium, HCC70 from a primary ductal carcinoma, and MDA-MB-361 from a breast metastasis, were used for quantifying PTTG1 mRNA expression. The PTTG1 immunohistochemical expression was carried out on specimens taken from eight patients with invasive ductal breast cancer who underwent surgical treatment and followup for five years retrospectively selected. The study demonstrated that PTTG1 is expressed gradually in primary ductal breast carcinoma, lymph node infiltration, and distant metastases. Our findings suggest that the immunohistochemical evaluation of PTTG1 expression might be a powerful biomarker of recognition and quantification of the breast cancer cells in routine pathological specimens and a potential target for developing an effective immunotherapeutic strategy for primary and metastatic breast cancer.

  8. Caveolin-1 sensitizes rat pituitary adenoma GH3 cells to bromocriptine induced apoptosis

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    Huang Mu-Chiou

    2007-03-01

    Full Text Available Abstract Background Prolactinoma is the most frequent pituitary tumor in humans. The dopamine D2 receptor agonist bromocriptine has been widely used clinically to treat human breast tumor and prolactinoma through inhibition of hyperprolactinemia and induction of tumor cell apoptosis, respectively, but the molecular mechanism of bromocriptine induction of pituitary tumor apoptosis remains unclear. Caveolin-1 is a membrane-anchored protein enriched on caveolae, inverted flask-shaped invaginations on plasma membranes where signal transduction molecules are concentrated. Currently, caveolin-1 is thought to be a negative regulator of cellular proliferation and an enhancer of apoptosis by blocking signal transduction between cell surface membrane receptors and intracellular signaling protein cascades. Rat pituitary adenoma GH3 cells, which express endogenous caveolin-1, exhibit increased apoptosis and shrinkage after exposure to bromocriptine. Hence, the GH3 cell line is an ideal model for studying the molecular action of bromocriptine on prolactinoma. Results The expression of endogenous caveolin-1 in GH3 cells was elevated after bromocriptine treatment. Transiently expressed mouse recombinant caveolin-1 induced apoptosis in GH3 cells by enhancing the activity of caspase 8. Significantly, caveolin-1 induction of GH3 cell apoptosis was sensitized by the administration of bromocriptine. Phosphorylation of caveolin-1 at tyrosine 14 was enhanced after bromocriptine treatment, suggesting that bromocriptine-induced phosphorylation of caveolin-1 may contribute to sensitization of apoptosis in GH3 cells exposed to bromocriptine. Conclusion Our results reveal that caveolin-1 increases sensitivity for apoptosis induction in pituitary adenoma GH3 cells and may contribute to tumor shrinkage after clinical bromocriptine treatment.

  9. [Prognostic implications of folliculo-stellate cells in pituitary adenomas: relationship with tumoral behavior].

    Science.gov (United States)

    Tortosa, F; Pires, M; Ortiz, S

    2016-10-01

    Introduccion. A pesar del progreso en la comprension de su patogenia, no se ha encontrado ningun marcador predictivo independiente del comportamiento agresivo de los adenomas hipofisarios que facilite el tratamiento y seguimiento de pacientes afectados. Objetivo. Analizar la expresion de celulas foliculo-estrelladas, mediante inmunomarcacion con proteina S-100, en una serie de pacientes con adenomas hipofisarios seguidos durante al menos siete años. Pacientes y metodos. Estudio retrospectivo de 51 pacientes diagnosticados de adenoma hipofisario entre 2006 y 2008, segun los criterios vigentes de la Organizacion Mundial de la Salud. Se evaluo inmunohistoquimicamente la expresion de S-100 en celulas foliculo-estrelladas, y se correlaciono con parametros clinicorradiologicos e histopatologicos del tumor y la progresion/recurrencia postoperatoria. Resultados. De 51 tumores, 40 se clasificaron como adenomas hipofisarios tipicos y 11 como atipicos. La mayoria de los tipicos mostro celulas foliculo-estrelladas positivas para S-100 (media: 3,93%); los atipicos tenian pocas o ninguna celula S-100 positivas (media: 0,83%). No hubo diferencias significativas en la expresion de S-100 con respecto a la edad o sexo del paciente, tamaño, invasividad o recidiva tumoral posquirurgica. Conclusiones. En el grupo de estudio, a excepcion de los adenomas no funcionantes inmunopositivos para prolactina, con la media mas baja y mas alta de todos los subtipos en ambos grupos (tipicos, 0,25%, frente a atipicos, 9,24%; p = 0,0028), el factor predictivo de agresividad tumoral para los adenomas hipofisarios no esta representado por un bajo valor de S-100 en las celulas foliculo-estrelladas, lo que no permite seleccionar a pacientes para un tratamiento postoperatorio intensivo.

  10. Development of cystic glandular hyperplasia of the endometrium in Mullerian inhibitory substance type II receptor-pituitary tumor transforming gene transgenic mice.

    Science.gov (United States)

    El-Naggar, Shahenda M; Malik, Mohammad T; Martin, Alvin; Moore, Joseph P; Proctor, Mary; Hamid, Tariq; Kakar, Sham S

    2007-07-01

    The pituitary tumor transforming gene (PTTG)/securin is an oncogene that is involved in cell cycle regulation and sister chromatid separation. PTTG is highly expressed in various tumors including ovarian tumors, suggesting that PTTG may play a role in ovarian tumorigenesis. Overexpression of PTTG resulted in induction of cellular transformation in vitro and tumor formation in nude mice. To ascertain PTTG function in ovarian tumorigenesis, we generated a transgenic mouse model of PTTG by cloning PTTG cDNA downstream of Mullerian inhibitory substance type II receptor gene promoter (MISIIR) in order to target the ovarian surface epithelium. By screening of transgenic animals, we identified five founders (four males and one female). Using the four male founders, we developed four transgenic lines. PTTG expression was increased in ovarian surface epithelium, ovarian granulosa cells, as well as in the pituitary gland. Transgenic females did not develop any visible ovarian tumors at 8-10 months of age; however, there was an overall increase in the corpus luteum mass in transgenic ovary, suggesting increased luteinization. These changes were associated with an increase in serum LH and testosterone levels. In addition, there was a generalized hypertrophy of the myometrium of MISIIR-PTTG transgenic uteri with cystic glandular and hyperplasia of the endometrium. Based on these results, we conclude that the overexpression of PTTG may be required to initiate precancerous conditions but is not sufficient to induce ovarian tumorigenesis and may require another partner to initiate cellular transformation.

  11. Diagnosis and treatment of pituitary adenomas.

    Science.gov (United States)

    Chanson, P; Salenave, S

    2004-12-01

    Pituitary tumors cause symptoms by secreting hormones (prolactin, PRL, responsible for amenorrhea-galactorrhea in women and decreased libido in men; growth hormone, GH, responsible for acromegaly; adrenocorticotropic hormone, ACTH, responsible for Cushing's syndrome; thyroid-stimulating hormone, TSH, responsible for hyperthyroidism), depressing the secretion of hormones (hypopituitarism), or by mass-related effects (headaches, visual field abnormalities...). All patients with pituitary tumors should be evaluated for gonadal, thyroid and adrenal function as well as PRL and GH secretion. Specific stimulation and suppression tests for pituitary hormones are performed in selected situations for detecting the type of hypersecretion or the response to treatment. Imaging procedures (mainly magnetic resonance imaging, MRI, nowadays) determine the presence, size and extent of the lesion. The classification of pituitary tumors is based on the staining properties of the cell cytoplasm viewed by light microscopy and immunocytochemistry revealing the secretory pattern of the adenoma. Treatment of pituitary adenomas consists of surgery (performed in more than 99% of cases via a transphenoidal route) and radiotherapy, generally fractionated or, in selected cases, using stereotactic techniques such as gamma-knife. The availability of medical treatment (dopamine, DA, agonists, somatostatin analogs, GH-receptor antagonists...) has profoundly modified the indications of radiotherapy, drugs being now generally used as a second-line treatment, after surgery (or even as first-line treatment). Based on the results of the different treatment modalities for each type of pituitary adenoma, recommendations will be proposed. They may be summarized as follows. For treatment of GH-secreting adenomas, trans-sphenoidal surgery is the first-line therapy except when the macroadenoma is giant or if surgery is contra-indicated; postoperative radiation therapy (fractionated, or by gamma-knife) is

  12. SUNCT syndrome associated with pituitary tumor: case report Síndrome SUNCT associada a tumor de hipófise: relato de caso

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    Pedro A.S. Rocha Filho

    2006-06-01

    Full Text Available For twelve years, the subject of this report, a 38-year-old man, presented a clinical condition compatible with the SUNCT (short-lasting unilateral neuralgiform headache attacks with conjunctival injection and tearing syndrome. He presented a stabbing and intense daily pain located in the left pre-auricular and temporal regions. Each of these intense pain attacks lasted around one minute and presented a frequency of two to eight times per day. The pain was associated with ipsilateral lacrimation, conjunctival injection and rhinorrhea. MRI revealed a pituitary tumor with little suprasellar extent. The subject’s serial assays of prolactin, GH, TSH and ACTH were within normal levels. Following transsphenoidal hypophysectomy, with complete removal of the tumor, the subject no more presented pain. The pathological diagnosis was non-secreting adenoma. Fourteen months after the surgery, he remains symptom-free.O paciente relatado neste artigo apresentou uma condição clínica compatível com síndrome SUNCT (cefaléia de curta duração, unilateral, neuralgiforme com hiperemia conjuntival e lacrimejamento. Ele referia dor diária, intensa, em facada, localizada na região pré-auricular e temporal esquerdas. Cada ataque de dor permanecia por cerca de um minuto, com freqüência de duas a oito vezes por dia. A dor se acompanhava de lacrimejamento ipsolateral, congestão conjuntival e rinorréia. A RM mostrou um tumor de hipófise com pouca extensão suprasselar. Dosagens de prolactina, GH, TSH e ACTH estavam em níveis normais. Foi então submetido a hipofisectomia transesfenoidal com remoção completa do tumor após o que a dor cessou completamente. O diagnóstico anátomo-patológico foi adenoma não secretor. Quatorze meses após a cirurgia, o paciente permanecia livre de dor.

  13. ZAC1 and SSTR2 are downregulated in non-functioning pituitary adenomas but not in somatotropinomas.

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    Leonardo Vieria Neto

    Full Text Available INTRODUCTION: There are few data regarding ZAC1 expression in clinically non-functioning pituitary adenomas (NFPA. Because somatotropinomas and NFPA behave differently with respect to tumor shrinkage during somatostatin analogs (SA therapy, we sought to compare the ZAC1 and somatostatin receptor (sstr types 1, 2, 3 and 5 mRNA expression in these two pituitary adenoma subtypes and in normal human pituitaries. METHODS: ZAC1 and SSTR mRNA expression levels were evaluated using real-time RT-PCR (TaqMan in 20 NFPA and compared with the expression levels in 23 somatotropinomas and five normal pituitaries. The NFPA invasiveness was evaluated using magnetic resonance imaging with Hardy's modified criteria. Ki-67 and p53 were evaluated using immunohistochemistry. RESULTS: A total of 20 patients with NFPA [6 males, median age 56 years (range: 30-78], 23 with acromegaly [12 males, median age 43 years (range: 24-57] and five normal pituitaries [4 males, median age 48 years (range: 36-54] were included. Four of the patients (20% had Hardy's grade 2 tumors; all of the others had Hardy's grade 3 tumors. The Ki-67 median expression was 2.35 (range: 0.2-9.23, and only four of the tumors (20% were positive for p53. The ZAC1 mRNA expression was significantly lower in NFPA than in somatotropinomas and in normal pituitaries (p<0.001 for both, as well as the SSTR2 (p=0.001 and 0.01, respectively. The SSTR3 expression was higher in the NFPA than in the somatotropinomas and in the normal pituitaries (p=0.03 and 0.02, respectively. No correlation was found between the ZAC1 mRNA expression and the tumor invasiveness, Ki-67 and p53. CONCLUSION: ZAC1 and SSTR2 are underexpressed and SSTR3 is overexpressed in NFPA compared to those in somatotropinomas and in normal pituitaries, which might explain the lack of tumor shrinkage that is observed in response to commercially available SA therapy in patients with NFPA.

  14. Selective use of peri-operative steroids in pituitary tumor surgery: escape from dogma

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    Jacqueline Marie Regan

    2013-03-01

    Full Text Available Objective: Traditional neurosurgical practice calls for administration of peri-operative stress-dose steroids for sellar-suprasellar masses undergoing operative treatment. This practice is considered critical to prevent peri-operative complications associated with hypoadrenalism, such as hypotension and circulatory collapse. However, stress-dose steroids complicate the management of these patients. It has been our routine practice to use stress steroids during surgery only if the patient has clinical or biochemical evidence of hypocortisolism pre-operatively. We wanted to be certain that this practice was safe.Methods: We present our retrospective analysis from a consecutive series of 114 operations in 109 patients with sellar and/or suprasellar tumors, the majority of whom were managed without empirical stress-dose steroid coverage. Only patients who were hypoadrenal pre-operatively or who had suffered apoplexy were given stress dose coverage during surgery. We screened for biochemical evidence of hypoadrenalism as a result of surgery by measuring immediate post-operative AM serum cortisol levels.Results: There were no adverse events related to the selective use of cortisol replacement in this patient population. Conclusions: Our experience demonstrates that selective use of corticosteroid replacement is safe; it simplifies the management of the patients, and has advantages over empiric dogmatic steroid coverage.

  15. Alteration of Pituitary Tumor Transforming Gene-1 Regulates Trophoblast Invasion via the Integrin/Rho-Family Signaling Pathway.

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    Seung Mook Lim

    Full Text Available Trophoblast invasion ability is an important factor in early implantation and placental development. Recently, pituitary tumor transforming gene 1 (PTTG1 was shown to be involved in invasion and proliferation of cancer. However, the role of PTTG1 in trophoblast invasion remains unknown. Thus, in this study we analyzed PTTG1 expression in trophoblasts and its effect on trophoblast invasion activity and determined the mechanism through which PTTG1 regulates trophoblast invasion. Trophoblast proliferation and invasion abilities, regardless of PTTG1 expression, were analyzed by quantitative real-time polymerase chain reaction, fluorescence-activated cell sorting analysis, invasion assay, western blot, and zymography after treatment with small interfering RNA against PTTG1 (siPTTG1. Additionally, integrin/Rho-family signaling in trophoblasts by PTTG1 alteration was analyzed. Furthermore, the effect of PTTG1 on trophoblast invasion was evaluated by microRNA (miRNA mimic and inhibitor treatment. Trophoblast invasion was significantly reduced through decreased matrix metalloproteinase (MMP-2 and MMP-9 expression when PTTG1 expression was inhibited by siPTTG1 (p < 0.05. Furthermore, knockdown of PTTG1 increased expression of integrin alpha 4 (ITGA4, ITGA5, and integrin beta 1 (ITGB1; otherwise, RhoA expression was significantly decreased (p < 0.05. Treatment of miRNA-186-5p mimic and inhibitor controlled trophoblast invasion ability by altering PTTG1 and MMP expression. PTTG1 can control trophoblast invasion ability via regulation of MMP expression through integrin/Rho-family signaling. In addition, PTTG1 expression and its function were regulated by miRNA-186-5p. These results help in understanding the mechanism through which PTTG1 regulates trophoblast invasion and thereby implantation and placental development.

  16. DIAGNOSIS AND TREATMENT OF THE PITUITARY METASTASES

    Institute of Scientific and Technical Information of China (English)

    连伟; 任祖渊; 苏长保

    2004-01-01

    Thee cases of pituitary metastases were reported. They all had operations and the pathological examination confirming the diagnosis. The clinical features of diabetes insipidus and extraocular nerve palsy were presented. In two cases, the original tumors were bronchioloalveolar carcinoma; in the other one, the original tumor was unknown. All three cases had poor outcome. These cases illustrate the fact that a pituitary metastasis can closely mimic a pituitary benign tumor, such as pituitary adenoma. Especially in the presence of suggestive symptoms such as diabetes insipidus and/or cranical nerve paralysis, the possibility of metastatic disease in the differential diagnosis of a pituitary mass should always be considered.

  17. 垂体瘤切除术后低钠血症32例分析%Clinical Analysis of Postoperative Hyponatremia of Pituitary Tumor In 32 patients

    Institute of Scientific and Technical Information of China (English)

    高建洲; 常祥平; 陈亢实; 潘乐坤; 孔昕

    2009-01-01

    Objective To explore clinical treatment of postoperative hyponatremia of pituitary tumor. Meth-ods 32 cases of patients with postoperative hyponatremia of pituitary tumor were randomly divided into control group and treatment group. The control group(n = 15) was treated with routine western medicine, and the treatment group(n = 17) was treated with water limited and sodium supplemented based on the control group. The clinical effect was observed between control group and treatment group. Results The clinical effect in the treatment group was signifi-cantly higher than that of the control group(P <0.05). Conclusion The treatment of water limited and sodium sup-plemented on postoperative hyponatremia of pituitary tumor is better.%目的 探讨垂体瘤切除术后低钠血症的临床处理方法 .方法 32例垂体瘤切除术后低钠血症患者,随机分为对照组(n=15)和治疗组(n=17),其中对照组予以西医常规处理,治疗组在对照组基础上限水补钠,比较两组患者的临床疗效.结果 治疗组临床疗效明显高于对照组(P<0.05).结论 应用限水补钠对垂体瘤切除术后低钠血症的治疗效果好.

  18. Effect of a long-acting somatostatin analogue (SMS 201-995 on a growth hormone and thyroid stimulating hormone-producing pituitary tumor.

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    Hirasawa,Ryoto

    1991-04-01

    Full Text Available A 46-year-old woman with acromegaly and hyperthyroidism due to a pituitary adenoma. She had high serum thyroid-stimulating hormone (TSH levels and very high serum growth hormone (GH levels. Transsphenoidal removal of the tumor, post-operative irradiation, frontal craniotomy for removal of residual tumor and large-dose bromocriptine therapy were carried out consecutively. After therapy, serum GH levels gradually decreased, but not to the normal range, and serum TSH levels remained at inappropriately normal levels. Using immunoperoxidase techniques, GH-, TSH- and follicle-stimulating hormone (FSH-containing cells were demonstrated in the adenoma. A long-acting somatostatin analogue (SMS 201-995, 600 micrograms/day suppressed the serum GH level to the normal range with a concomitant suppression of TSH. Furthermore, the paradoxical serum GH responses to TRH and LH-RH were slightly improved. No important subjective side-effects were noted. Therefore, SMS 201-995 appeared to be a very effective drug in this patient with a GH- and TSH-producing pituitary tumor.

  19. Intrasellar pituitary mucocele: diagnostic dilemma.

    Science.gov (United States)

    Tang, Ing Ping; Chai, Chun Kian; Kumar, Gnana; Prepageran, Narayanan; Waran, Vicknes

    2014-06-01

    Isolated intrasellar pituitary mucocele following transsphenoidal sinus surgery is extremely rare. The clinical features resemble a pituitary tumor, therefore careful radiological interpretation is crucial to reach the correct diagnosis. We report a case of intrasellar mucocele who had transsphenoidal sinus surgery performed 15 years prior.

  20. Genetics Home Reference: familial isolated pituitary adenoma

    Science.gov (United States)

    ... named? Additional Information & Resources MedlinePlus (6 links) Encyclopedia: Acromegaly Encyclopedia: Gigantism Encyclopedia: Pituitary Tumor Encyclopedia: Prolactinoma Health Topic: Endocrine ...

  1. Pituitary Tumors Fact Sheet

    Science.gov (United States)

    ... include fatigue, dizziness, dry skin, irregular periods in women, and sexual dysfunction in men. Other symptoms depend on the hormone ... can cause irregular or absent menstrual periods in women. They can also cause a ... dysfunction and breast enlargement. These conditions can have serious ...

  2. Pituitary tumor evaluation

    Energy Technology Data Exchange (ETDEWEB)

    Albertson, B.; Binney, S.

    1995-11-01

    This paper describes research on the following: the structure of {sup 10}B{sub 10}-ovine corticotropin releasing hormone and {sup 10}B{sub 10}-growth hormone releasing hormone; the BNCT effect on AtT-20 cell {sup 10}B{sub 10}-CRH incubations in vitro; BNCT effects on GH{sub 4}C{sub 1} cell {sup 10}B{sub 10} growth hormone releasing factor incubation in vitro; and competitive inhibition of AtT-20 cell BNCT effect.

  3. Stages of Pituitary Tumors

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    ... reflexes work. This may also be called a neuro exam or a neurologic exam. MRI (magnetic resonance ... Websites POLICIES Accessibility Comment Policy Disclaimer FOIA Privacy & Security Reuse & Copyright Syndication Services Website Linking U.S. Department ...

  4. Influência dos níveis de prolactina e tamanho tumoral na função hipofisária pós-operatória em macroadenomas hipofisários clinicamente não-funcionantes Influence of hyperprolactinemia and tumoral size in the postoperative pituitary function in clinically nonfuncioning pituitary macroadenomas

    Directory of Open Access Journals (Sweden)

    Ana Luiza Vidal Fonseca

    2002-09-01

    Full Text Available OBJETIVO: Estudar a influência da hiperprolactinemia e de tamanho tumoral na função hipofisária em macroadenomas hipofisários clinicamente não funcionantes. MÉTODOS: Foram analisados 23 pacientes com macroadenomas hipofisários clinicamente não funcionantes, com exames de imagem (tomografia computadorizada ou ressonância magnética e dosagens hormonais basais; 16 tinham provas de função hipotálamo-hipofisária (megateste pré-operatórios. Todos os tumores tiveram diagnóstico histológico e em 17 foi realizado também estudo imuno-histoquímico para os hormônios adeno-hipofisários. A análise estatística foi feita por meio dos testes t de Student, qui-quadrado, exato de Fisher e de Mc Neman. O nível de significância adotado foi 5% (pOBJECTIVE: To study the influence of hyperprolactinemia and tumoral size in the pituitary function in clinically nonfuncioning pituitary macroadenomas. METHODS: Twenty three patients with clinically nonfuncioning pituitary macroadenomas were evaluated by image studies (computed tomography or magnetic resonance and basal hormonal level; 16 had preoperative hypothalamus-hypophysial function tests (megatests. All tumors had histological diagnosis and in seventeen immunohistochemical study for adenohypophysial hormones was also performed. Student's t test, chi square test, exact test of Fisher and Mc Neman test were used for the statistics analysis . The level of significance adopted was 5% (p<0.05. RESULTS: Tumoral diameter varied of 1.1 to 4.7 cm (average=2.99 cm ± 1.04. In the preoperative, 5 (21.7% patients did not show laboratorial hormonal deficit, 9 (39.1% developed hyperprolactinemia, 13 (56,5% normal levels of prolactin (PRL and 1 (4.3% subnormal; 18 (78.3% patients developed hypopituitarism (4 pan-hypopituitarism. Nineteen patients (82.6% underwent transsfenoidal approach, 3 (13% craniotomy and 1 (4.4% combined access. Only 6 patients had total tumoral resection. Of the 17 immunohistochemical

  5. Multimodal Navigation in Endoscopic Transsphenoidal Resection of Pituitary Tumors Using Image-Based Vascular and Cranial Nerve Segmentation: A Prospective Validation Study.

    Science.gov (United States)

    Dolati, Parviz; Eichberg, Daniel; Golby, Alexandra; Zamani, Amir; Laws, Edward

    2016-11-01

    Transsphenoidal surgery (TSS) is the most common approach for the treatment of pituitary tumors. However, misdirection, vascular damage, intraoperative cerebrospinal fluid leakage, and optic nerve injuries are all well-known complications, and the risk of adverse events is more likely in less-experienced hands. This prospective study was conducted to validate the accuracy of image-based segmentation coupled with neuronavigation in localizing neurovascular structures during TSS. Twenty-five patients with a pituitary tumor underwent preoperative 3-T magnetic resonance imaging (MRI), and MRI images loaded into the navigation platform were used for segmentation and preoperative planning. After patient registration and subsequent surgical exposure, each segmented neural or vascular element was validated by manual placement of the navigation probe or Doppler probe on or as close as possible to the target. Preoperative segmentation of the internal carotid artery and cavernous sinus matched with the intraoperative endoscopic and micro-Doppler findings in all cases. Excellent correspondence between image-based segmentation and the endoscopic view was also evident at the surface of the tumor and at the tumor-normal gland interfaces. Image guidance assisted the surgeons in localizing the optic nerve and chiasm in 64% of cases. The mean accuracy of the measurements was 1.20 ± 0.21 mm. Image-based preoperative vascular and neural element segmentation, especially with 3-dimensional reconstruction, is highly informative preoperatively and potentially could assist less-experienced neurosurgeons in preventing vascular and neural injury during TSS. In addition, the accuracy found in this study is comparable to previously reported neuronavigation measurements. This preliminary study is encouraging for future prospective intraoperative validation with larger numbers of patients. Copyright © 2016 Elsevier Inc. All rights reserved.

  6. The influence of the pituitary tumor transforming gene-1 (PTTG-1 on survival of patients with small cell lung cancer and non-small cell lung cancer

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    Geddert Helene

    2006-01-01

    Full Text Available Abstract Background PTTG-1 (pituitary tumor transforming gene is a novel oncogene that is overexpressed in tumors, such as pituitary adenoma, breast and gastrointestinal cancers as well as in leukemia. In this study, we examined the role of PTTG-1 expression in lung cancer with regard to histological subtype, the correlation of PTTG-1 to clinical parameters and relation on patients' survival. Methods Expression of PTTG-1 was examined immunohistochemically on formalin-fixed, paraffin-embedded tissue sections of 136 patients with small cell lung cancer (SCLC and 91 patients with non-small cell lung cancer (NSCLC, retrospectively. The intensity of PTTG-1 expression as well as the proportion of PTTG-1 positive cells within a tumor was used for univariate and multivariate analysis. Results PTTG-1 expression was observed in 64% of SCLC tumors and in 97.8% of NSCLC tumors. In patients with SCLC, negative or low PTTG-1 expression was associated with a shorter mean survival time compared with patients with strong PTTG-1 expression (265 ± 18 days vs. 379 ± 66 days; p = 0.0291. Using the Cox regression model for multivariate analysis, PTTG-1 expression was a significant predictor for survival next to performance status, tumor stage, LDH and hemoglobin. In contrast, in patients with NSCLC an inverse correlation between survival and PTTG-1 expression was seen. Strong PTTG-1 expression was associated with a shorter mean survival of 306 ± 58 days compared with 463 ± 55 days for those patients with no or low PTTG-1 intensities (p = 0.0386. Further, PTTG-1 expression was associated with a more aggressive NSCLC phenotype with an advanced pathological stage, extensive lymph node metastases, distant metastases and increased LDH level. Multivariate analysis using Cox regression confirmed the prognostic relevance of PTTG-1 expression next to performance status and tumor stage in patients with NSCLC. Conclusion Lung cancers belong to the group of tumors expressing

  7. Tumorigenic potential of pituitary tumor transforming gene (PTTG in vivo investigated using a transgenic mouse model, and effects of cross breeding with p53 (+/− transgenic mice

    Directory of Open Access Journals (Sweden)

    Fong Miranda Y

    2012-11-01

    Full Text Available Abstract Background Pituitary tumor-transforming gene (PTTG is an oncogene that is overexpressed in variety of tumors and exhibits characteristics of a transforming gene. Previous transgenic mouse models to access the tumorigenic potential in the pituitary and ovary have resulted in dysplasia without formation of visible tumors, possibly due to the insufficient expression of PTTG. PTTG expression level is critical for ovarian tumorigenesis in a xenograft model. Therefore, the tumorigenic function of PTTG in vivo remains unclear. We generated a transgenic mouse that overexpresses PTTG driven by the CMV promoter to determine whether PTTG functions as a transforming oncogene that is capable of initiating tumorigenesis. Methods Transgenic animals were generated by microinjection of PTTG transgene into the male pronucleus of FVB 0.5 day old embryos. Expression levels of PTTG in tissues of transgenic animals were analyzed using an immunohistochemical analysis. H&E staining and immunohistostaining were performed to examine the type of tumor in transgenic and PTTG transgenic/p53+/- animals. Results PTTG transgenic offspring (TgPTTG were monitored for tumor development at various ages. H&E analysis was performed to identify the presence of cancer and hyperplastic conditions verified with the proliferation marker PCNA and the microvessel marker CD31. Immunohistochemistry was performed to determine transgene expression, revealing localization to the epithelium of the fallopian tube, with more generalized expression in the liver, lung, kidney, and spleen. At eight months of age, 2 out of 15 TgPTTG developed ovarian cancer, 2 out of 15 developed benign tumors, 2 out of 15 developed cervical dysplasia, and 3 out of 15 developed adenomyosis of the uterus. At ten months of age, 2 out of 10 TgPTTG developed adenocarcinoma of the ovary, 1 out of 10 developed a papillary serous adenocarcinoma, and 2 out of 10 presented with atypia of ovarian epithelial cells

  8. Radiosurgery for pituitary adenomas: evaluation of its efficacy and safety

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    Canteras Miguel M

    2010-11-01

    Full Text Available Abstract Object To assess the effects of radiosurgery (RS on the radiological and hormonal control and its toxicity in the treatment of pituitary adenomas. Methods Retrospective analysis of 42 patients out of the first 48 consecutive patients with pituitary adenomas treated with RS between 1999 and 2008 with a 6 months minimum follow-up. RS was delivered with Gamma Knife as a primary or adjuvant treatment. There were 14 patients with non-secretory adenomas and, among functioning adenomas, 9 were prolactinomas, 9 were adrenocorticotropic hormone-secreting and 10 were growth hormone-secreting tumors. Hormonal control was defined as hormonal response (decline of more than 50% from the pre-RS levels and hormonal normalization. Radiological control was defined as stasis or shrinkage of the tumor. Hypopituitarism and visual deficit were the morbidity outcomes. Hypopituitarism was defined as the initiation of any hormone replacement therapy and visual deficit as loss of visual acuity or visual field after RS. Results The median follow-up was 42 months (6-109 months. The median dose was 12,5 Gy (9 - 15 Gy and 20 Gy (12 - 28 Gy for non-secretory and secretory adenomas, respectively. Tumor growth was controlled in 98% (41 in 42 of the cases and tumor shrinkage ocurred in 10% (4 in 42 of the cases. The 3-year actuarial rate of hormonal control and normalization were 62,4% and 37,6%, respectively, and the 5-year actuarial rate were 81,2% and 55,4%, respectively. The median latency period for hormonal control and normalization was, respectively, 15 and 18 months. On univariate analysis, there were no relationships between median dose or tumoral volume and hormonal control or normalization. There were no patients with visual deficit and 1 patient had hypopituitarism after RS. Conclusions RS is an effective and safe therapeutic option in the management of selected patients with pituitary adenomas. The short latency of the radiation response, the highly

  9. [Two autopsy cases of primary pituitary carcinoma].

    Science.gov (United States)

    Negishi, K; Suzuki, T; Masuda, Y; Masugi, Y; Teramoto, A; Ohama, E

    1988-05-01

    We studied two autopsy cases of primary pituitary carcinoma. Case-1. A 45 year old female was admitted on Oct. 4 1978, with a complaint of right homonymous hemianopsia. And diagnosis was pituitary adenoma. Partial removal of pituitary tumor was performed on Oct. 23 1978. She died on Dec. 5 1978 due to bleeding of gastrointestinal tract. Autopsy disclosed a pituitary carcinoma invading the left hypothalamus, mamillary body, optic and V cranial nerves, and mid brain as well as sphenoid bone. No extracranial metastasis was noted. Case-2. A 44 year old female with a history of acromegaly for 6 years was admitted with a complaint of headache on May 8 1976. She was diagnosed as having pituitary adenoma. The subtotal removal of pituitary tumor was performed on May 21 1976 and followed by 4500 rad irradiation. At this time, pathological diagnosis was eosinophilic adenoma. Seven years later, she complained of progressive right hearing disturbance, dysarthria and ataxic gait 1983. The second subtotal removal of pituitary tumor was performed with a diagnosis of recurrence of pituitary adenoma on Oct. 7 1983. After the operation, she complicated sepsis and died on Jan. 14 1984. An autopsy disclosed a pituitary carcinoma from residual pituitary gland, continuously extending to the subarachnoid space of the pons, and invading right cerebello-pontine angle and cerebellum. The histological examination revealed pituitary carcinoma with high pleomorphism and glioblastoma multiform-like feature were within the tumor.(ABSTRACT TRUNCATED AT 250 WORDS)

  10. 垂体瘤手术及其并发症的防治%Clinical analysis of pituitary tumor operation and complication prevention

    Institute of Scientific and Technical Information of China (English)

    阳永东; 周晓坤; 杜怡庆; 王文波; 唐乐建

    2013-01-01

    Objective To retrospectively analyze and record the operation method of transsphenoidal approach for the treatment of pituitary tumors and complications,and put forward the prevention and treatment of complications strategies according to the clinical experience.Methods 256 cases of pituitary tumor patients with transsphenoidal operation resection of the tumor treatment,postoperative complications,and with Chen Longyi in 2010 reported results of a comparative analysis.Results 256 cases of patients with diabetes insipidus and cerebrospinal fluid leakage incidence was significantly lower than Chen Long-yi's Group (P < 0.01) ; other complications include water and electrolyte disorders,secondary hemorrhage,visual impairment worsened,hypothalamic function disorder,ophthalmoplegia and death,the two groups had no significant difference (P > 0.05).Conclusions More complications of pituitary tumor after operation,clinical should emphasize the operation method of operation,a clear approach,fit,and doctors should improve their own responsibility,to summarize the clinical experience,effective prevention and treatment of complications.%目的 分析经蝶入路治疗垂体瘤手术方法及并发症发生情况,提出并发症防治策略.方法 256例垂体瘤患者行经蝶入路手术切除肿瘤治疗,术后观察并发症发生情况,并与文献报道结果进行比较分析.结果 256例患者尿崩和脑脊液漏发生率明显低于文献报道(P<0.01);其他并发症包括水电解质紊乱、继发性出血、视力障碍加重、下丘脑功能紊乱、眼肌麻痹和死亡等,两组间比较差异无统计学意义(P>0.05).结论 垂体瘤手术后并发症较多,临床应强调手术操作方法、明确入路、适当填充,同时应有效防治并发症.

  11. NI-18MULTIMODAL NAVIGATION IN ENDOSCOPIC TRANS-SPHENOIDAL RESECTION OF PITUITARY TUMORS USING IMAGE-BASED VASCULAR AND CRANIAL NERVE SEGMENTATION: A PROSPECTIVE VALIDATION STUDY

    Science.gov (United States)

    Dolati, Parviz; Raber, Michael; Golby, Alexandra; Laws, Edward

    2014-01-01

    Trans-Sphenoidal surgery (TSS) is a well-known approach for treatment of pituitary tumors. However, in inexperienced hands, the risk of lateral misdirection and vascular damage, intraoperative CSF leakage, and optic nerve injury are all well-known complications of this procedure. This prospective study was conducted to validate the accuracy of image-based segmentation in localization of neurovascular structures during TSS. METHODS: Eight patients with pituitary tumor underwent preoperative 3TMRI, which included thin sectioned 3D space T2, 3D Time of Flight and MPRAGE sequences. Images were reviewed by an expert independent neuroradiologist. Imaging sequences were loaded in BrainLab iPlanNet (6/8) and Stryker (2/8) for segmentation and pre-op planning. After patient registration to the intra-op neuronavigation system and surgical exposure, each segmented neural or vascular element was validated by manual placement of the navigation probe. The pulses of the bilateral ICA were confirmed using micro-Doppler. RESULTS: Pre-operative segmentation of the ICA and cavernous sinus matched with the intra-operative endoscopic and micro-Doppler findings in all cases (Dice-coefficient =1). This information reassured surgeons regarding the lateral extent of bone removal at the sellar floor and the limits of lateral explorations. Perfect correspondence between image-based segmentation and endoscopic view was also found at the surface of the tumor and tumor-normal gland interfaces. This helped in preventing unnecessary removal of the normal pituitary gland. Image-guidance helped surgeon to localize the optic nerve and chiasm in 63% of case and Diaphragma sella in 50% of cases, which helped to determine the limits of upward exploration and decrease the risk of CSF leakage. CONCLUSION: Image-based pre-operative vascular and neural element segmentation especially with 3D reconstruction is highly informative preoperatively and helps young and inexperienced neurosurgeons to prevent

  12. Shift of the pituitary stalk in intrasellar pituitary adenomas

    Energy Technology Data Exchange (ETDEWEB)

    Ito, Jusuke; Tokiguchi, Susumu; Nakamori, Akitoshi (Niigata Univ. (Japan). School of Medicine); Watanabe, Akira; Yokoyama, Motoharu

    1982-08-01

    Fifty-one patients from a group of 344 patients undergoing the evaluation of intrasellar or parasellar tumors were diagnosed on CT as having an intrasellar pituitary adenoma. Axial transverse sections were performed at -10/sup 0/ to Reid's basal line, using 1.5-mm-thick slices and sagittal and coronal reformation. Of these 51 patients, 17 showed a shift of the pituitary stalk. The area where a tumor was thought to be located within the sella turcica on preoperative CT became defective on CT after transsphenoidal surgery in all cases. Histological verification was obtained in all cases. Also, the shift of the pituitary stalk was normalized or markedly improved after surgery in all cases. In functioning tumors, all cases except two showed an endocrinologically normal state or a marked improvement after transsphenoidal surgery. On the basis of the above-mentioned facts, it was concluded that the shift of the pituitary stalk in intrasellar pituitary adenomas indicated the evidence of a mass and its location in the sella turcica. However, a shift of the pituitary stalk was also observed under other conditions, such as empty sella and tuberculum sellae meningioma, and so it is not a pathognomonic finding in intrasellar pituitary adenomas.

  13. EFFECT OF PREOPERATIVE USE OF LONG-ACTING OCTREOTIDE ON GROWTH HORMONE SECRETING PITUITARY ADENOMA AND TRANSSPHENOIDAL SURGERY

    Institute of Scientific and Technical Information of China (English)

    Jian Yin; Chang-bao Su; Zhi-qin Xu; Yi Yang; Wen-bin Ma; Wei Tao; Zhong Yang; Xue-wei Xia

    2005-01-01

    Objective To investigate whether somatostatin analog octreotide long acting release (LAR) shrinks growth hormone (GH) secreting adenomas, and improves the results of subsequent transsphenoidal surgery.Methods Seventeen previously untreated active acromegalic patients with pituitary adenomas were treated with LAR (30 mg intramuscular injection every 28 days) for 3 months prior to transsphenoidal surgery. Clinical reaction, mean GH secretion, and tumor volume were measured under basal conditions and after LAR treatment.Results Presurgical treatment improved acromegaly symptoms and induced a significant reduction of GH under the 5 ng/mL limit in microadenoma (P < 0.05), while only 18.2% (2/11) in macroadenoma. Meanwhile, tumor shrinkage occurred in 58.8% (10/17) patients, with 1 case in the microadenoma group. All marked shrinkage (> 25%) occurred in the macroadenoma group. Statistical analysis showed tumor shrinkage caused by LAR was greater in macroadenoma group than that in microadenoma group (P < 0.05). During operation, adenoma was soft in 15 cases, with the exception of 2cases in which the soft rumor was divided by fibrous septa, but all tumor removal was smooth.Conclusions A short term administration of preoperative LAR may induce a significant decrease in GH-secretion level and adenoma volume. Presurgical use of octreotide LAR improves surgical results especially in macroadenomas.

  14. Colorectal cancer manifesting with metastasis to prolactinoma: report of a case involving symptoms mimicking pituitary apoplexy.

    Science.gov (United States)

    Thewjitcharoen, Yotsapon; Shuangshoti, Shanop; Lerdlum, Sukalaya; Siwanuwatn, Rungsak; Sunthornyothin, Sarat

    2014-01-01

    Pituitary metastasis is an uncommon first presentation of systemic malignancy. The most common presenting symptom of pituitary metastasis is diabetes insipidus reflecting involvement of the stalk and/or posterior pituitary. We herein present a unique case of the coexistence of both a functioning pituitary adenoma (prolactinoma) and pituitary metastasis of advanced colorectal cancer with pituitary apoplexy as the first manifestation of underlying malignancy. The present case emphasizes the need to consider pituitary metastasis as a differential diagnosis in patients presenting with pituitary lesions and be aware that tumor-to-tumor metastasis can occur unexpectedly in those with pituitary metastases.

  15. Prevention Strategies of Pituitary Tumor Surgery and Postoperative Complications%垂体瘤手术与术后并发症的防治策略

    Institute of Scientific and Technical Information of China (English)

    陈爱明

    2016-01-01

    Objective Explore pituitary tumor surgery, treatment and prevention methods of postoperative complications.Methods 20 patients diagnosed as pituitary tumor surgery patients in parallel, take transsphenoidal surgery under a microscope to analyze the effect of surgery and postoperative complications.Results The group of 20 patients with total resection of 13 cases, accounting for 65.0%, partially cut two cases, accounting for 10.0%, subtotal ifve cases, accounting for 25.0%, diabetes insipidus, electrolyte imbalance, decreased vision in 1 case, 1 case of hypopituitarism, cerebrospinal fluid rhinorrhea one case, two cases of other complications.Conclusion Microscope Transsphenoidal treatment of pituitary tumor effect is remarkable, relieve symptoms signiifcantly higher total resection rate, fewer complications, can be used as the ifrst choice of treatment.%目的:探究垂体瘤手术的治疗效果及术后并发症的防治方法。方法选择20例诊断为垂体瘤并行手术的患者,采取显微镜下经蝶入路手术治疗,分析手术效果及术后并发症情况。结果本组20例患者全切13例,占65.0%,部分切2例,占10.0%,次全切5例,占25.0%;尿崩症、电解质紊乱、视力下降各1例,垂体功能低下1例,脑脊液鼻漏1例,其他并发症2例。结论显微镜经蝶入路手术治疗垂体瘤效果显著,患者的症状缓解显著,全切率较高,并发症少,可作为治疗的首选方案。

  16. Pituitary Adenoma Segmentation

    CERN Document Server

    Egger, Jan; Kuhnt, Daniela; Freisleben, Bernd; Nimsky, Christopher

    2011-01-01

    Sellar tumors are approximately 10-15% among all intracranial neoplasms. The most common sellar lesion is the pituitary adenoma. Manual segmentation is a time-consuming process that can be shortened by using adequate algorithms. In this contribution, we present a segmentation method for pituitary adenoma. The method is based on an algorithm we developed recently in previous work where the novel segmentation scheme was successfully used for segmentation of glioblastoma multiforme and provided an average Dice Similarity Coefficient (DSC) of 77%. This scheme is used for automatic adenoma segmentation. In our experimental evaluation, neurosurgeons with strong experiences in the treatment of pituitary adenoma performed manual slice-by-slice segmentation of 10 magnetic resonance imaging (MRI) cases. Afterwards, the segmentations were compared with the segmentation results of the proposed method via the DSC. The average DSC for all data sets was 77.49% +/- 4.52%. Compared with a manual segmentation that took, on the...

  17. GENERALIZED DOUBLE PARETO SHRINKAGE.

    Science.gov (United States)

    Armagan, Artin; Dunson, David B; Lee, Jaeyong

    2013-01-01

    We propose a generalized double Pareto prior for Bayesian shrinkage estimation and inferences in linear models. The prior can be obtained via a scale mixture of Laplace or normal distributions, forming a bridge between the Laplace and Normal-Jeffreys' priors. While it has a spike at zero like the Laplace density, it also has a Student's t-like tail behavior. Bayesian computation is straightforward via a simple Gibbs sampling algorithm. We investigate the properties of the maximum a posteriori estimator, as sparse estimation plays an important role in many problems, reveal connections with some well-established regularization procedures, and show some asymptotic results. The performance of the prior is tested through simulations and an application.

  18. Pituitary infarction

    Science.gov (United States)

    ... during or right after childbirth, it is called Sheehan syndrome . This is a very rare condition. Risk factors ... commonly, pituitary dysfunction may appear more slowly. In Sheehan syndrome, for example, the first symptom may be a ...

  19. Predictive Value of Early Tumor Shrinkage and Density Reduction of Lung Metastases in Patients With Metastatic Colorectal Cancer Treated With Regorafenib.

    Science.gov (United States)

    Vanwynsberghe, Hannes; Verbeke, Xander; Coolen, Johan; Van Cutsem, Eric

    2017-03-29

    The benefit of regorafenib in colorectal cancer is not very pronounced. At present, there is lack of predictive biological or radiological markers. We studied if density reduction or small changes in size of lung metastases could be a predictive marker. We retrospectively measured density in size of lung metastases of all patients included in the CORRECT and CONSIGN trials at our center. Contrast-enhanced CT scan at baseline and at week 8 were compared. Data of progressive-free survival and overall survival were collected from the CORRECT and CONSIGN trials. A significant difference in progressive-free survival was seen in 3 groups: response or stable disease in size (5.36 vs. 3.96 months), response in density (6.03 vs. 2.72 months), and response in corrected density (6.14 vs. 3.08 months). No difference was seen for response in size versus stable disease or progressive disease in size. For overall survival, a difference was observed in the same 3 groups: response or stable disease in size (9.89 vs. 6.44 months), response in density (9.59 vs. 7.04 months), and response in corrected density (9.09 vs. 7.16 months). No difference was seen for response in size versus stable disease or progressive disease in size. Density reduction in lung metastases might be a good predictive parameter to predict outcome for regorafenib. Early tumor progression might be a negative predictive factor. If further validated, density reduction and early tumor progression might be useful to ameliorate the cost-benefit of regorafenib. Copyright © 2017 Elsevier Inc. All rights reserved.

  20. Cirurgia da hipófise por via trans-esfenoidal sob controle radiofluoroscópico e microdissecção novo tratamento da retinopatia diabética, tumores selares e neoplasias endocrinodependentes The surgery of the pituitary gland using a transphenoidal approach under radiofluoroscopic control and microdisection: a new treatment for diabetic retinopathy, pituitary tumors and endocrinodependent growths

    Directory of Open Access Journals (Sweden)

    Jules Hardy

    1968-03-01

    Full Text Available É apresentada nova técnica para a ablação total ou seletiva da hipófise utilizando via de acesso trans-esfenoidal, controle radiofluoroscópico e microdissecção, com traumatismo desprezível às estruturas circunvizinhas. Os autores comentam as aplicações do método à prática neurocirúrgica, relatando parte de uma série de mais 140 casos já operados. São discutidos os resultados obtidos no tratamento de 17 casos de retinopatia diabética, em 11 dos quais apenas o lobo anterior da hipófise foi removido, assim como aqueles obtidos na exérese de 20 casos de tumores selares. As indicações da hipofisectomia por via trans-esfenoidal no controle da sintomatologia das neoplasias endòcrinodependentes é estudada à luz dos resultados obtidos em 17 casos, sendo os resultados comparados com casos nos quais foi feita a implantação selar de ítrio90. As complicações operatorias em relação às três entidades nosológicas acima estudadas são também analisadas. Os autores salientam que a técnica descrita constitui, no presente estado das técnicas neurocirúrgicas utilizadas para a produção de uma insuficiência hipofisária duradoura, a intervenção de escolha.A new neurosurgical technique for the partial or total exéresis of the pituitary gland, using a transphenoidal approach under radiofluoroscopic control and microdisection is described. Part of a series of more than 140 cases operated upon by this method is reported. Results obtained in the treatment of diabetic retinopathy in 17 cases, 11 of which had only the pars anterior removed, are discussed. The applications of the transphenoidal route in 20 cases of pituitary fossa tumors are analysed. The indications of this type of operation in the management of endocrinodependent cancer is studied in 17 cases and compared with the results of 36 cases submitted to implant of Yttrium90 in the sella turcica. The operative complications following transphenoidal exéresis of the

  1. Pituitary apoplexy

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    Salam Ranabir

    2011-01-01

    Full Text Available Pituitary apoplexy is rare endocrine emergency which can occur due to infarction or haemorrhage of pituitary gland. This disorder most often involves a pituitary adenoma. Occasionally it may be the first manifestation of an underlying adenoma. There is conflicting data regarding which type of pituitary adenoma is prone for apoplexy. Some studies showed predominance of non-functional adenomas while some other studies showed a higher prevalence in functioning adenomas amongst which prolactinoma have the highest risk. Although pituitary apoplexy can occur without any precipitating factor in most cases, there are some well recognizable risk factors such as hypertension, medications, major surgeries, coagulopathies either primary or following medications or infection, head injury, radiation or dynamic testing of the pituitary. Patients usually present with headache, vomiting, altered sensorium, visual defect and/or endocrine dysfunction. Hemodynamic instability may be result from adrenocorticotrophic hormone deficiency. Imaging with either CT scan or MRI should be performed in suspected cases. Intravenous fluid and hydrocortisone should be administered after collection of sample for baseline hormonal evaluation. Earlier studies used to advocate urgent decompression of the lesion but more recent studies favor conservative approach for most cases with surgery reserved for those with deteriorating level of consciousness or increasing visual defect. The visual and endocrine outcomes are almost similar with either surgery or conservative management. Once the acute phase is over, patient should be re-evaluated for hormonal deficiencies.

  2. Inhibitory Effects of Anti-VEGF Antibody on the Growth and Angiogenesis of Estrogen-induced Pituitary Prolactinoma in Fischer 344 Rats: Animal Model of VEGF-targeted Therapy for Human Endocrine Tumors

    Science.gov (United States)

    Miyajima, Katsuhiro; Takekoshi, Susumu; Itoh, Johbu; Kakimoto, Kochi; Miyakoshi, Takashi; Osamura, Robert Yoshiyuki

    2010-01-01

    Estrogen-induced pituitary prolactin-producing tumors (PRLoma) in F344 rats express a high level of vascular endothelial growth factor (VEGF) associated with marked angiogenesis and angiectasis. To investigate whether tumor development in E2-induced PRLoma is inhibited by anti-VEGF monoclonal antibody (G6-31), we evaluated tumor growth and observed the vascular structures. With simultaneous treatment with G6-31 for the latter three weeks of the 13-week period of E2 stimulation (E2+G6-31 group), the following inhibitory effects on the PRLoma were observed in the E2+G6-31 group as compared with the E2-only group. In the E2+G6-31 group, a tendency to reduction in pituitary weight was observed and significant differences were observed as (1) reductions in the Ki-67-positive anterior cells, (2) increases in TUNEL-positive anterior cells, and (3) repair of the microvessel count by CD34-immunohistochemistry. The characteristic “blood lakes” in PRLomas were improved and replaced by repaired microvascular structures on 3D observation using confocal laser scanning microscope. These inhibitory effects due to anti-VEGF antibody might be related to the autocrine/paracrine action of VEGF on the tumor cells, because VEGF and its receptor are co-expressed on the tumor cells. Thus, our results demonstrate that anti-VEGF antibody exerted inhibitory effects on pituitary tumorigenesis in well-established E2 induced PRLomas. PMID:20514290

  3. Profiling of adrenocorticotropic hormone and arginine vasopressin in human pituitary gland and tumor thin tissue sections using droplet-based liquid-microjunction surface-sampling-HPLC-ESI-MS-MS.

    Science.gov (United States)

    Kertesz, Vilmos; Calligaris, David; Feldman, Daniel R; Changelian, Armen; Laws, Edward R; Santagata, Sandro; Agar, Nathalie Y R; Van Berkel, Gary J

    2015-08-01

    Described here are the results from the profiling of the proteins arginine vasopressin (AVP) and adrenocorticotropic hormone (ACTH) from normal human pituitary gland and pituitary adenoma tissue sections, using a fully automated droplet-based liquid-microjunction surface-sampling-HPLC-ESI-MS-MS system for spatially resolved sampling, HPLC separation, and mass spectrometric detection. Excellent correlation was found between the protein distribution data obtained with this method and data obtained with matrix-assisted laser desorption/ionization (MALDI) chemical imaging analyses of serial sections of the same tissue. The protein distributions correlated with the visible anatomic pattern of the pituitary gland. AVP was most abundant in the posterior pituitary gland region (neurohypophysis), and ATCH was dominant in the anterior pituitary gland region (adenohypophysis). The relative amounts of AVP and ACTH sampled from a series of ACTH-secreting and non-secreting pituitary adenomas correlated with histopathological evaluation. ACTH was readily detected at significantly higher levels in regions of ACTH-secreting adenomas and in normal anterior adenohypophysis compared with non-secreting adenoma and neurohypophysis. AVP was mostly detected in normal neurohypophysis, as expected. This work reveals that a fully automated droplet-based liquid-microjunction surface-sampling system coupled to HPLC-ESI-MS-MS can be readily used for spatially resolved sampling, separation, detection, and semi-quantitation of physiologically-relevant peptide and protein hormones, including AVP and ACTH, directly from human tissue. In addition, the relative simplicity, rapidity, and specificity of this method support the potential of this basic technology, with further advancement, for assisting surgical decision-making. Graphical Abstract Mass spectrometry based profiling of hormones in human pituitary gland and tumor thin tissue sections.

  4. Pituitary Apoplexy After Thyrotropin-releasing Hormone Stimulation Test in a Patient with Pituitary Macroadenoma

    Directory of Open Access Journals (Sweden)

    Huei-Fang Wang

    2007-09-01

    Full Text Available Pituitary apoplexy is a rare complication of pituitary tumors. We report a case of a 41-year-old female with acromegaly due to a pituitary macroadenoma, who developed pituitary apoplexy after a thyrotropin-releasing hormone (TRH 200 mg intravenous injection stimulation test. Neither emergency computed tomography (CT scans nor magnetic resonance imaging (MRI, performed 6 hours and 12 hours, respectively, after the active episode, disclosed the evidence of acute hemorrhage or infarction. Two days later, the pituitary mass, removed by transsphenoidal approach, showed ischemic necrosis and acute hemorrhage. The TRH test is generally safe for evaluating pituitary function, but pituitary apoplexy may occur after the procedure. CT and MRI may miss the diagnosis of pituitary apoplexy, especially if performed immediately after the acute episode.

  5. Preparation of High Shrinkage Polypropylene

    Institute of Scientific and Technical Information of China (English)

    吕文军; 王华平; 李建梅; 张玉梅

    2001-01-01

    The common PP chips have been used to prepare high shrinkage PP fibers with shrinkage in boiling water higher than 50%. Meanwhile, the process conditions on fiber structure and properties have been discussed in detail. With the increase of drawing temperature, the shrinkage in boiling water of the fiber increases at first,and then decreases in the temperature range from 70℃ to 100℃. The better drawing temperature is from 75℃ to 85℃ according to the melt index of the PP material. The shrinkage in boiling water of PP fiber increases with the increase of pump delivery. The orientation factor and crystallinity increase with the increase of drawing temperature. With an increase in drawing temperature,unit-cell numbers and monomer unit numbers in every crystal nucleus tend to increase, but unit volume crystal nucleus tend to reduce.

  6. Spontaneous shrinkage of vestibular schwannoma

    Directory of Open Access Journals (Sweden)

    Rossana Romani

    2016-01-01

    Conclusion: Early WWR management can be associated with spontaneous shrinkage of VS over time. Prospective clinical study of larger numbers of such cases using the UK VS database may help to identify predictive factors for the spontaneous regression of VS.

  7. The soil reference shrinkage curve

    CERN Document Server

    Chertkov, V Y

    2014-01-01

    A recently proposed model showed how a clay shrinkage curve is transformed to the soil shrinkage curve at the soil clay content higher than a critical one. The objective of the present work was to generalize this model to the soil clay content lower a critical one. I investigated (i) the reference shrinkage curve, that is, one without cracks; (ii) the superficial layer of aggregates, with changed pore structure compared with the intraaggregate matrix; and (iii) soils with sufficiently low clay content where there are large pores inside the intraaggregate clay (so-called lacunar pores). The methodology is based on detail accounting for different contributions to the soil volume and water content during shrinkage. The key point is the calculation of the lacunar pore volume variance at shrinkage. The reference shrinkage curve is determined by eight physical soil parameters: (1) oven-dried specific volume; (2) maximum swelling water content; (3) mean solid density; (4) soil clay content; (5) oven-dried structural...

  8. RNAi-mediated knockdown of pituitary tumor-transforming gene-1 (PTTG1) suppresses the proliferation and invasive potential of PC3 human prostate cancer cells

    Energy Technology Data Exchange (ETDEWEB)

    Huang, S.Q. [Department of Urology and Center of Nephrology, Xinqiao Hospital, Third Military Medical University, Chongqing (China); Institute of Urology, Peking University and Department of Urology, First Hospital, Peking University, Beijing (China); Liao, Q.J.; Wang, X.W. [Department of Urology and Center of Nephrology, Xinqiao Hospital, Third Military Medical University, Chongqing (China); Xin, D.Q. [Institute of Urology, Peking University and Department of Urology, First Hospital, Peking University, Beijing (China); Chen, S.X.; Wu, Q.J.; Ye, G. [Department of Urology and Center of Nephrology, Xinqiao Hospital, Third Military Medical University, Chongqing (China)

    2012-08-10

    Pituitary tumor-transforming gene-1 (PTTG1) is a proto-oncogene that promotes tumorigenesis and metastasis in numerous cell types and is overexpressed in a variety of human tumors. We have demonstrated that PTTG1 expression was up-regulated in both human prostate cancer specimens and prostate cancer cell lines. For a more direct assessment of the function of PTTG1 in prostate tumorigenesis, RNAi-mediated knockdown was used to selectively decrease PTTG1 expression in PC3 human prostate tumor cells. After three weeks of selection, colonies stably transfected with PTTG1-targeted RNAi (the knockdown PC3 cell line) or empty vector (the control PC3 cell line) were selected and expanded to investigate the role of PTTG1 expression in PC3 cell growth and invasion. Cell proliferation rate was significantly slower (28%) in the PTTG1 knockdown line after 6 days of growth as indicated by an MTT cell viability assay (P < 0.05). Similarly, a soft agar colony formation assay revealed significantly fewer (66.7%) PTTG1 knockdown PC3 cell colonies than control colonies after three weeks of growth. In addition, PTTG1 knockdown resulted in cell cycle arrest at G1 as indicated by fluorescence-activated cell sorting. The PTTG1 knockdown PC3 cell line also exhibited significantly reduced migration through Matrigel in a transwell assay of invasive potential, and down-regulation of PTTG1 could lead to increased sensitivity of these prostate cancer cells to a commonly used anticancer drug, taxol. Thus, PTTG1 expression is crucial for PC3 cell proliferation and invasion, and could be a promising new target for prostate cancer therapy.

  9. Characterization of pancreatic glucagon-producing tumors and pituitary gland tumors in transgenic mice overexpressing MYCN in hGFAP-positive cells

    NARCIS (Netherlands)

    Fielitz, K. (Kathrin); Althoff, K. (Kristina); De Preter, K. (Katleen); J. Nonnekens (Julie); Ohli, J. (Jasmin); Elges, S. (Sandra); Hartmann, W. (Wolfgang); G. Kloppel (Günter); Knösel, T. (Thomas); Schulte, M. (Marc); L. Klein-Hitpass (Ludger); Beisser, D. (Daniela); Reis, H. (Henning); Eyking, A. (Annette); Cario, E. (Elke); J.H. Schulte (Johannes); A. Schramm (Alexander); U. Schüller (Ulrich)

    2016-01-01

    textabstractAmplification or overexpression of MYCN is involved in development and maintenance of multiple malignancies. A subset of these tumors originates from neural precursors, including the most aggressive forms of the childhood tumors, neuroblastoma and medulloblastoma. In order to model the s

  10. IMAGING IN PITUITARY APOPLEXY

    Directory of Open Access Journals (Sweden)

    Madhukar

    2015-09-01

    Full Text Available Pituitary apoplexy is an acute clinical condition characterized by sudden onset of headache, vomiting, visual disturbance, ophthalmoplegia and altered sensorium occurring due to infarction or haemorrhage of pituitary gland and often involving the pituita ry adenoma. Predominantly seen in non - functional adenomas and in functioning adenomas with prolactinomas having the highest risk. Patients usually present with headache, vomiting, altered sensorium, visual defect and/or endocrine dysfunction. Hemodynamic i nstability may result from adrenocorticotrophic hormone deficiency. Imaging with either CT scan or MRI is performed in suspected cases. On CT, a recent hemorrhage appears as a single or multiple hyperdense lesions with no or little contrast enhancement. MR I is useful in estimating the onset of bleeding and to show the relationship between the tumor and the surrounding structures. CT or MR Angiography is done to rule out aneurysm. Treatment is conservative and surgery is reserved for those cases with deterio rating level of consciousness or increasing visual defect. Here we present a 47 year old male who presented with history of headache and visual disturbances for 6 weeks and was evaluated with radiograph, CT and MRI. A 47 year old male patient presented to the Neurosurgical Department of Vydehi Medical College and Research Centre with history of gradual blurring of vision in the left eye for 2 months. History of diabetes or hypertension was present. The man was hemodynamically stable. Radiograph of the skull showed widening of sella with erosion of the floor. He was advised CT. CT showed widening of sella and a pituitary lesion with fluid level. MRI was advocated for further evaluation. MRI axial and coronal showed sellar and suprasellar mass with figure of e ight appearance mass suggesting pituitary mass. Hyper intense fluid level was seen suggesting bleed within the mass. Contrast MRI showed peripheral enhancement. Diagnosis of

  11. A transseptal approach in transsphenoidal surgery for pituitary (hypophyseal) tumors; Dojscie przez przegrode nosowa w operacjach transsfenoidalnych guzow przysadki mozgowej

    Energy Technology Data Exchange (ETDEWEB)

    Gierek, T.; Galuszko-Ignasiak, B.; Krauze, J.; Rudnik, A. [Slaska Akademia Medyczna, Katowice (Poland)]|[Poradnia Otolaryngologiczna dla Dzieci, Zaklad Opieki Zdrowotnej, Swietochlowice (Poland)

    1994-12-31

    The authors described the direct transseptal approach in transsphenoidal surgery for hypophyseal tumors. This route gives a good insight into the area of the sella. The above mentioned method is also less destructive to nasal structures in the nasal cavity, because preserves the anterior nasal septum. It is uniformity of actually views of rhinological school. 20 patients were operated using this method and none of them noticed the changes of nasal airway and the sense of smell. (author)

  12. Characterization of a pituitary-tumor-derived cell line, TtT/GF, that expresses Hoechst efflux ABC transporter subfamily G2 and stem cell antigen 1.

    Science.gov (United States)

    Mitsuishi, Hideo; Kato, Takako; Chen, Mo; Cai, Li-Yi; Yako, Hideji; Higuchi, Masashi; Yoshida, Saishu; Kanno, Naoko; Ueharu, Hiroki; Kato, Yukio

    2013-11-01

    The anterior lobe of the pituitary gland is composed of five types of endocrine cells and of non-endocrine folliculo-stellate cells that produce various local signaling molecules. The TtT/GF cell line is derived from pituitary tumors, produces no hormones and has folliculo-stellate cell-like characteristics. The biological function of TtT/GF cells remains elusive but several properties have been postulated (support of endocrine cells, control of cell proliferation, scavenger function). Recently, we observed that TtT/GF cells have high resistance to the antibiotic G418 and low influx for Hoechst 33342, indicating the presence of ATP-binding cassette (ABC) transporters that efflux multiple drugs, i.e., a property similar to that of stem/progenitor cells. Therefore, we examine TtT/GF cells for the presence of ABC transporters, for the efflux ability of Hoechst 33342 and for those genes characteristic of TtT/GF cells. Real-time polymerase chain reaction (PCR) for ABC transporters demonstrated that Abcb1a, Abcb1b and Abcg2, regarded as stem cell markers, were characteristically expressed in TtT/GF cells but not in Tpit/F1 and LβT2 cells. Furthermore, the remarkable low-efflux ability of Hoechst 33342 from TtT/GF cells was confirmed by using inhibitors and contrasted with the abilities of Tpit/F1 and LβT2 cells. The high and specific expression of stem cell antigen 1 (Sca1) in TtT/GF cells was confirmed by real-time PCR. We also demonstrated those genes that are expressed abundantly and characteristically in TtT/GF, suggesting that TtT/GF cells have unique characteristics similar to those of stem/progenitor cells of endothelial or mesenchymal origin. Thus, the present study has revealed an intriguing property of TtT/GF cells, providing a new clue for an understanding of the function of this cell line.

  13. Pituitary prolactin adenoma with Toxoplasma gondii infection

    Institute of Scientific and Technical Information of China (English)

    张晓晖; 李青; 程虹; 阎庆国; 黄高昇

    2003-01-01

    Objective: To report two recent cases of pituitary adenoma associated with Toxoplasma gondii (T.Gondii) infection.Methods: Histological changes were observed in H & E and PAS staining sections microscopically.Immunohistochemistry was performed to classify the pituitary tumors and to confirm the diagnosis of T.gondii.Results: The cases were 43- and 19-year-old females, in which the latter one was a recurring case, and radiology examination showed that tumors existed in sellar region.Microscopically, the tumors consisted of small homogenous polygonal or round cells with abundant eosinophilic granular cytoplasm.Immunohistochemistry revealed they were prolactin-producing adenomas.Interestingly, we found toxoplasma infection in the tumor tissues, being confirmed by T.gondii sepicific antibody immunohistochemistry.Conclusion: The association of pituitary adenoma with toxoplasma raises the possibility that T.gondii may be involved in the development of certain cases of pituitary adenoma.

  14. Contemporary issues in the evaluation and management of pituitary adenomas.

    Science.gov (United States)

    Pekic, S; Stojanovic, M; Popovic, V

    2015-12-01

    Pituitary adenomas are common benign monoclonal neoplasms accounting for about 15% of intracranial neoplasms. Data from postmortem studies and imaging studies suggest that 1 of 5 individuals in the general population may have pituitary adenoma. Some pituitary adenomas (mainly microadenomas which have a diameter of less than 1 cm) are exceedingly common and are incidentally diagnosed on magnetic resonance imaging (MRI) performed for an unrelated reason (headache, vertigo, head trauma). Most microadenomas remain clinically occult and stable in size, without an increase in tumor cells and without local mass effects. However, some pituitary adenomas grow slowly, enlarge by expansion and become demarcated from normal pituitary (macroadenomas have a diameter greater than 1 cm). They may be clinically silent or secrete anterior pituitary hormones in excess such as prolactin, growth hormone (GH), or adrenocorticotropic hormone (ACTH) causing diseases like prolactinoma, acromegaly, Cushing's disease or rarely thyroid-stimulating hormone (TSH) or gonadotropins (LH, FSH). The incidence of the various subtypes of pituitary adenoma varies but the most common is prolactinoma. Clinically non-functioning pituitary adenomas (NFPAs), which do not secrete hormones often cause local mass symptoms and represent one-third of pituitary adenomas. Given the high prevalence of pituitary adenomas and their heterogeneity (different tumor subtypes), it is critical that clinicians have a thorough understanding of the potential abnormalities in pituitary function and prognostic factors for behavior of pituitary adenomas in order to timely implement specific treatment modalities. Regarding pathogenesis of these tumors genetics, epigenetics and signaling pathways are the focus of current research yet our understanding of pituitary tumorigenesis remains incomplete. Although several genes and signaling pathways have been identified as important factors in the development of pituitary tumors, current

  15. Pituitary magnetic resonance imaging in Cushing's disease.

    Science.gov (United States)

    Vitale, Giovanni; Tortora, Fabio; Baldelli, Roberto; Cocchiara, Francesco; Paragliola, Rosa Maria; Sbardella, Emilia; Simeoli, Chiara; Caranci, Ferdinando; Pivonello, Rosario; Colao, Annamaria

    2017-03-01

    Adrenocorticotropin-secreting pituitary tumor represents about 10 % of pituitary adenomas and at the time of diagnosis most of them are microadenomas. Transsphenoidal surgery is the first-line treatment of Cushing's disease and accurate localization of the tumor within the gland is essential for selectively removing the lesion and preserving normal pituitary function. Magnetic resonance imaging is the best imaging modality for the detection of pituitary tumors, but adrenocorticotropin-secreting pituitary microadenomas are not correctly identified in 30-50 % of cases, because of their size, location, and enhancing characteristics. Several recent studies were performed with the purpose of better localizing the adrenocorticotropin-secreting microadenomas through the use in magnetic resonance imaging of specific sequences, reduced contrast medium dose and high-field technology. Therefore, an improved imaging technique for pituitary disease is mandatory in the suspect of Cushing's disease. The aims of this paper are to present an overview of pituitary magnetic resonance imaging in the diagnosis of Cushing's disease and to provide a magnetic resonance imaging protocol to be followed in case of suspicion adrenocorticotropin-secreting pituitary adenoma.

  16. Expression of growth hormone (GH)-releasing factor gene in GH-producing pituitary adenoma.

    Science.gov (United States)

    Wakabayashi, I; Inokuchi, K; Hasegawa, O; Sugihara, H; Minami, S

    1992-02-01

    Pituitary cells synthesize various neuropeptides that influence pituitary hormone secretion. GH-releasing factor (GRF) may also be produced by normal or pituitary tumor cells. We examined GRF gene expression in pituitary tumors. Standard techniques for the analysis of GRF gene expression did not appear to be suitable. Highly sensitive reverse transcription coupled to polymerase chain reaction was used. Specimens of pituitary adenoma were obtained by transsphenoidal adenomectomy from six patients with acromegaly and three patients with no clinical evidence of pituitary hormone overproduction; non-functioning adenoma. Pituitary glands were collected at autopsy from three patients who died from nonendocrine disorders. A specific GRF gene transcript was detected in five out of six GH-producing pituitary adenomas, whereas this was not found in three separate specimens of nonfunctioning pituitary adenoma or anterior and posterior pituitary tissue. The data suggest that GRF is synthesized as an intrinsic product in human GH-producing pituitary adenoma.

  17. Mitigation strategies for autogenous shrinkage cracking

    DEFF Research Database (Denmark)

    Bentz, Dale P.; Jensen, Ole Mejlhede

    2004-01-01

    , the fundamental parameters contributing to the autogenous shrinkage and resultant early-age cracking of concrete are presented. Basic characteristics of the cement paste that contribute to or control the autogenous shrinkage response include the surface tension of the pore solution, the geometry of the pore...... of early-age cracking due to autogenous shrinkage. Mitigation strategies discussed in this paper include: the addition of shrinkage-reducing admixtures more commonly used to control drying shrinkage, control of the cement particle size distribution, modification of the mineralogical composition......, it should be possible to minimize cracking due to autogenous shrinkage via some combination of the presented approaches....

  18. Transcranial surgery for pituitary adenomas.

    Science.gov (United States)

    Youssef, A Samy; Agazzi, Siviero; van Loveren, Harry R

    2005-07-01

    Although the transsphenoidal approach is the preferred approach to the vast majority of pituitary tumors with or without suprasellar extension, the transcranial approach remains a vital part of the neurosurgical armamentarium for 1 to 4% of these tumors. The transcranial approach is effective when resection becomes necessary for a portion of a pituitary macroadenoma that is judged to be inaccessible from the transsphenoidal route because of isolation by a narrow waist at the diaphragma sellae, containment within the cavernous sinus lateral to the carotid artery, projection anteriorly onto the planum sphenoidale, or projection laterally into the middle fossa. The application of a transcranial approach in these circumstances may still be mitigated by response to prolactin inhibition of prolactinomas, the frequent lack of necessity to remove asymptomatic nonsecretory adenomas from the cavernous sinus, and the lack of evidence that sustained chemical cures can be reliably achieved by removal of secretory adenomas (adrenocorticotropic hormone, growth hormone) from the cavernous sinus. Cranial base surgical techniques have refined the surgical approach to pituitary adenomas but have had less effect on actual surgical indications than anticipated. Because application of the transcranial approach to pituitary adenomas is and should be rare in clinical practice, it is useful to standardize the technique to a default mode with which the surgical team is most experienced and, therefore, most comfortable. Our default mode for transcranial pituitary surgery is the frontotemporal-orbitozygomatic approach.

  19. Diagnostic criteria in invasive pituitary adenomas

    Directory of Open Access Journals (Sweden)

    Moldovan Ioana-Maria

    2016-09-01

    Full Text Available Pituitary adenomas are benign pituitary primary tumors, the most frequent type of tumor in the pituitary fossa. An important part, around 1/3 of the pituitary adenomas manifests an aggressive behavior, growing faster and invading into parasellar areas (cavernous sinus, neural tissues and bones. Objectives: the first aim of this paper is to review the last findings about invasiveness diagnostic criteria, imagistic and biomarkers, which can be used in the classification of pituitary tumors and also to predict the probability of invasiveness, tumor recurrence and suspicion of malignancy. The second aim is to highlight the morphological and clinic types of invasive pituitary adenomas. Materials and methods: we performed a systematic review and analysis of the published articles, searching PubMed between January 1985 and December 2015. There were selected articles published in English, reviews and abstracts. During the advanced search type in PubMed, combinations of the following keywords were used: “pituitary adenoma”, “invasive”, “aggressive”, “biomarkers”, “classification”, “histological subtypes”, ‘”immunohistochemical markers”. Results: 215 articles were selected, regarding diagnostic, prognostic and therapeutic aspects. There were some histological subtypes of pituitary adenomas known as having an aggressive clinical behavior. Several biomarkers were identified as being associated with the invasive feature: proliferation markers (Ki-67 index, number of mitoses, p53 & p27 expression, microvascularization density, telomerase, topoisomerase 2 Alpha, matrix metalloproteinases, protein kinase C, cyclooxygenase-2, E-cadherin, transcription Factors, genetic alterations (PTTG gene, Galectin-3 protein/ LGALS3 gene, apoptosis markers. Based on their invasion and proliferation characteristics, pituitary tumors are proposed to be classified into five grades (1a, 1b, 2a, 2b, 3, the grade 2b tumor with high risk of recurrence

  20. Xenoestrogens at picomolar to nanomolar concentrations trigger membrane estrogen receptor-alpha-mediated Ca2+ fluxes and prolactin release in GH3/B6 pituitary tumor cells.

    Science.gov (United States)

    Wozniak, Ann L; Bulayeva, Nataliya N; Watson, Cheryl S

    2005-04-01

    Xenoestrogens (XEs) are widespread in our environment and are known to have deleterious effects in animal (and perhaps human) populations. Acting as inappropriate estrogens, XEs are thought to interfere with endogenous estrogens such as estradiol (E2) to disrupt normal estrogenic signaling. We investigated the effects of E2 versus several XEs representing organochlorine pesticides (dieldrin, endosulfan, o',p'-dichlorodiphenylethylene), plastics manufacturing by-products/detergents (nonylphenol, bisphenol A), a phytoestrogen (coumestrol), and a synthetic estrogen (diethylstilbestrol) on the pituitary tumor cell subline GH3/B6/F10, previously selected for expression of high levels of membrane estrogen receptor-alpha. Picomolar to nanomolar concentrations of both E2 and XEs caused intracellular Ca2+ changes within 30 sec of administration. Each XE produced a unique temporal pattern of Ca2+ elevation. Removing Ca2+ from the extracellular solution abolished both spontaneous and XE-induced intracellular Ca2+ changes, as did 10 microM nifedipine. This suggests that XEs mediate their actions via voltage-dependent L-type Ca2+ channels in the plasma membrane. None of the Ca2+ fluxes came from intracellular Ca2+ stores. E2 and each XE also caused unique time- and concentration-dependent patterns of prolactin (PRL) secretion that were largely complete within 3 min of administration. PRL secretion was also blocked by nifedipine, demonstrating a correlation between Ca2+ influx and PRL secretion. These data indicate that at very low concentrations, XEs mediate membrane-initiated intracellular CCa2+ increases resulting in PRL secretion via a mechanism similar to that for E2, but with distinct patterns and potencies that could explain their abilities to disrupt endocrine functions.

  1. Long-Term Outcome and MGMT as a Predictive Marker in 24 Patients With Atypical Pituitary Adenomas and Pituitary Carcinomas Given Treatment With Temozolomide

    DEFF Research Database (Denmark)

    Bengtsson, Daniel; Schrøder, Henrik Daa; Andersen, Marianne

    2015-01-01

    CONTEXT/OBJECTIVE: Locally aggressive pituitary tumors (LAPT) and pituitary carcinomas respond poorly to conventional therapy and cytotoxic drugs. Temozolomide (TMZ) is an oral alkylating drug with good tolerability, approved for treatment of malignant gliomas. The experience of its use...

  2. Acute pituitary apoplexy complicating a pituitary macroadenoma

    Directory of Open Access Journals (Sweden)

    Febin Joseph

    2010-12-01

    Full Text Available Pituitary apoplexy is a rare but potentially life-threatening condition caused by either haemorrhage or infarction of the pituitary gland. In most cases, a pre-existing pituitary macroadenoma is present. Patients present with the clinical syndrome of headache, visual defects or ophthalmoplegia, altered state of consciousness and variable endocrine deficits.

  3. The shrinkage in lime mortars

    Directory of Open Access Journals (Sweden)

    Sánchez, J. A.

    1997-03-01

    Full Text Available Nowadays, the methodology existing to measure the shrinkage in air, developed for paste and cement mortars, has serious problems to be applied to lime mortars, due to its different mechanism of hardening several modifications in Norms UNE 80-113-86 y 80-112-89 make possible the determination of the shrinkage in these traditional mortars.

    La metodología existente en la actualidad para la medida de la retracción de secado, desarrollada para las pastas y los morteros de cemento, presenta serios problemas a la hora de su aplicación a los morteros de cal debido a su distinto mecanismo de endurecimiento. Algunas modificaciones de las normas UNE 80-113-86 y 80-112-89 hacen posible la determinación de la retracción en estos morteros tradicionales.

  4. The role of calcium-sensing receptor and signalling pathways in the pathophysiology in two in vitro models of malignant hypercalcemia: the rat rice H-500 Leydig testis cancer and prostate cancer (PC-3) cells. Expression and regulation of pituitary tumor transforming gene in Leydig testis cancer and astrocyte and astrocytoma cells

    DEFF Research Database (Denmark)

    Tfelt-Hansen, J.

    2008-01-01

    studies. The CaR upregulated the release of parathyroid hormone-related peptide (PTHrP), the main mediator of hypercalcemia in HHM. The growth rate of the tumor was also increased by stimulation of the CaR, as DNA synthesis and protection against apoptosis were enhanced. The oncogene, pituitary tumor...

  5. Magnetic resonance imaging of pituitary adenomas

    Energy Technology Data Exchange (ETDEWEB)

    Bonneville, Jean-Francois; Bonneville, Fabrice; Cattin, Francoise [University Hospital, Department of Neuroradiology, Besancon (France)

    2005-03-01

    Today, MR is the only method needed for the morphological investigation of endocrine-active pituitary adenomas. In acromegaly and Cushing's syndrome, the therapeutic attitude is directly dictated by MR data. We present the MR aspect of pituitary adenomas according to size, sex, age, endocrine activity and a few particular conditions such as hemorrhagic pituitary adenomas, pituitary adenomas during pregnancy, cavernous sinus invasion and postsurgical changes. When an intrasellar mass extending out of the sella turcica is detected, the goal of the MR examination is to indicate precisely the origin of the tumor, its extension in relation to the various surrounding structures, its structure and its enhancement in order to help in the differential diagnosis. Demonstration of very small pituitary adenomas remains a challenge. When SE T1- and Turbo SE T2-weighted sequences are non-diagnostic, enhanced imaging becomes mandatory; half-dose gadolinium injection, delayed sequence, dynamic imaging can be of some help. (orig.)

  6. A 23-Year-Old Female with a Mixed Germ Cell Tumor of the Pituitary Infundibulum: The Challenge of Differentiating Neoplasm from Lymphocytic Infundibuloneurohypophysitis—A Case Report and Literature Review

    Directory of Open Access Journals (Sweden)

    Sann Yu Mon

    2014-01-01

    Full Text Available The pathologic spectrum of diseases that infiltrate the pituitary infundibulum includes a broad variety of clinical entities. There are significant differences in the prevalence of these etiologies depending on the age of presentation. Lymphocytic infundibuloneurohypophysitis (LINH predominates over other causes of infundibular disease in adults over age 21. Differentiating LINH from other causes of infundibular disease can be difficult because the various etiologies often have similar clinical presentations and radiologic imaging characteristics. We report the first case in an adult of a mixed germ cell tumor comprised of germinoma and embryonal cell carcinoma infiltrating the pituitary infundibulum. In our case, a 23-year-old female was initially misdiagnosed as having LINH. She presented with panhypopituitarism and diabetes insipidus, which is the most common initial presentation in both entities. The two diagnoses are difficult to distinguish based on MRI imaging, CSF findings, and histopathological examination. Our case demonstrates the need for close follow-up of patients with isolated lesions of the pituitary infundibulum and reinforces the need for biopsy of an infundibular lesion when progression of disease is demonstrated. In our case, biopsy with comprehensive immunohistochemical staining was the sole means of making a definitive diagnosis.

  7. The influence of shrinkage reducing admixtures on plastic shrinkage

    Directory of Open Access Journals (Sweden)

    Mora, J.

    2003-12-01

    Full Text Available Shrinkage reducing admixtures (SRAs are viable alternatives for reducing plastic shrinkage cracking in concrete. The objective of the present paper is to study early age plastic shrinkage in restrained concrete elements, where three different SRAs have been used. The influence of the admixture is analyzed through the following measurements: capillary pressure, evaporation, temperature evolution, crack evolution and settlement. The tests for studying the cracking and deformation were made on two different configurations (i.e., restrained prisms with reduced cross-section and restrained panel, in a wind tunnel, with controlled wind temperature and velocity. The conclusions obtained indicate the viability of the use of this type of admixture and the usefulness of the test methods.

    Los aditivos reductores de retracción (SRAs se plantean, hoy en día, como una alternativa viable para reducir la fisuración por retracción plástica. El objetivo del presente artículo es conocer mejor y predecir el comportamiento a primeras edades de la retracción plástica en elementos estructurales coaccionados, a los que se les ha añadido diversos aditivos reductores de retracción (tres tipos diferentes. Esta influencia se analiza a través de las siguientes propiedades: presión capilar, evaporación, evolución de temperaturas, evolución de fisuración, y deformaciones verticales de asentamiento. Los ensayos para estudiar la fisuración y las deformaciones se han realizado sobre diferentes configuraciones (prisma restringido con estrangulamiento y panel restringido, en un túnel de viento, con temperaturas y velocidades de viento controladas. Las conclusiones obtenidas señalan la viabilidad del empleo de este tipo de aditivos y la bondad de los métodos experimentales utilizados.

  8. Prevalence of hypopituitarism after intracranial operations not directly associated with the pituitary gland

    National Research Council Canada - National Science Library

    Fleck, Steffen Kristian; Wallaschofski, Henri; Rosenstengel, Christian; Matthes, Marc; Kohlmann, Thomas; Nauck, Matthias; Schroeder, Henry Werner Siegfried; Spielhagen, Christin

    2013-01-01

    ...) and subarachnoid hemorrhage (SAH) has steadily increased. Moreover, recent studies have found that a clinically relevant number of patients develop pituitary insufficiency after intracranial operations and radiation treatment for non-pituitary tumors...

  9. Treatment Option Overview (Pituitary Tumors)

    Science.gov (United States)

    ... reflexes work. This may also be called a neuro exam or a neurologic exam. MRI (magnetic resonance ... Websites POLICIES Accessibility Comment Policy Disclaimer FOIA Privacy & Security Reuse & Copyright Syndication Services Website Linking U.S. Department ...

  10. Treatment Options for Pituitary Tumors

    Science.gov (United States)

    ... reflexes work. This may also be called a neuro exam or a neurologic exam. MRI (magnetic resonance ... Websites POLICIES Accessibility Comment Policy Disclaimer FOIA Privacy & Security Reuse & Copyright Syndication Services Website Linking U.S. Department ...

  11. Temozolomide in aggressive pituitary adenomas and carcinomas

    OpenAIRE

    Leon D. Ortiz; Luis V. Syro; Scheithauer, Bernd W.; Fabio Rotondo; Humberto Uribe; Camilo E Fadul; Eva Horvath; Kalman Kovacs

    2012-01-01

    Temozolomide is an alkylating agent used in the treatment of gliomas and, more recently, aggressive pituitary adenomas and carcinomas. Temozolomide methylates DNA and, thereby, has antitumor effects. O 6-methylguanine-DNA methyltransferase, a DNA repair enzyme, removes the alkylating adducts that are induced by temozolomide, thereby counteracting its effects. A Medline search for all of the available publications regarding the use of temozolomide for the treatment of pituitary tumors was perf...

  12. Study on the clinical relativity of glial cell growth factor and prolactin pituitary tumor%胶质细胞生长因子与泌乳素垂体瘤的临床相关性研究

    Institute of Scientific and Technical Information of China (English)

    刘永军; 高翔; 刘吉祥; 李建华

    2014-01-01

    目的:探讨胶质细胞生长因子(GGF)与泌乳素垂体瘤临床的相关性,并分析其预测临床复发的价值。方法研究对象为本院收治的71例泌乳素垂体瘤(PRL )患者,采用免疫组织化学检测GGF在肿瘤组织中的表达情况,分析GGF表达水平与PRL水平、肿瘤大小、微血管密度(MVD)及肿瘤侵袭性的关系,并进一步分析GGF表达水平与泌乳素垂体腺瘤复发的临床联系,最后采用多因素Cox生存风险模型寻求可能的预后影响因素。结果不同PRL水平、肿瘤大小、M VD及肿瘤侵袭性的患者其GGF表达水平也具有明显差异,且差异有统计学意义(P<0.05);3年无复发生存分析显示,GGF高表达组患者的3年无复发生存率(71.4%)和生存期(28.0±2.2)个月均明显低于低表达GGF组88.9%和(32.8±1.5)个月,但差异无统计学意义(P>0.05);多因素Cox生存风险模型分析提示GGF可能是预测泌乳素垂体瘤患者复发预后的独立生物学指标( P<0.05)。结论 GGF与泌乳素垂体瘤患者临床基线资料密切相关,且可能成为预测患者复发预后的重要生物学指标。%Objective To explore clinical relevance of the glial cell growth factor (GGF) and pro‐lactin pituitary tumor ,and to analyze clinical value of its predicting recurrence .Methods Research ob‐ject for the records of 71 cases in our hospital ,prolactin (PRL ) of pituitary adenoma patients using immunohistochemical detection GGF expression in tumor tissue ,analysis GGF expression level and the level of PRL ,tumor size ,microvascular density (MVD) and the relationship between tumor invasive , and further analysis GGF expression level and prolactin pituitary adenoma recurrence of clinical rela‐tion ,finally using multiariable Cox survival risk model for possible prognostic factors .Results The dif‐ferent levels of PRL ,tumor size ,tumor MVD and expression level

  13. Spontaneous remission of pituitary macroadenomas in women:report of two cases

    Institute of Scientific and Technical Information of China (English)

    WU Zhe-bao; SU Zhi-peng; WU Jin-sen

    2007-01-01

    @@ Spontaneous regression of pituitary macroadenomas is rare. It is generally thought that absorption of the necrotic tissue after pituitary apoplexy may cause the spontaneous healing of the tumor. However, such cases are often accompanied by hypopituitarism, which sould be treated with hormone replacement therapy. Here we report two cases of spontaneous remission of pituitary macroadenomas in women, who had complete tumor disappearance with preserved pituitary function.

  14. Nursing on continued lumbar cistern drainage after pituitary tumor surgery%经蝶垂体瘤术后脑脊液鼻漏行腰大池持续引流的护理

    Institute of Scientific and Technical Information of China (English)

    宋萍; 王鹿婷; 蔡春妮; 吴秋兰

    2012-01-01

    OBJECTIVE To study the nursing about continued lumbar cistern drainage after pituitary tumor surgery. METHODS SS cases of pituitary adenoma postoperative cerebrospinai fluid runny nose line with continued lumbar cistern drainage were analyzed. RESULTS Specific nursing was performed for pituitary tumor postoperative cerebrospinai fluid runny nose line with continued lumbar cistern drainage, we should pay closely observation on the condition and maintain effective airtight drainage, strengthen the basic nursing, psychological care and diet nursing to prevent complications. 5 cases with postoperative cerebrospinai fluid runny nose were performed with pool buy continued lumbar cistern drainage, and its effect is satisfied. One case showed intracranial infection, but finally cured. CONCLUSION The waist big pool drainage intracranial infection was not allowed to ignore, which should be given on effective nursing measures to prevent.%目的 探讨垂体瘤术后行腰大池外持续引流的护理.方法 对55例垂体瘤术后脑脊液鼻漏行腰大池持续引流的护理进行总结分析.结果 积极配合垂体瘤术后脑脊液鼻漏行腰大池持续引流术进行针对性护理,通过严密观察病情,维特有效的密闭引流,加强基础护理、心理护理、饮食护理及预防并发症.术后5例出现脑脊液鼻漏均行腰大池置管引流,其效果满意,有1例发生颅内感染,最终治愈.结论 腰大池引流术后颅内感染发生不容忽视,应给于有效的护理措施进行预防.

  15. Addison's Disease and Pituitary Enlargement.

    Science.gov (United States)

    Winters, Stephen J; Vitaz, Todd; Nowacki, Michael R; Craddock, Durrett C; Silverman, Craig

    2015-06-01

    A 60-year-old man with Addison's disease, primary hypothyroidism and type 2 diabetes mellitus who was treated with stable doses of hydrocortisone and fludrocortisone developed increasing skin pigmentation and a bitemporal hemianopia. The plasma ACTH level was 14,464 pg/mL, and an invasive pituitary macroadenoma with suprasellar extension was found on magnetic resonance imaging leading to transnasal-transsphenoidal adenomectomy. The tumor demonstrated features of an eosinophilic adenoma and stained uniformly for ACTH. Residual tumor was treated with stereotactic radiotherapy. This case and the 13 cases published previously indicate that primary adrenal failure may predispose to corticotroph hyperplasia, and in some patients to the development of an invasive corticotroph adenoma. The ACTH level should be measured, and a pituitary magnetic resonance imaging is indicated when skin pigmentation increases in a patient with primary adrenal failure who is receiving customary treatment with glucocorticoids and mineralocorticoids.

  16. Malignant tumors of the nasal cavity and paranasal sinuses: long-term outcome and morbidity with emphasis on hypothalamic-pituitary deficiency.

    NARCIS (Netherlands)

    Snyers, A.; Janssens, G.O.; Twickler, T.B.; Hermus, A.R.M.M.; Takes, R.P.; Kappelle, A.C.; Merkx, M.A.W.; Dirix, P.; Kaanders, J.H.A.M.

    2009-01-01

    PURPOSE: To evaluate the long-term outcome after surgery and radiotherapy for patients with sinonasal cancer and assess late toxicity, with special emphasis on hypothalamic-pituitary dysfunction. METHODS AND MATERIALS: A retrospective analysis of 168 patients treated for sinonasal cancer in a single

  17. Long-Term Natural Course of Pituitary Tumors in Patients With MEN1: Results From the DutchMEN1 Study Group (DMSG)

    NARCIS (Netherlands)

    Laat, J.M. de; Dekkers, O.M.; Pieterman, C.R.; Kluijfhout, W.P.; Hermus, A.R.M.M.; Pereira, A.M.; Horst-Schrivers, A.N. van der; Drent, M.L.; Bisschop, P.H.; Havekes, B.; Herder, W.W. de; Valk, G.D.

    2015-01-01

    CONTEXT: Guidelines advise lifelong radiological followup for asymptomatic pituitary adenomas (PITs) because of the risk for growth and subsequent visual field defects. In the context of multiple endocrine neoplasia type 1 (MEN1) an even more comprehensive screening is advised because PITs are presu

  18. Long-Term Natural Course of Pituitary Tumors in Patients With MEN1 : Results From the DutchMEN1 Study Group (DMSG)

    NARCIS (Netherlands)

    de Laat, Joanne M; Dekkers, Olaf M; Pieterman, Carolina R C; Kluijfhout, Wouter P; Hermus, Ad R; Pereira, Alberto M; van der Horst-Schrivers, Anouk N; Drent, Madeleine L; Bisschop, Peter H; Havekes, Bas; de Herder, Wouter W; Valk, Gerlof D.

    2015-01-01

    CONTEXT: Guidelines advise lifelong radiological followup for asymptomatic pituitary adenomas (PITs) because of the risk for growth and subsequent visual field defects. In the context of multiple endocrine neoplasia type 1 (MEN1) an even more comprehensive screening is advised because PITs are presu

  19. Long-Term Natural Course of Pituitary Tumors in Patients With MEN1 : Results From the DutchMEN1 Study Group (DMSG)

    NARCIS (Netherlands)

    de Laat, Joanne M.; Dekkers, Olaf M.; Pieterman, Carolina R. C.; Kluijfhout, Wouter P.; Hermus, Ad R.; Pereira, Alberto M.; van der Horst-Schrivers, Anouk N.; Drent, Madeleine L.; Bisschop, Peter H.; Havekes, Bas; de Herder, Wouter W.; Valk, Gerlof D.

    2015-01-01

    Context: Guidelines advise lifelong radiological followup for asymptomatic pituitary adenomas (PITs) because of the risk for growth and subsequent visual field defects. In the context of multiple endocrine neoplasia type 1 (MEN 1) an even more comprehensive screening is advised because PITs are pres

  20. Dissociation between the effects of somatostatin (SS) and octapeptide SS-analogs on hormone release in a small subgroup of pituitary- and islet cell tumors

    NARCIS (Netherlands)

    L.J. Hofland (Leo); W.W. de Herder (Wouter); H.A. Visser-Wisselaar (Heleen); C. van Uffelen; M. Waaijers (Marlijn); J. Zuyderwijk; P. Uitterlinden (Piet); P.M. van Koetsveld (Peter); S.W.J. Lamberts (Steven); J.M. Kros (Johan)

    1997-01-01

    textabstractThe effects of somatostatin (SS-14 and/or SS-28) and of the three octapeptide SS-analogs that are available for clinical use (octreotide, BIM-23014 and RC-160) on hormone release by primary cultures of 15 clinically nonfunctioning pituitary adenomas (NFA), 7

  1. Pituitary abscess: a case report and review of the literature

    Directory of Open Access Journals (Sweden)

    Apostolos K A Karagiannis

    2016-06-01

    Full Text Available Pituitary abscess is a rare life-threating entity that is usually misdiagnosed as a pituitary tumor with a definite diagnosis only made postoperatively. Over the last several decades, advances in healthcare have led to a significant decrease in morbidity and mortality due to pituitary abscess. We report a case of a 34-year-old woman who was admitted to our department for investigation of a pituitary mass and with symptoms of pituitary dysfunction, headaches and impaired vision. During her admission, she developed meningitis-like symptoms and was treated with antibiotics. She eventually underwent transsphenoidal surgery for excision of the pituitary mass. A significant amount of pus was evident intraoperatively; however, no pathogen was isolated. Six months later, the patient was well and had full recovery of the anterior pituitary function. Her menses returned, and she was only on treatment with desmopressin for diabetes insipidus that developed postoperatively.

  2. 经单侧鼻孔蝶窦入路显微切除垂体瘤38例分析%The Unilateral Nostril Transsphenoidal Microsurgery Excision of Pituitary Tumors in 38 Cases

    Institute of Scientific and Technical Information of China (English)

    马涛; 孙政; 王家文; 王磊

    2013-01-01

      目的:分析经单侧鼻孔蝶窦入路显微切除垂体瘤的临床治疗效果。方法:选取2007-2010年毫州市人民医院神经外科收治的垂体瘤患者38例,经单侧鼻孔蝶窦入路显微切除垂体瘤手术治疗,治疗后观察切除结果和临场症状改善情况,并发症发生率和住院时间。结果:38例患者手术治疗顺利,全切除31例,次全切6例,部分切除1例;患者术后临床症状均获得不同程度改善;治疗术后发生暂时性尿崩症5例,出现一过性脑脊液鼻漏2例,出现垂体功能低下1例,经治疗后明显好转。术后住院时间小于7 d 34例,只有4例住院超过7 d,10 d内也均康复出院。结论:经侧单侧鼻孔蝶窦入路显微切除垂体瘤具有微创、治愈率高、住院时间短、准确性高及并发症少,是垂体瘤手术治疗的首选。%Objective:To analyze the clinical effect of unilateral nostril transsphenoidal microsurgery resection for pituitary tumors.Methods:From 2007 to 2010 the People’s Hospital of Bozhou Neurosurgery treated 38 patients with pituitary tumors by unilateral nostril transsphenoidal microsurgery resection of pituitary tumors through the line of treatment,the treatment results were observed after resection and spot improvement of symptoms incidence of complications and hospitalization time. Results:38 patients surgery went well,subtotal resection in 31 cases,subtotal resection in 6 cases,partial resection of one case;Patients with varying degrees of clinical symptoms were improved;Treatment of postoperative transient diabetes insipidus occurred in 5 patients,cerebrospinal fluid rhinorrhea appeared to have 2 cases,1 case of hypopituitarism after treatment significantly improved.Less than seven days after hospital discharge in 34 cases,only four cases hospitalized for more than 7 days,10 were also discharged within.Conclusion:The side of unilateral nostril transsphenoidal pituitary tumor resection

  3. Accounting for PDMS shrinkage when replicating structures

    DEFF Research Database (Denmark)

    Madsen, Morten Hannibal; Feidenhans'l, Nikolaj Agentoft; Hansen, Poul-Erik

    2014-01-01

    are seldom applied to counteract the shrinkage of PDMS. Also, to perform metrological measurements using replica techniques one has to take the shrinkage into account. Thus we report a study of the shrinkage of PDMS with several different mixing ratios and curing temperatures. The shrinkage factor, with its...... associated uncertainty, for PDMS in the range 40 to 120 °C is provided. By applying this correction factor, it is possible to replicate structures with a standard uncertainty of less than 0.2% in lateral dimensions using typical curing temperatures and PDMS mixing ratios in the range 1:6 to 1:20 (agent:base)....

  4. Shrinkage behavior of self-compacting concrete

    Institute of Scientific and Technical Information of China (English)

    Farhad ASLANI; Shami NEJADI

    2012-01-01

    In the structures where long-term behavior should be monitored and controlled,creep and shrinkage effects have to be included precisely in the analysis and design procedures.Shrinkage varies with the constituent and mixture proportions,and depends on the curing conditions and the work environment as well.Self-compacting concrete (SCC) contains combinations of various components,such as aggregate,cement,superplasticizer,water-reducing agent and other ingredients which affect the properties of the SCC including shrinkage.Hence,the realistic prediction shrinkage strains of SCC are an important requirement of the design process for this type of concrete structures.This study reviews the accuracy of the conventional concrete (CC) shrinkage prediction models proposed by the international codes of practice,including CEB-FIP (1990),ACI 209R (1997),Eurocode 2 (2001),JSCE (2002),AASHTO (2004; 2007) and AS 3600 (2009).Also,SCC shrinkage prediction models proposed by Poppe and De Schutter (2005),Larson (2007),Cordoba (2007) and Khayat and Long (2010) are reviewed.Further,a new shrinkage prediction model based on the comprehensive analysis on both of the available models,i.e.,the CC and the SCC is proposed.The predicted shrinkage strains are compared with the actual measured shrinkage strains in 165 mixtures of SCC and 21 mixtures of CC.

  5. Tumorer

    DEFF Research Database (Denmark)

    Prause, J.U.; Heegaard, S.

    2005-01-01

    oftalmologi, øjenlågstumorer, conjunctivale tumorer, malignt melanom, retinoblastom, orbitale tumorer......oftalmologi, øjenlågstumorer, conjunctivale tumorer, malignt melanom, retinoblastom, orbitale tumorer...

  6. [Preservation of the pituitary stalk and the gland in transsphenoidal microsurgery for pituitary adenomas].

    Science.gov (United States)

    Li, Haoyu; Yuan, Xianrui; Liao, Yiwei; Xie, Yuanyang; Zhang, Chi; Li, Juan; Su, Jun; Wang, Xiangyu; Chen, Xiaoyu; Liu, Qing

    2014-02-01

    To improve the surgical outcome of pituitary adenomas by identifying and preserving the pituitary stalk and the gland during surgery. From October 2010 to September 2012, the author from the Department of Neurosurgery of Xiangya Hospital, Central South University operated on 51 patients with pituitary adenoma. During the operations, we carefully identified the normal adenohypophysis, pituitary stalk, neurohypophysis and the abnormal tissues either by direct observation or by medical images, aiming to excise the tumor thoroughly, protect the pituitary function and reduce the postoperative complications. Totally 37 patients (72.5%, 37/51) had total resection of the tumor, 12 (23.5%, 12/51) had subtotal tumor resection and the other 2 had major removal. The gland and the pituitary stalk were well identified and reserved. Detection of hormone content proved that the operation had little effect on the free triiodothyronine (FT3) and adrenocorticotropic hormone (ACTH), while for free tetraiodothyronine (FT4) and thyroid stimulating hormone (TSH) and postoperative followup significant alleviation was found. There was no significant fluctuation for the testosterone in the men preoperatively and postoperatively (all the above results were obtained without hormone replacement therapy). The main postoperative complications were as follows: temporary diabetes insipidus in 5 patients (9.8%, 5/51); electrolyte disorder (the appearance of hyponatremia) in 17 (33.3%, 17/51); and cerebrospinal fluid rhinorrhea and postoperative intracranial infection in 1 (2%, 1/51). No one died during the perioperation period. Microscopic transsphenoidal surgery is effective for pituitary adenomas including tumors violating the cavernous sinus. Accurate identification of the pituitary stalk, the gland and the abnormal tissue during the microscopic transsphenoidal operation plays a critical role in preserving the pituitary function and promoting postoperative rehabilitation.

  7. Testicular adrenal rest tumors in adult males with congenital adrenal hyperplasia: evaluation of pituitary-gonadal function before and after successful testis-sparing surgery in eight patients.

    NARCIS (Netherlands)

    Claahsen-van der Grinten, H.L.; Otten, B.J.; Takahashi, S.; Meuleman, E.J.H.; Hulsbergen- van de Kaa, C.A.; Sweep, C.G.J.; Hermus, A.R.M.M.

    2007-01-01

    CONTEXT: In male patients with congenital adrenal hyperplasia (CAH), testicular adrenal rest tumors (TART) are frequently present. These tumors can interfere with testicular function. Intensifying glucocorticoid therapy does not always lead to tumor regression and improvement of testicular function.

  8. Pituitary Apoplexy Presented with Optic Neuritis

    Directory of Open Access Journals (Sweden)

    Mahsa Owji

    2013-07-01

    Full Text Available The patient is a 40-years-old woman presented with visual loss in the right eye since two days ago. The patient complained of headache with gradual onset in the right parietal area since 2 years ago. The headache pattern did not alter.The left eye was normal but the vision in the right eye was 50 cm finger counting. Marcus Gunn pupil could be observed during swinging-flashlight test in the right eye. According to these findings, the first diagnosis was optic neuritis which was corroborated with visual evoked potential (the latency of P100 was 122. According to magnetic resonance imaging (MRI, there was a big cystic tumor in sella turcica extended to the suprasellar region (Figure 1-A. It had a large liquid component. Optic chiasm was under pressure and was displaced (Figure 1-B. A faint enhancement was seen after the injection (Figure 1-C.The patient was operated with the transnasal-transsphenoidal approach. Blood and fibrin were among the small monomorphic round cells andfibro-connective tissue of the pituitary gland. Considering the bleeding inside the pituitary tumor, the final diagnosis was pituitary apoplexy. After recovery from the operation the symptoms were removed.Pituitary apoplexy presents with headache, loss of vision, ophthalmoplegia, and mental alterations which is caused by infarction or sudden bleeding inside the pituitary tumor.1In our review of literature, 3 patients afflicted with pituitary apoplexy presented with optic neuritis were reported.In a study conducted by Petersen et al., all three patients referred to them suffered from unilateral visual loss and headache. They were examined with the early diagnosis of optic neuritis. After taking a Brain Computerized tomography (CT scan, pituitary adenoma together with the formation of cyst were detected in patients. After transsphenoidal adenomectomy, the patient regained full vision. Therefore, the correct diagnosis of these patients, who had been incorrectly diagnosed with

  9. CT of pituitary abscess

    Energy Technology Data Exchange (ETDEWEB)

    Fong, T.C.; Johns, R.D.; Long, M.; Myles, S.T.

    1985-06-01

    Pituitary abscess is a rare condition, with only 50 cases reported in the literature. Of those, 29 cases were well documented for analysis. Preoperative diagnosis of pituitary abscess is difficult. The computed tomographic (CT) appearance of pituitary abscess was first described in 1983; the abscess was depicted by axial images with coronal reconstruction. The authors recently encountered a case of pituitary abscess documented by direct coronal CT of the sella turcica.

  10. Rapid-onset obesity, hypoventilation, hypothalamic dysfunction, autonomic dysregulation and neuroendocrine tumor syndrome with a homogenous enlargement of the pituitary gland: a case report.

    Science.gov (United States)

    Aljabban, Lama; Kassab, Lina; Bakoura, Nour Alhuda; Alsalka, Mohammad Fayez; Maksoud, Ismaeil

    2016-11-22

    Rapid-onset obesity with hypoventilation, hypothalamic dysfunction, and autonomic dysregulation syndrome is a rare pediatric disorder with a variable sequence of clinical presentations, undefined etiology, and high risk of mortality. Our patient presented an unusual course of the disease accompanied by a homogenous mild enlargement of her pituitary gland with an intact pituitary-endocrine axis which, to the best of our knowledge, represents a new finding in rapid-onset obesity with hypoventilation, hypothalamic dysfunction, and autonomic dysregulation syndrome. We present a documented case of a 4 years and 8-month-old Syrian Arabic girl with a distinctive course of signs and symptoms of rapid-onset obesity with hypoventilation, hypothalamic dysfunction, and autonomic dysregulation syndrome accompanied by mature ganglioneuroma in her chest, a homogenous mild enlargement of her pituitary gland, generalized cortical brain atrophy, and seizures. Three months after her first marked symptoms were noted she had a sudden progression of severe respiratory distress that ended with her death. The findings of this case could increase our understanding of the pathogenetic mechanisms of rapid-onset obesity with hypoventilation, hypothalamic dysfunction, and autonomic dysregulation, and place more emphases on pediatricians to consider rapid-onset obesity with hypoventilation, hypothalamic dysfunction, and autonomic dysregulation syndrome whenever early rapid onset of obesity, associated with any malfunction, is observed in children. This knowledge could be lifesaving for children with rapid-onset obesity with hypoventilation, hypothalamic dysfunction, and autonomic dysregulation syndrome.

  11. Compressed sensing recovery via nonconvex shrinkage penalties

    Science.gov (United States)

    Woodworth, Joseph; Chartrand, Rick

    2016-07-01

    The {{\\ell }}0 minimization of compressed sensing is often relaxed to {{\\ell }}1, which yields easy computation using the shrinkage mapping known as soft thresholding, and can be shown to recover the original solution under certain hypotheses. Recent work has derived a general class of shrinkages and associated nonconvex penalties that better approximate the original {{\\ell }}0 penalty and empirically can recover the original solution from fewer measurements. We specifically examine p-shrinkage and firm thresholding. In this work, we prove that given data and a measurement matrix from a broad class of matrices, one can choose parameters for these classes of shrinkages to guarantee exact recovery of the sparsest solution. We further prove convergence of the algorithm iterative p-shrinkage (IPS) for solving one such relaxed problem.

  12. MicroRNAs in Human Pituitary Adenomas

    Directory of Open Access Journals (Sweden)

    Xu-Hui Li

    2014-01-01

    Full Text Available MicroRNAs (miRNAs are a class of recently identified noncoding RNAs that regulate gene expression at posttranscriptional level. Due to the large number of genes regulated by miRNAs, miRNAs play important roles in many cellular processes. Emerging evidence indicates that miRNAs are dysregulated in pituitary adenomas, a class of intracranial neoplasms which account for 10–15% of diagnosed brain tumors. Deregulated miRNAs and their targets contribute to pituitary adenomas progression and are associated with cell cycle control, apoptosis, invasion, and pharmacological treatment of pituitary adenomas. To provide an overview of miRNAs dysregulation and functions of these miRNAs in pituitary adenoma progression, we summarize the deregulated miRNAs and their targets to shed more light on their potential as therapeutic targets and novel biomarkers.

  13. Silencing of HOTAIR expression inhibits the temozolomide-induced apoptosis in pituitary tumor cells%抑制 HOTAIR 的表达促进替莫唑胺引起的垂体腺瘤细胞凋亡

    Institute of Scientific and Technical Information of China (English)

    李九州; 张玉奇; 赵全成; 刘洪恩; 左凯

    2016-01-01

    目的:探索长链非编码RNA(long noncoding RNA ,lncRNA)HOTAIR在替莫唑胺引起的垂体瘤细胞凋亡中的功能。方法体外培养垂体腺瘤细胞系 HP75细胞和GH3细胞,使用替莫唑胺处理 HP75细胞和GH3细胞后,采用实时定量PCR法检测细胞中 HOTAIR的表达;采用RNA干扰(RNA interference ,RNAi)技术敲低内源性 HOTAIR的表达;并应用MTT法检测敲低内源性HOTAIR后细胞增殖能力的改变,应用流式细胞术检测敲低内源性 HOTAIR后替莫唑胺对垂体腺瘤细胞凋亡的影响。结果替莫唑胺能够引起垂体腺瘤HP75细胞和GH3细胞显著的凋亡,并且在此过程中HOTAIR的表达显著降低;采用RNAi技术能够显著地抑制垂体腺瘤细胞系中HOTAIR的表达;敲低HOTAIR后,细胞的增殖能力受到明显的抑制,如果同时使用替莫唑胺处理细胞,细胞的凋亡率出现显著地升高。结论敲低内源性 HOTAIR的表达能够促进替莫唑胺引起的垂体腺瘤细胞凋亡,二者具有协同作用。%Objective To investigate the effect of long non-coding RNA (lncRNA) HOTAIR on the temozolomide-induced apoptosis of pituitary tumor cells .Methods Pituitary adenoma cell line HP75 cells and GH3 cells were cultured in vitro ,quanti-tative real-time PCR was used to detect the expression level of lncRNA HOTAIR in HP75 cells and GH3 cells after treatment with temozolomide .The HP75 cells and GH3 cells were transfected with siRNA specially targeting HOTAIR to knock endoge-nous HOTAIR down in vitro ;furthermore ,MTT assay was used to detect the proliferation rate in HP75 and GH3 cells ,flow cytometry assay was employed to detect the temozolomide-induced apoptosis in HP75 cells and GH3 cells .Results Temozolo-mide could cause significant apoptosis in pituitary tumor HP75 cells GH3 cells ,at the same time ,the expression of HOTAIR was significantly reduced in cells treated with temozolomide;the expression of HOTAIR could be

  14. Long-term consequences of growth hormone replacement and cranial radiation on pituitary function

    NARCIS (Netherlands)

    Appelman-Dijkstra, Natasha Mireille

    2015-01-01

    This thesis covers the consequences of cranial irradiation of non-pituitary tumors, eg nasopharyngeal carcinoma, on pituitary function. In chapter 2 we have performed a meta-analysis of available data reported in literature on pituitary function after cranial radiotherapy for head and neck and non-p

  15. 乳腺癌新辅助化疗后原发肿瘤退缩模式预测列线图的建立%Establishment of nomograms to predict shrinkage modes of primary breast tumor after neoadj uvant chemotherapy

    Institute of Scientific and Technical Information of China (English)

    刘雁冰; 杨涛; 张朝蓬; 王春建; 孙晓; 孙翔宇; 穆殿斌; 陈兆秋; 王永胜

    2014-01-01

    Objective To explore the clinical variables associated with the shrinkage modes of primary breast tumor in women after neoadj uvant chemotherapy (NAC ), and to develop a nomogram for predicting non-concentric shrinkage mode(NCSM).Methods Sixty-one women with pathologically proven solitary invasive ductal carcinoma (ⅡA-ⅢC)were recruited. Breast specimen was prepared with PMSS, and residual tumors were microscopically outlined,scanned and registered by Photoshop CS 5 software.The 3D model of residual tumors was reconstructed with 3D-DOCTOR 4.0 software to evaluate the shrinkage mode.17 factors such as age and body mass index and menopausal status were chosen as independent variables,and the clinic-pathologic shrinkage mode was considered as dependent variable. A Logistic regression model was used to construct the nomogram. Results Primary tumor stage,lymph node down-staging, PR and mammographic malignant calcification before NAC were independent predictors of clinic-pathologic shrinkage mode (β:1.538,OR:4.656,95%CI:1.414-15.328,P=0.011;β:1.555,OR:4.735, 95%CI:1.082-20.722,P=0.039;β:-1.707, OR:0.181, 95%CI:0.044-0.741,P = 0.017;β:- 1.405, OR:3.808, 95% CI:0.06 - 0.998,P = 0.048, respectively ). The nomogram predicting the risk of NCSM showed a good concordance index(0.869),and its conformity of mean absolute error was 0.039. Conclusion Based on the clinicopathological findings of primary breast tumor, a nomogram to predict shrinkage modes after NAC in breast carcinoma patients is constructed.The statistical tool is helpful for individually selecting the patients who can be treated with BCT after NAC.%目的:探讨乳腺癌新辅助化疗(NAC)后原发肿瘤退缩模式的影响因素,构建非向心性退缩的预测列线图。方法:选择61例ⅡA-ⅢC期乳腺浸润性导管癌患者作为研究对象, NAC后手术标本制作次连续病理大切片,显微镜下勾画残余肿瘤范围,Photoshop CS 5软件配准,3D-DOCTOR 4.0

  16. MR imaging of pituitary hyperplasia in a child with growth arrest and primary hypothyroidism

    Energy Technology Data Exchange (ETDEWEB)

    Papakonstantinou, O.; Bakantaki, A.; Papadaki, E.; Gourtsoyiannis, N. [Dept. of Radiology, Medical School, University of Crete, Heraklion (Greece); Bitsori, M.; Mamoulakis, D. [Dept. of Pediatrics, Medical School, University of Crete, Heraklion (Greece)

    2000-03-01

    Magnetic resonance imaging of pituitary hyperplasia has been rarely described in children with primary hypothyroidism. We report a case of pituitary hyperplasia in a child presented with significant growth arrest and laboratory evidence of hypothyroidism. Magnetic resonance imaging revealed symmetrical pituitary enlargement simulating macroadenoma. After thyroid hormone replacement therapy, the child's height increased and pituitary enlargement regressed to normal. Awareness of MRI appearance of pituitary hyperplasia in children with laboratory evidence of hypothyroidism might avoid misdiagnosis for pituitary tumor, which may also manifest as growth disorder, obviating unnecessary surgery. (orig.)

  17. Shrinkage assessment of low shrinkage composites using micro-computed tomography.

    Science.gov (United States)

    Hirata, Ronaldo; Clozza, Emanuele; Giannini, Marcelo; Farrokhmanesh, Ehsan; Janal, Malvin; Tovar, Nick; Bonfante, Estevam A; Coelho, Paulo G

    2015-05-01

    The aim of this study was to quantify the polymerization volumetric shrinkage of one regular and two low shrinkage bulk fill composites in class I cavities with or without an adhesive layer, using three-dimensional (3D) micro-computed tomography (μCT). Class I cavity preparations (2.5 mm depth × 4 mm length × 4 mm wide) were standardized in 36 extracted human third molars, which were randomly divided in six groups (n = 6 each) as follows: Group VIT (regular composite without bonding agent); Group SDR (low shrinkage flowable composite without bonding agent); Group TET (low shrinkage composite without bonding agent); Group VIT/P (regular composite with bonding agent); Group SDR/X (low shrinkage flowable composite with bonding agent); TET/T (low shrinkage composite with bonding agent). Each tooth was scanned via µCT at cavity preparation, immediately after cavity filling, and after light-curing. Acquired μCT data were imported into Amira software for analysis and volume values evaluated between steps from cavity preparation until light-curing. Both low shrinkage composites showed a significantly less volumetric shrinkage than VIT. The use of dental adhesive significantly decreased the average volumetric contraction similarly for the three composites, by about 20%. Both low shrinkage composites showed less volumetric polymerization contraction than the regular composite. The use of dental adhesive decreased the total volumetric shrinkage for all evaluated composites. © 2014 Wiley Periodicals, Inc.

  18. Breast Cancer Metastasis to Pituitary Infandibulum

    Directory of Open Access Journals (Sweden)

    Maryam Poursadegh Fard

    2011-06-01

    Full Text Available Metastasis from breast cancer to other parts of the body is very common, but the spread of the tumor to pituitary gland, especially to infandibulum, is a rare presentation. At the time of pituitary metastasis, a majority of the patients have clinical and radiological evidence of the disease. It seems that the posterior area of the gland is the most common site of metastasis, probably due to highly rich blood supply through the hypophyseal artery. The present report introduces a case of a 55-years-old woman presented with diabetes insipidus resulting from metastasis of the tumor to pituitary infandibulum, which is a rare site for metastasis, without significant complaint resulting from metastasis to other part of the body, or other primary diseases. Further evaluation revealed that in spite of previous reports, which metastasis usually happens in end stage of cancer, the patients had primary breast cancer. In subsequent evaluations of the case, hypofunction of adenohypophysis was also detected

  19. The tissue shrinkage phenomenon on surgical margins in oral and oropharyngeal squamous cell carcinoma

    Institute of Scientific and Technical Information of China (English)

    David González-Ballester

    2016-01-01

    Aim: One of the most important factors associated with recurrence rate and overall survival is the status of surgical margin of resection free of disease. However, sometimes, the margins measured intra-operatively at the time of surgery differ of those measured by the pathologist in the histopathologic analysis. Faced with this dilemma, a literature review of the best available evidence was conducted in an attempt to determine how the phenomenon of tissue shrinkage may influence on the surgical margin of resection in patients undergoing oral and oropharyngeal squamous cell carcinoma (SCC).Methods: An electronic and manual search was conducted by one reviewer. A combination of controlled Medical Subjects Headings and keywords were used as search strategy. Inclusion and exclusion criteria were established.Results: Finally, after an exhaustive selection process, four articles fulfilled the inclusion criteria and were analyzed. All articles reported a decrease of surgical margin after resection. The tumor site and tumor stage seem to influence in degree of margin shrinkage.Conclusion:Tissue shrinkage on surgical margins of resection in oral SCC is a tangible phenomenon. There is a significant discrepancy between margins measured intraoperatively previous to resection and margins measured by pathologist after histologic processing. The highest percentage of retraction occurs at the time of resection. Margin shrinkage based on tumor site and tumor stage should be considered by any oncologic surgeon to ensure adequate margins of resection cleared of tumor.

  20. The various MRI patterns of pituitary apoplexy

    Energy Technology Data Exchange (ETDEWEB)

    Piotin, M. [Department of Radiology, Montreal Neurological Hospital and Institute (Canada)]|[Department of Diagnostic and Interventional Radiology, Geneva University Hospital (Switzerland); Tampieri, D.; Garant, M.; Melanson, D. [Department of Radiology, Montreal Neurological Hospital and Institute (Canada); Ruefenacht, D.A.; Delavelle, J. [Department of Diagnostic and Interventional Radiology, Geneva University Hospital (Switzerland); Mohr, G. [Department of Neurosurgery, Sir Mortimer B. Davis Jewish General Hospital, Montreal (Canada); Del Carpio, R. [Department of Radiology, Montreal General Hospital, Montreal (Canada); Robert, F. [Department of Pathology, Sir Mortimer B. Davis Jewish General Hospital, H3T 1E2 Montreal (Canada)

    1999-06-01

    The aim of this study was to describe the various MRI features, in correlation to surgical and pathological findings, in patients who presented with pituitary apoplexy (PA). Eleven patients presenting with PA, were evaluated with various MR protocols including spin-echo (SE) T1-weighted sequences in 9 of 11 patients, post gadolinium SE T1-weighted sequences in only 8 of 11 patients, and with T2-weighted SE sequences in 2 of 11 patients. All patients had transsphenoidal pituitary surgery after MR studies. The severity of presenting symptoms ranged from headaches to coma. Ten patients had pituitary macroadenoma; one had a non-hemorrhagic metastatic lesion into a non-adenomatous pituitary gland. Of the 11 patients, one was studied at the acute stage of PA (1 day after onset), 9 at the subacute period (3-15 days after onset), and one at the late stage (5 months after onset). Images compatible with intratumoral hemorrhage were found in all macroadenomas, whereas the metastatic pituitary lesion did not show evidence of bleeding. All gadolinium-enhanced studies showed partial tumoral enhancement. The SE T2-weighted studies demonstrated areas of low and high signal intensities in keeping with the presence of blood degradation contents. Pituitary apoplexy present with different MR features, including hemorrhagic and non-hemorrhagic characteristics on T1-weighted images. Gadolinium-enhanced images do not provide complementary diagnostic information when the presence of blood is assessed on plain images. (orig.) With 4 figs., 2 tabs., 27 refs.

  1. Hormone-dependent shrinkage of a sphenoid wing meningioma after pregnancy: case report.

    Science.gov (United States)

    Kerschbaumer, Johannes; Freyschlag, Christian F; Stockhammer, Günter; Taucher, Susanne; Maier, Hans; Thomé, Claudius; Seiz-Rosenhagen, Marcel

    2016-01-01

    Meningiomas are known to be associated with female sex hormones. Worsening neurological symptoms or newly diagnosed meningiomas have been described in the context of elevated levels of sex hormones, for example, in pregnancy. To the authors' knowledge, tumor shrinkage after the normalization of hormones has not been described, even if it is known that neurological deficits due to meningioma compression may improve after giving birth. A 32-year-old female patient presented with severe headache and vision disturbances at the end of her second pregnancy. Magnetic resonance imaging revealed an extended mass at the lateral left-sided sphenoid wing that was suspected to be a meningioma. After delivery, the patient's symptoms improved, and MRI obtained 2 months postpartum showed significant shrinkage of the lesion. Significant tumor shrinkage can occur after pregnancy. Thus, repeat imaging is indicated in these patients.

  2. A Shrinkage Estimator for Combination of Bioassays

    Institute of Scientific and Technical Information of China (English)

    Jian Xiong; D.G. Chen; Zhen-hai Yang

    2007-01-01

    A shrinkage estimator and a maximum likelihood estimator are proposed in this paper for combination of bioassays. The shrinkage estimator is obtained in closed form which incorporates prior information just on the common log relative potency after the homogeneity test for combination of bioassays is accepted. It is a practical improvement over other estimators which require iterative procedure to obtain the estimator for the relative potency. A real data is also used to show the superiorities for the newly-proposed procedures.

  3. Volumetric polymerization shrinkage of contemporary composite resins

    Directory of Open Access Journals (Sweden)

    Halim Nagem Filho

    2007-10-01

    Full Text Available The polymerization shrinkage of composite resins may affect negatively the clinical outcome of the restoration. Extensive research has been carried out to develop new formulations of composite resins in order to provide good handling characteristics and some dimensional stability during polymerization. The purpose of this study was to analyze, in vitro, the magnitude of the volumetric polymerization shrinkage of 7 contemporary composite resins (Definite, Suprafill, SureFil, Filtek Z250, Fill Magic, Alert, and Solitaire to determine whether there are differences among these materials. The tests were conducted with precision of 0.1 mg. The volumetric shrinkage was measured by hydrostatic weighing before and after polymerization and calculated by known mathematical equations. One-way ANOVA (a or = 0.05 was used to determine statistically significant differences in volumetric shrinkage among the tested composite resins. Suprafill (1.87±0.01 and Definite (1.89±0.01 shrank significantly less than the other composite resins. SureFil (2.01±0.06, Filtek Z250 (1.99±0.03, and Fill Magic (2.02±0.02 presented intermediate levels of polymerization shrinkage. Alert and Solitaire presented the highest degree of polymerization shrinkage. Knowing the polymerization shrinkage rates of the commercially available composite resins, the dentist would be able to choose between using composite resins with lower polymerization shrinkage rates or adopting technical or operational procedures to minimize the adverse effects deriving from resin contraction during light-activation.

  4. Effect study on treating pituitary tumor by microscopic transsphenoidal minimally invasive approach%显微镜下蝶窦入路微创治疗垂体瘤的效果研究

    Institute of Scientific and Technical Information of China (English)

    何志刚; 苏玉涛; 郭立刚; 张文坡

    2016-01-01

    Objective To evaluate the clinical efficacy of pituitary tumor under a microscope nasal transsphenoidal minimally invasive treatment.Methods Retrospective analysis from January 2014 to October 2015 period, our hospital clinical treatment of 32 cases of patients with pituitary tumors, have been applied under the microscope transsphenoidal minimally invasive treatment, their clinical efficacy and surgical points.Results There were 38 patients, 31 cases (81.58%) of all tumor resection, 6 cases (15.79%) and subtotal resection, 1 case (2.63%), partial resection of the primary tumor after symptoms, visual disturbances etc significantly improved; the whole group, the total effective rate was 89.47%, the total effective rate of prolactin and growth hormone adenoma adenoma adenoma was significantly better than corticosteroids and non-functioning adenomas (P<0.05); postoperative prolactinomas PRL and GH growth hormone adenoma patients was significantly lower than preoperative (P<0.05); complication rate was 2.63%.Conclusion patients with pituitary tumors under the microscope transsphenoidal resection treatment rate, good efficacy and fewer complications, is a relatively safe and effective minimally invasive treatment, with good clinical value.%目的:探讨垂体瘤应用显微镜下经鼻蝶窦入路微创治疗的临床疗效。方法回顾分析2014年1月至2015年10月期间,本院收治的38例垂体瘤患者的临床治疗,均应用显微镜下经蝶窦入路微创治疗,分析其临床疗效与手术要点。结果全组38例患者中,31例(81.58%)肿瘤全部切除,6例(15.79%)次全切除,1例(2.63%)部分切除,术后肿瘤原发症状、视力障碍等均显著改善;全组总有效率为89.47%,泌乳素腺瘤及生长激素腺瘤的总有效率均显著优于皮质激素腺瘤以及无功能腺瘤(P<0.05);术后泌乳素腺瘤的PRL及生长激素腺瘤患者的GH较术前显著降低(P<0.05);并发症发生率为2

  5. Mortality in patients with pituitary disease.

    LENUS (Irish Health Repository)

    Sherlock, Mark

    2010-06-01

    Pituitary disease is associated with increased mortality predominantly due to vascular disease. Control of cortisol secretion and GH hypersecretion (and cardiovascular risk factor reduction) is key in the reduction of mortality in patients with Cushing\\'s disease and acromegaly, retrospectively. For patients with acromegaly, the role of IGF-I is less clear-cut. Confounding pituitary hormone deficiencies such as gonadotropins and particularly ACTH deficiency (with higher doses of hydrocortisone replacement) may have a detrimental effect on outcome in patients with pituitary disease. Pituitary radiotherapy is a further factor that has been associated with increased mortality (particularly cerebrovascular). Although standardized mortality ratios in pituitary disease are falling due to improved treatment, mortality for many conditions are still elevated above that of the general population, and therefore further measures are needed. Craniopharyngioma patients have a particularly increased risk of mortality as a result of the tumor itself and treatment to control tumor growth; this is a key area for future research in order to optimize the outcome for these patients.

  6. A pediatric case of pituitary macroadenoma presenting with pituitary apoplexy and cranial nerve involvement: case report

    Science.gov (United States)

    Özçetin, Mustafa; Karacı, Mehmet; Toroslu, Ertuğ; Edebali, Nurullah

    2016-01-01

    Pituitary adenomas usually arise from the anterior lobe of the pituitary gland and are manifested with hormonal disorders or mass effect. Mass effect usually occurs in nonfunctional tumors. Pituitary adenomas may be manifested with visual field defects or rarely in the form of total oculomotor palsy. Visual field defect is most frequently in the form of bitemporal hemianopsia and superior temporal defect. Sudden loss of vision, papilledema and ophthalmoplegia may be observed. Pituitary apoplexy is defined as an acute clinical syndrome characterized with headache, vomiting, loss of vision, ophthalmoplegia and clouding of consciousness. The problem leading to pituitary apoplexy may be decreased blood supply in the adenoma and hemorrhage following this decrease or hemorrhage alone. In this article, we present a patient who presented with fever, vomiting and sudden loss of vision and limited outward gaze in the left eye following trauma and who was found to have pituitary macroadenoma causing compression of the optic chiasma and optic nerve on the left side on cranial and pituitary magnetic resonance imaging.

  7. A pediatric case of pituitary macroadenoma presenting with pituitary apoplexy and cranial nerve involvement: case report.

    Science.gov (United States)

    Özçetin, Mustafa; Karacı, Mehmet; Toroslu, Ertuğ; Edebali, Nurullah

    2016-09-01

    Pituitary adenomas usually arise from the anterior lobe of the pituitary gland and are manifested with hormonal disorders or mass effect. Mass effect usually occurs in nonfunctional tumors. Pituitary adenomas may be manifested with visual field defects or rarely in the form of total oculomotor palsy. Visual field defect is most frequently in the form of bitemporal hemianopsia and superior temporal defect. Sudden loss of vision, papilledema and ophthalmoplegia may be observed. Pituitary apoplexy is defined as an acute clinical syndrome characterized with headache, vomiting, loss of vision, ophthalmoplegia and clouding of consciousness. The problem leading to pituitary apoplexy may be decreased blood supply in the adenoma and hemorrhage following this decrease or hemorrhage alone. In this article, we present a patient who presented with fever, vomiting and sudden loss of vision and limited outward gaze in the left eye following trauma and who was found to have pituitary macroadenoma causing compression of the optic chiasma and optic nerve on the left side on cranial and pituitary magnetic resonance imaging.

  8. Influence of Shrinkage-Reducing Admixtures on the Development of Plastic Shrinkage Cracks

    DEFF Research Database (Denmark)

    Lura, Pietro; Pease, Bradley Justin; Mazzotta, Guy;

    2007-01-01

    settlement of the concrete and tensile stress development in the surface of the concrete, which increase the potential for development of plastic shrinkage cracks. Specifically, this paper studies the development of plastic shrinkage cracks in mortars containing a commercially available shrinkage......-reducing admixture (SRA). Mortars containing SRA show fewer and narrower plastic shrinkage cracks than plain mortars when exposed to the same environmental conditions. It is proposed that the lower surface tension of the pore fluid in the mortars containing SRA results in less evaporation, reduced settlement......, reduced capillary tension, and lower crack-inducing stresses at the topmost layer of the mortar....

  9. Development of novel low shrinkage dental nanocomposite

    Science.gov (United States)

    Sun, Yi; Wu, Xiaorong; Liu, Yanju; Xie, Weili; Sun, Shouhua

    2009-07-01

    It has been the focus to develop low shrinkage dental composite resins in recent ten years. A major difficulty in developing low shrinkage dental materials is their deficiency in mechanical properties to clinical use. This paper reviews the present investigations of low shrinkage dental composite resins and attempts to develop a novel system with multifunctional POSS incorporated. In this paper, it is especially interesting to evaluate the influences of shrinkage with different weight percentage of POSS (0~15wt%) incorporated in dental composite resins. Their double bond conversions are evaluated and their microstructures are characterized with Fourier-transform infra-red spectroscopy and X-ray diffraction. Their mechanical properties are also presented in this paper. The results show that the shrinkage of nanocomposites with POSS can be reduced effectively from 3.53% to 2.18%. The mechanical properties of this novel system, such as strength, hardness and toughness, are also enhanced greatly. Especially with 2wt%POSS incorporated, the best integrative improved effects are revealed. The mechanism of shrinkage is discussed.

  10. Internalization of the radioiodinated somatostatin analog [125I-Tyr3]octreotide by mouse and human pituitary tumor cells: increase by unlabeled octreotide

    NARCIS (Netherlands)

    L.J. Hofland (Leo); P.M. van Koetsveld (Peter); M. Waaijers (Marlijn); J. Zuyderwijk; W.A.P. Breeman (Wouter); S.W.J. Lamberts (Steven)

    1995-01-01

    textabstractRecently, we developed a technique that allows the in vivo visualization in man of somatostatin receptor-positive neuroendocrine tumors after i.v. injection of [125I-Tyr3]octreotide or [111In-DTPA-D-Phe1]octreotide. Radiotherapy of such tumors using somatost

  11. Comparison of two heterogeneity correction algorithms in pituitary gland treatments with intensity-modulated radiation therapy; Comparacao de dois algoritmos de correcao de heterogeneidade em tratamentos de tumores de hipofise com radioterapia de intensidade modulada

    Energy Technology Data Exchange (ETDEWEB)

    Albino, Lucas D.; Santos, Gabriela R.; Ribeiro, Victor A.B.; Rodrigues, Laura N., E-mail: lucasdelbem1@gmail.com [Universidade de Sao Paulo (USP), Sao Paulo, SP (Brazil). Faculdade de Medicina. Instituto de Radiologia; Weltman, Eduardo; Braga, Henrique F. [Instituto do Cancer do Estado de Sao Paulo, Sao Paulo, SP (Brazil). Servico de Radioterapia

    2013-12-15

    The dose accuracy calculated by a treatment planning system is directly related to the chosen algorithm. Nowadays, several calculation doses algorithms are commercially available and they differ in calculation time and accuracy, especially when individual tissue densities are taken into account. The aim of this study was to compare two different calculation algorithms from iPlan®, BrainLAB, in the treatment of pituitary gland tumor with intensity-modulated radiation therapy (IMRT). These tumors are located in a region with variable electronic density tissues. The deviations from the plan with no heterogeneity correction were evaluated. To initial validation of the data inserted into the planning system, an IMRT plan was simulated in a anthropomorphic phantom and the dose distribution was measured with a radiochromic film. The gamma analysis was performed in the film, comparing it with dose distributions calculated with X-ray Voxel Monte Carlo (XVMC) algorithm and pencil beam convolution (PBC). Next, 33 patients plans, initially calculated by PBC algorithm, were recalculated with XVMC algorithm. The treatment volumes and organs-at-risk dose-volume histograms were compared. No relevant differences were found in dose-volume histograms between XVMC and PBC. However, differences were obtained when comparing each plan with the plan without heterogeneity correction. (author)

  12. Immediate postoperative complications in transsphenoidal pituitary surgery: A prospective study

    Directory of Open Access Journals (Sweden)

    Tumul Chowdhury

    2014-01-01

    Full Text Available Background: Considering the important role of pituitary gland in regulating various endocrine axes and its unique anatomical location, various postoperative complications can be anticipated resulting from surgery on pituitary tumors. We examined and categorized the immediate postoperative complications according to various tumor pathologies. Materials and Methods: We carried out a prospective study in 152 consecutive patients and noted various postoperative complications during neurosurgical intensive care unit stay (within 48 hrs of hospital stay in patients undergoing transsphenoidal removal of pituitary tumors. Results: In our series, various groups showed different postoperative complications out of which, cerebrospinal fluid leak was the commonest followed by diabetes insipidus, postoperative nausea and vomiting, and hematoma at operation site. Conclusion: Various immediate postoperative complications can be anticipated in transsphenoidal pituitary surgery even though, it is considered to be relatively safe.

  13. MRI of the hypothalamic-pituitary axis in children

    Energy Technology Data Exchange (ETDEWEB)

    Argyropoulou, Maria I. [University of Ioannina, Department of Radiology, Medical School, Ioannina (Greece); Kiortsis, Dimitrios Nikiforos [University of Ioannina, Department of Physiology, Medical School, Ioannina (Greece)

    2005-11-01

    In childhood, the MR characteristics of the normal pituitary gland are well established. During the first 2 months of life the adenohypophysis demonstrates high signal. Pituitary gland height (PGH) decreases during the 1st year of life and then increases, reaching a plateau after puberty. The magnetization transfer ratio (MTR) increases in both sexes up to the age of 20 years. On dynamic contrast-enhanced studies, the posterior pituitary lobe enhances simultaneously with the straight sinus, and the adenohypophysis later, but within 30 s. In genetically determined dysfunctional states, the adenohypophysis may be normal, hypoplastic, or enlarged. Pituitary enlargement, observed in Prop 1 gene mutations, is characterized by a mass interposed between the anterior and posterior lobes. An ectopic posterior lobe (EPP), associated with a hypoplastic or absent pituitary stalk, may be observed in patients with hypopituitarism. Tumors of the hypothalamic-pituitary (HP) axis may be the origin of adenohypophyseal deficiencies. A small hypointense adenohypophysis is found in iron overload states and is often associated with hypogonadotrophic hypogonadism. Absence of the posterior lobe bright signal, with or without a thick pituitary stalk or a mass at any site from the median eminence to the posterior pituitary lobe, may be found in diabetes insipidus. Hydrocephalus, suprasellar arachnoid cysts, hypothalamic hamartomas and craniopharyngiomas may result in central precocious puberty (CPP). Increased PGH in girls with idiopathic CPP is useful for its differential diagnosis from premature thelarche (PT). Pituitary adenomas, observed mainly in adolescents, present the same MR characteristics as those in adults. (orig.)

  14. Familial isolated pituitary adenomas (FIPA) and the pituitary adenoma predisposition due to mutations in the aryl hydrocarbon receptor interacting protein (AIP) gene.

    Science.gov (United States)

    Beckers, Albert; Aaltonen, Lauri A; Daly, Adrian F; Karhu, Auli

    2013-04-01

    Pituitary adenomas are one of the most frequent intracranial tumors and occur with a prevalence of approximately 1:1000 in the developed world. Pituitary adenomas have a serious disease burden, and their management involves neurosurgery, biological therapies, and radiotherapy. Early diagnosis of pituitary tumors while they are smaller may help increase cure rates. Few genetic predictors of pituitary adenoma development exist. Recent years have seen two separate, complimentary advances in inherited pituitary tumor research. The clinical condition of familial isolated pituitary adenomas (FIPA) has been described, which encompasses the familial occurrence of isolated pituitary adenomas outside of the setting of syndromic conditions like multiple endocrine neoplasia type 1 and Carney complex. FIPA families comprise approximately 2% of pituitary adenomas and represent a clinical entity with homogeneous or heterogeneous pituitary adenoma types occurring within the same kindred. The aryl hydrocarbon receptor interacting protein (AIP) gene has been identified as causing a pituitary adenoma predisposition of variable penetrance that accounts for 20% of FIPA families. Germline AIP mutations have been shown to associate with the occurrence of large pituitary adenomas that occur at a young age, predominantly in children/adolescents and young adults. AIP mutations are usually associated with somatotropinomas, but prolactinomas, nonfunctioning pituitary adenomas, Cushing disease, and other infrequent clinical adenoma types can also occur. Gigantism is a particular feature of AIP mutations and occurs in more than one third of affected somatotropinoma patients. Study of pituitary adenoma patients with AIP mutations has demonstrated that these cases raise clinical challenges to successful treatment. Extensive research on the biology of AIP and new advances in mouse Aip knockout models demonstrate multiple pathways by which AIP may contribute to tumorigenesis. This review assesses

  15. Pituitary cell differentiation from stem cells and other cells: toward restorative therapy for hypopituitarism?

    Science.gov (United States)

    Willems, Christophe; Vankelecom, Hugo

    2014-01-01

    The pituitary gland, key regulator of our endocrine system, produces multiple hormones that steer essential physiological processes. Hence, deficient pituitary function (hypopituitarism) leads to severe disorders. Hypopituitarism can be caused by defective embryonic development, or by damage through tumor growth/resection and traumatic brain injury. Lifelong hormone replacement is needed but associated with significant side effects. It would be more desirable to restore pituitary tissue and function. Recently, we showed that the adult (mouse) pituitary holds regenerative capacity in which local stem cells are involved. Repair of deficient pituitary may therefore be achieved by activating these resident stem cells. Alternatively, pituitary dysfunction may be mended by cell (replacement) therapy. The hormonal cells to be transplanted could be obtained by (trans-)differentiating various kinds of stem cells or other cells. Here, we summarize the studies on pituitary cell regeneration and on (trans-)differentiation toward hormonal cells, and speculate on restorative therapies for pituitary deficiency.

  16. Cushing-type ectopic pituitary adenoma with unusual pathologic features

    Directory of Open Access Journals (Sweden)

    Kristopher T. Kimmell, MD

    2014-06-01

    Full Text Available Ectopic pituitary adenomas comprise, by varying reports, approximately 1-2% of all pituitary adenomas. They are often located in the nasopharyngeal region associated with the pharyngeal pituitary. The location and pathologic features of these masses make them atypical when compared with intrasellar pituitary adenomas. A 54-year-old man presented with vertebral compression fracture and physical stigmata of Cushing’s disease. Biochemical testing confirmed hypercortisolemia responsive to high dose dexamethasone suppression. MRI of the head demonstrated an enhancing mass in the posterior aspect of the sphenoid sinus not involving the sella turcica. Endoscopic biopsy followed by resection confirmed this mass to be a pituitary adenoma with unusual pathologic features. Most notably, the tumor cells demonstrated large, eosinophilic, vacuolated cytoplasm. Immunohistochemical profile of the tumor was typical of an ACTH secreting tumor, notably with positivity for ACTH. The patient did well from his surgery. Post-operatively his serum cortisol level normalized and he remains in chemical remission one year after surgery. Ectopic pituitary adenomas are an unusual manifestation of hormonally active pituitary neoplastic disease. Their atypical clinical presentations, location, and pathologic features can make them a diagnostic challenge. Clinicians should be aware of these entities, especially when considering differential diagnosis for a mass in the sphenoid sinus and nasopharyngeal region.

  17. Virtual endoscopy in endoscopic pituitary tumor resection through the endonasal transsphenoidal approach%虚拟内镜技术在内镜经鼻蝶入路垂体瘤切除术中的运用

    Institute of Scientific and Technical Information of China (English)

    蒋伟平; 陈祎招; 林波淼; 徐如祥; 王向宇; 罗成义; 李兵

    2011-01-01

    目的 运用虚拟内镜(VE)技术观察内镜经鼻蝶入路的解剖结构,探讨其对内镜经鼻蝶入路垂体瘤切除术的指导价值. 方法 南方医科大学珠江医院神经外科自2007年12月至2010年3月行内镜经鼻蝶入路垂体瘤切除术患者21例,患者术前均采用64排CT扫描及VE图像重建.比较术前VE和术中内镜图像并分析经鼻蝶入路中解剖结构累加分值的相关性. 结果 术前VE图像与术中神经内镜图像非常相似;解剖结构的相符性良好,术前VE和术中内镜下8个解剖结构显示的累加分值具有正相关关系(r=0.923,P=0.001);调整VE的位置可以模拟神经内镜经鼻蝶入路垂体瘤切除术,观察内镜下经鼻蝶入路的解剖结构. 结论 VE能于术前准确直观地显示内镜经鼻蝶入路的重要解剖结构及变异,指导术前计划形成,提高手术效率,增加手术操作的安全性.%Objective To observe the anatomical structure via endonasal transsphenoidal approach with virtual endoscopy (VE) and explore the clinical applications of VE in endoscopic pituitary tumor resection through the endonasal transsphenoidal approach. Methods The VE was applied to the reconstruction of the pre-surgical 64-slice CT scanning of the 21 patients with pituitary adenoma received the endoscopic endonasal transsphenoidal surgery. A comparative study and a correlation analysis of cumulative scores of the anatomical structure were performed between the reconstructed VE images and the intraoperative endoscopic ones. Results Preoperative VE images and intraoperative endoscope images are very similar. The correlation of cumulative scores of the anatomical structure between the VE images of anatomical findings and the intraoperative images was positively noted (r=0.923, P=0.001),indicating that VE can be applied to simulately observe the anatomical structure before the endoscopic endonasal transsphenoidal pituitary surgery, and observe the anatomical structure through

  18. Shrinkage Properties of Cement Stabilized Gravel

    DEFF Research Database (Denmark)

    Lund, Mia Schou Møller; Hansen, Kurt Kielsgaard

    2014-01-01

    Cement stabilized gravel is an attractive material in road construction because its strength prop-erties are accommodating the increasingly higher requirements to the bearing capacity of a base course. However, reflection cracking of cement stabilized gravel is a major concern. In this pa......-per the shrinkage properties of cement stabilized gravel have been documented under various temperature and relative humidity conditions. Two cement contents corresponding to a 28-days compressive strength of 6.2 MPa and 12.3 MPa have been tested and compared. It is found that the coefficient of linear expansion...... for the two cement contents is 9.9 × 10-6 ⁰C-1 and 11.3 × 10-6 ⁰C-1, respectively. Furthermore, it is found that reflecting cracking can mainly be explained by temperature dependent shrinkage rather than moisture dependent shrinkage....

  19. [Cerebral infarction after pituitary apoplexy: Description of a case and review of the literature].

    Science.gov (United States)

    Serramito García, Ramón; Santín Amo, José María; Román Pena, Paula; Pita Buezas, Lara; González Gómez, Lara; García Allut, Alfredo

    Pituitary apoplexy is usually the result of hemorrhagic infarction in a pituitary adenoma. The clinical presentation varies widely and includes asymptomatic cases, classical pituitary apoplexy and even sudden death. Cerebral ischemia due to pituitary apoplexy is very rare. It may be caused by vasospasm or direct compression of cerebral vessels by the tumor. We report a case of pituitary apoplexy associated with cerebral infarction and discuss the relationship between the two events. Copyright © 2016 Sociedad Española de Neurocirugía. Publicado por Elsevier España, S.L.U. All rights reserved.

  20. Predicting difficult laryngoscopy in acromegalic patients undergoing surgery for excision of pituitary tumors: A comparison of extended Mallampati score with modified Mallampati classification

    Directory of Open Access Journals (Sweden)

    Ashish Bindra

    2013-01-01

    Full Text Available Background: There are numerous reports of difficult laryngoscopy and intubation in patients with acromegaly. To date, no study has assessed the application of extended Mallampati score (EMS for predicting difficult intubation in acromegalics. The primary aim of this study was to compare EMS with modified Mallampati classification (MMP in predicting difficult laryngoscopy in acromegalic patients. We hypothesized that since EMS has been reported to be more specific and better predictor than MMP, it may be superior to the MMP to predict difficult laryngoscopy in acromegalic patients. Materials and Methods: For this prospective cohort study with matched controls, acromegalic patients scheduled to undergo pituitary surgery over a period of 3 years (January 2008-December 2010 were enrolled. Preoperative airway assessment was performed by experienced anesthesiologists and involved a MMP and the EMS. Under anesthesia, laryngoscopic view was assessed using Cormack-Lehane (CL grading. MMP and CL grades of I and II were defined "easy" and III and IV as "difficult". EMS grade of I and II were defined "easy" and III as "difficult". Data were used to determine the sensitivity, specificity, positive predictive value, negative predictive value, and accuracy of MMP and EMS in predicting difficult laryngoscopy. Results: Seventy eight patients participated in the study (39 patients in each group. Both MMP and EMS failed to detect difficult laryngoscopy in seven patients. Only one laryngoscopy was predicted to be difficult by both tests which was in fact, difficult. Conclusion: We found that addition of neck extension did not improve the predictive value of MMP.

  1. Angiogenesis in Pituitary Adenomas: Human Studies and New Mutant Mouse Models

    Directory of Open Access Journals (Sweden)

    Carolina Cristina

    2014-01-01

    Full Text Available The role of angiogenesis in pituitary tumor development has been questioned, as pituitary tumors have been usually found to be less vascularized than the normal pituitary tissue. Nevertheless, a significantly higher degree of vasculature has been shown in invasive or macropituitary prolactinomas when compared to noninvasive and microprolactinomas. Many growth factors and their receptors are involved in pituitary tumor development. For example, VEGF, FGF-2, FGFR1, and PTTG, which give a particular vascular phenotype, are modified in human and experimental pituitary adenomas of different histotypes. In particular, vascular endothelial growth factor, VEGF, the central mediator of angiogenesis in endocrine glands, was encountered in experimental and human pituitary tumors at different levels of expression and, in particular, was higher in dopamine agonist resistant prolactinomas. Furthermore, several anti-VEGF techniques lowered tumor burden in human and experimental pituitary adenomas. Therefore, even though the role of angiogenesis in pituitary adenomas is contentious, VEGF, making permeable pituitary endothelia, might contribute to adequate temporal vascular supply and mechanisms other than endothelial cell proliferation. The study of angiogenic factor expression in aggressive prolactinomas with resistance to dopamine agonists will yield important data in the search of therapeutical alternatives.

  2. Identification of microcracks caused by autogenous shrinkage

    DEFF Research Database (Denmark)

    Lura, Pietro; Jensen, Ole Mejlhede; Guang, Ye

    2005-01-01

    Detection and quantification of microcracks caused by restrained autogenous shrinkage in high-performance concrete is difficult. Available techniques either lack the required resolution or may cause further cracks indistinguishable from the original ones. The new technique presented in this paper...... microscopy, electron probe micro analysis, EPMA, and scanning electron microscopy, SEM. A preliminary analysis of the observed microcracks is presented in this paper....

  3. The pathology of pituitary adenomas from a clinical perspective.

    Science.gov (United States)

    Dworakowska, Dorota; Korbonits, Marta; Aylwin, Simon; McGregor, Alan; Grossman, Ashley B

    2011-01-01

    Pituitary adenomas present with a variety of clinical endocrine manifestations and arise in a sporadic setting or rarely as part of hereditary genetic syndromes. Molecular analysis of familial pituitary adenomas has provided significant insight into pituitary tumorigenesis. Some specific genes have been identified that predispose to pituitary neoplasia, but these are rarely involved in the pathogenesis of sporadic tumors. The number of identified genes involved in pituitary tumorigenesis is progressively increasing. The possible resulting mechanisms of action involve abnormalities in signal transduction pathways, cell cycle regulators, growth factors, chromosome stability and others. Further studies are needed to evaluate the clinical significance of genetic alterations and their implications for patient prognosis, as well as to identify targets for existing and new therapeutic options. The aim of this review is to focus on the molecular pathology of pituitary adenomas from a practical perspective and discuss the possible clinical implications which may relate to particular molecular alterations. We have summarised familial syndromes related to pituitary adenomas and considered the prognostic value of selected molecular alterations in these tumors.

  4. Adenomas hipofisários: relação entre invasividade e índice proliferativo tumoral Pituitary adenomas: relationship between invasiveness and proliferative cell nuclear index

    Directory of Open Access Journals (Sweden)

    OSWALDO INÁCIO DE TELLA JR

    2000-12-01

    Full Text Available Analisamos 76 pacientes com adenomas hipofisários do ponto de vista clínico, radiológico e tratamento cirúrgico. Todos os casos foram estudados por imuno-histoquímica e em 49 pacientes foi pesquisado o anticorpo monoclonal PCNA. Os adenomas bi-hormonais foram os mais frequentes seguidos dos prolactinomas e os adenomas não secretantes. Os adenomas bi-hormonais não secretantes e os produtores de subunidade alfa foram proporcionalmente mais invasivos pelos critérios radiológicos. A maioria dos pacientes (59 foi operada por via transeptoesfenoidal, em seis casos a via transcraniana foi realizada e em 11 pacientes houve necessidade das duas abordagens. A ressecção foi total em 32 pacientes, a maioria em microadenomas, subtotal em 15 e parcial em 29. A complicação endócrina mais frequente foi diabetes insipidus. Houve tendência de associação positiva para os adenomas secretantes e PCNA mais elevado, assim como relação positiva quando analisamos os adenomas invasivos pela tomografia computadorizada ou ressonância magnética e o PCNA 3 e 4. A melhora visual foi observada em 85% dos macroadenomas, mesmo quando a ressecção foi parcial ou subtotal.We evaluated clinically, radiologically and surgically a series of 76 pituitary adenomas. All cases were assessed immunohistochemically and in 49 patients the PCNA monoclonal antibody was measured. The most frequent types found were the bihormonal adenomas, followed by prolactinomas and non secreting adenomas. The bihormonal adenomas, non secreting adenonas and the sub unit alfa producing adenomas were proportionally more invase as determined by radiological criteria (CTscan or MRI. In 59 patients a transphenoidal approach was used, six cases were operated on transcranially and in 11 patients we used a combination of both approach. Total resection were achieved in 32 cases, most of which were microadenomas, in 15 cases the resection was subtotal and partial in 29 cases. Diabetes insipidus

  5. A Bayesian Shrinkage Approach for AMMI Models.

    Science.gov (United States)

    da Silva, Carlos Pereira; de Oliveira, Luciano Antonio; Nuvunga, Joel Jorge; Pamplona, Andrezza Kéllen Alves; Balestre, Marcio

    2015-01-01

    Linear-bilinear models, especially the additive main effects and multiplicative interaction (AMMI) model, are widely applicable to genotype-by-environment interaction (GEI) studies in plant breeding programs. These models allow a parsimonious modeling of GE interactions, retaining a small number of principal components in the analysis. However, one aspect of the AMMI model that is still debated is the selection criteria for determining the number of multiplicative terms required to describe the GE interaction pattern. Shrinkage estimators have been proposed as selection criteria for the GE interaction components. In this study, a Bayesian approach was combined with the AMMI model with shrinkage estimators for the principal components. A total of 55 maize genotypes were evaluated in nine different environments using a complete blocks design with three replicates. The results show that the traditional Bayesian AMMI model produces low shrinkage of singular values but avoids the usual pitfalls in determining the credible intervals in the biplot. On the other hand, Bayesian shrinkage AMMI models have difficulty with the credible interval for model parameters, but produce stronger shrinkage of the principal components, converging to GE matrices that have more shrinkage than those obtained using mixed models. This characteristic allowed more parsimonious models to be chosen, and resulted in models being selected that were similar to those obtained by the Cornelius F-test (α = 0.05) in traditional AMMI models and cross validation based on leave-one-out. This characteristic allowed more parsimonious models to be chosen and more GEI pattern retained on the first two components. The resulting model chosen by posterior distribution of singular value was also similar to those produced by the cross-validation approach in traditional AMMI models. Our method enables the estimation of credible interval for AMMI biplot plus the choice of AMMI model based on direct posterior

  6. A Bayesian Shrinkage Approach for AMMI Models.

    Directory of Open Access Journals (Sweden)

    Carlos Pereira da Silva

    Full Text Available Linear-bilinear models, especially the additive main effects and multiplicative interaction (AMMI model, are widely applicable to genotype-by-environment interaction (GEI studies in plant breeding programs. These models allow a parsimonious modeling of GE interactions, retaining a small number of principal components in the analysis. However, one aspect of the AMMI model that is still debated is the selection criteria for determining the number of multiplicative terms required to describe the GE interaction pattern. Shrinkage estimators have been proposed as selection criteria for the GE interaction components. In this study, a Bayesian approach was combined with the AMMI model with shrinkage estimators for the principal components. A total of 55 maize genotypes were evaluated in nine different environments using a complete blocks design with three replicates. The results show that the traditional Bayesian AMMI model produces low shrinkage of singular values but avoids the usual pitfalls in determining the credible intervals in the biplot. On the other hand, Bayesian shrinkage AMMI models have difficulty with the credible interval for model parameters, but produce stronger shrinkage of the principal components, converging to GE matrices that have more shrinkage than those obtained using mixed models. This characteristic allowed more parsimonious models to be chosen, and resulted in models being selected that were similar to those obtained by the Cornelius F-test (α = 0.05 in traditional AMMI models and cross validation based on leave-one-out. This characteristic allowed more parsimonious models to be chosen and more GEI pattern retained on the first two components. The resulting model chosen by posterior distribution of singular value was also similar to those produced by the cross-validation approach in traditional AMMI models. Our method enables the estimation of credible interval for AMMI biplot plus the choice of AMMI model based on direct

  7. Dynamic computed tomography of the pituitary gland using a single slice scanner in dogs with pituitary-dependent hypercortisolism.

    Science.gov (United States)

    Del Magno, Sara; Grinwis, Guy C M; Voorhout, George; Meij, Björn P

    2016-08-01

    Selective removal of the pituitary adenoma has not been advocated in dogs with pituitary-dependent hypercortisolism because the pituitary adenoma is usually not visualized on routine computed tomography (CT). Dynamic pituitary CT scanning is aimed at the detection of the pituitary flush and, indirectly, at the presence and position of the adenoma. The first aim of this retrospective study was to compare findings of a multiple slice dynamic scanning protocol with those of a single slice dynamic protocol using a single slice CT scanner. The second aim was to compare the CT findings with surgical findings, and surgical findings with histopathological findings. Computed tomography with single and multiple slice dynamic scanning protocols was performed in 86 dogs with pituitary-dependent hypercortisolism. Thirty dogs underwent transsphenoidal hypophysectomy and pituitary specimens were collected as tumor, normal, mixed and neurohypophyseal samples and processed for histology. The pituitary flush was not detected more frequent in multiple slice dynamic scanning series than in single slice dynamic scanning series. However, in non-enlarged pituitaries, the flush was seen significantly more frequently than in enlarged pituitaries. Prediction of the nature of the tissue during hypophysectomy by the surgeon was inconclusive. In conclusion, when using a single slice CT scanner, both single or multiple slice dynamic scanning protocols can be used for localization of the neurohypophyseal flush, and, indirectly, the adenoma. However, based on this study, the aim of surgery in dogs with pituitary-dependent hypercortisolism remains total adenohypophysectomy, and when the neurophypophysis is recognized, it may be left in situ.

  8. Human pituitary tissue secretes a potent growth factor for chondrocyte proliferation.

    Science.gov (United States)

    Kasper, S; Friesen, H G

    1986-01-01

    We report the secretion from human pituitary tumor fragments in organ culture of a potent mitogen for chondrocyte proliferation. Primary human pituitary cell and organ cultures were established from pituitary fragments obtained from patients with acromegaly, prolactinomas, and nonfunctional adenomas. The conditioned culture medium contained a mitogenic factor(s) that stimulated rabbit fetal chondrocyte proliferation, causing up to an 8-fold increase in cell number when added to Ham's F-10 medium in the presence of 10% fetal bovine serum. Blood leaking into the surgical field after the adenomectomy is known to contain very high concentrations of pituitary hormones. Serum samples, obtained from this venous "ooze" collected at the site of pituitary surgery, also were found to contain chondrocyte growth-promoting activity. Some venous serum samples stimulated chondrocyte proliferation in a dose-dependent manner down to a 1:10 dilution of 1 microliter serum, indicating that the material being secreted was very potent indeed. Gel filtration on Sephadex G-100 and analytical gel isoelectric focusing of culture media or serum samples from the pituitary fossa demonstrated that the growth factor secreted from the pituitary tumor fragments as well as from the venous serum is similar, if not identical, to chondrocyte growth factor (mol wt, 43,000; pI 7.6-7.9) purified from human pituitaries collected at autopsy. These results suggest that the chondrocyte growth-promoting factor(s) may not only be secreted by pituitary tumor fragments but by normal human pituitary tissue as well.

  9. Endoscopic endonasal trans-sphenoid surgery of pituitary adenoma

    OpenAIRE

    Yadav, Y. R.; Sachdev, S.; Parihar, V.; H Namdev; P R Bhatele

    2012-01-01

    Endoscopic endonasal trans-sphenoid surgery (EETS) is increasingly used for pituitary lesions. Pre-operative CT and MRI scans and peroperative endoscopic visualization can provide useful anatomical information. EETS is indicated in sellar, suprasellar, intraventricular, retro-infundibular, and invasive tumors. Recurrent and residual lesions, pituitary apoplexy and empty sella syndrome can be managed by EETS. Modern neuronavigation techniques, ultrasonic aspirators, ultrasonic bone curette can...

  10. MR imaging of pituitary dwarfism

    Energy Technology Data Exchange (ETDEWEB)

    Kashimada, Akio; Machida, Kikuo; Honda, Norinari; Mamiya, Toshio; Takahashi, Taku; Kamano, Tsuyoshi; Muramatsu, Masayuki; Inoue, Yusuke (Saitama Medical School, Kawagoe (Japan). Medical Center)

    1993-02-01

    Pituitary MR imaging was performed in 32 patients with clinically diagnosed pituitary dwarfism and 12 normal controls. The patients were divided into two groups according to the severity of pituitary dwarfism based on endocrinological data. The two patients with severe dwarfism showed transection of the pituitary stalk, ectopic posterior lobe and atrophy of the anterior lobe on MR imaging, while the 27 patients with mild dwarfism showed no abnormal MR findings of the pituitary gland. The former group corresponds to typical pituitary dwarfism and the latter to partial GH deficiency, which was recently proposed as another type of pituitary dwarfism. In conclusion, pituitary MR imaging may differentiate partial GH deficiency from typical (stalk-transected) pituitary dwarfism. (author).

  11. Polymerization shrinkage, flexural and compression properties of low-shrinkage dental resin composites.

    Science.gov (United States)

    Park, Jeong-Kil; Lee, Geun-Ho; Kim, Jong-Hwa; Park, Mi-Gyoung; Ko, Ching-Chang; Kim, Hyung-Il; Kwon, Yong Hoon

    2014-01-01

    This study evaluated the polymerization shrinkage, flexural and compressive properties of low-shrinkage resin composites. For the study, four methacrylate-based and one silorane-based resin composites were light cured using three different light-curing units (LCUs) and their polymerization shrinkage, flexural (strength (FS) and modulus (FM)) and compressive (strength (CS) and modulus (CM)) properties were evaluated. Data were statistically analyzed using ANOVA and a post-hoc Tukey test. The polymerization shrinkage ranged approximately 7.6-14.2 μm for 2-mm thick specimens depending on the resin product and LCU. Filtek LS showed the least shrinkage while the rest shrank approximately 13.2-14.2 μm. However, Filtek LS showed the greatest shrinkage difference for the used LCUs. FS and CS of the tested specimens ranged 96.2-152.1 MPa and 239.2-288.4 MPa, respectively, depending on the resin product and LCU. The highest and lowest FS and FM were recorded for the methacrylate-based resin composites. Among the specimens, Filtek LS showed the lowest CS and CM.

  12. Tumor

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    2008479 Preliminary study of MR elastography in brain tumors. XU Lei(徐磊), et al.Neurosci Imaging Center, Beijing Tiantan Hosp, Capital Med Univ, Beijing 100050.Chin J Radiol 2008;42(6):605-608. Objective To investigate the potential values of magnetic resonance elastography (MRE) for evaluating the brain tumor consistency in vivo. Methods Fourteen patients with known solid brain tumor (5 male, 9 female; age range: 16-63 years)

  13. Expression of Neuropeptide Y in Human Pituitary Adenoma

    Institute of Scientific and Technical Information of China (English)

    Laizhao Chen; Jingjian Ma; Anchao Zheng; Honggang Zheng

    2006-01-01

    OBJECTIVE Neuropeptid e Y (NPY) acts as a neuroendocrine modulator in the anterior pituitary, and NPY mRNA and NPY-immunoreactivity have been detected in normal human anterior pituitaries. However, only a few studies of NPY expression in human pituitary adenomas have been published. Our study was conducted to determine whether or not adenomatous cells express NPY, to investigate the relationship between NPY expression and the subtypes of pituitary adenoma and to explore the clinical significance of NPY.METHODS The study included tissues from 58 patients with pituitary adenomas who underwent surgery because of their clinical diagnosis.Using a highly specific anti-NPY polyclonal antibody, immunohistochemical analysis was performed on the surgically removed pituitary adenomas. Six fresh specimens also were examined using immuno-electron microscopy. NPY was labeled with colloidal gold in order to study the distribution of NPY at the subcellular level.RESULTS The NPY expression level was significantly different among subgroups of pituitary adenomas (P<0.05). NPY was immuno-detected in 58.6% of all adenomas, in 91.7% of gonadotrophic adenomas and in 14.3% of prolactinomas. NPY expression was slightly lower in invasive pituitary adenomas compared to noninvasive adenomas, but the difference was not significant (t=1.81, P>0.05). Of particular interest was the finding that vascular endothelial cells showed positive NPY expression in some pituitary adenomas. Parts of strongly positive tumor cells were seen in channels formed without endothelial cells, but which contained some red blood cells in a formation similar to so-called vasculogenic mimicry. Immuno-electron microscopy demonstrated that 4 of the 6 fresh specimens displayed positive NPY staining with a high density of gold particles located mainly in the secretory granulas. In addition, gold particles were sparsely detected in the rough endoplasmic reticulum and cell matrix.CONCLUSION NPY exists in pituitary adenomas

  14. Unusual Complication of Pituitary Macroadenoma: A Case Report and Review

    Science.gov (United States)

    Abbas, Mohamed Said; AlBerawi, Mohamad Najm; Bozom, Issam Al; Shaikh, Nissar F.; Salem, Khalid Yacout

    2016-01-01

    Patient: Male, 48 Final Diagnosis: Pituitary apoplexy complicated by cerebral infarction Symptoms: Disturbed conscious level • loss of vision Medication: — Clinical Procedure: — Specialty: Radiology Objective: Unusual clinical course Background: Pituitary macroadenoma is a common benign tumor that usually presents with visual field defects or hormonal abnormalities. Cerebral infarction can be a complication of a large pituitary adenoma. We report a rare case of bilateral anterior cerebral arteries infarcts by a large pituitary macroadenoma with apoplexy. Case Report: A 48-year-old male patient presented with altered conscious level and sudden loss of vision for one-day duration. Magnetic resonance imaging of the brain showed a large seller and suprasellar hemorrhagic mass of pituitary origin, with associated bilateral areas of diffusion restriction in the frontal parasagittal regions, consistent with infarctions. Magnetic resonance angiography showed elevation and compression of A1 segment of both anterior cerebral arteries by the hemorrhagic pituitary macroadenoma. The patient underwent trans-sphenoidal resection of the pituitary adenoma, but unfortunately, ischemia was irreversible. Computed tomography (CT) done post-operatively showed hypodensity in the frontal and parietal parasagittal areas, which was also persistent in the follow up CT scans. The patient’s neurological function remained poor, with GCS of 8/15, in vegetative state. Conclusions: Vascular complications of the pituitary apoplexy, although uncommon, can be very severe and life threatening. Early detection of vascular compromise caused by hemorrhagic pituitary macroadenoma can prevent delay in intervention. Clinicians should also consider pituitary adenoma as a possible cause of stroke. PMID:27708253

  15. Pituitary infiltration by non-Hodgkin's lymphoma: a case report

    Directory of Open Access Journals (Sweden)

    Aral Ferihan

    2009-11-01

    Full Text Available Abstract Introduction Pituitary adenomas represent the most frequently observed type of sellar masses; however, the presence of a rapidly growing sellar tumor, diabetes insipidus, ophthalmoplegia and headaches in an older patient strongly suggests metastasis to the pituitary. Since the anterior pituitary has a great reserve capacity, metastasis to the pituitary and pituitary involvement in lymphoma are usually asymptomatic. Whereas diabetes insipidus is the most frequent symptom, patients can present with headaches, ophthalmoplegia and bilateral hemianopsia. Case presentation A 70-year-old woman with no previous history of malignancy presented with headaches, right oculomotor nerve palsy and diabetes insipidus. As magnetic resonance imaging revealed a sellar mass involving the pituitary gland and infundibular stalk, which also extended into the right cavernous sinus and sphenoid sinus, the patient underwent an immediate transsphenoidal decompression surgery. Her prolactin was 102.4 ng/ml, whereas her gonadotropic hormone levels were low. A low level of urine osmolality after overnight water deprivation, along with normal plasma osmolality suggested diabetes insipidus. Histological examination revealed that the mass had been the infiltration of a high grade B-cell non-Hodgkin's lymphoma involving respiratory system epithelial cells. Paranasal sinus computed tomography scanning and magnetic resonance imaging of the thorax and abdomen were performed. Since magnetic resonance imaging did not reveal any abnormality, after paranasal sinus computed tomography was performed, we concluded that the primary lymphoma originated from the sphenoid sinus and infiltrated the pituitary. Chemotherapy and radiotherapy to the sellar area were planned, but the patient died and her family did not permit an autopsy. Conclusion Lymphoma infiltration to the pituitary is difficult to differentiate from pituitary adenoma, meningioma and other sellar lesions. To plan the

  16. Discrete multiscale wavelet shrinkage and integrodifferential equations

    Science.gov (United States)

    Didas, S.; Steidl, G.; Weickert, J.

    2008-04-01

    We investigate the relation between discrete wavelet shrinkage and integrodifferential equations in the context of simplification and denoising of one-dimensional signals. In the continuous setting, strong connections between these two approaches were discovered in 6 (see references). The key observation is that the wavelet transform can be understood as derivative operator after the convolution with a smoothing kernel. In this paper, we extend these ideas to the practically relevant discrete setting with both orthogonal and biorthogonal wavelets. In the discrete case, the behaviour of the smoothing kernels for different scales requires additional investigation. The results of discrete multiscale wavelet shrinkage and related discrete versions of integrodifferential equations are compared with respect to their denoising quality by numerical experiments.

  17. Regularized brain reading with shrinkage and smoothing

    OpenAIRE

    Wehbe, Leila; Ramdas, Aaditya; Steorts, Rebecca C.; Shalizi, Cosma Rohilla

    2014-01-01

    Functional neuroimaging measures how the brain responds to complex stimuli. However, sample sizes are modest, noise is substantial, and stimuli are high dimensional. Hence, direct estimates are inherently imprecise and call for regularization. We compare a suite of approaches which regularize via shrinkage: ridge regression, the elastic net (a generalization of ridge regression and the lasso), and a hierarchical Bayesian model based on small area estimation (SAE). We contrast regularization w...

  18. Shrinkage measurement for holographic recording materials

    Science.gov (United States)

    Fernández, R.; Gallego, S.; Márquez, A.; Francés, J.; Navarro Fuster, V.; Neipp, C.; Ortuño, M.; Beléndez, A.; Pascual, I.

    2017-05-01

    There is an increasing demand for new holographic recording materials. One of them are photopolymers, which are becoming a classic media in this field. Their versatility is well known and new possibilities are being created by including new components, such as nanoparticles or dispersed liquid crystal molecules in classical formulations, making them interesting for additional applications in which the thin film preparation and the structural modification have a fundamental importance. Prior to obtaining a wide commercialization of displays based on photopolymers, one of the key aspects is to achieve a complete characterization of them. In this sense, one of the main parameters to estimate and control is the shrinkage of these materials. The volume variations change the angular response of the hologram in two aspects, the angular selectivity and the maximum diffraction efficiency. One criteria for the recording material to be used in a holographic data storage application is the shrinkage, maximum of 0.5%. Along this work, we compare two different methods to measure the holographic recording material shrinkage. The first one is measuring the angle of propagation for both diffracted orders +/-1 when slanted gratings are recorded, so that an accurate value of the grating vector can be calculated. The second one is based on interference measurements at zero spatial frequency limit. We calculate the shrinkage for three different photopolymers: a polyvinyl alcohol acrylamide (PVA/AA) based photopolymer, one of the greenest photopolymers whose patent belongs to the Alicante University called Biophotopol and on the last place a holographic-dispersed liquid crystal photopolymer (H-PDLC).

  19. Progression of an Invasive ACTH Pituitary Macroadenoma with Cushing’s Disease to Pituitary Carcinoma

    Directory of Open Access Journals (Sweden)

    Clarissa Groberio Borba

    2015-01-01

    Full Text Available Pituitary carcinomas are very rare tumors that in most cases produce prolactin and adrenocorticotropic hormone (ACTH. It is a challenge to diagnosis of a pituitary carcinoma before disclosed symptomatic metastasis. We report the case of a female patient with Cushing’s disease who underwent three transsphenoidal surgeries, with pathological findings of common ACTH pituitary adenoma including Ki-67 expression <3%. She achieved hypocortisolism after the 3rd surgery although ACTH levels remained slightly elevated. The patient returned some time later with fast worsening of hypercortisolism. Magnetic resonance imaging showed clivus invasion, which led to a fourth surgery and radiation. This time, immunohistochemistry revealed strong Ki-67 (10% to 15% and p53 expression. Liver and lumbar spine metastases were found on workup. The patient died after few months due to lung infection. Pituitary carcinomas are rare, and the transformation of an ACTH-secreting pituitary adenoma into a carcinoma is exceptional. The difficulty of defining markers for the diagnosis of carcinoma, before metastasis diagnosis, in order to change the management of the disease, is a challenge.

  20. Heterogeneity of secretory granules of silent pituitary adenomas

    DEFF Research Database (Denmark)

    Holck, S; Wewer, U M; Albrechtsen, R

    1988-01-01

    Silent pituitary adenomas were compared with hormonally active tumors taking into account the size, number, and ultrastructural characteristics of secretory granules (SG). The study group (a total of 79 primary pituitary adenomas) comprised 27 silent, 21 growth hormone (GH)-producing-, 16 prolactin...... (PRL)-producing-, 5 GH-PRL-producing- and 10 adrenocorticotropic hormone (ACTH)-producing adenomas. The SG of silent adenomas were significantly smaller than SG in endocrine active adenomas. All hormonally inactive tumors also contained small (mean, 94 nm) specific cytoplasmic granules, designated...... approximately 10 to 50% of the granules in each cell. These granules were not seen in hormonally active tumors and considered therefore diagnostic of silent pituitary adenomas....

  1. Nearest shrunken centroids via alternative genewise shrinkages

    Science.gov (United States)

    Choi, Byeong Yeob; Bair, Eric; Lee, Jae Won

    2017-01-01

    Nearest shrunken centroids (NSC) is a popular classification method for microarray data. NSC calculates centroids for each class and “shrinks” the centroids toward 0 using soft thresholding. Future observations are then assigned to the class with the minimum distance between the observation and the (shrunken) centroid. Under certain conditions the soft shrinkage used by NSC is equivalent to a LASSO penalty. However, this penalty can produce biased estimates when the true coefficients are large. In addition, NSC ignores the fact that multiple measures of the same gene are likely to be related to one another. We consider several alternative genewise shrinkage methods to address the aforementioned shortcomings of NSC. Three alternative penalties were considered: the smoothly clipped absolute deviation (SCAD), the adaptive LASSO (ADA), and the minimax concave penalty (MCP). We also showed that NSC can be performed in a genewise manner. Classification methods were derived for each alternative shrinkage method or alternative genewise penalty, and the performance of each new classification method was compared with that of conventional NSC on several simulated and real microarray data sets. Moreover, we applied the geometric mean approach for the alternative penalty functions. In general the alternative (genewise) penalties required fewer genes than NSC. The geometric mean of the class-specific prediction accuracies was improved, as well as the overall predictive accuracy in some cases. These results indicate that these alternative penalties should be considered when using NSC. PMID:28199352

  2. Fractionated stereotactic radiotherapy in the treatment of pituitary adenomas

    Energy Technology Data Exchange (ETDEWEB)

    Kopp, C.; Theodorou, M.; Poullos, N.; Astner, S.T.; Geinitz, H.; Molls, M. [Technische Univ. Muenchen, Klinikum rechts der Isar (Germany). Klinik und Poliklinik fuer Strahlentherapie und Radiologische Onkologie; Stalla, G.K. [Max-Planck-Institut fuer Psychiatrie, Muenchen (Germany). Klinische Neuroendokrinologie; Meyer, B. [Technische Univ. Muenchen, Klinikum rechts der Isar (Germany). Neurochirurgische Klinik und Poliklinik; Nieder, C. [Nordland Hospital, Bodoe (Norway). Dept. of Oncology and Palliative Medicine; Tromsoe Univ. (Norway). Inst. of Clinical Medicine; Grosu, A.L [Freiburg Univ. (Germany). Klinik fuer Strahlenheilkunde

    2013-11-15

    Purpose: The purpose of this work was to evaluate tumor control and side effects associated with fractionated stereotactic radiotherapy (FSRT) in the management of residual or recurrent pituitary adenomas. Patients and methods: We report on 37 consecutive patients with pituitary adenomas treated with FSRT at our department. All patients had previously undergone surgery. Twenty-nine patients had nonfunctioning, 8 had hormone-producing adenoma. The mean total dose delivered by a linear accelerator was 49.4 Gy (range 45-52.2 Gy), 5 x 1.8 Gy weekly. The mean PTV was 22.8 ccm (range 2.0-78.3 ccm). Evaluation included serial imaging tests, endocrinologic and ophthalmologic examination. Results: Tumor control was 91.9 % for a median follow-up time of 57 months (range 2-111 months). Before FSRT partial hypopituitarism was present in 41 % of patients, while 35 % had anterior panhypopituitarism. After FSRT pituitary function remained normal in 22 %, 43 % had partial pituitary dysfunction, and 35 % had anterior panhypopituitarism. Visual acuity was stable in 76 % of patients, improved in 19 %, and deteriorated in 5 %. Visual fields remained stable in 35 patients (95 %), improved in one and worsened in 1 patient (2.7 %). Conclusion: FSRT is an effective and safe treatment for recurrent or residual pituitary adenoma. Good local tumor control and preservation of adjacent structures can be reached, even for large tumors. (orig.)

  3. HYPONATREMIA AFTER TRANSSPHENIODAL SURGERY OF PITUITARY ADENOMA

    Institute of Scientific and Technical Information of China (English)

    陶蔚; 任祖渊; 苏长保; 王任直; 杨义; 马文斌

    2003-01-01

    Objective. To clarify the frequency, presentation, associated factors, treatment and outcome of hy-ponatremia after transsphenoidal surgery of pituitary adenomas.Methods. Retrospectively reviewed the database of 183 patients who underwent transsphenoidal surgeryof pituitary adenomas between January 1999 and June 2000 in our department.Result.s. 38.8% (71/183) had postoperative hyponatremia. Among them, 59.2% (42/71) appeared onthe 4th to 7th day postoperatively. 59.2% (42/71) presented with nausea, vomiting, headache, dizzi-ness, confusion and weakness. Hyponatremia was related to age, tumor size and adenoma type, but notrelated to sex and degree of resection. Treatment consisted of salt replacement and mild fluid restrictionin 4 patients and salt and fluid replacement in 67 patients. Hyponatremia resolved within 16 days in allthe patients.Conclusions. Hyponatremia often appeared about 7 days after transsphenoidal surgery of pituitary ade-nomas, especially in elderly and patients with macroadenomas and huge pituitary adenomas. The principleof treatment was salt and fluid replacement.

  4. Hemorrhagic chondroid chordoma mimicking pituitary apoplexy

    Energy Technology Data Exchange (ETDEWEB)

    Lee, H.J.; Kalnin, A.J.; Holodny, A.I. [Dept. of Radiology, University Hospital, Newark, NJ (United States); Schulder, M.; Grigorian, A. [Dept. of Neurosurgery, University Hospital, Newark, NJ (United States); Sharer, L.R. [Dept. of Pathology, University Hospital, Newark, NJ (United States)

    1998-11-01

    We describe a hemorrhagic chondroid chordoma involving the sella turcica with suprasellar extension. The CT and MRI appearances mimiked a hemorrhagic pituitary adenoma. Chondroid chordoma is a variant composed of elements of both chordoma and cartilaginous tissue. An uncommon bone neoplasm, located almost exclusively in the spheno-occipital region, it is usually not considered in the differential diagnosis of a tumor with acute hemorrhage in the sellar region. We discuss the clinical and radiological characteristics which may allow one to differentiate chondroid chordoma from other tumors of this area. (orig.) With 3 figs., 9 refs.

  5. Comparative Study of Shrinkage and Non-Shrinkage Model of Food Drying

    Science.gov (United States)

    Shahari, N.; Jamil, N.; Rasmani, KA.

    2016-08-01

    A single phase heat and mass model has always been used to represent the moisture and temperature distribution during the drying of food. Several effects of the drying process, such as physical and structural changes, have been considered in order to increase understanding of the movement of water and temperature. However, the comparison between the heat and mass equation with and without structural change (in terms of shrinkage), which can affect the accuracy of the prediction model, has been little investigated. In this paper, two mathematical models to describe the heat and mass transfer in food, with and without the assumption of structural change, were analysed. The equations were solved using the finite difference method. The converted coordinate system was introduced within the numerical computations for the shrinkage model. The result shows that the temperature with shrinkage predicts a higher temperature at a specific time compared to that of the non-shrinkage model. Furthermore, the predicted moisture content decreased faster at a specific time when the shrinkage effect was included in the model.

  6. Relationship Between Histopathology and Clinical Prognosis of Invasive Pituitary Adenoma

    Institute of Scientific and Technical Information of China (English)

    LIYong; SHUKai; DONGFangyong; WANFeng; LEITing; LILing

    2005-01-01

    Objective: To study the relationship between histopathology and clinical prognosis of invasive pituitary adenoma subjected to transsphenoidal surgery. Methods: The enrolled were 82 patients with invasive pituitary adenomas undergoing transsphenoidal surgery during Jan. 2000 May 2003 in our department with full MR imaging findings, pathology data and follow-up information. The follow-up duration was 5-30 months. Results: MR imaging findings of invasive pituitary adenoma included: depression of the sellar floor, involvement of sphenoid sinus and cavernous sinus, breakthrough of diaphragma sellae,encasement of internal carotid artery, etc. Pathological examination revealed that the invasion rate of dura in sella turcica was the highest among the structures around tumor. Pituitary adenoma apoplexy was found in 20 cases (24.4%). The total removal rate for PRL-secreting adenomas was significantly lower than that for non-secreting adenomas (P<0.01), but non-, GH-, ACTH-secreting adenomas had no significant differences. The recurrence rate of PRL-secreting adenornas was higher than that of non- and GH-secreting adenomas (P<0.05). Conclusion: Among invasive pituitary adenomas, the therapeutic effects of nonand GH-secreting pituitary adenomas are better than that of PRL-secreting adenomas. Invasive biological behaviors of invasive pituitary adenomas result in radical operation failure and postoperative recurrence.

  7. Polymerization shrinkage assessment of dental resin composites: a literature review.

    Science.gov (United States)

    Kaisarly, Dalia; Gezawi, Moataz El

    2016-09-01

    Composite restorations are widely used worldwide, but the polymerization shrinkage is their main disadvantage that may lead to clinical failures and adverse consequences. This review reports, currently available in vitro techniques and methods used for assessing the polymerization shrinkage. The focus lies on recent methods employing three-dimensional micro-CT data for the evaluation of polymerization shrinkage: volumetric measurement and the shrinkage vector evaluation through tracing particles before and after polymerization. Original research articles reporting in vitro shrinkage measurements and shrinkage stresses were included in electronic and hand-search. Earlier methods are easier, faster and less expensive. The procedures of scanning the samples in the micro-CT and performing the shrinkage vector evaluation are time consuming and complicated. Moreover, the respective software is not commercially available and the various methods for shrinkage vector evaluation are based on different mathematical principles. Nevertheless, these methods provide clinically relevant information and give insight into the internal shrinkage behavior of composite applied in cavities and how boundary conditions affect the shrinkage vectors. The traditional methods give comparative information on polymerization shrinkage of resin composites, whereas using three-dimensional micro-CT data for volumetric shrinkage measurement and the shrinkage vector evaluation is a highly accurate method. The methods employing micro-CT data give the researchers knowledge related to the application method and the boundary conditions of restorations for visualizing the shrinkage effects that could not be seen otherwise. Consequently, this knowledge can be transferred to the clinical situation to optimize the material manipulation and application techniques for improved outcomes.

  8. Deregulated E2F activity induces hyperplasia and senescence-like features in the mouse pituitary gland

    DEFF Research Database (Denmark)

    Lazzerini Denchi, Eros; Attwooll, Claire; Pasini, Diego

    2005-01-01

    The retinoblastoma gene, RB1, is one of the most frequently mutated genes in human cancer. Rb heterozygous mice develop pituitary tumors with 100% incidence, and the E2F transcription factors are required for this. To assess whether deregulated E2F activity is sufficient to induce pituitary tumor...

  9. Pituitary stalk lesion in a 13-year-old female.

    Science.gov (United States)

    Zilbermint, Mihail; Ramnitz, Mary S; Lodish, Maya B; Kanaka-Gantenbein, Christina; Kattamis, Antonis; Lyssikatos, Charalampos; Patronas, Nicholas J; Quezado, Martha M; Stratakis, Constantine A

    2014-03-01

    Germinomas presenting with a pituitary stalk lesion and panhypopituitarism are rare in children, and their definite diagnosis is challenging. An invasive diagnostic approach, such as a transsphenoidal biopsy, is often required prior to establishing a treatment regimen. A 13-year-old female presented with 1 year of secondary amenorrhea, fatigue, and progressive thirst with polyuria. Laboratory work-up revealed panhypopituitarism (central hypothyroidism, hypogonadotropic hypogonadism, adrenal insufficiency and central diabetes insipidus). α-Fetoprotein and β-human chorionic gonadotropin were not elevated in serum nor in cerebrospinal fluid. The magnetic resonance imaging (MRI) of the pituitary region showed an enhancing infundibular lesion, extending into the hypothalamus, and infiltrating the pituitary gland. A transsphenoidal biopsy of the infundibular lesion confirmed the diagnosis of germinoma (germ-cell tumor). After appropriate hormone replacement therapy, chemotherapy and low-dose radiation therapy, the patient achieved complete resolution of the pituitary stalk lesion on the MRI.

  10. Pituitary stalk lesion in a 13-year-old female

    Science.gov (United States)

    Zilbermint, Mihail; Ramnitz, Mary S.; Lodish, Maya B.; Kanaka-Gantenbein, Christina; Kattamis, Antonis; Lyssikatos, Charalampos; Patronas, Nicholas J.; Quezado, Martha M.

    2016-01-01

    Germinomas presenting with a pituitary stalk lesion and panhypopituitarism are rare in children, and their definite diagnosis is challenging. An invasive diagnostic approach, such as a transsphenoidal biopsy, is often required prior to establishing a treatment regimen. A 13-year-old female presented with 1 year of secondary amenorrhea, fatigue, and progressive thirst with polyuria. Laboratory work-up revealed panhypopituitarism (central hypothyroidism, hypogonadotropic hypogonadism, adrenal insufficiency and central diabetes insipidus). α-Fetoprotein and β-human chorionic gonadotropin were not elevated in serum nor in cerebrospinal fluid. The magnetic resonance imaging (MRI) of the pituitary region showed an enhancing infundibular lesion, extending into the hypothalamus, and infiltrating the pituitary gland. A transsphenoidal biopsy of the infundibular lesion confirmed the diagnosis of germinoma (germ-cell tumor). After appropriate hormone replacement therapy, chemotherapy and low-dose radiation therapy, the patient achieved complete resolution of the pituitary stalk lesion on the MRI. PMID:24129100

  11. Temozolomide in aggressive pituitary adenomas and carcinomas

    Directory of Open Access Journals (Sweden)

    Leon D. Ortiz

    2012-01-01

    Full Text Available Temozolomide is an alkylating agent used in the treatment of gliomas and, more recently, aggressive pituitary adenomas and carcinomas. Temozolomide methylates DNA and, thereby, has antitumor effects. O6-methylguanine-DNA methyltransferase, a DNA repair enzyme, removes the alkylating adducts that are induced by temozolomide, thereby counteracting its effects. A Medline search for all of the available publications regarding the use of temozolomide for the treatment of pituitary tumors was performed. To date, 46 cases of adenohypophysial tumors that were treated with temozolomide, including 30 adenomas and 16 carcinomas, have been reported. Eighteen of the 30 (60% adenomas and 11 of the 16 (69% carcinomas responded favorably to treatment. One patient with multiple endocrine neoplasia type 1 and an aggressive prolactin-producing adenoma was also treated and demonstrated a good response. No significant complications have been attributed to temozolomide therapy. Thus, temozolomide is an effective treatment for the majority of aggressive adenomas and carcinomas. Evidence indicates that there is an inverse correlation between levels of O6-methylguanine-DNA methyltransferase immunoexpression and therapeutic response. Alternatively, high-level O6-methylguanine-DNA methyltransferase immunoexpression correlates with an unfavorable response. Here, we review the use of temozolomide for treating pituitary neoplasms.

  12. Molecular Imaging of Pituitary Pathology.

    Science.gov (United States)

    de Herder, Wouter W

    2016-01-01

    The presence of large numbers and/or the high affinity of dopamine D2 and/or somatostatin receptors on pituitary adenomas may enable their visualization with radionuclide-coupled receptor agonists or antagonists. However, the role of these imaging modalities in the differential diagnosis of or therapeutic purposes for pituitary lesions is very limited. Only in very specific cases might these molecular imaging techniques become helpful. These include the differential diagnosis of pituitary lesions, ectopic production of pituitary hormones, such as adrenocorticotrophic hormone, growth hormone (GH) or their releasing hormones (corticotropin-releasing hormone and GH-releasing hormone), and the localization of metastases from pituitary carcinomas.

  13. Pituitary adenoma: a radiotherapeutic perspective.

    Science.gov (United States)

    Platta, Christopher S; Mackay, Christopher; Welsh, James S

    2010-08-01

    Pituitary adenomas comprise approximately 10% to 20% of all central nervous system neoplasms whereas autopsy series have suggested that the incidence of pituitary adenoma in the general population may approach 25%. Several treatment modalities are used in the treatment of pituitary adenomas, including observation, surgery, medical intervention, and radiotherapy. The treatment modality employed depends greatly on the type of pituitary adenoma and presenting symptoms. This review will discuss the biology of pituitary adenomas and the current management principles for the treatment of prolactinomas, Cushing disease, acromegaly, and nonsecretory adenomas, with an emphasis on the published radiotherapeutic literature.

  14. Do low-shrink composites reduce polymerization shrinkage effects?

    Science.gov (United States)

    Tantbirojn, D; Pfeifer, C S; Braga, R R; Versluis, A

    2011-05-01

    Progress in polymer science has led to continuous reduction of polymerization shrinkage, exemplified by a new generation of "low-shrink composites". The common inference that shrinkage stress effects will be reduced in teeth restored with such restoratives with lower shrinkage was tested in extracted human premolars. Mesio-occluso-distal slot-shaped cavities were cut and restored with a conventional (SupremePlus) or low-shrink (RefleXions, Premise, Kalore, and LS) composite (N = 5). We digitized the coronal surfaces before and 10 min after restoration to determine cuspal deflection from the buccal and lingual volume change/area. We also determined the main properties involved (total shrinkage, post-gel shrinkage, degree of conversion, and elastic modulus), as well as microleakage, to verify adequate bonding. It was shown that, due to shrinkage stresses, buccal and lingual surfaces pulled inward after restoration (9-14 microns). Only Kalore and LS resulted in significantly lower tooth deformation (ANOVA/Student-Newman-Keuls post hoc, p = 0.05). The other two low-shrink composites, despite having the lowest and highest total shrinkage values, did not cause significant differences in cuspal deflection. Deflection seemed most related to the combination of post-gel shrinkage and elastic modulus. Therefore, even for significantly lower total shrinkage values, shrinkage stress is not necessarily reduced.

  15. Gigantism caused by growth hormone secreting pituitary adenoma.

    Science.gov (United States)

    Rhee, Noorisaem; Jeong, Kumi; Yang, Eun Mi; Kim, Chan Jong

    2014-06-01

    Gigantism indicates excessive secretion of growth hormones (GH) during childhood when open epiphyseal growth plates allow for excessive linear growth. Case one involved a 14.7-year-old boy presented with extreme tall stature. His random serum GH level was 38.4 ng/mL, and failure of GH suppression was noted during an oral glucose tolerance test (OGTT; nadir serum GH, 22.7 ng/mL). Magnetic resonance imaging (MRI) of the brain revealed a 12-mm-sized pituitary adenoma. Transsphenoidal surgery was performed and a pituitary adenoma displaying positive immunohistochemical staining for GH was reported. Pituitary MRI scan was performed 4 months after surgery and showed recurrence/residual tumor. Medical treatment with a long-acting somatostatin analogue for six months was unsuccessful. As a result, secondary surgery was performed. Three months after reoperation, the GH level was 0.2 ng/mL and insulin-like growth factor 1 was 205 ng/mL. Case two involved a 14.9-year-old boy, who was referred to our department for his tall stature. His basal GH level was 9.3 ng/mL, and failure of GH suppression was reported during OGTT (nadir GH, 9.0 ng/mL). Pituitary MRI showed a 6-mm-sized pituitary adenoma. Surgery was done and histopathological examination demonstrated a pituitary adenoma with positive staining for GH. Three months after surgery, the GH level was 0.2 ng/mL and nadir GH during OGTT was less than 0.1 ng/mL. Pituitary MRI scans showed no residual tumor. We present two cases of gigantism caused by a GH-secreting pituitary adenoma with clinical and microscopic findings.

  16. Expression stability of reference genes for quantitative RT-PCR of healthy and diseased pituitary tissue samples varies between humans, mice, and dogs

    NARCIS (Netherlands)

    van Rijn, Sarah J; Riemers, Frank M; van den Heuvel, Douwe; Wolfswinkel, Jeannette; Hofland, Leo; Meij, Björn P; Penning, Louis C

    2014-01-01

    Pituitary surgery generates pituitary tissue for histology, immunohistochemistry, and molecular biological research. In the last decade, the pathogenesis of pituitary adenomas has been extensively studied in humans, and to a lesser degree in dogs, and tumor oncogenesis has been studied in knock-out

  17. Application and advance of temozolomide in the treatment of pituitary adenomas

    Directory of Open Access Journals (Sweden)

    Yi-guang LIN

    2015-12-01

    Full Text Available Pituitary adenoma is a common primary tumor in central nervons system. The aggressive pituitary adenomas show invasive characteristics with higher recurrence rate and worse prognosis, which normally need the comprehensive therapy of surgery, radiotherapy and chemical medications. The therapy of aggressive pituitary adenomas by temozolomide and whether O6-methylguanine-DNA methyltransferase (MGMT could predict the curative effect of temozolomide have become hot spots in recent years. This review intends to illustrate the advance of the therapy of aggressive pituitary adenomas by temozolomide. DOI: 10.3969/j.issn.1672-6731.2015.12.017

  18. Reducing Shrinkage in Canned and Frozen Mushrooms

    OpenAIRE

    Gormley, T. R. (Thomas Ronan); Walshe, P.E.

    1982-01-01

    The process involving a preliminary soaking of the mushrooms in water for 20 min followed by a chill storage period followed by a further water soak for 2 hr, and known as the 3S process, gave a considerable reduction in total shrinkage in both brown and white strain canned mushrooms compared with the control samples. Water uptake by the mushrooms in the 3S process was greatest when the soaking water temperature was between 20 and 30°C and had a pH of 8. Citric acid in the blanch water enhanc...

  19. Mechanical Self-shrinkage of Artillery Barrels

    Directory of Open Access Journals (Sweden)

    Ioan Ciorba

    2012-09-01

    Full Text Available Objective of this paper is to define what self-shrink artillery barrel is. She is considered to be a compound barrel like as a thick-walled tube (k>2, in his wall being introduced a state of stress and strain using specific technological proceeds. This type of treatment is aimed to increase the artillery barrel load capacity and wear resistance in operation. The experimental part was realized using an industrial plant at Mechanical Factory of Resita. This part presents a comparative study between mechanical self-shrinkage on artillery head barrel, first using a mandrel and seconds a ball.

  20. Huadong sintering model about expansion and shrinkage

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    The whole sintering course from the beginning of heating to the end of heat preservation stage was studied by taking into account the influence of pressing. It was found that there exist expanding mechanism and shrinking mechanism in the sintering process, and the expanding mechanism is always acting before the shrinking mechanism. Whether the sintering body shrinks or expands depends on the interaction between the two mechanisms. And according to this, the Huadong sintering model in account of expansion and shrinkage mechanism was given.

  1. Double, synchronous pituitary adenomas causing acromegaly and Cushing's disease. A case report and review of literature.

    Science.gov (United States)

    Zieliński, Grzegorz; Maksymowicz, Maria; Podgórski, Jan; Olszewski, Włodzimierz T

    2013-06-01

    Double pituitary adenomas are very rare and present up to 1 % of pituitary adenomas in unselected autopsy series and up to 2 % in large surgical series. We report a case of a 47-year-old man presented slight clinical features of acromegaly with 2 years duration. Endocrine evaluation confirmed active acromegaly and revealed adrenocorticotropin hormone-dependent hypercortisolemia. Preoperative magnetic resonance imaging of the pituitary demonstrated clearly separated double microadenomas with different intensity. The patient underwent transsphenoidal surgery and both tumors were completely removed and were fixed separately. The histological and ultrastructural examination confirmed coincidence of the double, clearly separated pituitary adenomas in one gland. Postoperative function of the hypothalamo-hypophyseal axis was normalized. We conclude from this case and a literature review that double endocrinologically active pituitary adenomas leading to acromegaly and Cushing's disease may occur. Additionally, a review of the literature regarding multiple pituitary adenomas has also been performed.

  2. Acromegaly with no pituitary adenoma and no evidence of ectopic source

    Directory of Open Access Journals (Sweden)

    Deepak Khandelwal

    2011-01-01

    Full Text Available More than 99% of patients with acromegaly harbor a growth hormone (GH secreting pituitary adenoma. As the time from onset of signs/symptoms to diagnosis of acromegaly is long (symptom onset to diagnosis is often 4-10 years, pituitary adenomas that cause GH excess are often large and are nearly always visible on conventional magnetic resonance imaging (MRI. However, in rare circumstances, acromegalic patients without an ectopic source will not have imaging evidence of a pituitary adenoma. Management of these patients poses special challenge, and once ectopic source of GH/growth-hormone-releasing hormone (GHRH is ruled out, an exploration of pituitary might be useful. We herein report a case of acromegaly with imaging evidence of sellar floor osteoma, but no pituitary adenoma, and negative work up for an ectopic source of GH/GHRH tumor, and on surgical exploration pituitary adenoma could be identified and removed and confirmed on histopathologic examination.

  3. Silorane- and high filled-based"low-shrinkage" resin composites: shrinkage, flexural strength and modulus

    Directory of Open Access Journals (Sweden)

    Cesar Augusto Galvão Arrais

    2013-04-01

    Full Text Available This study compared the volumetric shrinkage (VS, flexural strength (FS and flexural modulus (FM properties of the low-shrinkage resin composite Aelite LS (Bisco to those of Filtek LS (3M ESPE and two regular dimethacrylate-based resin composites, the microfilled Heliomolar (Ivoclar Vivadent and the microhybrid Aelite Universal (Bisco. The composites (n = 5 were placed on the Teflon pedestal of a video-imaging device, and VS was recorded every minute for 5 min after 40 s of light exposure. For the FS and FM tests, resin discs (0.6 mm in thickness and 6.0 mm in diameter were obtained (n = 12 and submitted to a piston-ring biaxial test in a universal testing machine. VS, FS, and FM data were submitted to two-way repeated measures and one-way ANOVA, respectively, followed by Tukey's post-hoc test (a = 5%. Filtek LS showed lower VS than did Aelite LS, which in turn showed lower shrinkage than did the other composites. Aelite Universal and Filtek LS exhibited higher FS than did Heliomolar and Aelite LS, both of which exhibited the highest FM. No significant difference in FM was noted between Filtek LS and Aelite Universal, while Heliomolar exhibited the lowest values. Aelite LS was not as effective as Filtek LS regarding shrinkage, although both low-shrinkage composites showed lower VS than did the other composites. Only Filtek LS exhibited FS and FM comparable to those of the regular microhybrid dimethacrylate-based resin composite.

  4. Non-pituitary origin sellar tumours mimicking pituitary macroadenomas

    Energy Technology Data Exchange (ETDEWEB)

    Abele, T.A., E-mail: travaus@gmail.com [University of Texas Southwestern Medical Center at Dallas, Dallas, TX (United States); Yetkin, Z.F.; Raisanen, J.M.; Mickey, B.E.; Mendelsohn, D.B. [University of Texas Southwestern Medical Center at Dallas, Dallas, TX (United States)

    2012-08-15

    Although the large majority of sellar tumours are pituitary adenomas, several other pituitary and non-pituitary origin tumours arise in the sellar and parasellar regions. Given their location, non-adenomatous lesions frequently mimic pituitary macroadenomas and can pose a diagnostic challenge for the radiologist. Distinguishing rare sellar lesions from the common macroadenoma helps to direct the correct surgical approach and reduce the risk of incomplete resection and/or complications such as cerebrospinal fluid leak with the potential for meningitis. The purpose of this article is to review the imaging features of non-pituitary-origin sellar tumours, focusing on characteristics that may distinguish them from pituitary macroadenomas. Lesions include meningioma, metastatic disease, epidermoid cyst, germinoma, chondrosarcoma, giant cell tumour, and giant aneurysm.

  5. Identification of Differentially Expressed Genes in Pituitary Adenomas by Integrating Analysis of Microarray Data

    Directory of Open Access Journals (Sweden)

    Peng Zhao

    2015-01-01

    Full Text Available Pituitary adenomas, monoclonal in origin, are the most common intracranial neoplasms. Altered gene expression as well as somatic mutations is detected frequently in pituitary adenomas. The purpose of this study was to detect differentially expressed genes (DEGs and biological processes during tumor formation of pituitary adenomas. We performed an integrated analysis of publicly available GEO datasets of pituitary adenomas to identify DEGs between pituitary adenomas and normal control (NC tissues. Gene function analysis including Gene Ontology (GO, Kyoto Encyclopedia of Genes and Genomes (KEGG pathway enrichment analysis, and protein-protein interaction (PPI networks analysis was conducted to interpret the biological role of those DEGs. In this study we detected 3994 DEGs (2043 upregulated and 1951 downregulated in pituitary adenoma through an integrated analysis of 5 different microarray datasets. Gene function analysis revealed that the functions of those DEGs were highly correlated with the development of pituitary adenoma. This integrated analysis of microarray data identified some genes and pathways associated with pituitary adenoma, which may help to understand the pathology underlying pituitary adenoma and contribute to the successful identification of therapeutic targets for pituitary adenoma.

  6. Pituitary tumor-transforming gene 1 and related skin diseases%垂体肿瘤转换基因1与皮肤相关疾病的研究进展

    Institute of Scientific and Technical Information of China (English)

    李蔚然; 范星; 杨森

    2015-01-01

    随着全基因组关联分析等技术的广泛应用,逐渐发现许多复杂性皮肤病的相关易感基因,能更好地解释其发病机制.垂体肿瘤转换基因1是一种常见的原癌基因,在许多肿瘤的发生和发展中起到一定作用.垂体肿瘤转换基因1也称为分离酶蛋白抑制基因,其编码产物为细胞周期调节蛋白,在细胞分裂周期中参与调节姐妹染色单体的分离和细胞周期由中期向后期的过度.同时,垂体肿瘤转换基因1的过度表达也可促进上皮细胞的增生和干扰细胞的分化,进而参与银屑病、皮肤鳞状细胞癌等疾病的发生.另外,该基因也能通过调节干扰素通路而参与系统性红斑狼疮的发病.%With the extensive application of genome-wide association study (GWAS) and other technologies,susceptibility genes of many complex skin diseases have been gradually discovered,which have facilitated the interpretation of pathogenesis of these diseases.Pituitary tumor-transforming gene 1 (PTTG1) is a common protooncogene,and plays an important role in the occurrence and development of many kinds of cancer.PTTG1 is also named securin gene,codes for cyclin,and takes part in the regulation of sister chromatid separation in cell division cycle and transition from metaphase to anaphase in cell cycle.Moreover,the overexpression of PTTG1 can enhance the proliferation of epithelial cells and interfere with cell differentiation,and then result in the occurrence of psoriasis,squamous cell carcinoma and other diseases.Further more,PTTG1 participates in the occurrence of systemic lupus erythematosus through regulation of the interferon signaling pathway.

  7. Dissociated hypopituitarism after spontaneous pituitary apoplexy in acromegaly

    Directory of Open Access Journals (Sweden)

    Shahnaz Ahmad Mir

    2013-01-01

    Full Text Available Introduction: Pituitary apoplexy is an uncommon event and usually occurs in non-functioning pituitary tumors. Among the functioning tumors, prolactinomas are the ones most likely to apoplexy. Apoplexy in growth hormone (GH producing adenomas is a very rare event with less than thirty cases reported worldwide. Objective: To describe a case of spontaneous pituitary apoplexy in acromegaly. Case Report: A 55 year old smoker male presented to the our outpatient clinic in 2004 with complaints of gradual onset increase in the size of hands and feet, bilateral knee pain, increased sweating and blurring of vision. Investigations uncovered diabetes mellitus by a casual blood glucose of 243 mg/dl and HbA1c of 8.5%. Growth hormone suppression test using 75 gram oral glucose showed a 60 minute growth hormone of 105 ng/ml. Magnetic resonance imaging of the sellar region showed a 12.0 mm × 10.0 mm pituitary adenoma. The patient was planned for transsphenoidal tumor decompression. However, the patient was lost to follow up. Eight-years later, he presented in the emergency department of our institute with sudden onset headache, vomiting and decreased level of consciousness of one day duration. CT scan of the head with focus on the sella was suggestive of apoplexy which was later confirmed by the MRI of the sellar region. Conclusion: Although acromegaly can remit following apoplexy of the responsible pituitary adenoma, long term follow up is needed for early detection of the development of deficiency of pituitary hormones which may occur over years following the event as well as to detect tumor regrowth which again may occur several years later.

  8. Hypopituitarism after gamma knife radiosurgery for pituitary adenoma.

    Science.gov (United States)

    Zibar Tomšić, Karin; Dušek, Tina; Kraljević, Ivana; Heinrich, Zdravko; Solak, Mirsala; Vučinović, Ana; Ozretić, David; Mihailović Marasanov, Sergej; Hršak, Hrvoje; Kaštelan, Darko

    2017-05-24

    The aim of the study was to investigate the incidence of and risk factors for hypopituitarism after gamma knife radiosurgery (GKRS) for pituitary adenoma. We conducted a retrospective analysis of the pituitary function of 90 patients who underwent GKRS for pituitary adenoma at the University Hospital Centre Zagreb between 2003 and 2014. Twenty seven of them met the inclusion criteria and the others were excluded from the study due to pituitary insufficiency which was present before GKRS. Eighteen patients had non-functioning and 9 patients had secretory adenomas. Median patients' age was 56 years (24-82). GKRS was performed using the Leksell gamma knife Model C. The median prescription radiation dose was 20 Gy (15-25) and the median tumor volume size was 3.4 cm(3) (0.06-16.81). New onset hypopituitarism was defined as a new deficit of one of the three hormonal axes (corticotroph, thyreotroph, or gonadotroph) ≥3 months following GKRS. SPSS was used for statistical analysis, with the significance level at P<0.05. During the median follow-up period of 72 months (range 6-144), 30% of patients developed new hypopituitarism after GKRS. This corresponds to incidence of one new case of hypopituitarism per 15 patient-years. Age, gender, tumor function, tumor volume, suprasellar extension, prescription dose of radiation, as well as dose-volume to the pituitary gland, stalk and hypothalamus were not predictive factors for the development of hypopituitarism. In our cohort of patients with pituitary tumors who underwent GKRS, 30% developed new hypopituitarism during the follow-up period.

  9. Prevalence of pituitary incidentaloma in the Iranian cadavers

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    K Aghakhani

    2011-01-01

    Full Text Available Aim: Although one-fourth of the pituitary tumors are inactive and silent, increased total volume of the pituitary gland exerts pressure on sella turcica and corrodes the clinoid processes, resulting in several problems. Therefore, determination of the prevalence of the concealed pituitary tumors is of major concern among clinical practitioners. This study was performed to determine the prevalence of these tumors in cadavers referred to the Iranian Legal Medicine Organization (Kahrizak, Tehran. Materials and Methods: This cross-sectional descriptive study was performed between June 2007 and February 2008. A total of 485 cadavers were selected by simple random sampling method. Pituitary glands were removed and then horizontally cut and four slides were prepared from each of them, stained by hematoxylin and eosin, and evaluated by a light microscope. For statistical analysis, SPSS software (version 16, Mann-Whitney U test, Kolmogorov-Smirnov nonparametric test (K-S test, and Chi-square test were used. Results: Of the 485 investigated cadavers, 365 (75.3% were males with an average age of 42 ± 20.5 years and 120 (24.7% were females with an average age of 44 ± 22 years. A total of 61 (12.6% had concealed pituitary masses. No statistically significant difference was found between the mean age, sex, and body mass index (BMI of the cadavers with and without concealed tumors (P=0.380 P=0.450, and P=0.884, respectively. Conclusions: In the present study, the prevalence of the concealed pituitary adenomas was 12.6%. There was no correlation between age, sex, and BMI and the prevalence of the concealed masses.

  10. 长效奥曲肽治疗垂体促甲状腺激素瘤一例临床探讨%A case of thyrotropin-secreting pituitary adenoma treated with long-acting octreotide formulation

    Institute of Scientific and Technical Information of China (English)

    陈晓平; 王昕; 邢小燕; 卢毅; 李光伟

    2011-01-01

    A 56-year-old man with 1-year history of palpitation, heat intolerance and sweating, was diagnosed as thyrotropin (TSH) -secreting pituitary adenoma based on the symptoms of hypermetabolism, enlarged thyroid gland, inappropriately increased serum TSH concomitantly elevated plasma thyroid hormones and a pituitary tumor demonstrated on magnetic resonance imaging. Long-acting octreotide formulation was administered at a dose of 20 mg intramuscularly. Tumor volume shrinkage and improvement of thyroid function was achieved after a single drug injection; and the thyroid function returned to normal in 28 days. It is suggested that long-acting octreotide formulation might be used as a routine therapeutic approach prior to pituitary surgery, which may enhance the effectiveness of surgery and postoperative recovery.%一例56岁男性垂体促甲状腺激素(TSH)瘤患者,病史一年,有心悸、怕热、多汗等高代谢症候群;甲状腺肿大;在血甲状腺激素水平明显增加的同时,TSH水平升高;核磁扫描示垂体肿瘤.经长效奥曲肽20mg注射一次治疗后,肿瘤体积缩小,甲状腺功能明显好转,治疗后第28天转为正常.长效奥曲肽可为TSH瘤患者手术前的常规用药,有利于手术顺利进行及术后康复.

  11. Familial pituitary adenomas.

    Science.gov (United States)

    Vandeva, S; Vasilev, V; Vroonen, L; Naves, L; Jaffrain-Rea, M-L; Daly, A F; Zacharieva, S; Beckers, A

    2010-12-01

    Pituitary adenomas are benign intracranial neoplasms that present a major clinical concern because of hormonal overproduction or compression symptoms of adjacent structures. Most arise in a sporadic setting with a small percentage developing as a part of familial syndromes such as multiple endocrine neoplasia type 1 (MEN1), Carney complex (CNC), and the recently described familial isolated pituitary adenomas (FIPA) and MEN-4. While the genetic alterations responsible for the formation of sporadic adenomas remain largely unknown, considerable advances have been made in defining culprit genes in these familial syndromes. Mutations in MEN1 and PRKAR1A genes are found in the majority of MEN1 and CNC patients, respectively. About 15% of FIPA kindreds present with mutations of the aryl hydrocarbon receptor-interacting protein (AIP) gene. Mutations in the CDKN1B gene, encoding p27(Kip)¹ were identified in MEN4 cases. Familial tumours appear to differ from their sporadic counterparts not only in genetic basis but also in clinical characteristics. Evidence suggests that, especially in MEN1 and FIPA, they are more aggressive and affect patients at younger age, therefore justifying the importance of early diagnosis. In this review, we summarize the genetic and clinical characteristics of these familial pituitary adenomas.

  12. Simple numerical chromosome aberrations in two pituitary adenomas

    DEFF Research Database (Denmark)

    Dietrich, C U; Pandis, N; Bjerre, P

    1993-01-01

    Cytogenetic analysis of short-term cultures of one non-secreting and one prolactin-producing pituitary adenoma revealed simple clonal numerical abnormalities in both tumors. The karyotype of the non-secreting adenoma was 48,XX, +4, +9[42]/49,XX, +4, +9, +20[2]/46,XX[6]. In the prolactin-secreting...

  13. Towards a first classification of aerosol shrinkage events

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    E. Alonso-Blanco

    2015-09-01

    Full Text Available This work presents for the first time a classification of shrinkage events based on the aerosol processes that precede them. To this end, 3.5 years of continuous measurements (from 2009 to 2012 of aerosol size distributions, obtained with a Scanning Mobility Particle Sizer (SMPS at an urban background site in Southern Europe, have been interpreted. 48 shrinkage events were identified and analysed, all occurring during spring and summer when the atmospheric conditions are more favourable for their development. In this study the shrinkage events took place mostly towards the end of the day, and their occurrence could be associated to atmospheric dilution conditions and a reduction in photochemical activity. The shrinkage rate (SR varied between −1.0 and −11.1 nm h−1 (average value of −4.7 ± 2.6 nm h−1. Changes in particle concentrations corresponding to the nucleation and Aitken modes were detected, whereby an increase in the number of particles in the nucleation mode often coincided with a reduction in the Aitken mode. The accumulation mode did not undergo significant changes during these processes. In addition, in some cases, a dilution of the total particle number concentration in the ambient air was observed. Following the proposed methodology, three groups of events have been identified: Group I (NPF + shrinkage, Group II (aerosol growth process + shrinkage and Group III (pure shrinkage events. The largest number of shrinkage events has been observed in the absence of prior processes, i.e. pure shrinkage events, followed by Group I events and finally Group II events. Although this analysis has confirmed that the triggering of shrinkage events is clearly linked to the atmospheric situation and the characteristics of the measurement area, this classification may contribute to a better understanding of the processes involved and the features that characterize shrinkage events.

  14. Progress in the diagnosis and classification of pituitary adenomas

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    Luis V Syro

    2015-06-01

    Full Text Available Pituitary adenomas are common neoplasms. Their classification is based upon size, invasion of adjacent structures, sporadic or familial cases, biochemical activity, clinical manifestations, morphological characteristics, response to treatment and recurrence. Although they are considered benign tumors, some of them are difficult to treat due to their tendency to recur, despite standardized treatment. Functional tumors present other challenges for normalizing their biochemical activity. Novel approaches for early diagnosis as well as different perspectives on classification may help to identify subgroups of patients with similar characteristics, creating opportunities to match each patient with the best personalized treatment option. In this paper we present the progress in the diagnosis and classification of different subgroups of patients with pituitary tumors that may be managed with specific considerations according to their tumor subtype.

  15. Primary hypothyroidism masquerading pituitary macroadenoma

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    Agrawal Amit

    2014-03-01

    Full Text Available Diffuse and reactive pituitary gland enlargement secondary to primary hypothyroidism is an uncommon occurrence and that can masquerade many pituitary disorders. In present article, we report a case of 19 year female severe hypothyroidism presenting with diffuse enlargement of pituitary gland and hyperprolactinemia and review the clinical importance of this entity. Knowledge of this entity is very important to avoid unnecessary surgery and irreversible complications in this sub-group of patients.

  16. Pituitary Metastasis from Renal Cell Carcinoma: Description of a Case Report

    Science.gov (United States)

    Wendel, Chloé; Campitiello, Marco; Plastino, Francesca; Eid, Nada; Hennequin, Laurent; Quétin, Philippe; Longo, Raffaele

    2017-01-01

    Patient: Male, 61 Final Diagnosis: Pituitary metastasis from renal cell carcinoma Symptoms: Deterioration of visual acuity and field • persisting headache • excess thirst • polyuria Medication: — Clinical Procedure: Total body CT-scan • brain MRI • trans-sphenoidal endoscopical surgery • radiotherapy • anti-angiogenic therapy Specialty: Oncology Objective: Rare disease Background: Pituitary metastasis is uncommon, breast and lung cancers being the most frequent primary tumors. Renal cell carcinoma (RCC) is a rare cause of pituitary metastases, with only a few cases described to date. Case Report: We report a case of a 61-year-old man who presented with a progressive deterioration of visual acuity and field associated with a bitemporal hemianopsia. Two years ago, he underwent radical right nephrectomy for a clear cell RCC (ccRCC). The biological tests showed pan-hypopituitarism and diabetes insipidus. Brain MRI revealed a large sellar tumor lesion bilaterally infiltrating the cavernous sinuses, which was surgically resected. Histology confirmed a ccRCC pituitary metastasis. The patient received post-surgical radiotherapy. Considering the presence of concomitant extra-pituitary metastases, treatment with sunitinib was started, followed by several lines of therapy with axitinib, everolimus, and sorafenib because of tumor progression. The patient also presented with a pituitary tumor recurrence, which was treated by stereotaxic radiotherapy. He died five years after the initial diagnosis of RCC and 30 months after the diagnosis of the pituitary metastasis. Conclusions: There are no standardized treatment guidelines for management of pituitary metastases. Pituitary surgery plays a role in symptom palliation, and it does not have any relevant impact on survival. Exclusive radiotherapy or stereotaxic radiotherapy could be an alternative to surgery in patients whose general condition is poor or who have concomitant extra-pituitary metastases. PMID:28044054

  17. Expression pattern of the Hedgehog signaling pathway in pituitary adenomas.

    Science.gov (United States)

    Yavropoulou, Maria P; Maladaki, Anna; Topouridou, Konstantina; Kotoula, Vasiliki; Poulios, Chris; Daskalaki, Emily; Foroglou, Nikolaos; Karkavelas, George; Yovos, John G

    2016-01-12

    Several studies have demonstrated the role of Wnt and Notch signaling in the pathogenesis of pituitary adenomas, but data are scarce regarding the role of Hedgehog signaling. In this study we investigated the differential expression of gene targets of the Hedgehog signaling pathway. Formalin-fixed, paraffin-embedded specimens from adult patients who underwent transphenoidal resection and normal human pituitary tissues that were obtained from autopsies were used. Clinical information and data from pre-operative MRI scan (extracellular tumor extension, tumor size, displacement of the optic chiasm) were retrieved from the Hospital's database. We used a customized RT(2) Profiler PCR Array, to investigate the expression of genes related to Notch and Hedgehog signaling pathways (PTCH1, PTCH2, GLI1, GLI3, NOTCH3, JAG1, HES1, and HIP). A total of 52 pituitary adenomas (32 non-functioning adenomas, 15 somatotropinomas and 5 prolactinomas) were used in the final analysis. In non-functioning pituitary adenomas there was a significant decrease (approximately 75%) in expression of all Hedgehog related genes that were tested, while Notch3 and Jagged-1 expression was found significantly increased, compared with normal pituitary tissue controls. In contrast, somatotropinomas demonstrated a significant increase in expression of all Hedgehog related genes and a decrease in the expression of Notch3 and Jagged-1. There was no significant difference in the expression of Hedgehog and Notch related genes between prolactinomas and healthy pituitary tissues. Hedgehog signalling appears to be activated in somatotropinomas but not in non-functioning pituitary adenomas in contrast to the expression pattern of Notch signalling pathway.

  18. MR findings in pituitary haemosiderosis

    Energy Technology Data Exchange (ETDEWEB)

    Ambrosetto, P. [Institute of Neurology, University of Bologna, Bologna (Italy); Zucchini, S.; Cicognani, A. [First Paediatric Clinic, University of Bologna, Bologna (Italy); Cacciari, E. [First Paediatric Clinic, University of Bologna, Bologna (Italy)]|[Clinica Pediatrica 1, Bologna (Italy)

    1998-05-01

    A girl with Diamond-Blackfan syndrome and hypopituitarism was suspected of having pituitary haemosiderosis because of the clinical picture and the long history of blood transfusions. On T1-weighted MR images the pituitary exhibited a markedly hypointense anterior lobe (mimicking the empty sella), suggesting iron deposition, while on T2W MRI the low signal of the pituitary was surrounded by the high signal of the CSF. MR may be considered the examination of choice for detecting iron overload in the pituitary. (orig.) With 2 figs., 6 refs.

  19. Enhanced nestin expression and small blood vessels in human pituitary adenomas.

    Science.gov (United States)

    Perez-Millan, María Inés; Berner, Silvia Inés; Luque, Guillermina María; De Bonis, Cristian; Sevlever, Gustavo; Becu-Villalobos, Damasia; Cristina, Carolina

    2013-09-01

    The role of angiogenesis in human pituitary tumor progression is questioned. Our aim was to characterize the morphologic changes that occur in the vasculature of pituitary adenomas, in correlation with the expression of nestin, a protein found in endothelial cells of newly formed vessels of developing organs. We also evaluated the relation of angiogenic markers and nestin with Ki-67 index. Immunohistochemical studies were performed on paraffin embedded samples of 47 pituitary adenomas and six normal pituitaries. We determined microvessel density (number of CD31+ or CD34+ vessels per square millimetre), vascular area (cumulative area occupied by vessels), average vessel size, and further classified vessels as small ( 100 μm2). We correlated the above parameters with nestin expression and Ki-67 index. Lower vascular area compared to normal tissue was found in adenomas (p vessels than control pituitaries (p controls, so that nestin positive area was significantly higher in tumors. Furthermore, nestin area correlated positively with the % of small vessels. Ki-67 correlated neither with vascular area nor with nestin expression. In human pituitary tumors there was a predominance of small capillaries in correlation with increased expression of the progenitor marker nestin. We suggest that angiogenesis is an active process in these tumors, in spite of their low total vascular area when compared to normal pituitaries.

  20. Advances in trans-sphenoidal pituitary surgery.

    Science.gov (United States)

    Solari, D; Cavallo, L M; De Angelis, M; Villa, A; Somma, T; Esposito, F; Del Basso De Caro, M; Cappabianca, P

    2012-12-01

    Pituitary surgery is a continuous evolving speciality of the neurosurgeons' armamentarium, requiring precise anatomical knowledge, technical skills and integrated appreciation of the pituitary pathophysiology. Actually, it could be considered the result of a close cooperation between different specialists, i.e. the ophthalmologist, the neuroradiologist, the endocrinologist, the neurosurgeon, the pathologist, etc. In this teamwork environment each member plays his own role, offering his contribute to the final result; every effort is performed to provide patients with the best possible procedure, individually measured. The endoscopic pituitary surgery performed by means of a transsphenoidal approach perfectly fits this scenario, being though advocated as the result of an evolutionary process rather than a revolutionary one. The "pure" endoscopic transsphenoidal surgery - consisting of a whole procedure performed with the endoscope alone and without the use of any transsphenoidal retractor - offers some advantages due to the endoscope itself: a superior close-up view of the relevant anatomy, very important at the tumor/gland interface and an enlarged working angle are provided with an increased panoramic vision inside the surgical area. Results in terms of mass removal, relief of clinical symptoms, cure of the underlying disease and complication rate are similar to those reported in the major microsurgical series but patient compliance is by far better.

  1. Hydration of Portoguese cements, measurement and modelling of chemical shrinkage

    DEFF Research Database (Denmark)

    Maia, Lino; Geiker, Mette Rica; Figueiras, Joaquim A.

    2008-01-01

    Development of cement hydration was studied by measuring the chemical shrinkage of pastes. Five types of Portuguese Portland cement were used in cement pastes with . Chemical shrinkage was measured by gravimetry and dilatometry. In gravimeters results were recorded automatically during at least...

  2. Plastic shrinkage of mortars with shrinkage reducing admixture and lightweight aggregates studied by neutron tomography

    Energy Technology Data Exchange (ETDEWEB)

    Wyrzykowski, Mateusz, E-mail: mateusz.wyrzykowski@empa.ch [Empa, Swiss Federal Laboratories for Materials Science and Technology, Concrete and Construction Chemistry Laboratory, Dübendorf (Switzerland); Lodz University of Technology, Department of Building Physics and Building Materials, Lodz (Poland); Trtik, Pavel [Paul Scherrer Institute, Laboratory for Neutron Scattering and Imaging, Villigen (Switzerland); Empa, Swiss Federal Laboratories for Materials Science and Technology, Concrete and Construction Chemistry Laboratory, Dübendorf (Switzerland); Münch, Beat [Empa, Swiss Federal Laboratories for Materials Science and Technology, Concrete and Construction Chemistry Laboratory, Dübendorf (Switzerland); Weiss, Jason [Purdue University, School of Civil Engineering, West Lafayette (United States); Vontobel, Peter [Paul Scherrer Institute, Laboratory for Neutron Scattering and Imaging, Villigen (Switzerland); Lura, Pietro [Empa, Swiss Federal Laboratories for Materials Science and Technology, Concrete and Construction Chemistry Laboratory, Dübendorf (Switzerland); ETH Zurich, Institute for Building Materials (IfB), Zurich (Switzerland)

    2015-07-15

    Water transport in fresh, highly permeable concrete and rapid water evaporation from the concrete surface during the first few hours after placement are the key parameters influencing plastic shrinkage cracking. In this work, neutron tomography was used to determine both the water loss from the concrete surface due to evaporation and the redistribution of fluid that occurs in fresh mortars exposed to external drying. In addition to the reference mortar with a water to cement ratio (w/c) of 0.30, a mortar with the addition of pre-wetted lightweight aggregates (LWA) and a mortar with a shrinkage reducing admixture (SRA) were tested. The addition of SRA reduced the evaporation rate from the mortar at the initial stages of drying and reduced the total water loss. The pre-wetted LWA released a large part of the absorbed water as a consequence of capillary pressure developing in the fresh mortar due to evaporation.

  3. Simulation of shrinkage cavity formation during solidification of binary alloy

    Directory of Open Access Journals (Sweden)

    T. Skrzypczak

    2010-01-01

    Full Text Available Presented paper is focused on numerical modeling of binary alloy solidification process with connection to shrinkage cavity formation phenomenon. Appropriate matching of cooling parameters during solidification process of the cast with raiser is essential to obtain suitable properties of the manufactured part. Localization, structure and depth of the shrinkage cavity is connected to these parameters. The raiser is removed after process, so defect localization in the top part of the manufactured element is of great importance. Mathematical model of solidification process is presented in the paper. The main focus is put on the algorithm of shrinkage cavity creation process. On the basis of mathematical model the numerical approach using finite element method is proposed. On the base of mathematical and numerical model computer program is made. It is able to perform simulation of the shrinkage cavity formation in 2D region. Shape and localization of shrinkage cavity obtained from simulation is compared to defect which was created during experiment.

  4. The pathophysiology of pituitary adenomas.

    Science.gov (United States)

    Dworakowska, Dorota; Grossman, Ashley B

    2009-10-01

    The pathogenesis of tumour formation in the anterior pituitary has been intensively studied, but the causative mechanisms involved in pituitary cell transformation and tumourigenesis remain elusive. Most pituitary tumours are sporadic, but some arise as a component of genetic syndromes such as the McCune-Albright syndrome, multiple endocrine neoplasia type 1, Carney complex and, the most recently described, a MEN1-like phenotype (MEN4) and pituitary adenoma predisposition syndromes. Some specific genes have been identified that predispose to pituitary neoplasia (GNAS, MEN1, PRKAR1A, CDKN1B and AIP), but these are rarely involved in the pathogenesis of sporadic tumours. Mutations of tumour suppressor genes or oncogenes, as seen in more common cancers, do not seem to play an important role in the great majority of pituitary adenomas. The pituitary tumour transforming gene (PTTG; securin) was the first transforming gene found to be highly expressed in pituitary tumour cells, and seems to play an important role in the process of oncogenesis. Many tumour suppressor genes, especially those involved in the regulation of the cell cycle, are under-expressed, most often by epigenetic modulation - usually promoter hypermethylation - but the regulator of these co-ordinated series of methylations is also unclear. Cell signalling abnormalities have been identified in pituitary tumours, but their genetic basis is unknown. Both Raf/MEK/ERK and PI3K/Akt/mTOR pathways are over-expressed and/or over-activated in pituitary tumours: these pathways share a common root, including initial activation related to the tyrosine kinase receptor, and we speculate that a change to these receptors or their relationship to membrane matrix-related proteins may be an early event in pituitary tumourigenesis.

  5. Pituitary carcinoma diagnosed on fine needle aspiration: Report of a case and review of pathogenesis

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    Yakoushina Tatiana

    2010-01-01

    Full Text Available Pituitary carcinoma (PC is a very rare entity (0.2% of all pituitary tumors, with only about 140 cases reported in English literature. There are no reliable histological, immunohistochemical or ultrastructural features distinguishing pituitary adenoma (PA from PC. By definition, a diagnosis of PC is made after a patient with PA develops non-contiguous central nervous system (CNS or systemic metastases. To date, only three cases of PC have been reportedly diagnosed on fine needle aspiration (FNA. Two of the reported cases were diagnosed on FNA of the cervical lymph nodes and one on FNA of the vertebral bone lesion. Herein, we present a case of PC, diagnosed on FNA of the liver lesion. In this case, we describe cytologic features of PC and compare them to histologic features of the tumor in the pituitary. Clinical behavior of tumor, pathogenesis of metastasis and immunochemical and prognostic markers will also be described.

  6. Pituitary adenoma and vestibular schwannoma: Case report and review of the literature

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    Niu Y

    2010-01-01

    Full Text Available The concurrence of the intracranial multiple primary tumors (MPTs consisting of acoustic neuroma (AN and pituitary adenoma is very rare. Here, we report a 42-year-old female who presented with left AN associated with pituitary adenoma. A total of three such cases have been reported before and which also presented with left AN with pituitary adenoma. Recently, a new "field cancerization" model has been proposed, which could explain MPTs and is consistent with the pathogenesis of such cases. The model also indicates that when a pituitary tumor or AN is detected separately, we might consider the development of "expanding field" after oncological treatment especially after radiotherapy in order to prevent the second field tumor occurring.

  7. Prothymosin-alpha and Ki-67 expression in pituitary adenomas

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    Iga Wierzbicka-Tutka

    2016-11-01

    Full Text Available Introduction: Prothymosin alpha (PTMA, a nuclear oncoprotein involved in cell cycle regulation, is used as a prognostic marker in many cancers. The histopathology of pituitary carcinomas and locally invasive adenomas is indistinguishable from that of benign tumors. A new marker is needed to differentiate these lesions. We evaluated PTMA in pituitary adenomas to determine its usefulness as a prognostic factor of tumor proliferation.Material/Methods: We conducted a retrospective analysis of a group of 27 patients, including 15 females (56% and 12 males (44% with a mean age of 58.6±12 years, who underwent pituitary tumor surgery between 2003 and 2012. The Ki-67 and PTMA-nuclear (PTMA-n and PTMA-cytoplasmic (PTMA-c indices were determined by immunohistochemical staining. We studied histopathological features, clinical symptoms, and magnetic resonance imaging or computed tomography performed before surgery and one year following surgery to evaluate tumor size and progression.Results: The expression of Ki-67 was revealed in 77.8% of adenomas, PTMA-n in 81.5% and PTMA-c in 92.6%. The mean value of the Ki-67 index was 1.8%, PTMA-n was 1.84%, and PTMA-c was 35.6%. There was a significant positive correlation between Ki-67 and PTMA-n (p=0.009. We did not find any correlation between Ki-67, PTMA-c, and tumor progression. PTMA-n was found to be correlated with tumor size (p=0.045 and was higher in the case of gonadotropinomas (p=0.026.Conclusions: The positive nuclear expression of Ki-67 and PTMA was observed in the majority of pituitary adenomas. Neither the expression of Ki-67 nor that of PTMA-c was related to tumor recurrence or local invasion.

  8. Metastatic pituitary carcinoma: a case report and review of literature

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    ZHANG Shang-fu

    2013-02-01

    Full Text Available Background As a kind of rare tumor, metastatic pituitary carcinoma is very difficult to diagnose clinically and is easy to be misdiagnosed. This article aims to discuss the clinical manifestations and histopathological features of this tumor. Methods The clinical presentations, histopathological features and immunophenotype were studied in one case of poorly differentiated lung adenocarcinoma metastatic to pituitary gland, and related literature was reviewed. Results A 47-year-old woman mainly presented with faint, headache and blurred vision. CT scan demonstrated abnormal signals in suprasellar cistern. During the resection, the tumor could be seen locating in sellar region, the size of which was about 2 cm × 1 cm × 1 cm. Histopathological examination revealed that the structure of pituitary gland was damaged and the tumor was composed of atypical round or oval cells arranged in nest or glandular patterns, in which a number of enlarged plump tumor cells contained abundant eosinophilic cytoplasm with eccentrical caryogenesis. The immunohistochemistry showed that epithelial membrane antigen (EMA, pan cytokeratin (PCK, thyroid transcription factor-1 (TTF-1 and cytokeratin 7 (CK7 were positive in tumor cells with Ki-67 labeling index being 15%, but chromogranin (CgA, cancer embryo antigen (CEA, human chorionic gonadotropin (hCG, placental alkaline phosphatase (PLAP, CD117, leukocyte common antigen (LCA, CD30, anaplastic lymphoma kinase-1 (ALK-1 were negative in tumor cells. After operation the patient received treatment with levothyroxine sodium and γ knife, but died 4 months later. Conclusion Histopathological examination and immunohistochemistry can confirm the diagnosis of metastatic pituitary carcinoma and locate the primary lesion. Postoperative comprehensive therapy is necessary.

  9. An unusual case of hypopituitarism and transient thyrotoxicosis following asymptomatic pituitary apoplexy.

    Science.gov (United States)

    Yoshida, Masanori; Murakami, Miho; Ueda, Harumi; Miyata, Misaki; Takahashi, Norio; Oiso, Yutaka

    2014-01-01

    Although pituitary function is often impaired in pituitary apoplexy, the development of thyrotoxicosis is rare. We describe an unusual case of hypopituitarism due to pituitary apoplexy coexisting with transient hyperthyroidism. A 74-year-old woman presented with severe fatigue, palpitation, appetite loss, hypotension, and hyponatremia. Endocrine studies showed hyperthyroidism and anterior pituitary hormone deficiencies. A magnetic resonance imaging suggested recent-onset pituitary apoplexy in a pituitary tumor, although the patient had no apoplectic symptoms such as headache and visual disturbance. Thyrotoxicosis and adrenal insufficiency worsened her general condition. Glucocorticoid supplementation improved her clinical symptoms and hyponatremia. Serum anti-thyrotropin receptor and thyroid-stimulating antibody titers were negative, and her thyroid function was spontaneously normalized without antithyroid medication, suggesting painless thyroiditis. Thereafter, her thyroid function decreased because of central hypothyroidism and 75 µg of levothyroxine was needed to maintain thyroid function at the euthyroid stage. The pituitary mass was surgically removed and an old hematoma was detected in the specimen. Considering that painless thyroiditis develops as a result of an autoimmune process, an immune rebound mechanism due to adrenal insufficiency probably caused painless thyroiditis. Although the most common type of thyroid disorder in pituitary apoplexy is central hypothyroidism, thyrotoxicosis caused by painless thyroiditis should be considered even if the patient has pituitary deficiencies. Because thyrotoxicosis with adrenal insufficiency poses a high risk for a life-threatening adrenal crisis, prompt diagnosis and treatment are critical.

  10. Regulation of pituitary hormones and cell proliferation by components of the extracellular matrix

    Directory of Open Access Journals (Sweden)

    M. Paez-Pereda

    2005-10-01

    Full Text Available The extracellular matrix is a three-dimensional network of proteins, glycosaminoglycans and other macromolecules. It has a structural support function as well as a role in cell adhesion, migration, proliferation, differentiation, and survival. The extracellular matrix conveys signals through membrane receptors called integrins and plays an important role in pituitary physiology and tumorigenesis. There is a differential expression of extracellular matrix components and integrins during the pituitary development in the embryo and during tumorigenesis in the adult. Different extracellular matrix components regulate adrenocorticotropin at the level of the proopiomelanocortin gene transcription. The extracellular matrix also controls the proliferation of adrenocorticotropin-secreting tumor cells. On the other hand, laminin regulates the production of prolactin. Laminin has a dynamic pattern of expression during prolactinoma development with lower levels in the early pituitary hyperplasia and a strong reduction in fully grown prolactinomas. Therefore, the expression of extracellular matrix components plays a role in pituitary tumorigenesis. On the other hand, the remodeling of the extracellular matrix affects pituitary cell proliferation. Matrix metalloproteinase activity is very high in all types of human pituitary adenomas. Matrix metalloproteinase secreted by pituitary cells can release growth factors from the extracellular matrix that, in turn, control pituitary cell proliferation and hormone secretion. In summary, the differential expression of extracellular matrix components, integrins and matrix metalloproteinase contributes to the control of pituitary hormone production and cell proliferation during tumorigenesis.

  11. A Case of Nonfunctioning Pituitary Carcinoma That Responded to Temozolomide Treatment

    Directory of Open Access Journals (Sweden)

    Haruko Morokuma

    2012-01-01

    Full Text Available Pituitary carcinoma is a rare malignancy and is difficult to manage. Pituitary carcinomas commonly produce either PRL or ACTH, but some do not produce pituitary hormones. The alkylating reagent temozolomide (TMZ was recently shown to be effective as a treatment for pituitary carcinoma. Most of the published reports of TMZ use in pituitary carcinoma cases were against hormone-producing carcinomas. Only a few patients with a nonfunctioning pituitary carcinoma treated with TMZ have been reported. Here we describe our treatment of a patient with nonfunctioning pituitary carcinoma and a background of multiple endocrine neoplasia type 1. The pituitary carcinoma was accompanied by meningeal dissemination with cerebral and L1 spinal bone metastasis. The patient received continuous dosing of TMZ along with external radiation, followed by standard dosing of TMZ. There was an apparent antitumor response seen in MRI. MGMT, an enzyme antagonized by TMZ, was negative in the tumor. The therapeutic efficacy of TMZ and dosing schedules of TMZ in pituitary carcinoma are discussed.

  12. Effective Expansion: Balance between Shrinkage and Hygroscopic Expansion.

    Science.gov (United States)

    Suiter, E A; Watson, L E; Tantbirojn, D; Lou, J S B; Versluis, A

    2016-05-01

    The purpose of this study was to investigate the relationship between hygroscopic expansion and polymerization shrinkage for compensation of polymerization shrinkage stresses in a restored tooth. One resin-modified glass-ionomer (RMGI) (Ketac Nano, 3M ESPE), 2 compomers (Dyract, Dentsply; Compoglass, Ivoclar), and a universal resin-based composite (Esthet•X HD, Dentsply) were tested. Volumetric change after polymerization ("total shrinkage") and during 4 wk of water storage at 37°C was measured using an optical method (n= 10). Post-gel shrinkage was measured during polymerization using a strain gauge method (n= 10). Extracted human molars with large mesio-occluso-distal slot preparations were restored with the tested restorative materials. Tooth surfaces at baseline (preparation), after restoration, and during 4 wk of 37°C water storage were scanned with an optical scanner to determine cuspal flexure (n= 8). Occlusal interface integrity was measured using dye penetration. Data were analyzed using analysis of variance and post hoc tests (significance level 0.05). All tested materials shrunk after polymerization. RMGI had the highest total shrinkage (4.65%) but lowest post-gel shrinkage (0.35%). Shrinkage values dropped significantly during storage in water but had not completely compensated polymerization shrinkage after 4 wk. All restored teeth initially exhibited inward (negative) cuspal flexure due to polymerization shrinkage. Cuspal flexure with the RMGI restoration was significantly less (-6.4 µm) than with the other materials (-12.1 to -14.1 µm). After 1 d, cuspal flexure reversed to +5.0 µm cuspal expansion with the RMGI and increased to +9.3 µm at 4 wk. After 4 wk, hygroscopic expansion compensated cuspal flexure in a compomer (Compoglass) and reduced flexure with Dyract and resin-based composite. Marginal integrity (93.7% intact restoration wall) was best for the Compoglass restorations and lowest (73.1%) for the RMGI restorations. Hygroscopic

  13. Application of milk duct scope in bilateral nipple discharge patients with hypothyroidism or pituitary tumor%乳管内窥镜在合并甲状腺功能低下或垂体瘤的双侧乳头溢液中的应用

    Institute of Scientific and Technical Information of China (English)

    栾梅香; 樊珈榕; 温浩; 杨纾旖; 付艳; 木拉提; 刘丽

    2009-01-01

    Objective To investigate whether the bilateral nipple discharge with the background of hypothyroidism and pituitary tumor causes intraductal neoplasm. Methods Clinical data of 222 bilateral nipple discharge patients with hypothyroidism or pituitary tumor undergoing mammary ductoseopy (MDS) examination were analyzed. Those diagnosed as intraductal papilloma received surgery and pathological exam. 158 cases with inflammatory comedomastitis diagnosed by MDS received milk duct washing with gentamycin, dexamethasone and corresponding medical treatment. Results Among the 222 cases, 158 cases(71.17%) were diagnosed as inflammatory comedomastitis by MDS, 64 cases (28.83%) were diagnosed as intraduetal papilloma (64/222) by MDS and received operation,59 cases were pathologically diagnosed as intraductal papilloma,the other 5 cases were pathologically diagnosed as mammary duct ectasia. The pathological coincidence was 92.2% and no breast cancer was observed. 68.10% of inflammatory comedomastitis cases suffered from breast pain. There were no significant difference in the disease distribution of the ethnic groups. During pre-menopause period, the incidence of period neoplasia is higher in pituitary tumor than hypothyroidism; However, during the post-menopause the situation was vice versa. The color of niplle discharge is mostly milk-like in patients with pituitary tumor, while serous in patients with hypothyroidism. 71.19% of duct papilloma locate at the branch of the main duct. Conclusion The bilateral nipple discharge with hypothyroidism or pituitary are usually concomitant with intraduetal lesions. Mammary ductosopy is helpful to discover intraduetal neoplasia.%目的 探讨合并甲状腺功能低下或垂体瘤的双侧乳头溢液与乳腺导管内病变的关系.方法 对222例临床确诊的甲状腺功能低下(94例)和垂体瘤(128例)患者行乳管镜检查.结果 222例患者中有64例乳管镜诊断为乳腺导管内乳头状瘤,158

  14. The Spectrum of Hormone Immunoreactivity in Typical and Atypical Pituitary Adenomas

    Directory of Open Access Journals (Sweden)

    Yeşim ERTAN

    2009-09-01

    Full Text Available Objective: We aimed to assess the spectrum of hormone immunoreactivity in our pituitary adenoma cases and discuss the diagnostic parameters of atypical pituitary adenomas.Material and Methods: A total of 166 pituitary adenoma cases diagnosed from 2005 to 2008 in our department were included in the present study. Hematoxylin-eosin stained and immunohistochemistry performed slides (ACTH, PRL, GH, TSH, FSH, LH, Ki-67, and p53 were evaluated. Cases having more than two mitoses on 10 high power fields besides more than 3% Ki-67 index were accepted in the atypical group.Results: Histologically, 159 cases were typical pituitary adenoma and 7 were atypical pituitary adenoma. Of the atypical pituitary adenoma cases, one case was ACTH, one GH and one both GH and prolactin hormone immunoreactive pituitary adenomas. Four cases were hormone immunonegative adenomas. Of the typical pituitary adenoma cases, 39 cases were GH, 19 ACTH, 17 prolactin, 10 FSH, 8 LH and one TSH immunreactive pituitary adenomas. Fourty-seven cases were hormone immunonegative adenomas.Twenty-two of the all pitutary adenoma cases had recurrence. Of these cases, 18 were typical adenoma and four were atypical adenoma.Conclusion: The ratio of prolactin immunoreactive pituitary adenoma cases in the surgical material of neuropathology is decreasing due to medical therapy. Atypical pituitary adenomas are not the sole factor affecting the recurrence mechanism but these tumors have higher recurrence rate compared with typical pituitary adenomas and we think the proliferation index might be the principal approach in the diagnosis of these lesions.

  15. Anisotropic shrinkage characteristics of tape cast alumina

    Science.gov (United States)

    Patwardhan, Jaideep Suresh

    Dimensional control during sintering is a major issue in ceramics processing to avoid high post-sintering costs associated with machining of the fired ceramic part to desired tolerances and dimensions. Ceramic forming processes such as tape casting, injection molding, and extrusion involve shear of anisotropic particles resulting in preferential alignment of the particles in the green body. This preferential alignment causes directionality in mechanical, electrical, optical, and magnetic properties and most importantly warpage or distortion during sintering. A large effort has been devoted to synthesizing ceramic green bodies with minimal density gradients and uniform packing and modeling the sintering behavior evolution but little effort has been devoted to characterizing orientation of particles and the effect of preferential alignment on sintering shrinkage anisotropy. A systematic study was initiated to study the effect of processing variables such as shear rate, solids loading, temperature, and binder content on aqueous tape cast alumina. Three different alumina systems: A16-SG, Baikowski RC-UFX DBM and RC-LS DBM were investigated. Aqueous tapes of high solids loading alumina (56 vol. %) were tape cast at various speeds and thicknesses and assuming plane Couette flow a shear rate regime of 21--270 s-1 was investigated. Higher shear rates and high solids loading resulted in higher in-plane anisotropy whereas the anisotropy in the thickness direction was higher for low solids loading systems. The anisotropy was found to be fairly constant above a certain critical shear rate (˜100 s-1) irrespective of the temperature and the solids loading and this correlated with the viscosity-shear rate relationship of the cast slips. The higher shrinkage anisotropy in the thickness direction for the low solids loading systems (35 and 45 vol. %) was attributed to the higher amount of organics in the slip required to sustain the suitable viscosity for tape casting and

  16. Temozolomide therapy in patients with aggressive pituitary adenomas or carcinomas.

    Science.gov (United States)

    Losa, Marco; Bogazzi, Fausto; Cannavo, Salvo; Ceccato, Filippo; Curtò, Lorenzo; De Marinis, Laura; Iacovazzo, Donato; Lombardi, Giuseppe; Mantovani, Giovanna; Mazza, Elena; Minniti, Giuseppe; Nizzoli, Maurizio; Reni, Michele; Scaroni, Carla

    2016-02-01

    Temozolomide is effective in some patients with progressive pituitary adenoma or carcinoma. We report a survey study of Italian patients treated with Temozolomide because of aggressive pituitary adenoma or carcinoma resistant to standard therapies. Italian endocrinologists were surveyed and asked to participate into the study. A questionnaire was sent to all those who agreed and had used Temozolomide in at least one patient with pituitary tumor. Database was closed in December 2013. A literature review was also performed. Thirty-one patients were included into the analysis. Mean age at start of Temozolomide treatment was 58.3 ± 1.9 years (± standard error). Six of the 31 (19.4%) Italian patients had a pituitary carcinoma. Twenty-five patients (80.6%) had disease control during Temozolomide treatment, while 6 patients (19.4%) had disease progression. Median follow-up after beginning Temozolomide was 43 months. Thirteen patients had tumor growth after stopping Temozolomide. The 2-year progression-free survival was 47.7% (95% CI 29.5-65.9%), while the 2-year disease control duration was 59.1% (95% CI 39.1-79.1%). Eleven patients died of progressive disease and other two patients of unrelated causes. The 2-year and 4-year overall survival rates were 83.9% (95% CI 70.7-97.1%) and 59.6% (95% CI 40.0-79.2%), respectively. Temozolomide is an additional effective therapeutic option for the treatment of aggressive pituitary tumors. The drug is well tolerated and causes few severe adverse effects. Recurrence of the tumor can occur after an initial positive response and usually portends a grim outcome.

  17. Cure shrinkage in epoxy grouts for grouted repairs

    Science.gov (United States)

    Shamsuddoha, Md.; Islam, Md. Mainul; Aravinthan, Thiru; Manalo, Allan; Lau, Kin-tak

    2013-08-01

    Structures can go through harsh environmental adversity and can experience material loss and cracks during their service lives. Infill material is used to ensure a supporting bed for a grouted repair. Epoxy grouts are used for repairing and rehabilitating structures, such as foundations, bridges, piers, transportation pipelines, etc., because they are resistant to typical chemicals and possess superior mechanical properties than other grouts. The resin based infill used inside the void or cracked space of the repair is vulnerable to shrinkage. When these filled grouts have high resin content, cracks can develop from residual stresses, which can affect the load transfer performance. It follows that interlayer separation and cracking of infill layer can occur in a grouted repair. In this study, volumetric shrinkage of two epoxy grouts was measured over 28 days using a Pycnometer. The highest volumetric shrinkage measured after 7 days was found to be 2.72%. The results suggest that the volumetric shrinkage can be reduced to 1.1% after 7 days, through the introduction of a coarse aggregate filler; a 2.5 times reduction in shrinkage. About 98% and 92% of the total shrinkage over the 28 day period, of the unfilled and filled grouts respectively, was found to occur within 7 days of mixing. The gel-time shrinkages were also calculated, to determine the "postgel" part of the curing contraction which subsequently produces residual stresses in the hardened grout systems.

  18. Unusual mixed gangliocytoma-pituitary adenoma in sellar region

    Directory of Open Access Journals (Sweden)

    Jie-tian JIN

    2016-10-01

    Full Text Available Background The presence of ganglion cells within an endocrine pituitary adenoma in sellar region is rare, and is usually diagnosed as "mixed gangliocytoma-pituitary adenoma". Due to lack of radiological characteristics, it is very difficult to make an accurate diagnosis preoperatively. Herein we describe one case of unusual mixed gangliocytoma - growth hormone (GH secreting pituitary adenoma in sellar region and review related literatures, so as to summarize the clinicopathological characteristics and improve the diagnosis and differential diagnosis of this tumor. Methods and Results A 28 - year - old female presented with headache and blurred vision for 8 months. She also complained of acromegaly and amenorrhea. Head CT and MRI examinations showed a sellar and suprasellar mass with clear boundary compressing the optic chiasm and buttom of the third ventricle. The mass exhibited isointense signal or mild hypointensity on T1WI and mild hyperintensity on T2WI with heterogeneous enhancement on the contrast MRI. The tumor was removed totally. The histological sections demonstrated two parts of intermixed areas. One part of areas was marked by a proliferation of scattered gangliocyte - like cells arranged in a fibrillary background. Other areas were marked by a sheet - like or locally papillary proliferation of round and oval cells. Immunohistochemically, cytoplasm of gangliocyte-cells were diffusely positive for synaptophysin (Syn, and negative for adenohypophysial hormones; cytoplasm of round and oval cells were diffusely positive for Syn, and almost 30% cells were positive for GH, and negative for other neurohypophysial hormones. A final diagnosis of mixed gangliocytoma-GH secreting pituitary adenoma in sellar region (WHO grade Ⅰ was made. The patient did not receive postoperatively adjuvant therapy and was followed-up for one year, without any neurological deficit or signs of recurrence. Conclusions Mixed gangliocytoma - pituitary

  19. MR imaging of growth hormone-secreting pituitary adenomas

    Energy Technology Data Exchange (ETDEWEB)

    Suzuki, Masayuki; Ueda, Fumiaki; Fujinaga, Yasunari [Kanazawa Univ. (Japan). School of Medicine] (and others)

    2000-11-01

    We evaluated MR imaging of 51 growth hormonesecreting pituitary adenomas. On T1WI, 22 tumors were isointense with gray matter (GM), nine isointense with GM and white matter (WM), 14 isointense with WM, and six more hyperintense than WM. On T2WI of 45 patients, only fifteen tumors showed hypointensity than WM, 10 were isointense with WM, eight isointense with GM and WM, 12 showed in part isointensity with GM, and one was more hyperintense than GM. The dynamic study demonstrated the tumor more clearly than the delayed study in 10, while the opposite was true for two patients. The dynamic study is inevitable for MR imaging of GH-secreting pituitary adenomas. (author)

  20. Transsphenoidal pituitary resection with intraoperative MR guidance: preliminary results

    Science.gov (United States)

    Pergolizzi, Richard S., Jr.; Schwartz, Richard B.; Hsu, Liangge; Wong, Terence Z.; Black, Peter M.; Martin, Claudia; Jolesz, Ferenc A.

    1999-05-01

    The use of intraoperative MR image guidance has the potential to improve the precision, extent and safety of transsphenoidal pituitary resections. At Brigham and Women's Hospital, an open-bore configuration 0.5T MR system (SIGNA SP, GE Medical Systems, Milwaukee, WI) has been used to provide image guidance for nine transsphenoidal pituitary adenoma resections. The intraoperative MR system allowed the radiologist to direct the surgeon toward the sella turcica successfully while avoiding the cavernous sinus, optic chiasm and other sensitive structures. Imaging performed during the surgery monitored the extent of resection and allowed for removal of tumor beyond the surgeon's view in five cases. Dynamic MR imaging was used to distinguish residual tumor from normal gland and postoperative changes permitting more precise tumor localization. A heme-sensitive long TE gradient echo sequence was used to evaluate for the presence of hemorrhagic debris. All patients tolerated the procedure well without significant complications.

  1. Gangliocytoma combined with a pituitary adenoma:Reports of three cases and literature review

    Institute of Scientific and Technical Information of China (English)

    Zhenmin Wang; Peng Li; Qiangyi Zhou; Zhijun Yang; Pinan Liu

    2016-01-01

    Objectives:Sellar gangliocytomas are extremely rare. Since they present clinically and radiologically as pituitary adenomas, the preoperative diagnosis of these mixed tumors is very difficult. Here, we report three cases of gangliocytoma combined with pituitary adenoma and describe our findings. Methods: The clinical data of the three cases of gangliocytoma combined with pituitary adenoma have been retrospectively analyzed, and the published literature has also been reviewed. Results:All three patients underwent pure endonasal endoscopic surgery, and no recurrence was observed over a follow-up of at least 30 months. Growth hormone (GH)-hypersecreting adenoma and tumor calcification were detected in these mixed tumors. Conclusions: Pure endoscopic transnasal transsphenoidal surgery may be an effective way for the treatment of this kind of tumor. Gross total resection of the tumor is recommended. In addition, calcification with GH-hypersecretion may serve as a preoperative diagnostic clue for gangliocytoma in the sella turcica.

  2. Anaplastic astrocytoma 14 years after radiotherapy for pituitary adenoma

    Energy Technology Data Exchange (ETDEWEB)

    Tamura, Masaru; Misumi, Syuuzou; Kurosaki, Syuuhei; Shibasaki, Takashi; Ohye, Chihiro (Gunma Univ., Maebashi (Japan). School of Medicine)

    1992-04-01

    A case of anaplastic astrocytoma following radiotherapy for growth hormone secreting pituitary adenoma is presented with a review of the literature. A 43 year old female was admitted with signs of acromegaly and hypertension. An eosinophilic pituitary adenoma was subtotally removed by transsphenoidal approach, followed by 60 Gy irradiation using a 2x2 cm lateral field. Fourteen years later at the age of 57, she suffered from headache, recent-memory disturbance and uncinate fits. CT scan and MRI disclosed ring-like enhanced mass lesion in the left temporal lobe, corresponding to the previous irradiated field. {sup 18}F-FDG PET showed hypermetabolism at the lesion. Left frontotemporal craniotomy was performed, and a reddish gray gelatinous tumor containing necrotic center and cyst was partially removed. Histologically, the tumor consisted of hypercellular astrocytic cells with perivascular pseudorosette. Coagulation necrosis at the center of the tumor, and hyalinosis and fibrosis of the blood vessels in and around the tumor, which might have been caused by the antecedent radiotherapy, were recognized. Postoperative radiotherapy and chemotherapy, were given, however, she expired 13 months after the operation. Seven cases, including ours, of malignant glioma following radiotherapy for pituitary adenoma were reported in the literature. A total dose of irradiation varies from 45 to 95 Gy with a mean of 50 Gy. The period of latency before tumor occurrence ranges from 5 to 22 years with a mean of 10 years. The differentiation of radiation-induced gliomas from radionecrosis of the brain is also discussed. (author).

  3. Alternative methods for determining shrinkage in restorative resin composites.

    Science.gov (United States)

    de Melo Monteiro, Gabriela Queiroz; Montes, Marcos Antonio Japiassú Resende; Rolim, Tiago Vieira; de Oliveira Mota, Cláudia Cristina Brainer; de Barros Correia Kyotoku, Bernardo; Gomes, Anderson Stevens Leônidas; de Freitas, Anderson Zanardi

    2011-08-01

    The purpose of this study was to evaluate polymerization shrinkage of resin composites using a coordinate measuring machine, optical coherence tomography and a more widely known method, such as Archimedes Principle. Two null hypothesis were tested: (1) there are no differences between the materials tested; (2) there are no differences between the methods used for polymerization shrinkage measurements. Polymerization shrinkage of seven resin-based dental composites (Filtek Z250™, Filtek Z350™, Filtek P90™/3M ESPE, Esthet-X™, TPH Spectrum™/Dentsply 4 Seasons™, Tetric Ceram™/Ivoclar-Vivadent) was measured. For coordinate measuring machine measurements, composites were applied to a cylindrical Teflon mold (7 mm × 2 mm), polymerized and removed from the mold. The difference between the volume of the mold and the volume of the specimen was calculated as a percentage. Optical coherence tomography was also used for linear shrinkage evaluations. The thickness of the specimens was measured before and after photoactivation. Polymerization shrinkage was also measured using Archimedes Principle of buoyancy (n=5). Statistical analysis of the data was performed with ANOVA and the Games-Howell test. The results show that polymerization shrinkage values vary with the method used. Despite numerical differences the ranking of the resins was very similar with Filtek P90 presenting the lowest shrinkage values. Because of the variations in the results, reported values could only be used to compare materials within the same method. However, it is possible rank composites for polymerization shrinkage and to relate these data from different test methods. Independently of the method used, reduced polymerization shrinkage was found for silorane resin-based composite. Copyright © 2011 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.

  4. Comparative Analysis of Measured and Predicted Shrinkage Strain in Concrete

    Directory of Open Access Journals (Sweden)

    Kossakowski P. G.

    2014-06-01

    Full Text Available The article discusses the issues related to concrete shrinkage. The basic information on the phenomenon is presented as well as the factors that determine the contraction are pointed out and the stages of the process are described. The guidance for estimating the shrinkage strain is given according to Eurocode standard PN-EN 1992-1-1:2008. The results of studies of the samples shrinkage strain of concrete C25/30 are presented with a comparative analysis of the results estimated by the guidelines of the standard according to PN-EN 1992-1- 1:2008

  5. Shrinkage covariance matrix approach for microarray data

    Science.gov (United States)

    Karjanto, Suryaefiza; Aripin, Rasimah

    2013-04-01

    Microarray technology was developed for the purpose of monitoring the expression levels of thousands of genes. A microarray data set typically consists of tens of thousands of genes (variables) from just dozens of samples due to various constraints including the high cost of producing microarray chips. As a result, the widely used standard covariance estimator is not appropriate for this purpose. One such technique is the Hotelling's T2 statistic which is a multivariate test statistic for comparing means between two groups. It requires that the number of observations (n) exceeds the number of genes (p) in the set but in microarray studies it is common that n Hotelling's T2 statistic with the shrinkage approach is proposed to estimate the covariance matrix for testing differential gene expression. The performance of this approach is then compared with other commonly used multivariate tests using a widely analysed diabetes data set as illustrations. The results across the methods are consistent, implying that this approach provides an alternative to existing techniques.

  6. T2-weighted MRI signal predicts hormone and tumor responses to somatostatin analogs in acromegaly.

    Science.gov (United States)

    Potorac, Iulia; Petrossians, Patrick; Daly, Adrian F; Alexopoulou, Orsalia; Borot, Sophie; Sahnoun-Fathallah, Mona; Castinetti, Frederic; Devuyst, France; Jaffrain-Rea, Marie-Lise; Briet, Claire; Luca, Florina; Lapoirie, Marion; Zoicas, Flavius; Simoneau, Isabelle; Diallo, Alpha M; Muhammad, Ammar; Kelestimur, Fahrettin; Nazzari, Elena; Centeno, Rogelio Garcia; Webb, Susan M; Nunes, Marie-Laure; Hana, Vaclav; Pascal-Vigneron, Véronique; Ilovayskaya, Irena; Nasybullina, Farida; Achir, Samia; Ferone, Diego; Neggers, Sebastian J C M M; Delemer, Brigitte; Petit, Jean-Michel; Schöfl, Christof; Raverot, Gerald; Goichot, Bernard; Rodien, Patrice; Corvilain, Bernard; Brue, Thierry; Schillo, Franck; Tshibanda, Luaba; Maiter, Dominique; Bonneville, Jean-François; Beckers, Albert

    2016-11-01

    GH-secreting pituitary adenomas can be hypo-, iso- or hyper-intense on T2-weighted MRI sequences. We conducted the current multicenter study in a large population of patients with acromegaly to analyze the relationship between T2-weighted signal intensity on diagnostic MRI and hormonal and tumoral responses to somatostatin analogs (SSA) as primary monotherapy. Acromegaly patients receiving primary SSA for at least 3 months were included in the study. Hormonal, clinical and general MRI assessments were performed and assessed centrally. We included 120 patients with acromegaly. At diagnosis, 84, 17 and 19 tumors were T2-hypo-, iso- and hyper-intense, respectively. SSA treatment duration, cumulative and mean monthly doses were similar in the three groups. Patients with T2-hypo-intense adenomas had median SSA-induced decreases in GH and IGF-1 of 88% and 59% respectively, which were significantly greater than the decreases observed in the T2-iso- and hyper-intense groups (P < 0.001). Tumor shrinkage on SSA was also significantly greater in the T2-hypo-intense group (38%) compared with the T2-iso- and hyper-intense groups (8% and 3%, respectively; P < 0.0001). The response to SSA correlated with the calculated T2 intensity: the lower the T2-weighted intensity, the greater the decrease in random GH (P < 0.0001, r = 0.22), IGF-1 (P < 0.0001, r = 0.14) and adenoma volume (P < 0.0001, r = 0.33). The T2-weighted signal intensity of GH-secreting adenomas at diagnosis correlates with hormone reduction and tumor shrinkage in response to primary SSA treatment in acromegaly. This study supports its use as a generally available predictive tool at diagnosis that could help to guide subsequent treatment choices in acromegaly. © 2016 Society for Endocrinology.

  7. RT-01FRACTIONATED STEREOTACTIC RADIOTHERAPY FOR PITUITARY ADENOMA WITH NOVALIS

    Science.gov (United States)

    Arakawa, Yoshiki; Mizowaki, Takashi; Ogura, Kengo; Sakanaka, Katsuyuki; Hojo, Masato; Hiraoka, Masahiro; Miyamoto, Susumu; Murata, Daiki

    2014-01-01

    BACKGROUND: Radiation therapy is an available treatment modality for pituitary adenoma. In particular, it is effective for the case unable to be removed with surgery or repeating recurrence. However, hypopituitarism and optic nerve injury associated with radiation therapy become a problem. Novalis® (Brain Lab) is an equipment of radiation to establish the detailed irradiation area, fractionated stereotactic radiotherapy (fSRT) and intensity-modulated radiation therapy (IMRT). Retrospectively, we review local control and morbidity following fSRT with Novalis in pituitary adenoma. PATIENTS AND METHODS: Between 2007 and 2012, 29 patients with pituitary adenoma (9 functioning, 20 non-functioning) received fSRT with Novalis in our institute. Total radiation dose was 50.4-54Gy (1.8 Gy per fraction) and prescribed to the gross target volume + 2 mm. The effectiveness of fSRT was evaluated by tumor volume and clinical symptoms on pre- fSRT, and every 1-year. RESULTS: The median follow-up time was 59.1 months (20 to 83 months). Tumor regrowth was observed in 2 cases. Progression free survival rate was 93%. New visual field deficit was observed in 1 case, and new pituitary dysfunction were not observed in all patients. CONCLUSION: fSRT with Novalis is safe and effective in the treatment for pituitary adenoma. Although follow-up time is short, any problematic complications were not observed. In the future, fSRT is expected to make for safe and effective treatment in pituitary adenoma impossible to cure surgically.

  8. Xanthomatous Hypophysitis Mimicking a Pituitary Adenoma: Case Report and Review of the Literature

    Directory of Open Access Journals (Sweden)

    Laura Aste

    2010-01-01

    Full Text Available Background. Hypophysitis is an inflammatory disease of the pituitary gland that may mimic pituitary tumors clinically and radiologically. Case Description. We report a case of a xanthomatous hypophysitis initially diagnosed as pituitary adenoma. A 31-year-old woman presented with headache, diabetes insipidus, and amenorrhea. A head CT scan showed no intrasellar changes, while an MRI scan showed a sellar cystic mass. An endocrinological work up revealed mild hypocortisolism and diabetes insipidus (DI. Transsphenoidal surgery was performed. The intraoperative histological examination suggested a pituitary adenoma. The removed tissue showed central necrosis surrounded by accumulation of foamy cells and xanthomatous epithelioid cells. The patient made an uneventful postoperative recovery, Nevertheless, DI persisted and the adenohypophysis hypofunction did not recover. Conclusion. We describe an unusual inflammatory lesion of the pituitary gland mimicking an adenoma. A high level of clinical suspicion of inflammatory disorders is necessary for correct diagnosis and optimal management.

  9. ACTH-producing carcinoma of the pituitary with refractory Cushing's Disease and hepatic metastases: a case report and review of the literature

    Directory of Open Access Journals (Sweden)

    Sippel Rebecca

    2009-04-01

    Full Text Available Abstract Background Pituitary carcinomas are rare neuroendocrine tumors affecting the adenohypophysis. The hallmark of these lesions is the demonstration of distant metastatic spread. To date, few well-documented cases have been reported in the literature. Case presentation Here, we report the case of a fatal pituitary carcinoma evolving within two years from an adrenocorticotrophic hormone (ACTH-secreting macroadenoma and review the global literature regarding this rare neuroendocrine tumor. Conclusion Pituitary carcinomas are extremely rare neoplasms, representing only 0.1% to 0.2% of all pituitary tumors. To date, little is understood about the molecular basis of malignant transformation. The latency period between initial presentation of a pituitary adenoma and the development of distal metastases marking carcinoma is extremely variable, and some patients may live well over 10 years with pituitary carcinoma.

  10. BIM-23A760 influences key functional endpoints in pituitary adenomas and normal pituitaries: molecular mechanisms underlying the differential response in adenomas.

    Science.gov (United States)

    Ibáñez-Costa, Alejandro; López-Sánchez, Laura M; Gahete, Manuel D; Rivero-Cortés, Esther; Vázquez-Borrego, Mari C; Gálvez, María A; de la Riva, Andrés; Venegas-Moreno, Eva; Jiménez-Reina, Luis; Moreno-Carazo, Alberto; Tinahones, Francisco J; Maraver-Selfa, Silvia; Japón, Miguel A; García-Arnés, Juan A; Soto-Moreno, Alfonso; Webb, Susan M; Kineman, Rhonda D; Culler, Michael D; Castaño, Justo P; Luque, Raúl M

    2017-02-09

    Chimeric somatostatin/dopamine compounds such as BIM-23A760, an sst2/sst5/D2 receptors-agonist, have emerged as promising new approaches to treat pituitary adenomas. However, information on direct in vitro effects of BIM-23A760 in normal and tumoral pituitaries remains incomplete. The objective of this study was to analyze BIM-23A760 effects on functional parameters (Ca(2+) signaling, hormone expression/secretion, cell viability and apoptosis) in pituitary adenomas (n = 74), and to compare with the responses of normal primate and human pituitaries (n = 3-5). Primate and human normal pituitaries exhibited similar sst2/sst5/D2 expression patterns, wherein BIM-23A760 inhibited the expression/secretion of several pituitary hormones (specially GH/PRL), which was accompanied by increased sst2/sst5/D2 expression in primates and decreased Ca(2+) concentration in human cells. In tumoral pituitaries, BIM-23A760 also inhibited Ca(2+) concentration, hormone secretion/expression and proliferation. However, BIM-23A760 elicited stimulatory effects in a subset of GHomas, ACTHomas and NFPAs in terms of Ca(2+) signaling and/or hormone secretion, which was associated with the relative somatostatin/dopamine-receptors levels, especially sst5 and sst5TMD4. The chimeric sst2/sst5/D2 compound BIM-23A760 affects multiple, clinically relevant parameters on pituitary adenomas and may represent a valuable therapeutic tool. The relative ssts/D2 expression profile, particularly sst5 and/or sst5TMD4 levels, might represent useful molecular markers to predict the ultimate response of pituitary adenomas to BIM-23A760.

  11. BIM-23A760 influences key functional endpoints in pituitary adenomas and normal pituitaries: molecular mechanisms underlying the differential response in adenomas

    Science.gov (United States)

    Ibáñez-Costa, Alejandro; López-Sánchez, Laura M.; Gahete, Manuel D.; Rivero-Cortés, Esther; Vázquez-Borrego, Mari C.; Gálvez, María A.; de la Riva, Andrés; Venegas-Moreno, Eva; Jiménez-Reina, Luis; Moreno-Carazo, Alberto; Tinahones, Francisco J.; Maraver-Selfa, Silvia; Japón, Miguel A.; García-Arnés, Juan A.; Soto-Moreno, Alfonso; Webb, Susan M.; Kineman, Rhonda D.; Culler, Michael D.; Castaño, Justo P.; Luque, Raúl M.

    2017-01-01

    Chimeric somatostatin/dopamine compounds such as BIM-23A760, an sst2/sst5/D2 receptors-agonist, have emerged as promising new approaches to treat pituitary adenomas. However, information on direct in vitro effects of BIM-23A760 in normal and tumoral pituitaries remains incomplete. The objective of this study was to analyze BIM-23A760 effects on functional parameters (Ca2+ signaling, hormone expression/secretion, cell viability and apoptosis) in pituitary adenomas (n = 74), and to compare with the responses of normal primate and human pituitaries (n = 3–5). Primate and human normal pituitaries exhibited similar sst2/sst5/D2 expression patterns, wherein BIM-23A760 inhibited the expression/secretion of several pituitary hormones (specially GH/PRL), which was accompanied by increased sst2/sst5/D2 expression in primates and decreased Ca2+ concentration in human cells. In tumoral pituitaries, BIM-23A760 also inhibited Ca2+ concentration, hormone secretion/expression and proliferation. However, BIM-23A760 elicited stimulatory effects in a subset of GHomas, ACTHomas and NFPAs in terms of Ca2+ signaling and/or hormone secretion, which was associated with the relative somatostatin/dopamine-receptors levels, especially sst5 and sst5TMD4. The chimeric sst2/sst5/D2 compound BIM-23A760 affects multiple, clinically relevant parameters on pituitary adenomas and may represent a valuable therapeutic tool. The relative ssts/D2 expression profile, particularly sst5 and/or sst5TMD4 levels, might represent useful molecular markers to predict the ultimate response of pituitary adenomas to BIM-23A760. PMID:28181484

  12. Dural enhancement in pituitary macroadenomas

    Energy Technology Data Exchange (ETDEWEB)

    Cattin, F. [Dept. of Neuroradiology, University Hospital of Besancon (France); Dept. of Neuroradiology, Jean Minjoz Hospital, Besancon (France); Bonneville, F.; Andrea, I.; Barrali, E.; Bonneville, J.F. [Dept. of Neuroradiology, University Hospital of Besancon (France)

    2000-07-01

    We describe the normal dural enhancement patterns of the sellar region and determine whether the duramater is affected by pituitary macroadenomas. Dural enhancement appeared to be usually abnormal in 20 patients with pituitary macroadenoma compared with 20 control patients, mainly at the planum sphenoidale and carotid sulcus. However dural changes are subtle and their recognition requires knowledge of the normal enhancement patterns. Dural changes, reported in a variety of inflammatory and infectious dural diseases and after surgery, are not specific and may be also seen in pituitary macroadenomas. (orig.)

  13. Creep and Shrinkage of High Strength Concretes: an Experimental Analysis

    Directory of Open Access Journals (Sweden)

    Berenice Martins Toralles carbonari

    2002-01-01

    Full Text Available The creep and shrinkage behaviour of high strength silica fume concretes is significantly different from that of conventional concretes. In order to represent the proper time-dependent response of the material in structural analysis and design, these aspects should be adequately quantified. This paper discusses an experimental setup that is able to determine the creep and shrinkage of concrete from the time of placing. It also compares different gages that can be used for measuring the strains. The method is applied to five different concretes in the laboratory under controlled environmental conditions. The phenomena that are quantified can be classified as basic shrinkage, drying shrinkage, basic creep and drying creep. The relative importance of these mechanisms in high strength concrete will also be presented.

  14. Nanocavity Shrinkage and Preferential Amorphization during Irradiation in Silicon

    Institute of Scientific and Technical Information of China (English)

    ZHU Xian-Fang; WANG Zhan-Guo

    2005-01-01

    @@ We model the recent experimental results and demonstrate that the internal shrinkage of nanocavities in silicon is intrinsically associated with preferential amorphization as induced by self-ion irradiation.

  15. Development of spraying agent for reducing drying shrinkage of mortar

    Science.gov (United States)

    Fujiwara, Hiromi; Maruoka, Masanori; Liu, Lingling

    2017-02-01

    Mortar used to repair is sometimes exposed to drying state in early ages after construction and a few days later water is sprayed frequently on the surface of the mortar in order to prevent cracks. This research studied on shrinkage characteristic of mortar subjected to drying conditions like this. The result showed that the water spraying on the mortar after initial drying did not have any effect to prevent shrinkage, but increased. And it also showed when various chemical agents are mixed and used in watersprayingit had the prevention effect on shrinkage. This report was to understand this kind of phenomenon and clarify the mechanism. In addition, based on the results, the new spraying agent was developed to reduce drying shrinkage.

  16. Comparison of shrinkage related properties of various patch repair materials

    Science.gov (United States)

    Kristiawan, S. A.; Fitrianto, R. S.

    2017-02-01

    A patch repair material has been developed in the form of unsaturated polyester resin (UPR)-mortar. The performance and durability of this material are governed by its compatibility with the concrete being repaired. One of the compatibility issue that should be tackled is the dimensional compatibility as a result of differential shrinkage between the repair material and the concrete substrate. This research aims to evaluate such shrinkage related properties of UPR-mortar and to compare with those of other patch repair materials. The investigation includes the following aspects: free shrinkage, resistance to delamination and cracking. The results indicate that UPR-mortar poses a lower free shrinkage, lower risk of both delamination and cracking tendency in comparison to other repair materials.

  17. Influence of gelatinous fibers on the shrinkage of silver maple

    Science.gov (United States)

    Donals G. Arganbright; Dwight W. Bensend; Floyd G. Manwiller

    1970-01-01

    The degree of lean was found to have a significant influence on the logitudinal and transverse shrinkage of three soft maple trees. This may be accounted for by differences in the cell wall layer thickness and fibril angle.

  18. Applying strain into graphene by SU-8 resist shrinkage

    Science.gov (United States)

    Takamura, Makoto; Hibino, Hiroki; Yamamoto, Hideki

    2016-07-01

    We investigated the use of the shrinkage of SU-8 resist caused by thermal annealing to apply strain into graphene grown by the chemical-vapor-deposition (CVD) method. We demonstrate that the shrinkage of resist deposited on top of graphene on a substrate induces a local tensile strain within a distance of 1-2 μm from the edge of the resist. The thermal shrinkage of SU-8 will allow us to design the local strain in graphene on substrates. We also show that the shrinkage induces a large tensile strain in graphene suspended between two bars of SU-8. We expect that a much larger strain can be induced by suppressing defects in CVD-grown graphene.

  19. Accurate characterisation of post moulding shrinkage of polymer parts

    DEFF Research Database (Denmark)

    Neves, L. C.; De Chiffre, L.; González-Madruga, D.;

    2015-01-01

    The work deals with experimental determination of the shrinkage of polymer parts after injection moulding. A fixture for length measurements on 8 parts at the same time was designed and manufactured in Invar, mounted with 8 electronic gauges, and provided with 3 temperature sensors. The fixture...... of post moulding shrinkage of polymer parts was developed. Expanded uncertainties (k=2) of 3 μm were obtained....

  20. Method to determine factors contributing to thermoplastic sheet shrinkage

    Science.gov (United States)

    Rensch, Greg J.; Frye, Brad A.

    A test method is presented for the determination of shrinkage behavior in vacuum-formed thermoplastic resin sheeting, as presently simulated for various resin lots, sheet-gage thicknesses, sheet orientations, and mold profiles. The thermoforming machine and vacuum-forming mold characteristics are discussed. It is established that the four variable factors exert statistically significant effects on the shrinkage response of three Declar resin lots, but that these are of no real practical significance for either engineering or manufacturing operations.

  1. Fast shrinkage of tropical glaciers in Colombia

    Science.gov (United States)

    Ceballos, Jorge Luis; Euscátegui, Christian; Ramírez, Jair; Cañon, Marcela; Huggel, Christian; Haeberli, Wilfried; Machguth, Horst

    As a consequence of ongoing atmospheric temperature rise, tropical glaciers belong to the unique and threatened ecosystems on Earth, as defined by the Intergovernmental Panel on Climate Change (Houghton and others, 2001). Worldwide glacier monitoring, especially as part of the Global Climate Observing System (GCOS), includes the systematic collection of data on such perennial surface ice masses. Several peaks in the sierras of Colombia have lost their glacier cover during recent decades. Today, high-altitude glaciers still exist in Sierra Nevada de Santa Marta, in Sierra Nevada del Cocuy and on the volcanoes of Nevados del Ruiz, de Santa Isabel, del Tolima and del Huila. Comparison of reconstructions of maximum glacier area extent during the Little Ice Age with more recent information from aerial photographs and satellite images clearly documents a fast-shrinking tendency and potential disappearance of the remaining glaciers within the next few decades. In the past 50 years, Colombian glaciers have lost 50% or more of their area. Glacier shrinkage has continued to be strong in the last 15 years, with a loss of 10-50% of the glacier area. The relationship between fast glacier retreat and local, regional and global climate change is now being investigated. Preliminary analyses indicate that the temperature rise of roughly 1° C in the last 30 years recorded at high-altitude meteorological stations exerts a primary control on glacier retreat. The investigations on the Colombian glaciers thus corroborate earlier findings concerning the high sensitivity of glaciers in the wet inner tropics to temperature rise. To improve understanding of fast glacier retreat in Colombia, a modern monitoring network has been established according to the multilevel strategy of the Global Terrestrial Network for Glaciers (GTN-G) within GCOS. The observations are also contributions to continued assessments of hazards from the glacier-covered volcanoes and to integrated global change

  2. Cytomorphology of metastatic pituitary carcinoma to the bone.

    Science.gov (United States)

    Chandler, Christopher M; Lin, Xiaoqi

    2017-03-07

    Metastatic pituitary carcinoma to bone is rare. In this report, we present a case of a 59-year-old female with recurrent pituitary adenoma of the sparsely granulated somatotroph subtype with metastasis to a few bony sites 10 years later. Needle core biopsy (NCB) with touch preparations was performed on a 5 mm lesion in left ilium. Diff-Quik stained NCB touch preparation slides showed a few loosely cohesive epithelial polygonal cells that were arranged in nests or acini, or singly, had scant vacuolated cytoplasm and eccentrically located round nuclei (plasmacytoid) with slight nuclear pleomorphism, fine granular chromatin, conspicuous nucleoli, and smooth nuclear membrane. Trilineage hematopoietic cells of bone marrow were also appreciated in the background. H&E stained core sections showed fragments of bone and bone marrow with nests of bland epithelial cells with similar cytomorphology as seen in NCB touch preparation slides. The tumor cells were immunoreactive for juxtanuclear dot-like staining of pan-cytokeratin (CAM 5.2 and AE1/AE3) (a specific feature), neuroendocrine markers (CD56, synaptophysin, and chromogranin. Additionally, scattered cells were immunoreactive for growth hormone. Molecular test showed that tumor cells were negative for the promoter methylation of O-6-Methylguanine-DNA Methyltransferase (MGMT). Final diagnosis of metastatic pituitary carcinoma was rendered. Morphology of metastatic pituitary carcinoma, its differential, clinical presentation and treatment were discussed. Diagn. Cytopathol. 2017. © 2017 Wiley Periodicals, Inc.

  3. Ectopic Adrenocorticotropic Hormone-Secreting Pituitary Adenomas: An Underestimated Entity.

    Science.gov (United States)

    Knappe, Ulrich J; Jaspers, Christian; Buschsieweke, Desirée; Reinbold, Wolf-Dieter; Alomari, Ali; Saeger, Wolfgang; Ehlenz, Klaus; Mann, W Alexander; Kann, Peter Herbert; Feldkamp, Joachim

    2017-04-01

    The diagnosis of Cushing disease is based on endocrinological pa-rameters, with no single test being specific. In some patients, dynamic thin-slice sellar magnetic resonance imaging fails to detect a pituitary tumor. The purpose of this study is to investigate the role of ectopic pituitary adenoma in this situation. In a retrospective chart review, 5 patients (6%) with ectopic adenomas were identified in 83 consecutive patients undergoing transsphenoidal surgery for adrenocorticotropic hormone (ACTH)-secreting pituitary adenomas by 1 surgeon. In all 5 patients (all female, 32-41 years of age), an exclusively extrasellar ACTH-secreting adenoma was excised. Three adenomas were located in the cavernous sinus, 1 in the sphenoid sinus, and 1 in the ethmoidal cells. Histologically, none of the tumors showed signs of aggressiveness. Three of the 5 adenomas specifically expressed somatostatin receptor 5. In 4 patients with Cushing disease, postoperative remission was obtained, with 1 recurrence after 14 months. In the patient with Nelson syndrome, ACTH decreased from >800 to ectopic adenoma (positive for somatostatin receptor 5) in the ethmoidal cells turned out to be positive on gallium 68 DOTATATE positron emission tomography/computed tomography. The incidence of primarily ectopic ACTH-secreting adenomas in this series was 6%. In cases of negative MRI findings, an ectopic ACTH-secreting adenoma should be taken into account. 68 Ga DOTATATE positron emission tomography/computed tomography may identify ectopic pituitary adenomas. Hypophysectomy should always be avoided in primary surgery for CD.

  4. Chondroid chordoma of the sella turcica mimicking a pituitary adenoma.

    Science.gov (United States)

    Wu, Arthur W; Bhuta, Sunita; Salamon, Noriko; Martin, Neil; Wang, Marilene B

    2015-01-01

    We report an unusual case of a chondroid chordoma of the sella turcica that mimicked the clinical and radiologic presentation of the more common pituitary adenoma. A 50-year-old man presented with bitemporal visual field deficits. Magnetic resonance imaging (MRI) detected a sellar mass that was suggestive of a pituitary adenoma. However, the intraoperative appearance of the mass was not consistent with an adenoma, and frozen-section pathology was obtained. Pathology identified the mass as a malignant lesion. Based on this finding, the mass was treated more aggressively. Chondroid chordomas are rare and slowly growing but locally aggressive tumors. The prognosis depends on the ability to totally resect the mass, so differentiating this tumor from a benign lesion is critical. An intrasellar chordoma can be confused clinically and radiologically with a pituitary adenoma. These two lesions are nearly identical on MRI, although T2-weighted imaging sometimes demonstrates higher intensity with a chondroid chordoma. Computed tomography may be helpful in demonstrating bony destruction by these lesions, as can the presence of intralesional calcifications. Intraoperative findings of bony invasion or a purple-red color may also lead the surgeon to suspect a diagnosis other than pituitary adenoma.

  5. Opposite effects of dihydrotestosterone and estradiol on apoptosis in the anterior pituitary gland from male rats.

    Science.gov (United States)

    Magri, María Laura; Gottardo, María Florencia; Zárate, Sandra; Eijo, Guadalupe; Ferraris, Jimena; Jaita, Gabriela; Ayala, Mariela Moreno; Candolfi, Marianela; Pisera, Daniel; Seilicovich, Adriana

    2016-03-01

    Hormones locally synthesized in the anterior pituitary gland are involved in regulation of pituitary cell renewal. In the pituitary, testosterone (T) may exert its actions per se or by conversion to dihydrotestosterone (DHT) or 17β-estradiol (E2) by 5α-reductase and aromatase activity, which are expressed in this gland. Previous reports from our laboratory showed that estrogens modulate apoptosis of lactotropes and somatotropes from female rats. Now, we examined the in vitro and in vivo effects of gonadal steroids on apoptosis of anterior pituitary cells from adult male rats. T in vitro did not modify apoptosis in anterior pituitary cells from gonadectomized (GNX) male rats. DHT, a non-aromatizable androgen, exerted direct antiapoptotic action on total anterior pituitary cells and folliculo-stellate cells, but not on lactotropes, somatotropes, or gonadotropes. On the contrary, E2 exerted a rapid apoptotic effect on total cells as well as on lactotropes and somatotropes. Incubation of anterior pituitary cells with T in presence of Finasteride, an inhibitor of 5α-reductase, increased the percentage of TUNEL-positive cells. In vivo administration of DHT to GNX rats reduced apoptosis in the anterior pituitary whereas E2 exerted proapoptotic action and reduced cells in G2/M-phase of the cell cycle. In summary, our results indicate that DHT and E2 have opposite effects on apoptosis in the anterior pituitary gland suggesting that local metabolization of T to these steroids could be involved in pituitary cell turnover in males. Changes in expression and/or activity of 5α-reductase and aromatase may play a role in the development of anterior pituitary tumors.

  6. Expression of p53 protein in pituitary adenomas

    Directory of Open Access Journals (Sweden)

    Oliveira M.C.

    2002-01-01

    Full Text Available Inactivating mutations of TP53, a tumor suppressor gene, are associated with abnormal cell proliferation. Although p53 expression is common in many human malignancies, p53 protein has seldom been evaluated in pituitary tumors. When detected, the percentage of p53-positive cells is low, and, in general, it is exclusive for invasive lesions. The aim of the present study was to use immunohistochemistry to determine the presence of p53 protein in pituitary adenomas from tumor samples of 163 surgeries performed in 148 patients (40% male, 60% female. In 35% of the cases the adenoma was nonfunctional, while in the others it was associated with PRL, GH and/or ACTH endocrine hypersecretion syndrome. Macroadenomas were observed in 83.2% of the cases with available neuroimage evaluation, of which 28% invaded the cavernous, sphenoid and/or ethmoidal sinus, bone, third ventricle or subfrontal lobe. p53 protein was detected in 2/148 patients (1.3%. Immunohistochemistry was positive for PRL and GH in these cases. Due to the high percentage of invasive pituitary adenomas found in our study, the low frequency of p53 detection suggests that it is inadequate as a routine marker for aggressiveness and as a predictive factor of tumor behavior.

  7. Outcome of visual acuity after surgical removal of pituitary adenomas

    Directory of Open Access Journals (Sweden)

    Grković Desanka

    2013-01-01

    Full Text Available Introduction. Pituitary adenomas with suprasellar extension may produce anterior visual pathway compression, resulting in characteristic visual deficit. Surgical decompression of these structures prevents further visual deterioration and its postop­ erative recovery. Objective. The aim of this study was to investigate pre­ and postoperative visual acuity (VA in patients with pituitary ad­ enomas, and to detect the influence of prognostic factors, such as symptoms duration, degree of visual acuity reduction and tumor size in the assessment of the prognosis of postoperative visual function. Methods. We analyzed 40 consecutive patients who fulfilled three criteria: evidence of preoperative visual dysfunction, transsphenoidal or transfrontal tumor resection and hystologically verified pituitary adenoma. A visual examination was performed under standard conditions, pre and postoperatively (10 days, one month and six months after surgery. A paired t­test was used to assess the differences of pre­ and postoperative characteristics values, and the Chisquare test of independence in the assessment of the influence of prognostic factors. Results. Postoperative improvement of VA was seen in 84.61% patients (68% eyes. Eyes with preoperative mild and moderate degree of VA reduction showed improvement in 89.65% eyes in contrast to 22.60% eyes with preoperative severe reduction of VA, which was all statistically significant. Eyes in patients with tumor smaller than 20 mm had improvement of VA in 91.66% eyes, while eyes with tumor larger than 40 mm had improvement of VA in 61.11% eyes, which was statistically significant. When symptoms duration was below two years the improvement of VA was detected in 65.38% eyes as related to 50% eyes with symptoms duration exceeding two years, which was not statistically significant. Conclusion. Pituitary adenomas commonly cause visual impairment. Postoperatively the majority of patients show a distinct improvement of

  8. Pituitary macroadenomas: reviews of 60 cases; Revisao de 60 casos de macroadenomas hipofisarios

    Energy Technology Data Exchange (ETDEWEB)

    Santos, Alair Augusto S.M.D. dos; Fontes, Cristina Asvolinsque P.; Magnago, Marcelo [Universidade Federal Fluminense, Niteroi, RJ (Brazil). Inst. de Radiologia; Moreira, Denise Madeira [Universidade Federal, Rio de Janeiro, RJ (Brazil). Inst. de Radiologia; Andreiuolo, Pedro Angelo [Hospital Santa Cruz/Beneficencia Portuguesa, Niteroi, RJ (Brazil). Servico de Radiologia; Oliveira, Fernando Barros de; Teixeira, Ricardo Tostes D.; Correa, Saul Orlando C. [Universidade Federal, Rio de Janeiro, RJ (Brazil). Inst. de Biofisica Carlos Chagas Filho. Curso de Pos-graduacao Medica

    2000-12-01

    We reviewed 60 cases of patients with pituitary macroadenomas who were submitted to magnetic resonance imaging evaluations at private institutions in Niteroi and Rio de Janeiro, Brazil. The aim of this study was to demonstrate the advantages of magnetic resonance imaging in the diagnosis and follow-up of these patients. Macroprolactinomas were the most prevalent tumors. We also observed four growth-hormone (GH) secreting macroadenomas with clinical signs of acromegaly, and one GH- and prolactin-secreting macroadenoma. Seven patients presented pituitary apoplexy and hyperintense signal on T1-W images before contrast medium (gadolinium) administration suggestive of intratumoral bleeding. The follow-up of 15 cases demonstrated a reduction in the size of the tumor after surgery, clinical treatment or radiotherapy. Magnetic resonance imaging is important for the study of pituitary macroadenomas, particularly before surgery, as it shows the involvement of adjacent structures, specially the cavernous sinus, optic chiasm and pituitary stalk compression. (author)

  9. A FSH-Secreting Pituitary Macroadenoma Causing A Testosterone Deficiency Syndrome

    Directory of Open Access Journals (Sweden)

    Xiong Wang

    2014-03-01

    Full Text Available FSH-secreting pituitary adenomas can affect sexual and reproductive function. In this article, we have reported the case of a 32-year-old male with secondary infertility. The patient had sexual and reproductive disturbances. The test results of the blood samples indicated obviously decreased testosterone (T and estradiol (E2 levels. Based on previous hormonal results, the patient received pituitary stimulation and human chorionic gonadotropin (hCG tests. Both follicle stimulating hormone (FSH and luteinizing hormone (LH showed low response during the pituitary stimulation test. The results of the hCG test indicated that T/E2 could recover to a normal level. In addition, this patient was diagnosed with pituitary macroadenoma, which was supported by the pituitary MRI. The man’s sexual and reproductive functions recovered following surgery. The pathological results confirmed that the tumor tissue was an FSH-secreting pituitary adenoma by immunohistochemical staining. The purpose of this report was to review the relative literature and discuss the influence of FSH-secreting pituitary adenomas on hormones through the hypothalamus-pituitary-testis axis.

  10. Disulfiram sensitizes pituitary adenoma cells to temozolomide by regulating O6-methylguanine-DNA methyltransferase expression.

    Science.gov (United States)

    Zhao, Yachao; Xiao, Zheng; Chen, Wenna; Yang, Jinsheng; Li, Tao; Fan, Bo

    2015-08-01

    O6-methylguanine-DNA methyltransferase (MGMT) activity is responsible for temozolomide (TMZ) resistance in patients harboring aggressive pituitary adenomas. Recently, disulfiram (DSF) has been shown to induce the loss of MGMT protein and increase TMZ efficacy in glioblastoma cells, while CD133+ nestin+ cells isolated from the cell population have been implicated as pituitary adenoma stem-like cells. However, whether DSF is able to potentiate the cytotoxic effects of TMZ on human pituitary adenoma cells has not been investigated to date. In the present study, CD133+ nestin+ phenotype cells were isolated from primary cultured human pituitary adenoma cells using microbeads. It was found that DSF reduced MGMT protein expression and sensitized human pituitary adenoma cells and stem-like cells to TMZ in vitro, while the proteasome inhibitor PS-341 abrogated the inhibitory effect of DSF on MGMT in vitro. The sensitizing effect of DSF was also verified in primary cultured human pituitary adenoma cells in vivo. The results of the present study suggested that DSF can increase the efficacy of the anti-tumor effect of TMZ on human pituitary adenoma cells and CD133+ nestin+ stem like cells via the ubiquitin-proteasomal MGMT protein elimination route. DSF combined with TMZ may be an effective therapeutic strategy against aggressive pituitary adenomas.

  11. In1-ghrelin splicing variant is overexpressed in pituitary adenomas and increases their aggressive features.

    Science.gov (United States)

    Ibáñez-Costa, Alejandro; Gahete, Manuel D; Rivero-Cortés, Esther; Rincón-Fernández, David; Nelson, Richard; Beltrán, Manuel; de la Riva, Andrés; Japón, Miguel A; Venegas-Moreno, Eva; Gálvez, Ma Ángeles; García-Arnés, Juan A; Soto-Moreno, Alfonso; Morgan, Jennifer; Tsomaia, Natia; Culler, Michael D; Dieguez, Carlos; Castaño, Justo P; Luque, Raúl M

    2015-03-04

    Pituitary adenomas comprise a heterogeneous subset of pathologies causing serious comorbidities, which would benefit from identification of novel, common molecular/cellular biomarkers and therapeutic targets. The ghrelin system has been linked to development of certain endocrine-related cancers. Systematic analysis of the presence and functional implications of some components of the ghrelin system, including native ghrelin, receptors and the recently discovered splicing variant In1-ghrelin, in human normal pituitaries (n = 11) and pituitary adenomas (n = 169) revealed that expression pattern of ghrelin system suffers a clear alteration in pituitary adenomasas compared with normal pituitary, where In1-ghrelin is markedly overexpressed. Interestingly, in cultured pituitary adenoma cells In1-ghrelin treatment (acylated peptides at 100 nM; 24-72 h) increased GH and ACTH secretion, Ca(2+) and ERK1/2 signaling and cell viability, whereas In1-ghrelin silencing (using a specific siRNA; 100 nM) reduced cell viability. These results indicate that an alteration of the ghrelin system, specially its In1-ghrelin variant, could contribute to pathogenesis of different pituitary adenomas types, and suggest that this variant and its related ghrelin system could provide new tools to identify novel, more general diagnostic, prognostic and potential therapeutic targets in pituitary tumors.

  12. Advancing Treatment of Pituitary Adenomas through Targeted Molecular Therapies: The Acromegaly and Cushing Disease Paradigms

    Science.gov (United States)

    Mooney, Michael A.; Simon, Elias D.; Little, Andrew S.

    2016-01-01

    The current treatment of pituitary adenomas requires a balance of conservative management, surgical resection, and in select tumor types, molecular therapy. Acromegaly treatment is an evolving field where our understanding of molecular targets and drug therapies has improved treatment options for patients with excess growth hormone levels. We highlight the use of molecular therapies in this disease process and advances in this field, which may represent a paradigm shift for the future of pituitary adenoma treatment. PMID:27517036

  13. Advancing Treatment of Pituitary Adenomas through Targeted Molecular Therapies: The Acromegaly & Cushing Disease Paradigms

    Directory of Open Access Journals (Sweden)

    Michael Anthony Mooney

    2016-07-01

    Full Text Available The current treatment of pituitary adenomas requires a balance of conservative management, surgical resection, and in select tumor types, molecular therapy. Acromegaly treatment is an evolving field where our understanding of molecular targets and drug therapies has improved treatment options for patients with excess growth hormone levels. We highlight the use of molecular therapies in this disease process and advances in this field, which may represent a paradigm shift for the future of pituitary adenoma treatment.

  14. An FSH and TSH pituitary adenoma, presenting with precocious puberty and central hyperthyroidism

    OpenAIRE

    Guadalupe Vargas; Lourdes-Josefina Balcazar-Hernandez; Virgilio Melgar; Roser-Montserrat Magriña-Mercado; Baldomero Gonzalez; Javier Baquera; Moisés Mercado

    2017-01-01

    A 19-year-old woman with a history of isosexual precocious puberty and bilateral oophorectomy at age 10 years because of giant ovarian cysts, presents with headaches and mild symptoms and signs of hyperthyroidism. Hormonal evaluation revealed elevated FSH and LH levels in the postmenopausal range and free hyperthyroxinemia with an inappropriately normal TSH. Pituitary MRI showed a 2-cm macroadenoma with suprasellar extension. She underwent successful surgical resection of the pituitary tumor,...

  15. Single or group housing altered hormonal physiology and affected pituitary and interstitial cell kinetics

    Science.gov (United States)

    A significant negative correlation between testicular interstitial cell tumors and pituitary tumors in control male F344 rats has been reported associated with the number of animals per cage. Change in numbers of animals per cage may cause stress and increased serum corticosteroi...

  16. Effect of light-curing units and activation mode on polymerization shrinkage and shrinkage stress of composite resins.

    Science.gov (United States)

    Lopes, Lawrence Gonzaga; Franco, Eduardo Batista; Pereira, José Carlos; Mondelli, Rafael Francisco Lia

    2008-01-01

    The aim of this study was to evaluate the polymerization shrinkage and shrinkage stress of composites polymerized with a LED and a quartz tungsten halogen (QTH) light sources. The LED was used in a conventional mode (CM) and the QTH was used in both conventional and pulse-delay modes (PD). The composite resins used were Z100, A110, SureFil and Bisfil 2B (chemical-cured). Composite deformation upon polymerization was measured by the strain gauge method. The shrinkage stress was measured by photoelastic analysis. The polymerization shrinkage data were analyzed statistically using two-way ANOVA and Tukey test (p contraction and the stress values when compared to CM. LED generated the same stress as QTH in conventional mode. Regardless of the activation mode, SureFil produced lower contraction and stress values than the other light-cured resins. Conversely, Z100 and A110 produced the greatest contraction and stress values. As expected, the chemically cured resin generated lower shrinkage and stress than the light-cured resins. In conclusion, The PD mode effectively decreased contraction stress for Z100 and A110. Development of stress in light-cured resins depended on the shrinkage value.

  17. 垂体瘤患者视网膜神经纤维层厚度和视野变化参数相关性研究%Correlation between retinal neural fiber layer and visual field defect in pituitary tumor patients

    Institute of Scientific and Technical Information of China (English)

    施维; 钟勇; 董方田; 艾凤荣; 赵鹏

    2008-01-01

    Objective To study the correlation of retinal neural fiber layer and visual field defect and compare the sensitivity between GDxVCC and Octopus automated perimetry in the diagnosis and follow up of pituitary tumor patients.Methods 70 pituitary tumor patients(140 eyes),which were diagnosed with endocrinologic examination,MRI or surgical sample pathology in Peking Union Medical College hospital are included in the current study.These patients were examined with both GDxVcc and Octopus automated perimetry(VF).The correlation between the two methods with six parameters in 3 pairs(mean thickness,superior mean thickness and inferior mean thickness of GDxVcc,in comparision with mean sensitivity and square root of lossvariance of VF, nerve fiber indicator and mean defect respectively)were selected.The data of GDxVcc for neural fiber structure and VF for psychophysical function of visual pathway in pituitary tumor patients were analyzed.All the patients received VF test by Octopus 101 perimeter with the TOP program.Results VF for PPT patients posseses a sensitivity of 70.00%,specificity of 34.00%;GDxVCC has a sensitivity of 72.22%,specificity of 56.00%:the sensitivity of GDxVXX and VF combo method is 83.33%,while the specificity of combo method is 58.00%(with statistically significantly different from GDxVxx or VF alone).The correlation in terms of all paired parameters from GDxVCC and VF are statistically significant.The RNFL mean thickness,superior mean thickness,inferior mean thickness of GDxVcc are positively correlated with the mean sensitivity(MS),modified superior and inferior MS(P<0.01);left eyes changes showed the strongest correlation between the inferior sectoral RNFL and the superior VF indexes(P<0.01).On the other hand,the RNFL mean thickness of GDxVXX is negatively correlated to the square root of the loss variance(LS)of VF(P<0.01).Nerve fiber indicator showed Dositively correlated with the mean defect(MD)(P<0.01).Conclusions The combination of GDx

  18. Radiosurgery for pituitary adenomas; Radiocirurgia nos adenomas hipofisarios

    Energy Technology Data Exchange (ETDEWEB)

    Castro, Douglas Guedes de; Salvajoli, Joao Victor; Canteras, Miguel Montes; Cecilio, Soraya A. Jorge [Instituto de Radiocirurgia Neurologica, Sao Paulo, SP (Brazil)]. E-mail: dougguedes@uol.com.br

    2006-12-15

    Pituitary adenomas represent nearly 15% of all intracranial tumors. Multimodal treatment includes microsurgery, medical management and radiotherapy. Microsurgery is the primary recommendation for nonfunctioning and most of functioning adenomas, except for prolactinomas that are usually managed with dopamine agonist drugs. However, about 30% of patients require additional treatment after microsurgery for recurrent or residual tumors. In these cases, fractionated radiation therapy has been the traditional treatment. More recently, radiosurgery has been established as a treatment option. Radiosurgery allows the delivery of prescribed dose with high precision strictly to the target and spares the surrounding tissues. Therefore, the risks of hypopituitarism, visual damage and vasculopathy are significantly lower. Furthermore, the latency of the radiation response after radiosurgery is substantially shorter than that of fractionated radiotherapy. The goal of this review is to define the efficacy, safety and role of radiosurgery for treatment of pituitary adenomas and to present the preliminary results of our institution. (author)

  19. Recurrence of chromophobe pituitary adenomas after operation and postoperative radiotherapy

    Energy Technology Data Exchange (ETDEWEB)

    Salmi, J.; Pelkonen, R. (Third Department of Medicine, University of Helsinki, Finland); Grahne, B. (Department of Otorhinolaryngology, University oF Helsinki, finland); Valtonen, S. (Department of Neurosurgery, University of Helsinki, Finland)

    1982-01-01

    The rate of recurrence is reported in a prospective study of 56 patients (28 men, 28 women) with large chromophobe pituitary adenoma (with or without hyperprolactinemia). The surgical approach was transfrontal in 44 and transseptospehnoidal in 12 patients. Cryoapplication was combined with the transsphenoidal operation. All but one patient received postopertive pituitary irradiation. Altogether, 11 (20 %) clinical relapses (10 men) occurred between 0.5 and 6 years after the transfrontal operation. Patients that relapsed had had larger tumors than those remaining in remission. Occurence of the tumors appeared with a deterioration of the visual field defect in 9 patients. There were no differences in the degrees of hypopituitarism in patients who relapsed as compared to patients remaining in remission.

  20. Pediatric Suprasellar Tumors.

    Science.gov (United States)

    McCrea, Heather J; George, Emilie; Settler, Allison; Schwartz, Theodore H; Greenfield, Jeffrey P

    2016-10-01

    The various childhood suprasellar tumors, while pathologically distinct, present similar clinical and surgical challenges as a result of their common anatomic location. These lesions are in close proximity to or may invade the optic nerve and chiasm, pituitary gland and infundibulum, hypothalamus, and third ventricle, leading to presenting features including visual field loss, impairment in visual acuity, endocrine dysfunction, and hydrocephalus. Though many suprasellar lesions are relatively benign in pathology, treatment may be complicated by high surgical morbidity resulting from damage to the hypothalamic-pituitary axis. Here we review the most frequent pediatric lesions occurring in the suprasellar region: craniopharyngioma, chiasmatic glioma, germ cell tumor, Rathke cleft and arachnoid cysts, pituitary adenoma, and histiocytosis. This review outlines both common presenting features and differentiating aspects of these lesions. It also includes classic radiographic presentations and treatment considerations for each lesion.

  1. Screening for GPR101 defects in pediatric pituitary corticotropinomas.

    Science.gov (United States)

    Trivellin, Giampaolo; Correa, Ricardo R; Batsis, Maria; Faucz, Fabio R; Chittiboina, Prashant; Bjelobaba, Ivana; Larco, Darwin O; Quezado, Martha; Daly, Adrian F; Stojilkovic, Stanko S; Wu, T John; Beckers, Albert; Lodish, Maya; Stratakis, Constantine A

    2016-03-09

    Cushing disease (CD) in children is caused by adrenocorticotropic hormone (ACTH)-secreting pituitary adenomas. Germline or somatic mutations in genes such as MEN1, CDKIs, AIP, and USP8 have been identified in pediatric CD, but the genetic defects in a significant percentage of cases are still unknown. We investigated the orphan G protein-coupled receptor GPR101, a gene known to be involved in somatotropinomas, for its possible involvement in corticotropinomas. We performed GPR101 sequencing, expression analyses by RT-qPCR and immunostaining, and functional studies (cell proliferation, pituitary hormones secretion, and cAMP measurement) in a series of patients with sporadic CD secondary to ACTH-secreting adenomas in whom we had peripheral and tumor DNA (N=36). No increased GPR101 expression was observed in tumors compared to normal pituitary (NP) tissues, nor did we find a correlation between GPR101 and ACTH expression levels. Sequence analysis revealed a very rare germline heterozygous GPR101 variant (p.G31S) in one patient with CD. Overexpression of the p.G31S variant did not lead to increased growth and proliferation, although modest effects on cAMP signaling were seen. GPR101 is not overexpressed in ACTH-secreting tumors compared to NPs. A rare germline GPR101 variant was found in one patient with CD but in vitro studies did not support a consistent pathogenic effect. GPR101 is unlikely to be involved in the pathogenesis of CD.

  2. Plastic and free shrinkages cracking of blended white cement concrete

    Energy Technology Data Exchange (ETDEWEB)

    Rashad, A.M.; White, T.; Ariaratnam, S.; Knutson, K. [Housing and Building National Research Center, Cairo (Egypt)

    2007-07-01

    This paper presented the results of a study that investigated the plastic and free shrinkages of white portland cement concrete, concrete incorporating silica fume (SF) and concrete incorporating metakaolin (MK) compared to regular plain gray portland cement concrete. An experimental program was designed to investigate the plastic and free shrinkage of concrete containing gray and white blended cement. The paper discussed the experimental details including materials and cement types such as SF, MK, aggregate, and superplasticizer as well as concrete mixtures and specimen preparation including mixture proportions, preparation and curing of concrete specimens, and test specimens. It also presented the determination of concrete properties such as slump of fresh concrete, plastic shrinkage, and dry shrinkage. Test results and discussion of results were also provided. It was concluded that plain white portland cement concrete showed less number of plastic cracks but slightly higher average crack width compared to other concrete mixtures with MK or SF. In addition, free shrinkage behavior of plain white cement and plain gray cement matrix was comparable. 23 refs.

  3. Geosynthetic clay liners shrinkage under simulated daily thermal cycles.

    Science.gov (United States)

    Sarabadani, Hamid; Rayhani, Mohammad T

    2014-06-01

    Geosynthetic clay liners are used as part of composite liner systems in municipal solid waste landfills and other applications to restrict the escape of contaminants into the surrounding environment. This is attainable provided that the geosynthetic clay liner panels continuously cover the subsoil. Previous case histories, however, have shown that some geosynthetic clay liner panels are prone to significant shrinkage and separation when an overlying geomembrane is exposed to solar radiation. Experimental models were initiated to evaluate the potential shrinkage of different geosynthetic clay liner products placed over sand and clay subsoils, subjected to simulated daily thermal cycles (60°C for 8 hours and 22°C for 16 hours) modelling field conditions in which the liner is exposed to solar radiation. The variation of geosynthetic clay liner shrinkage was evaluated at specified times by a photogrammetry technique. The manufacturing techniques, the initial moisture content, and the aspect ratio (ratio of length to width) of the geosynthetic clay liner were found to considerably affect the shrinkage of geosynthetic clay liners. The particle size distribution of the subsoil and the associated suction at the geosynthetic clay liner-subsoil interface was also found to have significant effects on the shrinkage of the geosynthetic clay liner.

  4. Effect of light-curing units and activation mode on polymerization shrinkage and shrinkage stress of composite resins

    Directory of Open Access Journals (Sweden)

    Lawrence Gonzaga Lopes

    2008-02-01

    Full Text Available The aim of this study was to evaluate the polymerization shrinkage and shrinkage stress of composites polymerized with a LED and a quartz tungsten halogen (QTH light sources. The LED was used in a conventional mode (CM and the QTH was used in both conventional and pulse-delay modes (PD. The composite resins used were Z100, A110, SureFil and Bisfil 2B (chemical-cured. Composite deformation upon polymerization was measured by the strain gauge method. The shrinkage stress was measured by photoelastic analysis. The polymerization shrinkage data were analyzed statistically using two-way ANOVA and Tukey test (p<0.05, and the stress data were analyzed by one-way ANOVA and Tukey's test (p<0.05. Shrinkage and stress means of Bisfil 2B were statistically significant lower than those of Z100, A110 and SureFil. In general, the PD mode reduced the contraction and the stress values when compared to CM. LED generated the same stress as QTH in conventional mode. Regardless of the activation mode, SureFil produced lower contraction and stress values than the other light-cured resins. Conversely, Z100 and A110 produced the greatest contraction and stress values. As expected, the chemically cured resin generated lower shrinkage and stress than the light-cured resins. In conclusion, The PD mode effectively decreased contraction stress for Z100 and A110. Development of stress in light-cured resins depended on the shrinkage value.

  5. 99mTc(V)-DMSA. A useful radio isotopic material for the diagnosis of pituitary adenoma

    Energy Technology Data Exchange (ETDEWEB)

    Suzuki, Shinichi; Yamamura, Koji; Chang, Chia-Cheng; Kojima, Yasuhiro; Yamamoto, Isao; Ikegami, Tadashi [Yokohama City Univ., Kanagawa (Japan). School of Medicine

    2000-06-01

    We compared images of pituitary adenoma, parasellar tumors, and non-pituitary adenoma using the tumor-seeking agent technetium-99m-labeled pentavalent dimercaptosuccinic acid (99mTc(V)-DMSA) and evaluated the relationship between 99mTc(V)-DMSA uptake and pituitary hormone level. Fifteen patients with pituitary adenoma were studied: 3 non-functioning adenoma, 6 prolactinoma, 4 GH secreting adenoma, and 2 ACTH secreting adenoma. As a control group, we studied 6 patients without adenoma who had undergone a pathological examination. Planar and SPECT images were obtained 2-hours after intravenous injection of approximately 740 MBq 99mTc(V)-DMSA. Uptake ratios between normal background and tumor lesion were calculated. Three non-functioning adenoma (100%), five prolactinoma (83%), three GH secreting adenoma (75%) and no ACTH secreting adenoma (0%) significantly concentrated 99mTc(V)-DMSA. One of the non-adenomatous tumors, a Rathke's cleft cyst concentrated 99mTc(V)-DMSA in the pituitary while the others did not. The 99mTc(V)-DMSA scintigraphy showed an overall sensitivity of 73% (11/15) in detecting pituitary adenomas. Uptake ratios were higher in hormone-secreting adenoma than non-secreting adenoma. We were able to detect residual tumors and distinguish pituitary adenoma from surgical non-tumoral lesion with 99mTc(V)-DMSA. These results suggest that 99mTc(V)-DMSA imaging is useful in detecting pituitary adenoma and noninvasively differentiating tumor types in parasellar lesion. (author)

  6. Purification of pituitary autoantigen by column liquid chromatography and chromatofocusing

    OpenAIRE

    Gut, Paweł; Fischbach, Jakub; Ziemnicka, Katarzyna; Bączyk, Maciej; Baszko-Błaszyk, Daria; Wrotkowska, Elżbieta; Ruchała, Marek

    2014-01-01

    Introduction Pituitary autoantibodies can be determined both in patients with pituitary disease as well as patients with autoimmune endocrine diseases. The purpose of the study was to isolate and purify pituitary autoantigen using sera of patients and the microsomal fraction of the pituitary. Material and methods To isolate a pituitary autoantigen, patient sera were used, which showed a strong immune response to pituitary antigens. Pituitary microsomal fractions were prepared from pituitary t...

  7. Expression of Transcription Factor E2F-1 and Pituitary Tumor Transforming Gene(PTTG)in Rat Prolactinoma%转录因子E2F-1与垂体肿瘤转化基因(PTTG)在大鼠PRL瘤中的表达

    Institute of Scientific and Technical Information of China (English)

    程海梅; 徐春; 杨雪梅; 刘晓军

    2011-01-01

    目的 通过检测垂体肿瘤转化基因(PTTG)与腺病毒E2启动子结合因子1(E2F-1)在大鼠催乳素(PRL)瘤中的表达来探讨两者在PRL瘤发生发展过程中的作用.方法 40只大鼠随机分为两组:实验组(E组,n=20):皮下植入17β-雌二醇的方法诱发大鼠PRL瘤;对照组(C组,n=20):皮下植入空白硅胶管.雌激素诱导10周后处死大鼠,心脏穿刺取血,4%多聚甲醛体内灌流取出脑垂体,称重,ELISA方法检测两组大鼠血清PRL水平,垂体组织行病理组织学观察,免疫组化SP方法检测两组大鼠垂体组织中PTTG蛋白质、E2 F-1蛋白质的表达.结果 雌二醇作用10周后,据垂体重量、垂体组织学变化和血清PRL水平证实PRL瘤诱导成功.PRL瘤组中,PTTG蛋白质、E2F-1蛋白质均明显高于对照组,差异具有统计学意义(P <0.01);且PTTG蛋白质和E2F-1蛋白质的表达呈明显正相关(γ=0.764,P<0.01).结论 PTTG与 E2F-1在大鼠PRL瘤中共同过度表达,参与了大鼠PRL瘤的发生发展.%Objective To detect the expression of adenovirus E2 promoter binding factor 1 ( E2F-1) and Pituitary tumor transforming gene ( PTTG) in rat prolactinoma and to explore their role in the development of prolactinoma. Methods 40 male Wistar( 120 ~ 150g) rats were randomly divided into two groups; experimental group ( E group, n = 20): 170-estradiol stuffed in silicone tube was subcutaneously implanted to induce rat prolactinoma model; the control group (C group, n =20) blank silicone tube was subcutaneously implanted. After 10 weeks, all the rats were executed, blood was taken by cardiac puncture, 4% paraformaldehyde was intracardially perfused and pituitary tissues were harvested, weighed. Serum PRL levels were detected by ELISA method; Pituitary tissue histopathological changes were observed; both expression of PTTG protein and E2F-1 protein were detected by immunohistochemistry SP method. Result! Prolactinoma models were induced successfully as reflected by pituitary

  8. Delayed sequelae of pituitary irradiation

    Energy Technology Data Exchange (ETDEWEB)

    Woodruff, K.H.; Lyman, J.T.; Lawrence, J.H.; Tobias, C.A.; Born, J.L.; Fabrikant, J.I.

    1984-01-01

    Since 1958, 781 patients at Lawrence Berkeley Laboratory have received helium-particle stereotactic radiosurgery to the adenohypophysis. Autopsy findings in 15 of these patients are reported. Ten patients received pituitary radiation (average dose, 116 Gy in six fractions) for progressive neovascularization retinopathy due to diabetes mellitus. Evidence of a time-dependent course of progressive fibrosis in their pituitary glands was found. Five patients were treated for eosinophilic adenomas. Although they had lower average doses of radiation (56 Gy in six fractions), their pituitary glands showed cystic cavitation of the adenomas. The adenomas thus appeared more radiosensitive than the normal pars anterior, which, in turn, was more radiosensitive than the adjacent neurohypophysis. No significant radiation changes were found in the surrounding brain or cranial nerves. The endocrine organs under pituitary control showed varying degrees of atrophy, and clinical tests revealed progressive hypofunction. It was concluded that charged-particle therapy produced a sharply delineated focal ral tests revealed progressive hypofunction. It was concluded that charged-particle therapy produced a sharply delineated focal radiation lesion confined to the pituitary gland but did not cause injury to the critical structures of the surrounding central nervous system.

  9. Seesaw nystagmus caused by giant pituitary adenoma: case report Nistagmo em gangorra causado por adenoma pituitário gigante: relato de caso

    OpenAIRE

    Frederico Castelo Moura; Allan Christian Pieroni Gonçalves; Mário Luiz Ribeiro Monteiro

    2006-01-01

    Giant pituitary adenomas are uncommonly large tumors, greater than 4 cm in size that can produces endocrine symptoms, visual loss and cranial nerve palsies. We report the rare occurrence of seesaw nystagmus as the presenting sign of giant pituitary adenoma. A 50-year-old man presented with headache associated with visual loss and seesaw nystagmus. Perimetry revealed bitemporal hemianopia and magnetic resonance imaging showed a giant pituitary adenoma. After surgery, nystagmus disappeared. Our...

  10. Sellar tumors; Tumoren der Sellaregion

    Energy Technology Data Exchange (ETDEWEB)

    Weber, M.A.; Essig, M. [Deutsches Krebsforschungszentrum, Heidelberg (Germany). Abt. Radiologie; Zoubaa, S. [GSF - Forschungszentrum fuer Gesundheit und Umwelt, Neuherberg, Muenchen (Germany). Abt. Neuropathologie; Politi, M.; Grunwald, I. [Universitaetsklinikum Saarland, Homburg (Germany). Klinik fuer Diagnostische und Interventionelle Neuroradiologie

    2007-06-15

    Because of the complex anatomy, examination of the sella turcica and hypophysis needs a dedicated MR sequence protocol. Not every sellar lesion is a pituitary adenoma. Thus, this review article summarizes the most frequently encountered intra-, supra-, and parasellar tumors and lesions. Differential diagnoses comprise besides adenoma among others craniopharyngioma, meningioma, glioma, germinoma, hamartoma, aneurysm, trigeminal schwannoma, pituitary carcinoma, chordoma, metastasis, infection, and empty sella. Characteristic imaging findings are presented and correlated to micro- and macro-pathology. (orig.)

  11. Linear Shrinkage Behaviour of Compacted Loam Masonry Blocks

    Directory of Open Access Journals (Sweden)

    NAWAB ALI LAKHO

    2017-04-01

    Full Text Available Walls of wet loam, used in earthen houses, generally experience more shrinkage which results in cracks and less compressive strength. This paper presents a technique of producing loam masonry blocks that are compacted in drained state during casting process in order to minimize shrinkage. For this purpose, loam masonry blocks were cast and compacted at a pressure of 6 MPa and then dried in shade by covering them in plastic sheet. The results show that linear shrinkage of 2% occurred which is smaller when compared to un-compacted wet loam walls. This implies that the loam masonry blocks compacted in drained state is expected to perform better than un-compacted wet loam walls.

  12. Brain shrinkage and subdural effusion associated with ACTH administration.

    Science.gov (United States)

    Satoh, J; Takeshige, H; Hara, H; Fukuyama, Y

    1982-01-01

    Sequential computed tomographic (CT) studies of 11 patients (aged five months to seven years) with intractable epilepsy treated with synthetic ACTH-Z showed brain shrinkage in all cases. Brain shrinkage started to appear on daily ACTH injections for seven days, reached the maximum within four weeks of administration (14 injections every day and then 7 injections every other day), and almost returned to the original status in seven out of nine cases which were followed up for one to three months after the therapy. The subjects aged less than two years showed more remarkable brain shrinkage than did those aged more than five years. Furthermore, two other cases were complicated by subdural effusion after ACTH therapy. It is the authors' assumption that both of these phenomena are caused by the high concentration of corticosteroid through a change of the water and electrolyte contents in the brain.

  13. Compressive dynamic range imaging via Bayesian shrinkage dictionary learning

    Science.gov (United States)

    Yuan, Xin

    2016-12-01

    We apply the Bayesian shrinkage dictionary learning into compressive dynamic-range imaging. By attenuating the luminous intensity impinging upon the detector at the pixel level, we demonstrate a conceptual design of an 8-bit camera to sample high-dynamic-range scenes with a single snapshot. Coding strategies for both monochrome and color cameras are proposed. A Bayesian reconstruction algorithm is developed to learn a dictionary in situ on the sampled image, for joint reconstruction and demosaicking. We use global-local shrinkage priors to learn the dictionary and dictionary coefficients representing the data. Simulation results demonstrate the feasibility of the proposed camera and the superior performance of the Bayesian shrinkage dictionary learning algorithm.

  14. Improving the Incoherence of a Learned Dictionary via Rank Shrinkage.

    Science.gov (United States)

    Ubaru, Shashanka; Seghouane, Abd-Krim; Saad, Yousef

    2017-01-01

    This letter considers the problem of dictionary learning for sparse signal representation whose atoms have low mutual coherence. To learn such dictionaries, at each step, we first update the dictionary using the method of optimal directions (MOD) and then apply a dictionary rank shrinkage step to decrease its mutual coherence. In the rank shrinkage step, we first compute a rank 1 decomposition of the column-normalized least squares estimate of the dictionary obtained from the MOD step. We then shrink the rank of this learned dictionary by transforming the problem of reducing the rank to a nonnegative garrotte estimation problem and solving it using a path-wise coordinate descent approach. We establish theoretical results that show that the rank shrinkage step included will reduce the coherence of the dictionary, which is further validated by experimental results. Numerical experiments illustrating the performance of the proposed algorithm in comparison to various other well-known dictionary learning algorithms are also presented.

  15. Prediction of ALLOY SHRINKAGE FACTORS FOR THE INVESTMENT CASTING PROCESS

    Energy Technology Data Exchange (ETDEWEB)

    Sabau, Adrian S [ORNL

    2006-01-01

    This study deals with the experimental measurements and numerical predictions of alloy shrinkage factors (SFs) related to the investment casting process. The dimensions of the A356 aluminum alloy casting were determined from the numerical simulation results of solidification, heat transfer, fluid dynamics, and deformation phenomena. The investment casting process was carried out using wax patterns of unfilled wax and shell molds that were made of fused silica with a zircon prime coat. The dimensions of the die tooling, wax pattern, and casting were measured, in order to determine the actual tooling allowances. Several numerical simulations were carried out, to assess the level of accuracy for the casting shrinkage. The solid fraction threshold, at which the transition from the fluid dynamics to the solid dynamics occurs, was found to be important in predicting shrinkage factors (SFs). It was found that accurate predictions were obtained for all measued dimensions when the shell mold was considered a deformable material.

  16. Pituitary aspergillosis abscess in an immunocompetent black ...

    African Journals Online (AJOL)

    Pituitary aspergillosis abscess in an immunocompetent black woman. ... female patient showed up with amenorrhea-galactorrhea syndrome with infertility for several years. The CT Findings and hormonal studies strongly suggested pituitary ...

  17. Dynamic MR imaging for diagnosis of lesions adjacent to pituitary gland

    Energy Technology Data Exchange (ETDEWEB)

    Suzuki, Masayuki; Matsui, Osamu; Ueda, Fumiaki; Matsushita, Tsuyoshi; Fujinaga, Yasunari; Kobayashi, Keiko; Horichi, Yasushi; Hayashi, Yutaka; Tachibana, Osamu; Yamashita, Junkoh

    2005-02-01

    In this study, we evaluated the usefulness of dynamic studies for the preoperative diagnosis of tumor lesions adjacent to the pituitary gland. We examined 13 tumors. We obtained pre- and post-contrast thin slice T1-weighted images of the sellar regions. FSE sequences were used for dynamic study. The capability to distinguish the tumor from the pituitary gland and additional information obtained from the dynamic study were evaluated. Two meningiomas were identified more clearly on the dynamic than on the delayed study. In two cavernous hemangiomas, the peripheral nodular stains gradually increased during the dynamic study. For the preoperative evaluation of lesions adjacent to the pituitary gland, the dynamic study can often identify the lesions more clearly and may provide additional information.

  18. Shrinkage anisotropy characteristics from soil structure and initial sample/layer size

    CERN Document Server

    Chertkov, V Y

    2014-01-01

    The objective of this work is a physical prediction of such soil shrinkage anisotropy characteristics as variation with drying of (i) different sample/layer sizes and (ii) the shrinkage geometry factor. With that, a new presentation of the shrinkage anisotropy concept is suggested through the sample/layer size ratios. The work objective is reached in two steps. First, the relations are derived between the indicated soil shrinkage anisotropy characteristics and three different shrinkage curves of a soil relating to: small samples (without cracking at shrinkage), sufficiently large samples (with internal cracking), and layers of similar thickness. Then, the results of a recent work with respect to the physical prediction of the three shrinkage curves are used. These results connect the shrinkage curves with the initial sample size/layer thickness as well as characteristics of soil texture and structure (both inter- and intra-aggregate) as physical parameters. The parameters determining the reference shrinkage c...

  19. Spontaneous regression of nonfunctioning pituitary macroadenoma: A case report

    Directory of Open Access Journals (Sweden)

    Koki Kameno

    2016-09-01

    Full Text Available A case involving a 13-year-old girl with nonfunctioning pituitary macroadenoma is discussed. The patient visited the hospital for checkup after experiencing a head injury secondary to syncope. A computed tomography (CT scan revealed a pituitary mass with mildly higher density. Magnetic resonance imaging (MRI with contrast enhancement showed that the mass contained a hyperintense area and it elevated the optic chiasm. The patient had blurred vision in her right eye. No endocrinological abnormalities were found. When the patient was admitted for surgical removal of the mass 1 month later, her visual acuity had improved. A repeat MRI showed that the size of the pituitary mass had dramatically reduced. During the following 2 years, the mass showed further reduction in size and did not re-grow. Since symptoms of pituitary apoplexy were not observed, we believe that asymptomatic apoplexy occurring at the time of the first visit may have caused regression of the tumor.

  20. Optimal linear shrinkage corrections of sample LMMSE and MVDR estimators

    OpenAIRE

    2012-01-01

    La proposició d'estimadors shrinkage òptims que corregeixen la degradació dels mètodes sample LMMSE i sample MUDR en el règim on el número de mostres és petit en comparació a la dimensió de les observacions. [ANGLÈS] This master thesis proposes optimal shrinkage estimators that counteract the performance degradation of the sample LMMSE and sample MVDR methods in the regime where the sample size is small compared to the observation dimension. [CASTELLÀ] Esta máster tesis propone estimado...

  1. Hydration of Portoguese cements, measurement and modelling of chemical shrinkage

    DEFF Research Database (Denmark)

    Maia, Lino; Geiker, Mette Rica; Figueiras, Joaquim A.

    2008-01-01

    form of the dispersion model. The development of hydration varied between the investigated cements; based on the measured data the degree of hydration after 24 h hydration at 20 C varied between 40 and 50%. This should be taken into account when comparing properties of concrete made from the different......Development of cement hydration was studied by measuring the chemical shrinkage of pastes. Five types of Portuguese Portland cement were used in cement pastes with . Chemical shrinkage was measured by gravimetry and dilatometry. In gravimeters results were recorded automatically during at least...

  2. Endoscopic endonasal trans-sphenoid surgery of pituitary adenoma

    Directory of Open Access Journals (Sweden)

    Y R Yadav

    2012-01-01

    Full Text Available Endoscopic endonasal trans-sphenoid surgery (EETS is increasingly used for pituitary lesions. Pre-operative CT and MRI scans and peroperative endoscopic visualization can provide useful anatomical information. EETS is indicated in sellar, suprasellar, intraventricular, retro-infundibular, and invasive tumors. Recurrent and residual lesions, pituitary apoplexy and empty sella syndrome can be managed by EETS. Modern neuronavigation techniques, ultrasonic aspirators, ultrasonic bone curette can add to the safety. The binostril approach provides a wider working area. High definition camera is much superior to three-chip camera. Most of the recent reports favor EETS in terms of safety, quality of life and tumor resection, hospital stay, better endocrinological, and visual outcome as compared to the microscopic technique. Nasal symptoms, blood loss, operating time are less in EETS. Various naso-septal flaps and other techniques of CSF leak repair could help reduce complications. Complications can be further reduced after achieving the learning curve, good understanding of limitations with proper patient selection. Use of neuronavigation, proper post-operative care of endocrine function, establishing pituitary center of excellence and more focused residency and endoscopic fellowship training could improve results. The faster and safe transition from microscopic to EETS can be done by the team concept of neurosurgeon/otolaryngologist, attending hands on cadaveric dissection, practice on models, and observation of live surgeries. Conversion to a microscopic or endoscopic-assisted approach may be required in selected patients. Multi-modality treatment could be required in giant and invasive tumors. EETS appears to be a better surgical option in most pituitary adenoma.

  3. Endoscopic endonasal trans-sphenoid surgery of pituitary adenoma.

    Science.gov (United States)

    Yadav, Yr; Sachdev, S; Parihar, V; Namdev, H; Bhatele, Pr

    2012-09-01

    Endoscopic endonasal trans-sphenoid surgery (EETS) is increasingly used for pituitary lesions. Pre-operative CT and MRI scans and peroperative endoscopic visualization can provide useful anatomical information. EETS is indicated in sellar, suprasellar, intraventricular, retro-infundibular, and invasive tumors. Recurrent and residual lesions, pituitary apoplexy and empty sella syndrome can be managed by EETS. Modern neuronavigation techniques, ultrasonic aspirators, ultrasonic bone curette can add to the safety. The binostril approach provides a wider working area. High definition camera is much superior to three-chip camera. Most of the recent reports favor EETS in terms of safety, quality of life and tumor resection, hospital stay, better endocrinological, and visual outcome as compared to the microscopic technique. Nasal symptoms, blood loss, operating time are less in EETS. Various naso-septal flaps and other techniques of CSF leak repair could help reduce complications. Complications can be further reduced after achieving the learning curve, good understanding of limitations with proper patient selection. Use of neuronavigation, proper post-operative care of endocrine function, establishing pituitary center of excellence and more focused residency and endoscopic fellowship training could improve results. The faster and safe transition from microscopic to EETS can be done by the team concept of neurosurgeon/otolaryngologist, attending hands on cadaveric dissection, practice on models, and observation of live surgeries. Conversion to a microscopic or endoscopic-assisted approach may be required in selected patients. Multi-modality treatment could be required in giant and invasive tumors. EETS appears to be a better surgical option in most pituitary adenoma.

  4. An efficient reconstruction method for bioluminescence tomography based on two-step iterative shrinkage approach

    Science.gov (United States)

    Guo, Wei; Jia, Kebin; Tian, Jie; Han, Dong; Liu, Xueyan; Wu, Ping; Feng, Jinchao; Yang, Xin

    2012-03-01

    Among many molecular imaging modalities, Bioluminescence tomography (BLT) is an important optical molecular imaging modality. Due to its unique advantages in specificity, sensitivity, cost-effectiveness and low background noise, BLT is widely studied for live small animal imaging. Since only the photon distribution over the surface is measurable and the photo propagation with biological tissue is highly diffusive, BLT is often an ill-posed problem and may bear multiple solutions and aberrant reconstruction in the presence of measurement noise and optical parameter mismatches. For many BLT practical applications, such as early detection of tumors, the volumes of the light sources are very small compared with the whole body. Therefore, the L1-norm sparsity regularization has been used to take advantage of the sparsity prior knowledge and alleviate the ill-posedness of the problem. Iterative shrinkage (IST) algorithm is an important research achievement in a field of compressed sensing and widely applied in sparse signal reconstruction. However, the convergence rate of IST algorithm depends heavily on the linear operator. When the problem is ill-posed, it becomes very slow. In this paper, we present a sparsity regularization reconstruction method for BLT based on the two-step iterated shrinkage approach. By employing Two-step strategy of iterative reweighted shrinkage (IRS) to improve IST, the proposed method shows faster convergence rate and better adaptability for BLT. The simulation experiments with mouse atlas were conducted to evaluate the performance of proposed method. By contrast, the proposed method can obtain the stable and comparable reconstruction solution with less number of iterations.

  5. Quantitative analysis of anatomical relationship between cavernous segment internal carotid artery and pituitary macroadenoma

    Science.gov (United States)

    Lin, Bon-Jour; Chung, Tzu-Tsao; Lin, Meng-Chi; Lin, Chin; Hueng, Dueng-Yuan; Chen, Yuan-Hao; Hsia, Chung-Ching; Ju, Da-Tong; Ma, Hsin-I; Liu, Ming-Ying; Tang, Chi-Tun

    2016-01-01

    Abstract Cavernous segment internal carotid artery (CSICA) injury during endoscopic transsphenoidal surgery for pituitary tumor is rare but fatal. The aim of this study is to investigate anatomical relationship between pituitary macroadenoma and corresponding CSICA using quantitative means with a sense to improve safety of surgery. In this retrospective study, a total of 98 patients with nonfunctioning pituitary macroadenomas undergoing endoscopic transsphenoidal surgeries were enrolled from 2005 to 2014. Intercarotid distances between bilateral CSICAs were measured in the 4 coronal levels, namely optic strut, convexity of carotid prominence, median sella turcica, and dorsum sellae. Parasellar extension was graded and recorded by Knosp–Steiner classification. Our findings indicated a linear relationship between size of pituitary macroadenoma and intercarotid distance over CSICA. The correlation was absent in pituitary macroadenoma with Knosp–Steiner grade 4 parasellar extension. Bigger pituitary macroadenoma makes more lateral deviation of CSICA. While facing larger tumor, sufficient bony graft is indicated for increasing surgical field, working area and operative safety. PMID:27741111

  6. Ectopic Acromegaly Arising from a Pituitary Adenoma within the Bony Intersphenoid Septum of a Patient with Empty Sella Syndrome

    Science.gov (United States)

    Arzamendi, Audrey E.; Shahlaie, Kiarash; Latchaw, Richard E.; Lechpammer, Mirna; Arzumanyan, Hasmik

    2016-01-01

    Objective  To describe the work-up and treatment of rare ectopic acromegaly caused by a biopsy-proven somatotroph pituitary adenoma located within the bony intersphenoid septum of a patient with empty sella syndrome (ESS). Methods  We report the presentation, clinical course, diagnostic work-up, and lesion localization and treatment challenges encountered in a 55-year-old patient, with a brief review of relevant literature. Results  A 55-year-old African-American man presented with acromegaly and ESS. Attempts to definitively localize the causative tumor were unsuccessful, though petrosal sinus sampling supported central growth hormone production and imaging suggested bone-enclosed subsellar pituitary tissue. Endoscopic endonasal transphenoidal exploration was undertaken with resection of a somatotroph pituitary microadenoma, and subsequent clinical improvement and biochemical remission. Retrospective review revealed the patient's pituitary to have been located ectopically within a unique bony intersphenoid septum. Conclusion  This report describes the first known case of an ectopic pituitary adenoma located within the midline bony intersphenoid septum, which we postulate to have resulted from anomalous embryological pituitary migration. Intra-intersphenoid septal tumors should be considered in cases of apparent central acromegaly with ESS or absence of tumor tissue within the paranasal sinuses or other peripheral locations. Indexing  Acromegaly, ESS, pituitary adenoma, sphenoid sinus septum. PMID:27468406

  7. Use of DES-treated rats as an animal model for assessment of pituitary adenoma imaging agents

    Energy Technology Data Exchange (ETDEWEB)

    Otto, C.A.; Marshall, J.C.; Lloyd, R.V.; Sherman, P.S.; Fisher, S.J.; Valoppi, V.L.; Rogers, W.L.; Wieland, D.M.

    1986-01-01

    Prolactin (PRL) secreting pituitary adenomas are the most common type of pituitary tumors. An imaging agent which specifically localized in prolactinomas would be of considerable clinical value. Tritiated spiroperidol (/sup 3/HSp) was selected for initial evaluation as a possible imaging agent based on: (1) demonstrated localization in the pituitary and (2) demonstrated binding to human PRL-secreting tumor tissue. DES was implanted in Fischer F344 rats which induced prolactinoma formation. /sup 3/HSp concentrations in pituitary and other tissues of DES-treated rats were assessed in female rats and correlation studies showed that a 5-fold increase in serum PRL was associated with a 6-fold increase in both pituitary weight and % dose/organ accumulation of /sup 3/HSp. The number of pituitary D/sub 2/ receptors per mg of protein in tissue homogenates was similar in both normal and DES-treated females. A blocking study with (+)-butaclamol demonstrated a D/sub 2/ receptor-mediated component to /sup 3/HSp localization. In summary, an animal model for prolactinoma was characterized. An assessment of /sup 3/HSp accumulation indicates that radiolabelled spiroperidol shows excellent potential for detecting PRL-secreting tumors of the pituitary.

  8. Stubborn hiccups as a sign of massive apoplexy in a naive acromegaly patient with pituitary macroadenoma

    Directory of Open Access Journals (Sweden)

    Gulay Simsek Bagir

    2017-05-01

    Full Text Available Pituitary apoplexy (PA may very rarely present with hiccups. A 32-year-old man with classical acromegaloid features was admitted with headache, nausea, vomiting and stubborn hiccups. Pituitary magnetic resonance imaging (MRI demonstrated apoplexy of a macroadenoma with suprasellar extension abutting the optic chiasm. Plasma growth hormone (GH levels exhibited suppression (below <1 ng/mL at all time points during GH suppression test with 75 g oral glucose. After treatment with corticosteroid agents, he underwent transsphenoidal pituitary surgery and hiccups disappeared postoperatively. The GH secretion potential of the tumor was clearly demonstrated immunohistochemically. We conclude that stubborn hiccups in a patient with a pituitary macroadenoma may be a sign of massive apoplexy that may result in hormonal remission.

  9. Studies on prolactin-secreting cells in aging rats of different strains. I. Alterations in pituitary histology and serum prolactin levels as related to ageing.

    NARCIS (Netherlands)

    Putten, van L.J.A.; Zwieten, van M.J.; Mattheij, J.A.M.; Kemenade, J.A.M.

    1988-01-01

    Serum PRL levels and histologically tumor-free pituitary glands of 91 aging rats of the BN/BiRij strain, the WAG/Rij strain and their F1 hybrid were studied. In rats with pituitary glands without signs of hyperplasia, serum PRL levels were, in comparison to rats of 15-24 months, increased 25-29-mont

  10. Clinical Exper ience of Continuous Lumbar Cistern Drainage in the Treatment of Pituitary Tumor Postoperative Cerebrospinal Fluid Leakage after Butterfly%垂体瘤经蝶术后脑脊液漏采用腰大池持续外引流治疗的临床体会

    Institute of Scientific and Technical Information of China (English)

    罗安志

    2014-01-01

    O bjective To summarize the clinical experience of continuous lumbar cistern drainage in the treatment of pituitary tumor postoperative cerebrospinal fluid leakage after butterfly. Meth-ods Pituitary tumor in our hospital were selected by transsphenoidal postoperative cerebrospinal fluid leakage in 78 patients, according to treatment time, they were divided into the observation group and control group. The control group were given routine craniotomy treatment, observation group were treated with continuous lumbar cistern drainage treatment. Clinical effect was compared in two groups. Results In the control group, total effective rate was 71.8%, total effective rate in observation group was 96.2%, with significant differences in the two groups(P<0.05); Cerebrospinal fluid leakage control time, hospitalization time of observation group were better than that in con-trol group, with significant difference (P<0.05);2 patients in control group occurred secondary in-tracranial infection, no patients with secondary infection were in observation group, statistically significant differences in the two groups (P<0.05). Conclusion Continuous lumbar cistern drainage in the treatment of pituitary tumor postoperative cerebrospinal fluid leakage after butterfly, can significantly relieve the symptoms, short the hospitalization time, improve the clinical treatment ef-fect and be worthy of further promotion.%目的:总结垂体瘤经蝶术后脑脊液漏采用腰大池持续外引流治疗的临床体会。方法选取我院收治的垂体瘤经蝶术后脑脊液漏患者78例,按治疗时间分为对照组和观察组,对照组患者给予常规开颅手术治疗,观察组患者给予腰大池持续外引流治疗,比较两组患者的临床效果。结果对照组治疗总有效率为71.8%,观察组治疗总有效率96.2%,两组比较差异具有统计学意义(P<0.05);观察组脑脊液漏控制时间、住院时间均优于对照组,差

  11. Stiffness and shrinkage of green and dry joists

    Science.gov (United States)

    Lyman W. Wood; Lawrence A. Soltis

    1964-01-01

    This report gives information on the edgewise modulus of elasticity, stiffness, and shrinkage of 360 joists in three species, three grades, and two sizes, each species obtained from two sources. Each joist was evaluated nondestructively at four moisture content values ranging from the green condition to about 11 percent. Information is also given on specific gravity,...

  12. Effect of processing conditions on shrinkage in injection molding

    NARCIS (Netherlands)

    Jansen, K.M.B.; Dijk, van D.J.; Husselman, M.H.

    1998-01-01

    A systematic study on the effect of processing conditions on mold shrinkage was undertaken for seven common thermoplastic polymers. It turned out that the holding pressure was always the key parameter. The effect of the melt temperature is slightly less important. Injection velocity and mold tempera

  13. Postoperative sensitivity associated with low shrinkage versus conventional composites

    OpenAIRE

    Ivanović Vladimir; Savić-Stanković Tatjana; Karadžić Branislav; Ilić Jugoslav; Santini Ario; Beljić-Ivanović Katarina

    2013-01-01

    Introduction. Postoperative sensitivity in restorative dentistry can be related to preparation trauma, dentin adhesives’ ability to seal open dentinal tubules, deformation of restorations under occlusal stresses and microleakage. Objective. The study assessed possible reduction in postoperative sensitivity with low shrinkage compared to conventional composites using different bonding agents and the influence of the operator skill on the incidence of postoperative sensitivity. Methods. N...

  14. Pituitary gigantism: Causes and clinical characteristics.

    Science.gov (United States)

    Rostomyan, Liliya; Daly, Adrian F; Beckers, Albert

    2015-12-01

    Acromegaly and pituitary gigantism are very rare conditions resulting from excessive secretion of growth hormone (GH), usually by a pituitary adenoma. Pituitary gigantism occurs when GH excess overlaps with the period of rapid linear growth during childhood and adolescence. Until recently, its etiology and clinical characteristics have been poorly understood. Genetic and genomic causes have been identified in recent years that explain about half of cases of pituitary gigantism. We describe these recent discoveries and focus on some important settings in which gigantism can occur, including familial isolated pituitary adenomas (FIPA) and the newly described X-linked acrogigantism (X-LAG) syndrome.

  15. Imaging of the pituitary and sella turcica.

    Science.gov (United States)

    Mazumdar, Avi

    2006-09-01

    The pituitary gland is housed in the sella turcica and has vital endocrinologic functions. It lies in close proximity to numerous vital structures, including the optic chiasm, sphenoid sinus, cavernous sinus and hypothalamus. An understanding of the function, anatomy and embryology of the pituitary gland and its surrounding structures is vital to understanding its normal appearance, as well as in evaluating the broad spectrum of pathology that can involve the pituitary gland. Imaging of pathology in the sellar region, including pituitary adenomas, meningiomas, craniopharyngiomas and aneurysms, plays an important role in guiding treatment decisions. Modern imaging techniques are also important in evaluating the pituitary gland after surgery.

  16. Computed tomography in pituitary abscess

    Energy Technology Data Exchange (ETDEWEB)

    Appel, W.; Scharphuis, T.; Distelmaier, P.

    1986-06-01

    This is a report on a rare case of a recurring abscess in the pituitary gland. Diagnosis was extremely difficult to establish preoperatively. This is demonstrated via various radiological methods. Anamnesis and clinical disease pattern are important assisting factors in diagnosis.

  17. Ectopic Suprasellar Thyrotropin-Secreting Pituitary Adenoma: Case Report and Literature Review.

    Science.gov (United States)

    Wang, Qing; Lu, Xiao-Jie; Sun, Jun; Wang, Jing; Huang, Ci You; Wu, Zhi Feng

    2016-11-01

    Ectopic thyroid-stimulating hormone (TSH)-secreting pituitary adenomas are rare and can often be misdiagnosed as primary hyperthyroidism. We present a case of an ectopic suprasellar TSH-secreting pituitary adenoma. A literature review of previously reported ectopic TSH-secreting and suprasellar pituitary adenomas is included to illustrate the clinical characteristics of this disease entity and the diversity of operative approaches to treating ectopic suprasellar pituitary adenomas. A 46-year-old man presented with typical clinical signs of hyperthyroidism and a history of progressive visual field impairment and vision loss. Laboratory investigations revealed that the patient had elevated levels of free thyroxine and free triiodothyronine and a normal level of TSH. Neuro-ophthalmologic examination showed right eye/left eye = 1.0/0.6 and left temporal hemianopia. Magnetic resonance imaging revealed a mass located in the suprasellar space. The patient underwent preoperative short-term octreotide treatment followed by gross total resection of the tumor via the extended endoscopic endonasal transtuberculum sellar approach. At 6-month follow-up evaluation, the patient's endocrinologic function tests met the criteria for cure, and magnetic resonance imaging revealed a normal pituitary gland and stalk with no tumor recurrence. Histologic diagnosis confirmed the presence of a TSH-secreting pituitary adenoma. To the best of our knowledge, this is the first reported case of an ectopic suprasellar TSH-secreting pituitary adenoma. Preoperative preparation and complete resection are the keys to a cure. The extended endoscopic endonasal transtuberculum sellar approach is an alternative minimally invasive method for the removal of an ectopic suprasellar pituitary adenoma. Copyright © 2016 Elsevier Inc. All rights reserved.

  18. Effects of Carbenoxolone on the Canine Pituitary-Adrenal Axis.

    Directory of Open Access Journals (Sweden)

    Takahiro Teshima

    Full Text Available Cushing's disease caused by pituitary corticotroph adenoma is a common endocrine disease in dogs. A characteristic biochemical feature of corticotroph adenomas is their relative resistance to suppressive negative feedback by glucocorticoids. The abnormal expression of 11beta-hydroxysteroid dehydrogenase (11HSD, which is a cortisol metabolic enzyme, is found in human and murine corticotroph adenomas. Our recent studies demonstrated that canine corticotroph adenomas also have abnormal expression of 11HSD. 11HSD has two isoforms in dogs, 11HSD type1 (HSD11B1, which converts cortisone into active cortisol, and 11HSD type2 (HSD11B2, which converts cortisol into inactive cortisone. It has been suggested that glucocorticoid resistance in corticotroph tumors is related to the overexpression of HSD11B2. Therefore it was our aim to investigate the effects of carbenoxolone (CBX, an 11HSD inhibitor, on the healthy dog's pituitary-adrenal axis. Dogs were administered 50 mg/kg of CBX twice each day for 15 days. During CBX administration, no adverse effects were observed in any dogs. The plasma adrenocorticotropic hormone (ACTH, and serum cortisol and cortisone concentrations were significantly lower at day 7 and 15 following corticotropin releasing hormone stimulation. After completion of CBX administration, the HSD11B1 mRNA expression was higher, and HSD11B2 mRNA expression was significantly lower in the pituitaries. Moreover, proopiomelanocortin mRNA expression was lower, and the ratio of ACTH-positive cells in the anterior pituitary was also significantly lower after CBX treatment. In adrenal glands treated with CBX, HSD11B1 and HSD11B2 mRNA expression were both lower compared to normal canine adrenal glands. The results of this study suggested that CBX inhibits ACTH secretion from pituitary due to altered 11HSD expressions, and is potentially useful for the treatment of canine Cushing's disease.

  19. Pituitary apoplexy presenting with anorexia and hyponatraemia.

    Science.gov (United States)

    Sasaki, Yosuke; Nakata, Kenji; Suzuki, Kenichi; Ando, Yasuyo

    2015-04-09

    Pituitary apoplexy, a syndrome caused by haemorrhage into the pituitary gland, typically manifests as sudden severe headache, visual symptoms and hypopituitarism, including adrenal insufficiency. We report a case of a 65-year-old man with adrenal insufficiency due to pituitary apoplexy presenting with anorexia following temporal headache and diagnosed through evaluation for hyponatraemia. MRI focusing on the pituitary gland helped to confirm the diagnosis. Our experience serves as a useful reminder of this atypical presentation of pituitary apoplexy, also known as 'subclinical pituitary apoplexy,' and underscores the importance of careful evaluation for hyponatraemia using serial urine osmolality, which is useful to distinguish hypovolaemic hyponatraemia from euvolaemic hyponatraemia. Clinicians should consider pituitary apoplexy as a differential diagnosis in cases of anorexia, loss of energy or hyponatraemia, following headache even when the patient is lacking classical symptoms such as severe headache or visual symptoms.

  20. The Shrinkage Cracking Behavior in Reinforced Reactive Powder Concrete Walls

    Directory of Open Access Journals (Sweden)

    Samir A. Al-Mashhadi

    2017-07-01

    Full Text Available In this study, the reduced scale wall models were used (they are believed to resemble as much as possible the field conditions to study the shrinkage behavior of reactive powder concrete (RPC base restrained walls. Six base restrained RPC walls were casted in different length/height ratios of two ratios of steel fiber by volume in Summer. These walls were restrained by reinforced concrete bases to provide the continuous base restraint to the walls. The mechanical properties of reactive powder concrete investigated were; compressive strength between (75.3 – 140.1 MPa, splitting tensile strength between (5.7 – 13.9 MPa, flexural tensile strength (7.7 – 24.5 MPa, and static modulus of elasticity (32.7 – 47.1GPa. Based on the observations of this work, it was found that the cracks did not develop in the reduced scale of the reactive powder concrete (RPC walls restrained from movement at their bases for different L/H ratios (2, 5, and 10 and for two ratio of steel fiber (1% & 2% during 90 days period of drying conditions. Moreover, the shrinkage values increase toward the edges. Based on the results of this work, the increase in the maximum shrinkage values of walls with 1% steel fiber were (29%, 28%, 28% of the maximum shrinkage values of walls with 2% steel fiber of length/height ratios of (2, 5, and 10 respectively. The experimental observation in beam specimens showed that the free shrinkage, tensile strain capacity and elastic tensile strain capacity (at date of cracking of beams with 1% steel fiber were higher than the beams with 2% steel fiber by about (24%, (45% and (42% respectively

  1. Cure shrinkage effects in epoxy and polycyanate matrix composites

    Energy Technology Data Exchange (ETDEWEB)

    Spellman, G.P.

    1995-12-22

    A relatively new advanced composite matrix, polycyanate ester, was evaluated for cure shrinkage. The chemical cure shrinkage of composites is difficult to model but a number of clever experimental techniques are available to the investigator. In this work the method of curing a prepreg layup on top of a previously cured laminate of identical ply composition is utilized. The polymeric matrices used in advanced composites have been primarily epoxies and therefore a common system of this type, Fiberite 3501-6, was used as a base case material. Three polycyanate matrix systems were selected for the study. These are: Fiberite 954-2A, YLA RS-3, and Bryte Technology BTCy-1. The first three of these systems were unidirectional prepreg with carbon fiber reinforcement. The Bryte Technology material was reinforced with E-glass fabric. The technique used to evaluate cure shrinkage results in distortion of the flatness of an otherwise symmetric laminate. The first laminate is cured in a conventional fashion. An identical layup is cured on this first laminate. During the second cure all constituents are exposed to the same thermal cycles. However, only the new portion of the laminate will experience volumetric changes associate with matrix cure. The additional strain of cure shrinkage results in an unsymmetric distribution of residual stresses and an associated warpage of the laminate. The baseline material, Fiberite 3501-6, exhibited cure shrinkage that was in accordance with expectations. Cure strains were {minus}4.5E-04. The YLA RS-3 material had cure strains somewhat lower at {minus}3.2E-04. The Fiberite 954-2A cure strain was {minus}1.5E-04 that is 70% lower than the baseline material. The glass fabric material with the Bryte BTCy-1 matrix did not result in meaningful results because the processing methods were not fully compatible with the material.

  2. 经鼻蝶垂体瘤切除术前两种方法训练用口呼吸对患者生命体征及心理的影响%Effect of two training Methods of mouth breathing on vital signs and psychology of patients before transsphenoidal pituitary tumor resection

    Institute of Scientific and Technical Information of China (English)

    马青华; 贾平; 廖天芬; 安莉

    2012-01-01

    目的 比较两种方法训练用口呼吸对经鼻蝶入路垂体瘤切除术患者生命体征、血氧饱和度、心理方面的影响.方法 选取经鼻蝶入路垂体瘤切除患者53例,按手术的先后顺序间断分为对照组(26例)和试验组(27例).对照组术前采取用手捏鼻的方法训练患者用口呼吸;试验组术前采用纱条填塞患者鼻腔训练患者用口呼吸.比较两组患者生命体征变化情况及患者的心理反应.结果 两组患者呼吸频率变化差异有统计学意义(P<0.05);对照组65.4%患者对纱条填塞鼻腔产生焦虑;试验组25.9%患者对纱条填塞鼻腔产生焦虑,差异有统计学意义(x2=8.32,P<0.05).结论 用纱条填塞患者鼻腔来训练患者用口呼吸的方法较传统的捏鼻方法效果佳,值得推广.%Objective To compare the effect of two training methods on the vital signs, saturation of blood oxygen, and psychology of patients undergoing transsphenoidal pituitary tumor resection. Methods Fifty-three patients undergoing transsphenoidal pituitary tumor resection were orderly assigned to the experimental group (26 cases) and the control group (27 cases). Patients in control group were trained to hold their nose and breathe by mouth. In experimental group, patients also breathed by mouth and blocked their nasal cavity with gauze. We compared the vital signs and psychic reaction of the patients in two groups. Results There were significant difference between the patients in two groups in breathing frequency (P < 0. 05). In control group,65. 4% of the patients showed anxiety due to nose blocking with gauze,and 25. 9% of the patients in experimental group showed the same problem. There was significant difference between the two groups ( P < 0. 05 ) . Conclusion Gauze leads hand in blocking nasal cavity, which is worth promoting.

  3. Successful treatment of pituitary carcinoma with concurrent radiation, temozolomide, and bevacizumab after resection.

    Science.gov (United States)

    Touma, Waseem; Hoostal, Spencer; Peterson, Richard A; Wiernik, Andres; SantaCruz, Karen S; Lou, Emil

    2017-03-11

    The optimal treatment of pituitary carcinomas (PC) is unknown. Treatment includes surgical resection, radiation, and more recently, temozolomide (TMZ). Pituitary adenomas have relatively high expression of vascular endothelial growth factor; therefore, bevacizumab, an antiangiogenic agent, has been used in a small number of aggressive or malignant pituitary tumors after recurrence. However, it has not been administered concurrently with other chemotherapeutic agents or combined with radiation therapy in PC. We present a 63-year-old man with an adrenocorticotropic hormone (ACTH)-secreting PC, causing visual loss. It was resected transsphenoidally. There were several notable factors placing the patient at high risk for recurrence including distant metastasis in the form of a pulmonary nodule. Morphologically, his tumor was a pituitary neoplasm with malignant histopathologic features. It had abundant mitotic figures and zones of necrosis. Six weeks post-surgery, the patient started concurrent chemoradiation, using combination therapy with TMZ and bevacizumab. TMZ was continued for 12 cycles in the adjuvant setting. The ACTH was effective as a serum-based tumor marker and normalized during treatment. The patient is alive, five years after diagnosis, with no recurrence to date. This is the first case of pituitary carcinoma treated successfully with concurrent chemoradiation therapy that combined TMZ and bevacizumab with a long-term follow up.

  4. The incidentaloma of the pituitary gland: Is neurosurgery required

    Energy Technology Data Exchange (ETDEWEB)

    Reincke, M.; Allolio, B.; Saeger, W.; Menzel, J.; Winkelmann, W. (Univ. of Cologne (West Germany))

    1990-05-23

    The authors describe a series of 18 patients with an intrasellar mass incidentally discovered by computed tomography or magnetic resonance imaging. The average size of the mass was 13 mm, with a range from 5 to 25 mm. Initial ophthalmologic examination revealed bitemporal hemianopia in 2 patients. Results of routine endocrine testing showed partial hypopituitarism in 5 patients and growth hormone hypersecretion without signs and symptoms of acromegaly in 1 patient. Four patients underwent neurosurgery. Histologically, one chondroid chordoma and three pituitary adenomas were found. In the remaining 14 patients treated conservatively, repeated computed tomography and magnetic resonance imaging revealed no significant change in tumor size at the time of follow-up. The results suggest that the incidentaloma of the pituitary gland is a benign condition that does not necessarily require neurosurgical intervention.

  5. Hypothalamic pituitary disorders expressed by galactorrhea. A dynamic evaluation.

    Science.gov (United States)

    Perez-Lopez, F R

    1975-11-01

    Physiologic and pathologic production of milk involves complex relations between the mammary glands, hormones, and the central nervous system. In all the galactorrhea syndromes there is a functional or mechanical problem at the pituitary level, with abnormal secretion or reserve of prolactin secretion. Stimulatory agents of prolactin, like thyrotropin releasing hormone (TRH), chlorpromazine, amnio acids, and insulin, can be helpful in the study of the hypothalamic pituitary functional reserve, while the osmotic tests seem to provide a clear distinction between functional and tumoral causes. The inhibitory agents of prolactin secretion, L-dopa and CB 154, permit the study of the negative control of the hormone. In addition, CB 154 appears to be an effective treatment for functional galactorrhea. Hyperprolactinemia appears to exert an inhibitory influence on gonadotropins. Clomiphene, acting on the hypothalamus, and LHRH, acting on the gonadotropes, permit the assessment of the gonadotropic hypothalamic-hypophyseal axis.

  6. Photon spectrum and absorbed dose in brain tumor

    Energy Technology Data Exchange (ETDEWEB)

    Silva S, A. [General Electric Healthcare, Antonio Dovali Jaime 70, Torre A 3er. piso, Col. Santa Fe, 01210 Mexico D. F. (Mexico); Vega C, H. R. [Universidad Autonoma de Zacatecas, Unidad Academica de Estudios Nucleares, Cipres No. 10, Fracc. La Penuela, 98068 Zacatecas, Zac. (Mexico); Rivera M, T. [IPN, Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada, Av. Legaria No. 694, 11500 Mexico D. F. (Mexico)

    2015-10-15

    Using Monte Carlo methods a BOMAB phantom inside a treatment hall with a brain tumor nearby the pituitary gland was treated with photons produced by a Varian 6 MV linac. The photon spectrum and the absorbed dose were calculated in the tumor, pituitary gland and the head. The treatment beam was collimated to illuminate only the tumor volume; however photons were noticed in the gland. Photon fluence reaching the tumor is 78.1 times larger than the fluence in the pituitary gland, on the other hand the absorbed dose in the tumor is 188 times larger than the dose in the gland because photons that reach the pituitary gland are scattered, by the head and the tumor, through Compton effect. (Author)

  7. Long-term outcomes of surgery and radiotherapy for secreting and non-secreting pituitary adenoma

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Mi Young; Kim, Jin Hee; Oh, Young Kee; Kim, El [Dongsan Medical Center, Keimyung University School of Medicine, Daegu (Korea, Republic of)

    2016-06-15

    To investigate treatment outcome and long term complication after surgery and radiotherapy (RT) for pituitary adenoma. From 1990 to 2009, 73 patients with surgery and RT for pituitary adenoma were analyzed in this study. Median age was 51 years (range, 25 to 71 years). Median tumor size was 3 cm (range, 1 to 5 cm) with suprasellar (n = 21), cavernous sinus extension (n = 14) or both (n = 5). Hormone secreting tumor was diagnosed in 29 patients; 16 patients with prolactin, 12 patients with growth hormone, and 1 patient with adrenocorticotrophic hormone. Impairment of visual acuity or visual field was presented in 33 patients at first diagnosis. Most patients (n = 64) received RT as postoperative adjuvant setting. Median RT dose was 45 Gy (range, 45 to 59.4 Gy). Median follow-up duration was 8 years (range, 3 to 22 years). In secreting tumors, hormone normalization rate was 55% (16 of 29 patients). For 25 patients with evaluable visual field and visual acuity test, 21 patients (84%) showed improvement of visual disturbance after treatment. The 10-year tumor control rate for non-secreting and secreting adenoma was 100% and 58%, respectively (p < 0.001). Progression free survival rate at 10 years was 98%. Only 1 patient experienced endocrinological recurrence. Following surgery, 60% (n = 44) suffered from pituitary function deficit. Late complication associated with RT was only 1 patient, who developed cataract. Surgery and RT are very effective and safe in hormonal and tumor growth control for secreting and non-secreting pituitary adenoma.

  8. Etiology of hypopituitarism in tertiary care institutions in Turkish population: analysis of 773 patients from Pituitary Study Group database.

    Science.gov (United States)

    Tanriverdi, F; Dokmetas, H S; Kebapcı, N; Kilicli, F; Atmaca, H; Yarman, S; Ertorer, M E; Erturk, E; Bayram, F; Tugrul, A; Culha, C; Cakir, M; Mert, M; Aydin, H; Taskale, M; Ersoz, N; Canturk, Z; Anaforoglu, I; Ozkaya, M; Oruk, G; Hekimsoy, Z; Kelestimur, F; Erbas, T

    2014-09-01

    Hypopituitarism in adult life is commonly acquired and the main causes are known as pituitary tumors and/or their treatments. Since there are new insights into the etiology of hypopituitarism and presence of differences in various populations, more studies regarding causes of hypopituitarism are needed to be done in different ethnic groups with sufficient number of patients. Therefore, we performed a multi-center database study in Turkish population investigating the etiology of hypopituitarism in 773 patients in tertiary care institutions. The study was designed and coordinated by the Pituitary Study Group of SEMT (The Society of Endocrinology and Metabolism of Turkey). Nineteen tertiary reference centers (14 university hospitals and 5 training hospitals) from the different regions of Turkey participated in the study. It is a cross-sectional database study, and the data were recorded for 18 months. We mainly classified the causes of hypopituitarism as pituitary tumors (due to direct effects of the pituitary tumors and/or their treatments), extra-pituitary tumors and non-tumoral causes. Mean age of 773 patients (49.8 % male, 50.2 % female) was 43.9 ± 16.1 years (range 16-84 years). The most common etiology of pituitary dysfunction was due to non-tumoral causes (49.2 %) among all patients. However, when we analyze the causes according to gender, the most common etiology in males was pituitary tumors, but the most common etiology in females was non-tumoral causes. According to the subgroup analysis of the causes of hypopituitarism in all patients, the most common four causes of hypopituitarism which have frequencies over 10 % were as follows: non-secretory pituitary adenomas, Sheehan's syndrome, lactotroph adenomas and idiopathic. With regard to the type of hormonal deficiencies; FSH/LH deficiency was the most common hormonal deficit (84.9 % of the patients). In 33.8 % of the patients, 4 anterior pituitary hormone deficiencies (FSH/LH, ACTH, TSH, and GH) were

  9. Study of ‘real’ shrinkage by ESEM observations and digital image analysis

    NARCIS (Netherlands)

    Jankovic, D.

    2007-01-01

    Defining the 'real' shrinkage values of concrete is still a subject of much debate. In shrinkage experiments size effects are inherently present. Through an attempt to determine the real shrinkage of cement-based materials, these size effects have to be eliminated or at least reduced as much a possi

  10. [Comparative study of polymerization shrinkage and related properties of flowable composites and an unfilled resin].

    Science.gov (United States)

    Bukovinszky, Katalin; Molnár, Lilla; Bakó, József; Szalóki, Melinda; Hegedus, Csaba

    2014-03-01

    The polymerization shrinkage and shrinkage stress of dental composites are in the center of the interest of researchers and manufacturers. It is a great challenge to minimize this important property as low as possible. Many factors are related and are in complicated correlation with each other affecting the polymerization shrinkage. Polymerization shrinkage stress degree of conversion and elasticity has high importance from this aspect. Our aim was to study the polymerization shrinkage and related properties (modulus of elasticity, degree of conversion, shrinkage stress) of three flowable composite (Charisma Opal Flow, SDR, Filtek Ultimate) and an unfilled composite resin. Modulus of elasticity was measured using three point flexure tests on universal testing machine. The polymerization shrinkage stress was determined using bonded-disc technique. The degree of conversion measurements were performed by FT-IR spectroscopy. And the volumetric shrinkage was investigated using Archimedes principle and was measured on analytical balance with special additional equipment. The unfilled resin generally showed higher shrinkage (8,26%), shrinkage stress (0,8 MPa) and degree of conversion (38%), and presented the lowest modulus of elasticity (3047,02MPa). Highest values of unfilled resin correspond to the literature. The lack of fillers enlarges the shrinkage, and the shrinkage stress, but gives the higher flexibility and higher degree of conversion. Further investigations needs to be done to understand and reveal the differences between the composites.

  11. A Monte Carlo Evaluation of Estimated Parameters of Five Shrinkage Estimate Formuli.

    Science.gov (United States)

    Newman, Isadore; And Others

    1979-01-01

    A Monte Carlo simulation was employed to determine the accuracy with which the shrinkage in R squared can be estimated by five different shrinkage formulas. The study dealt with the use of shrinkage formulas for various sample sizes, different R squared values, and different degrees of multicollinearity. (Author/JKS)

  12. Clinical results of stereotactic hellium-ion radiosurgery of the pituitary gland at Lawrence Berkeley Laboratory

    Energy Technology Data Exchange (ETDEWEB)

    Levy, R.P.; Fabrikant, J.I.; Lyman, J.T.; Frankel, K.A.; Phillips, M.H.; Lawrence, J.H.; Tobias, C.A.

    1989-12-01

    The first therapeutic clinical trial using accelerated heavy-charged particles in humans was performed at Lawrence Berkeley Laboratory (LBL) for the treatment of various endocrine and metabolic disorders of the pituitary gland, and as suppressive therapy for adenohypophyseal hormone-responsive carcinomas and diabetic retinopathy. In acromegaly, Cushing's disease, Nelson's syndrome and prolactin-secreting tumors, the therapeutic goal in the 433 patients treated has been to destroy or inhibit the growth of the pituitary tumor and control hormonal hypersecretion, while preserving a functional rim of tissue with normal hormone-secreting capacity, and minimizing neurologic injury. An additional group of 34 patients was treated for nonsecreting chromophobe adenomas. This paper discusses the methods and results of stereotactic helium-ion radiosurgery of the pituitary gland at Lawrence Berkeley Laboratory. 11 refs.

  13. Clinical results of stereotactic helium-ion radiosurgery of the pituitary gland at Lawrence Berkeley Laboratory

    Energy Technology Data Exchange (ETDEWEB)

    Levy, R.P.; Fabrikant, J.I.; Lyman, J.T.; Frankel, K.A.; Phillips, M.H.; Lawrence, J.H.; Tobias, C.A.

    1989-12-01

    The first therapeutic clinical trial using accelerated heavy-charged particles in humans was performed for the treatment of various endocrine and metabolic disorders of the pituitary gland, and as suppressive therapy for adenohypophyseal hormone-responsive carcinomas and diabetic retinopathy. Since then, over 800 patients have received stereotactically-directed plateau-beam heavy-charged particle pituitary irradiation at this institution. In acromegaly, Cushing's disease, Nelson's syndrome and prolactin-secreting tumors, the therapeutic goal in the 433 patients treated has been to destroy or inhibit the growth of the pituitary tumor and control hormonal hypersecretion, while preserving a functional rim of tissue with normal hormone-secreting capacity, and minimizing neurologic injury. An additional group of 34 patients was treated for nonsecreting chromophobe adenomas. This paper discusses the methods and results of these treatments. 11 refs.

  14. Gamma Knife radiosurgery in pituitary adenomas: Why, who, and how to treat?

    Science.gov (United States)

    Castinetti, Frederic; Brue, Thierry

    2010-08-01

    Pituitary adenomas are benign tumors that can be either secreting (acromegaly, Cushing's disease, prolactinomas) or non-secreting. Transsphenoidal neurosurgery is the gold standard treatment; however, it is not always effective. Gamma Knife radiosurgery is a specific modality of stereotactic radiosurgery, a precise radiation technique. Several studies reported the efficacy and low risk of adverse effects induced by this technique: in secreting pituitary adenomas, hypersecretion is controlled in about 50% of cases and tumor volume is stabilized or decreased in 80-90% of cases, making Gamma Knife a valuable adjunctive or first-line treatment. As hormone levels decrease progressively, the main drawback is the longer time to remission (12-60 months), requiring an additional treatment during this period. Hypopituitarism is the main side effect, observed in 20-40% cases. Gamma Knife is thus useful in the therapeutic algorithms of pituitary adenomas in well-defined indications, mainly low secreting small lesions well identified on magnetic resonance imaging (MRI).

  15. A primary sellar neuroblastoma mimicking a pituitary adenoma: A case report

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Dong Gun; Heo, Young Jin; Kim, Eun Kyoung; Baek, Jin Wook; Jeong, Hae Woong; Jung, Hyun Seok [Busan Paik Hospital, Inje University College of Medicine, Busan (Korea, Republic of)

    2016-12-15

    Intracranial neuroblastomas are uncommon malignant tumors that usually arise in the supratentorial parenchymal or paraventricular location. A primary neuroblastoma arising in the sella turcica is extremely rare. We report a case of a 76-year-old man who presented with progressive bitemporal hemianopsia. His pituitary hormone levels were within the normal range, except for slightly increased prolactin. Pituitary magnetic resonance imaging revealed a solitary sellar mass with supra- and parasellar extension that mimicked a non-functioning pituitary adenoma or meningioma. The tumor was excised by transsphenoidal resection. Histopathologic analysis revealed small cells surrounded by a dense fibrillary stroma as well as strong expression of neural markers. Hence, the patient was diagnosed with sellar neuroblastoma. Prolactin levels normalized in the immediate postoperative period, although visual disturbances persisted. Herein, we describe the clinical manifestations, MRI characteristics, and histopathologic findings of this case.

  16. The Expression of Integrinβ1 and FAK in Pituitary Adenomas and Their Correlation with Invasiveness

    Institute of Scientific and Technical Information of China (English)

    Feng WAN; Kai SHU; Ting LEI; Delin XUE

    2008-01-01

    Summary: The expression and possible role of integrin-focal adhesion kinase signal pathway in invasive pituitary adenomas were explored. Forty-nine human pituitary adenomas were detected for the expression of integrinβ1 (INTβ1) and focal adhesion kinase (FAK) by immunohistochemistry, and their correlation with the invasiveness of pituitary adenomas as well as between themselves was analyzed. The results showed that INTβ1 was expressed in 46 cases (93.9%) and FAK in 36 cases (73.5%), respectively, and their expression levels were highly correlated with tumor invasiveness, but not with the tumor types. It was suggested that the integrin-focal adhesion kinase signal pathway plays a role in the invasiveness of pituitary adenomas.

  17. New particle growth and shrinkage observed in subtropical environments

    Directory of Open Access Journals (Sweden)

    L.-H. Young

    2012-07-01

    Full Text Available We present the first systematic analysis for new particle formation (NPF, growth and shrinkage of new particles observed at four different sites in subtropical Central Taiwan. A total of 14 NPF events were identified during 137 days of ambient measurements during a cold and warm season. The derived nucleation rates of 1 nm particles (J1 and growth rates were in the range of 39.6–252.9 cm−3 s−1 and 6.5–14.5 nm h−1, respectively. The NPF events occurred on days either with low condensation sink (CS, increased morning traffic emissions and the breakup of nocturnal inversion layer (type A, or with high CS, minimum levels of primary traffic emissions and enhanced atmospheric dilution (type B. On non-event days, the particle number concentrations were mostly driven by traffic emissions. We have also observed shrinkage of new particles (type A-S and B-S, reversal of growth, during five out of the 14 NPF events. In intense shrinkage cases, the grown particles shrank back to the smallest measurable size of ~10 nm, thereby creating a unique "arch-like" shape in the size distribution contour plot. The particle shrinkage rates ranged from 5.1 to 7.6 nm h−1. The ratios of shrinkage-to-growth rates were mostly in the range of 0.40–0.65, suggesting that a large fraction of the condensable species that contributed to growth were likely semi-volatile. The particle shrinkage was related to air masses with low CS due to atmospheric dilution, high ambient temperature and low relative humidity and such atmospheric conditions may have facilitated the evaporation of semi-volatile species from the particles to the gas phase. Our observations show that the new particle growth may be a~reversible process and the evaporating semi-volatile species are important for the growth of new particles to cloud condensation nuclei sizes.

  18. Relative sparing of anterior pituitary function in patients with growth hormone-secreting macroadenomas: comparison with nonfunctioning macroadenomas.

    Science.gov (United States)

    Greenman, Y; Tordjman, K; Kisch, E; Razon, N; Ouaknine, G; Stern, N

    1995-05-01

    Pre- and postoperative anterior pituitary function was assessed in 26 subjects with nonfunctioning macroadenoma (NFMA) and in 15 acromegalic subjects with macroadenomas. Preoperatively, NFMA patients had a higher prevalence of secondary hypogonadism (78% vs. 40%; P < 0.05), hypothyroidism (23% vs. 0%; P = 0.06), and hypoadrenalism (43% vs. 7%; P = 0.02) compared to individuals with GH-secreting macroadenoma (GHMA). Patients with NFMA also had a higher prevalence of more severe pituitary failure compared with acromegalic patients; 56% of the patients in this group had more than one pituitary hormone axis impaired compared to only 8% in the acromegalic group. These differences could not be accounted for by tumor grade and/or stage. Transsphenoidal pituitary surgery led to a significant improvement in anterior pituitary function in the NFMA group. Nevertheless, the prevalence of pituitary deficiency postoperatively was still significantly greater in NFMA patients than in the acromegalic group (68% vs. 17%, respectively; P < 0.04). The results suggest that anterior pituitary function is better preserved in GHMA than in NFMA and that this difference is independent of tumor size. The mechanism underlying the lower rate of hypopituitarism in acromegalics with macroadenomas remains to be elucidated.

  19. Camalexin-Induced Cell Membrane Scrambling and Cell Shrinkage in Human Erythrocytes

    Directory of Open Access Journals (Sweden)

    Mustafa Almasry

    2017-02-01

    Full Text Available Background/Aims: The thaliana phytoalexin Camalexin has been proposed for the treatment of malignancy. Camalexin counteracts tumor growth in part by stimulation of suicidal death or apoptosis of tumor cells. Similar to apoptosis of nucleated cells, erythrocytes may enter suicidal death or eryptosis, which is characterized by cell shrinkage and cell membrane scrambling with phosphatidylserine translocation to the erythrocyte surface. Cellular mechanisms contributing to the complex machinery executing eryptosis include increase of cytosolic Ca2+ activity ([Ca2+]i, oxidative stress, ceramide, protein kinase C and caspases. The present study explored, whether Camalexin induces eryptosis and, if so, to shed light on mechanisms involved. Methods: Phosphatidylserine exposure at the cell surface was estimated from annexin-V-binding, cell volume from forward scatter, [Ca2+]i from Fluo-3 fluorescence, ROS formation from DCFDA dependent fluorescence, and ceramide abundance utilizing specific antibodies. Results: A 48 hours exposure of human erythrocytes to Camalexin significantly increased the percentage of annexin-V-binding cells (≥ 10 µg/ml, significantly decreased forward scatter (≥ 5 µg/ml and significantly increased Fluo-3-fluorescence (≥ 10 µg/ml, but did not significantly modify DCFDA fluorescence or ceramide abundance. The effect of Camalexin on annexin-V-binding was significantly blunted by removal of extracellular Ca2+, by kinase inhibitors staurosporine (1 µM and chelerythrine (10 µM, as well as by caspase inhibitors zVAD (10 µM and zIETD-fmk (50 µM. Conclusions: Camalexin triggers cell shrinkage and phospholipid scrambling of the erythrocyte cell membrane, an effect at least in part depending on Ca2+ entry, as well as staurosporine and chelerythrine sensitive kinase(s as well as zVAD and zIETD-fmk sensitive caspase(s.

  20. Computed tomography of pituitary microadenoma

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Kyung-Il; Katto, Keiichi; Tanaka, Teruhiko; Kosaka, Shiro; Kaimori, Mitsuhiro (Aomori Prefectural Central Hospital (Japan))

    1983-08-01

    Thirteen pituitary microadenomas detected by Delta Scan 2020 are presented, and their CT findings are analyzed in points of size, shape, limit, density and contrast enhancement. All are demonstrated as a round, well defined and homogeneous mass, and are enhanced by contrast medium. The average size is 6.2 by 7.6 mm in diameter. Two of them are prolactinoma, and are treated by Bromocriptine. The prolactinomas vanished on CT scan, 6 months after administration of Bromocriptine. Eleven of them are nonfunctioning. Five are operated and the others are followed by CT scan. In detection of pituitary microadenoma, overlapping scanning with thin-slice is necessary and coronal scanning is often helpful. The adenoma greater than 5 mm in diameter may be detectable.

  1. The FGFR4-G388R Polymorphism Promotes Mitochondrial STAT3 Serine Phosphorylation to Facilitate Pituitary Growth Hormone Cell Tumorigenesis

    OpenAIRE

    Toru Tateno; Asa, Sylvia L.; Lei Zheng; Thomas Mayr; Axel Ullrich; Shereen Ezzat

    2011-01-01

    Pituitary tumors are common intracranial neoplasms, yet few germline abnormalities have been implicated in their pathogenesis. Here we show that a single nucleotide germline polymorphism (SNP) substituting an arginine (R) for glycine (G) in the FGFR4 transmembrane domain can alter pituitary cell growth and hormone production. Compared with FGFR4-G388 mammosomatotroph cells that support prolactin (PRL) production, FGFR4-R388 cells express predominantly growth hormone (GH). Growth promoting eff...

  2. The use of intraoperative computed tomography navigation in pituitary surgery promises a better intraoperative orientation in special cases

    OpenAIRE

    Stefan Linsler; Sebastian Antes; Sebastian Senger; Joachim Oertel

    2016-01-01

    Objective: The safety of endoscopic skull base surgery can be enhanced by accurate navigation in preoperative computed tomography (CT) and magnetic resonance imaging (MRI). Here, we report our initial experience of real-time intraoperative CT-guided navigation surgery for pituitary tumors in childhood. Materials and Methods: We report the case of a 15-year-old girl with a huge growth hormone-secreting pituitary adenoma with supra- and perisellar extension. Furthermore, the skull base was infi...

  3. Management of nonfunctioning pituitary incidentaloma.

    Science.gov (United States)

    Galland, Françoise; Vantyghem, Marie-Christine; Cazabat, Laure; Boulin, Anne; Cotton, François; Bonneville, Jean-François; Jouanneau, Emmanuel; Vidal-Trécan, Gwénaelle; Chanson, Philippe

    2015-07-01

    Prevalence of pituitary incidentaloma is variable: between 1.4% and 27% at autopsy, and between 3.7% and 37% on imaging. Pituitary microincidentalomas (serendipitously discovered adenoma 1cm in diameter) show increased size in 20-24% and 34-40% of cases at respectively 4 and 8years' follow-up. Radiologic differential diagnosis requires MRI centered on the pituitary gland. Initial assessment of nonfunctioning (NF) microincidentaloma is firstly clinical, the endocrinologist looking for signs of hypersecretion (signs of hyperprolactinemia, acromegaly or Cushing's syndrome), followed up by systematic prolactin and IGF-1 assay. Initial assessment of NF macroincidentaloma is clinical, the endocrinologist looking for signs of hormonal hypersecretion or hypopituitarism, followed up by hormonal assay to screen for hypersecretion or hormonal deficiency and by ophthalmologic assessment (visual acuity and visual field) if and only if the lesion is near the optic chiasm (OC). NF microincidentaloma of less than 5mm requires no surveillance; those of≥5mm are not operated on but rather monitored on MRI at 6months and then 2years. Macroincidentaloma remote from the OC is monitored on MRI at 1year, with hormonal exploration (for anterior pituitary deficiency), then every 2years. When macroincidentaloma located near the OC is managed by surveillance rather than surgery, MRI is recommended at 6months, with hormonal and visual exploration, then annual MRI and hormonal and visual assessment every 6months. Surgery is indicated in the following cases: evolutive NF microincidentaloma, NF macroincidentaloma associated with hypopituitarism or showing progression, incidentaloma compressing the OC, possible malignancy, non-compliant patient, pregnancy desired in the short-term, or context at risk of apoplexy.

  4. LINAC-radiosurgery for nonsecreting pituitary adenomas. Long-term results

    Energy Technology Data Exchange (ETDEWEB)

    Runge, M.J.R.; Maarouf, M.; Hunsche, S.; Ruge, M.I.; El Majdoub, F.; Treuer, H.; Sturm, V. [Koeln Univ. (Germany). Dept. of Stereotaxy and Functional Neurosurgery; Kocher, M.; Mueller, R.P. [Koeln Univ. (Germany). Dept. of Radiation Oncology; Voges, J. [Magdeburg Univ. (Germany). Dept. of Stereotactic Neurosurgery

    2012-04-15

    Stereotactic linear accelerator-based radiosurgery (LINAC-RS) is increasingly used for microsurgically inaccessible or recurrent pituitary adenomas. This single-center study evaluates the long-term follow-up after LINAC-RS of nonsecreting pituitary adenomas (NSA). Patients and methods: Between 1992 and August 2008, 65 patients with NSA were treated. Patient treatment and follow-up were conducted according to a prospective protocol. Indications for LINAC-RS were (1) tumor recurrence or (2) residual tumor. Three patients were treated primarily. For analysis of prognostic factors, patients were grouped according to epidemiological or treatment-associated characteristics. Results: A total of 61 patients with a follow-up {>=} 12 months (median 83 months, range 15-186 months, longest follow-up of published radiosurgery series) were evaluated with regard to their clinical, radiological, and endocrinological course. The median tumor volume was 3.5 ml ({+-} 4.3 ml, range 0.3-17.3 ml) treated with a median surface and maximum dose of 13.0 Gy and 29.7 Gy, respectively. Local tumor control was achieved in 98%. One patient died of unrelated cause after 36 months and 1 patient developed a radiation-induced seizure disorder. Visual complications did not occur. In 37 of 41 patients (90.2%), pituitary function remained stable. Maximum dose to the pituitary {<=} 16 Gy and female gender were positive prognostic factors for the preservation of pituitary function. Conclusion: LINAC-RS is a minimally invasive, safe, and effective treatment for recurrent NSA or microsurgically inaccessible residual tumor. LINAC-RS yielded a high rate of local long-term tumor control with a small number of radiation-induced side effects. (orig.)

  5. Modelling of elastoplastic damage in concrete due to desiccation shrinkage

    Science.gov (United States)

    Bourgeois, F.; Burlion, N.; Shao, J. F.

    2002-07-01

    We present a numerical modelling of elastoplastic damage due to drying shrinkage of concrete in the framework of mechanics of partially saturated porous media. An elastoplastic model coupled with isotropic damage is first formulated. Two plastic flow mechanisms are involved, controlled by applied stress and suction, respectively. A general concept of net effective stress is used in take into account effects of capillary pressure and material damage on stress-controlled plastic deformation. Damage evolution depends both on elastic and plastic strains. The model's parameters are determined or chosen from relevant experimental data. Comparisons between numerical simulations and experimental data are presented to show the capacity of model to reproduce mains features of concrete behaviour under mechanical loading and during drying shrinkage of concrete. An example of application concerning drying of a concrete wall is finally presented. The results obtained allow to show potential capacity of proposed model for numerical modelling of complex coupling processes in concrete structures.

  6. New System of Shrinkage Measurement through Cement Mortars Drying

    Science.gov (United States)

    Morón, Carlos; Saiz, Pablo; Ferrández, Daniel; García-Fuentevilla, Luisa

    2017-01-01

    Cement mortar is used as a conglomerate in the majority of construction work. There are multiple variants of cement according to the type of aggregate used in its fabrication. One of the major problems that occurs while working with this type of material is the excessive loss of moisture during cement hydration (setting and hardening), known as shrinkage, which provokes a great number of construction pathologies that are difficult to repair. In this way, the design of a new sensor able to measure the moisture loss of mortars at different age levels is useful to establish long-term predictions concerning mortar mass volume loss. The purpose of this research is the design and fabrication of a new capacitive sensor able to measure the moisture of mortars and to relate it with the shrinkage. PMID:28272297

  7. Shrinkage and trajectory of the flat jet with inclination angle

    Institute of Scientific and Technical Information of China (English)

    Shufeng Ye; Yusheng Xie; Hongzhi Guo; Ye Huang; Shantong Jin

    2003-01-01

    The performance of the flat jet with an inclination angle was investigated by a water model. A mathematical model for theshrinkage and the trajectory of the flat jet with an inclination angle was derived theoretically and verified by experimental data of thewater model. The experimental results indicate that the inclination angle (α) has no influence on the shrinkage of the flat jet, theshrinkage of the flat jet along the width direction decreases with the increasing of the initial velocity at the exit (u0) and the initialthickness of the flat jet (t0). Enough bigger initial exit velocity (u0) and initial thickness can suppress the shrinkage of the flat jetalong the width direction and keep the flat jet stabilized. In addition, the trajectory of the flat jet with an inclination angle is parabolicand must be taking into consideration when to determine the striking distance.

  8. Analysis of Shrinkage on Thick Plate Part using Genetic Algorithm

    Directory of Open Access Journals (Sweden)

    Najihah S.N.

    2016-01-01

    Full Text Available Injection moulding is the most widely used processes in manufacturing plastic products. Since the quality of injection improves plastic parts are mostly influenced by process conditions, the method to determine the optimum process conditions becomes the key to improving the part quality. This paper presents a systematic methodology to analyse the shrinkage of the thick plate part during the injection moulding process. Genetic Algorithm (GA method was proposed to optimise the process parameters that would result in optimal solutions of optimisation goals. Using the GA, the shrinkage of the thick plate part was improved by 39.1% in parallel direction and 17.21% in the normal direction of melt flow.

  9. Reversible cerebral shrinkage in kwashiorkor: an MRI study.

    Science.gov (United States)

    Gunston, G D; Burkimsher, D; Malan, H; Sive, A A

    1992-08-01

    Protein energy malnutrition is associated with cerebral atrophy which may be detrimental to intellectual development. The aim of this study was to document the anatomical abnormalities which lead to the appearance of cerebral atrophy using magnetic resonance imaging (MRI) in the acute stage of kwashiorkor and to monitor changes during nutritional rehabilitation. Twelve children aged 6 to 37 months requiring admission to hospital for the treatment of kwashiorkor were studied. The children were evaluated clinically, biochemically, and by MRI of their brains on admission and 30 and 90 days later. Brain shrinkage was present in every child on admission. White and grey matter appeared equally affected and the myelination was normal for age. At 90 days, the cerebral changes had resolved in nine and improved substantially in the remainder, by which time serum proteins and weight for age were within the normal range. The findings of this study suggest that brain shrinkage associated with kwashiorkor reverses rapidly with nutritional rehabilitation.

  10. Combinatorial Selection and Least Absolute Shrinkage via the CLASH Algorithm

    CERN Document Server

    Kyrillidis, Anastasios

    2012-01-01

    The least absolute shrinkage and selection operator (LASSO) for linear regression exploits the geometric interplay of the $\\ell_2$-data error objective and the $\\ell_1$-norm constraint to arbitrarily select sparse models. Guiding this uninformed selection process with sparsity models has been precisely the center of attention over the last decade in order to improve learning performance. To this end, we alter the selection process of LASSO to explicitly leverage combinatorial sparsity models (CSMs) via the combinatorial selection and least absolute shrinkage (CLASH) operator. We provide concrete guidelines how to leverage combinatorial constraints within CLASH, and characterize CLASH's guarantees as a function of the set restricted isometry constants of the sensing matrix. Finally, our experimental results show that CLASH can outperform both LASSO and model-based compressive sensing in sparse estimation.

  11. Autogenous Shrinkage of High Strength Lightweight Aggregate Concrete

    Institute of Scientific and Technical Information of China (English)

    DING Qingjun; TIAN Yaogang; WANG Fazhou; ZHANG Feng; HU Shuguang

    2005-01-01

    The characteristic of autogenous shrinkage ( AS ) and its effect on high strength lightweight aggregate concrete (HSLAC) were studied. The experimental results show that the main shrinkage of high strength concrete is AS and the amount of cement can affect the AS of HSLAC remarkably. At the early stage the AS of HSLAC is lower than that of high strength normal concrete, but it has a large growth at the later stage. The AS of high strength normal concrete becomes stable at 90d age, but HSLAC still has a high AS growth. It is found that adjusting the volume rate of lightweight aggregate, mixing with a proper dosage of fly ash and raising the water saturation degree of lightweight aggregate can markedly reduce the AS rate of HSLAC.

  12. The Neuro Imaging Description of Giant Pituitary Adenomas Depending on Mechanical Factor

    Directory of Open Access Journals (Sweden)

    Yu.M. Urmanova

    2016-08-01

    Full Text Available The research aim is to analyze of magnetically-resonance tomography data depending on the mechanical factor of giant pituitary adenomas. Materials and methods. Twenty-two adult patients with giant pituitary adenomas were observed during the period from 2015 to 2016 (men 50 %, aged 48.5 years old. The duration of disease varied from 2 months to 25 years. Results. Patients with endo-suprasellar growth of pituitary tumour had signs of chiasmal syndrome with bitemporal hemianopsia, initial or complete homonym hemianopsia, scotomas and others. Such variant of pituitary tumour growth was observed in 7 cases (31.8 %. 4.5 % patients with retro-sellar growth of pituitary tumour typically had violations caused by the growth of tumour into brainstem, that stipulated both the lesion of craniocerebral nerves and vegetative disorders, and also pyramid symptomatology (pathological reflexes, symptoms of oral automatism. Patients with the endo-laterosellar growth of tumour suffered from decline of sharpness of sight on one eye, one-sided headaches, lesion of oculomotorius. For 4.5 % patients with the endo-infrasellar growth of tumour violations of the nasal breathing and swallowing (odynophagia were typical. Conclusions. The most expressed neuroendocrine, ophthalmology and pillar disorders were observed in patients with the total growth of tumor. The giant pituitary adenomas are often accompanied by an invasion growth into surrounding anatomic structures (69.2 % that is a basic factor limiting radical operative intervention and increasing the number of relapses.

  13. Matrix metalloproteinase-9 and -2 and tissue inhibitor of matrix metalloproteinase-2 in invasive pituitary adenomas

    Science.gov (United States)

    Liu, Hong-Yan; Gu, Wei-Jun; Wang, Cheng-Zhi; Ji, Xiao-Jian; Mu, Yi-Ming

    2016-01-01

    Abstract The extracellular matrix is important for tumor invasion and metastasis. Normal function of the extracellular matrix depends on the balance between matrix metalloproteinases (MMPs) and tissue inhibitors of metalloproteinases (TIMPs). The objective of this meta-analysis was to assess the relationship between expression of MMP-9, MMP-2, and TIMP-2 and invasion of pituitary adenomas. We searched Pubmed, Embase, and the Chinese Biomedical Database up to October 2015. RevMan 5.1 software (Cochrane Collaboration, Copenhagen, Denmark) was used for statistical analysis. We calculated the standardized mean difference (SMD) for data expressed as mean ± standard deviation because of the difference in the detection method. Twenty-four studies (1320 patients) were included. MMP-9 expression was higher in the patients with invasive pituitary adenomas (IPAs) than patients with noninvasive pituitary adenomas (NIPAs) with detection methods of IHC [odds ratio (OR) = 5.48, 95% confidence interval (CI) = 2.61–11.50, P prolactinomas and nonfunctioning pituitary adenomas was also no difference (OR = 1.03, 95% CI = 0.48–2.20, P = 0.95). The results indicated that MMP-9 and -2 may be correlated with invasiveness of pituitary adenomas, although their relationship with functional status of pituitary adenomas is still not clear. TIMP-2 expression in IPAs needs to be investigated further. PMID:27310993

  14. Research and Application of the Mathematic Model for the Washing Shrinkage of Woven Fabric

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    Having analyzed the relationships between washing shrinkage and weaving technique, parameters, material properties of woven fabrics and studied the shrinkage mechanism and its mathematical model of the plain fabric,researchers set up a shrinkage model of the twills and satins and proposed a method for calculating the washing shrinkage based on weaving technique and parameters of fabrics. Shrinkage experiments of silk habotai, silk twill and silk satin fabrics were performed. The results were compared with those of the theoretical computations, and it has been proven that the theoretical method is reliable.

  15. Super-resolution optical telescopes with local light diffraction shrinkage

    OpenAIRE

    Changtao Wang; Dongliang Tang; Yanqin Wang; Zeyu Zhao; Jiong Wang; Mingbo Pu; Yudong Zhang; Wei Yan; Ping Gao; Xiangang Luo

    2015-01-01

    Suffering from giant size of objective lenses and infeasible manipulations of distant targets, telescopes could not seek helps from present super-resolution imaging, such as scanning near-field optical microscopy, perfect lens and stimulated emission depletion microscopy. In this paper, local light diffraction shrinkage associated with optical super-oscillatory phenomenon is proposed for real-time and optically restoring super-resolution imaging information in a telescope system. It is found ...

  16. The Process of Shrinkage as a Challenge to Urban Governance

    Directory of Open Access Journals (Sweden)

    Stryjakiewicz Tadeusz

    2016-06-01

    Full Text Available For many decades most researchers, planners and local authorities have been focusing almost exclusively on urban growth and its socio-economic and spatial consequences. However, in the current debate concerning the future of cities and regions in Europe the process of their shrinkage starts to attract more attention. In the conditions of a declining population, urban governance is an important challenge for local authorities, being usually much more difficult than during the periods of population growth.

  17. Evaluating plastic shrinkage and permeability of polypropylene fiber reinforced concrete

    Directory of Open Access Journals (Sweden)

    G.M. Sadiqul Islam

    2016-12-01

    Full Text Available Plastic concrete is susceptible to develop cracks due to shrinkage in dry and windy conditions. Addition of fibers could reduce propagation of this crack. On the other hand, permeability determines the durability properties of concrete. This study evaluated strength, plastic shrinkage and permeability (gas and water of concrete incorporating ‘polypropylene’ fiber (aspect ratio 300 in various proportions (viz. 0.10%, 0.15%, 0.2%, 0.25% and 0.3% by volume of concrete. Plane concrete samples were also prepared and tested for reference purpose. Inclusion of 0.1% fiber gave minor reduction (2% in compressive strength while the tensile strength increased by 39% with same fiber content compared to the plain concrete. A significant reduction in crack generation, appearance period of first crack and crack area between plane concrete and fiber reinforced concretes was found. The experimental result with inclusion of 0.1–0.3% fiber in concrete indicated that plastic shrinkage cracks were reduced by 50–99% compared to the plain concrete. For reference concrete (without fiber, test within the high temperature and controlled humidity chamber gave higher crack width than the acceptable limit (3 mm specified by the ACI 224. With the inclusion of 0.1% fiber reduced the crack width down to 1 mm and the trend was continued with the addition of more fibers. However, results showed that with the addition of polypropylene fiber both water and gas permeability coefficient was increased. Therefore, it is concluded that the fiber reinforced concrete would work better for plastic shrinkage susceptible structural elements (flat elements such as slab; however, it requires careful judgement while applying to a water retaining structures.

  18. Polymerization shrinkage of flowable resin-based restorative materials

    OpenAIRE

    Stavridakis, Minos M; Dietschi, Didier; Krejci, Ivo

    2005-01-01

    This study measured the linear polymerization displacement and polymerization forces induced by polymerization shrinkage of a series of flowable resin-based restorative materials. The materials tested were 22 flowable resin-based restorative materials (Admira Flow, Aelite Flow, Aeliteflow LV, Aria, Crystal Essence, Definite Flow, Dyract Flow, Filtek Flow, FloRestore, Flow-it, Flow-Line, Freedom, Glacier, OmegaFlo, PermaFlo, Photo SC, Revolution 2, Star Flow, Synergy Flow, Tetric Flow, Ultrase...

  19. Sellar lesion: Not always a pituitary adenoma

    Directory of Open Access Journals (Sweden)

    Rao Shalinee

    2008-04-01

    Full Text Available Inflammatory lesions of the hypophysis account for 0.5% of all symptomatic diseases of the pituitary, which include lymphocytic hypophysitis, granulomatous hypophysitis with or without specific etiology and pituitary abscess. Sellar tuberculoma is a rare type of granulomatous hypophysitis. We document a case of a postmenopausal lady who presented with galactorrhea, headache and blurring of vision. Based on preliminary investigations, a clinical diagnosis of pituitary adenoma was made and the pituitary gland was surgically excised. Histopathological examination showed caseating granulomas, along with normal areas of preserved pituitary gland and a final diagnosis of tuberculous hypophysitis was made. This case is being documented due to the extremely rare involvement of the pituitary gland by granulomatous lesions such as tuberculosis and to emphasize the role of intraoperative consultation to obviate the need for radical surgery in such lesions.

  20. Growth hormone-secreting pituitary adenoma:clinical and MR imaging findings

    Energy Technology Data Exchange (ETDEWEB)

    Park, Hong Suk; Chang, Kee Hyun; Han, Moon Hee; Sim, Jung Suk; Lee, Sang Hyun; Song, Jae Uoo; Yoo, In Kyu; Jung, Hee Won; Yeon, Kyung Mo [Seoul National Univ. College of Medicine, Seoul (Korea, Republic of)

    1996-10-01

    To describe clinical and MRI findings of growth hormone-secreting pituitary adenoma, to determine if there are any characteristic MRI findings different from those of other pituitary adenomas, to evaluate the relationship between tumor size and serum growth hormone level, and to assess the results of immunohi-stochemical study. We retrospectively analysed clinical and MRI findings of 29 patients with growth hormone-secreting pituitary adenoma confirmed by serum growth hormone level and surgery. We also evaluated the relationship between the tumor volume and serum growth hormone level, and the results of immunohistochemical study. Coronal and sagittal T1-weighted MR images in all patients and gadolinium-enhanced T1-weighted MR images in 28 patients were obtained with 2.0 T(24 cases) and 0.5 T(5 cases) MR imagers. The images were analyzed in terms of tumor size, signal intensity, degree of contrast enhancement, extent of tumor growth and the presence or absence of cystic change, hemorrhage and calcification. Clinical manifestations included facial feature change and soft tissue swelling of hands and feet(n=29), headache(n=12), impaired visual acuity(n=9), symptoms of hyperprolactinemia(n=8), visual field defect(n=5), and others(n=6). On MR images, all of the 29 cases were seen to be macroadenomas and the size of the tumors averaged 2.2cm(1-5.2cm). Supra- and infrasellar extensions were seen in 21 and 22 patients, respectively. Cavernous sinus invasion was noted in seven, and in one this was bilateral. Signal intensity was isointense with cortical grey matter in 26 cases(90%). Cystic change or necrosis was seen in eight cases(28%), hemorrhage in four(14%), and calcification in two(7%). After enhancement, most(25/28) of the tumors enhanced less than normal pituitary in degree. There was no correlation between serum growth hormone level and tumor size. Immunohistochemical study showed positive growth hormone-secreting pituitary adenomas were various and included

  1. Metastatic Mantle Cell Lymphoma to the Pituitary Gland: Case Report and Literature Review

    Directory of Open Access Journals (Sweden)

    Arthur Wang

    2016-01-01

    Full Text Available We present an unusual case of a metastatic mantle cell lymphoma (MCL to the pituitary gland. The patient had a known history of MCL for which she previously received chemotherapy. She presented with new-onset diplopia and confusion, and reported a history of progressive vision blurriness associated with headache, nausea, and vomiting. MRI of the brain showed an enhancing lesion within the sella turcica involving the cavernous sinuses bilaterally, extending into Meckel's cave on the left, and abutting the optic nerves bilaterally. Following surgical excision, histopathology revealed the tumor to be a MCL. Metastatic pituitary tumors are rare and have been estimated to make up 1% of tumors discovered in the sellar region. The two most common secondary metastatic lesions to the sella are breast and lung carcinoma followed by prostate, renal cell, and gastrointestinal carcinoma. Metastatic lymphoma to the pituitary gland is especially rare and is estimated to constitute 0.5% of all metastatic tumors to the sella turcica. To our knowledge, this is the first reported case of MCL metastasizing to the pituitary gland.

  2. Metastatic Mantle Cell Lymphoma to the Pituitary Gland: Case Report and Literature Review

    Science.gov (United States)

    Wang, Arthur; Carberry, Nathan; Solli, Elena; Kleinman, George; Tandon, Adesh

    2016-01-01

    We present an unusual case of a metastatic mantle cell lymphoma (MCL) to the pituitary gland. The patient had a known history of MCL for which she previously received chemotherapy. She presented with new-onset diplopia and confusion, and reported a history of progressive vision blurriness associated with headache, nausea, and vomiting. MRI of the brain showed an enhancing lesion within the sella turcica involving the cavernous sinuses bilaterally, extending into Meckel's cave on the left, and abutting the optic nerves bilaterally. Following surgical excision, histopathology revealed the tumor to be a MCL. Metastatic pituitary tumors are rare and have been estimated to make up 1% of tumors discovered in the sellar region. The two most common secondary metastatic lesions to the sella are breast and lung carcinoma followed by prostate, renal cell, and gastrointestinal carcinoma. Metastatic lymphoma to the pituitary gland is especially rare and is estimated to constitute 0.5% of all metastatic tumors to the sella turcica. To our knowledge, this is the first reported case of MCL metastasizing to the pituitary gland. PMID:26933415

  3. CT findings in symptomatic Rathke's cleft cysts of the pituitary gland

    Energy Technology Data Exchange (ETDEWEB)

    Dietemann, J.L.; Wackenheim, A.; Bonneville, J.F.; Cattin, F.; Buchheit, F.; Heldt, N.

    1983-03-01

    Symptomatic intrasellar Rathke's cleft cysts are rather rare: only a few cases with CT findings have been reported. The authors describe the CT appearance of 3. Histological aspects and embryology are discussed. Rathke's cleft cysts have to be differentiated from other intersellar tumors: cystic craniopharyngiomas, cystic or necrotic pituitary adenomas, cysticercosis.

  4. Dynamic computed tomography of the pituitary gland using a single slice scanner in dogs with pituitary-dependent hypercortisolism

    NARCIS (Netherlands)

    Del Magno, Sara; Grinwis, Guy C M; Voorhout, George; Meij, Björn P.

    2016-01-01

    Selective removal of the pituitary adenoma has not been advocated in dogs with pituitary-dependent hypercortisolism because the pituitary adenoma is usually not visualized on routine computed tomography (CT).Dynamic pituitary CT scanning is aimed at the detection of the pituitary flush and, indirect

  5. Prediction of Prestressing Losses by Concrete Creep and Shrinkage

    Energy Technology Data Exchange (ETDEWEB)

    Woo, S.K. [Korea Electric Power Research Institute, Taejon (Korea)

    1999-07-01

    In this study, the personal-computer program was developed to predict prestressing losses of containment structures induced by concrete creep and shrinkage in nuclear power plants. Thie program is composed of three major parts in which are the pre-processor, calculation module and post-processor. Input data for this program are: material properties of concrete, rebar, liner and duct, test results of concrete creep and shrinkage, relative humidity, dimension of containment structures, and the number of prestressing tendon related in containment structures. To obtain better results, this program was designed to reflect the prestressing losses due to influence that occurred after prestressing of each tendon, thus it can predict prestressing losses and allowable prestressing forces of each tendon. As a case study, this program was applied to containment structures of Youngkwang 3 and 4 NPP's and analytical results were compared with test results in Inservice Inspection of containment structures. From this comparison, it was proved that this program could well predict prestressing losses by concrete creep and shrinkage. (author). 4 refs., 1 fig., 3 tabs.

  6. PREDIKSI SHRINKAGE UNTUK MENGHINDARI CACAT PRODUK PADA PLASTIC INJECTION

    Directory of Open Access Journals (Sweden)

    Agus Dwi Anggono

    2015-05-01

    Full Text Available Plastic injection merupakan proses manufactur untuk membuat produk dengan bahan dasar plastic atau dalam kesempatan ini polypropylene. Pada proses tersebut seringkali terjadi cacat produk seperti pengerutan, retak, dimensi tidak sesuai dan kerusakan saat produk keluar dari mould, sehingga banyak material yang terbuang percuma. Meskipun cacat produk tersebut dipengaruhi banyak factor, tetapi yang paling utama adalah masalah shrinkage, atau penyusutan material setelah terjadi pendinginan. Sangat penting untuk melakukan prediksi lebih awal terjadinya penyusutan setelah pendinginan untuk menghindari cacat produk. Dalam penelitian ini akan dilakukan prediksi shrinkage yang akan digunakan untuk material polypropylene dengan cara perhitungan standar. Pembuatan modeling dalam bentuk 3D (tiga dimensi injection molding baik cavity maupun corenya dengan menggunakan CATIA, kemudian dilakukan analisis dengan software MoldFlow untuk pembuatan mesh dan memberikan batasan panas pada komponen sehingga dapat diketahui mode penyusutannya. Analisis ini akan memberikan gambaran tentang distribusi panas pada mould dan memberikan tentang gambaran aliran fluida. Pada analisis tersebut dapat dilihat gejala terjadinya cacat produk, jika hal itu terjadi maka perlu dilakukan perubahan shrinkage, sampai diperoleh hasil analisis yang baik.

  7. Controlled Shrinkage of Expanded Glass Particles in Metal Syntactic Foams

    Directory of Open Access Journals (Sweden)

    Kadhim Al-Sahlani

    2017-09-01

    Full Text Available Metal matrix syntactic foams have been fabricated via counter-gravity infiltration of a packed bed of recycled expanded glass particles (EG with A356 aluminum alloy. Particle shrinkage was studied and has been utilized to increase the particles’ strength and tailor the mechanical properties of the expanded glass/metal syntactic foam (EG-MSF. The crushing strength of particles could be doubled by shrinking them for 20 min at 700 °C. Owing to the low density of EG (0.20–0.26 g/cm3, the resulting foam exhibits a low density (1.03–1.19 g/cm3 that increases slightly due to particle shrinkage. Chemical and physical analyses of EG particles and the resulting foams were conducted. Furthermore, metal syntactic foam samples were tested in uni-axial compression tests. The stress-strain curves obtained exhibit three distinct regions: elastic deformation followed by a stress plateau and densification commencing at 70–80% macroscopic strain. Particle shrinkage increased the mechanical strength of the foam samples and their average plateau stress increased from 15.5 MPa to 26.7 MPa.

  8. Controlled Shrinkage of Expanded Glass Particles in Metal Syntactic Foams.

    Science.gov (United States)

    Al-Sahlani, Kadhim; Taherishargh, Mehdi; Kisi, Erich; Fiedler, Thomas

    2017-09-13

    Metal matrix syntactic foams have been fabricated via counter-gravity infiltration of a packed bed of recycled expanded glass particles (EG) with A356 aluminum alloy. Particle shrinkage was studied and has been utilized to increase the particles' strength and tailor the mechanical properties of the expanded glass/metal syntactic foam (EG-MSF). The crushing strength of particles could be doubled by shrinking them for 20 min at 700 °C. Owing to the low density of EG (0.20-0.26 g/cm³), the resulting foam exhibits a low density (1.03-1.19 g/cm³) that increases slightly due to particle shrinkage. Chemical and physical analyses of EG particles and the resulting foams were conducted. Furthermore, metal syntactic foam samples were tested in uni-axial compression tests. The stress-strain curves obtained exhibit three distinct regions: elastic deformation followed by a stress plateau and densification commencing at 70-80% macroscopic strain. Particle shrinkage increased the mechanical strength of the foam samples and their average plateau stress increased from 15.5 MPa to 26.7 MPa.

  9. The physical effects of an intra-aggregate structure on soil shrinkage

    CERN Document Server

    Chertkov, V Y

    2014-01-01

    Clay and soil containing it have shrinkage curves that are qualitatively different in shape. The objective of this work is to qualitatively show with maximum simplicity, how a clay shrinkage curve turns into a soil shrinkage curve. Because of the crack volume the measured shrinkage curve is not the single-valued feature of a soil. We use a concept of the reference shrinkage curve that is only stipulated by soil shrinkage without cracking, single-valued, and qualitatively similar to an observed shrinkage curve. We also use new concepts of an intra-aggregate soil structure: (i) a rigid superficial layer of aggregates that loses water during shrinkage; and (ii) lacunar pores (micro-cracks) inside an intra-aggregate clay that change in volume during shrinkage. Then, through a series of consecutive steps, illustrating each step by a separate graphic presentation, we move from a clay shrinkage curve to a soil shrinkage curve with predicted qualitative features that coincide with those experimentally observed in num...

  10. Case report: ACTH-secreting pituitary carcinoma metastatic to the liver in a patient with a history of atypical pituitary adenoma and Cushing's disease.

    Science.gov (United States)

    Joehlin-Price, Amy S; Hardesty, Douglas A; Arnold, Christina A; Kirschner, Lawrence S; Prevedello, Daniel M; Lehman, Norman L

    2017-04-18

    Pituitary carcinoma is a rare entity requiring the presence of metastasis to confirm its malignant potential. We report a case of pituitary carcinoma and discuss the diagnosis and management of this lesion in relation to the existing literature. The patient is a 51-year-old woman with Cushing's disease and intact adrenal glands who was diagnosed with metastatic pituitary carcinoma to the liver, 29 months after initial resection of an ACTH-secreting primary atypical pituitary adenoma (APA). Prior to detection of this metastasis the patient underwent repeat resection and radiotherapy for residual cavernous sinus disease. The metastatic lesion was detected by interval surveillance of serum ACTH and 24-hour urine cortisol, which despite stable pituitary MRI, were significantly elevated. These abnormalities prompted a PET scan that demonstrated hypermetabolic liver parenchyma, which was suspicious for metastasis on abdominal MRI. An ultrasound-guided liver biopsy demonstrated nests of moderately-differentiated cells with intermediate-sized, monotonous nuclei, distinct nucleoli, and abundant basophilic cytoplasm, confirmed by immunohistochemistry to represent metastatic pituitary carcinoma. The liver lesion was subsequently successfully removed by wedge resection. One year later, the patient's residual cavernous sinus disease grew markedly, and she was placed on dual-agent chemotherapy consisting of oral temozolomide and capecitabine, with stabilization of her intracranial disease to present, although liver metastases recurred. Pituitary carcinoma is a rare entity impossible to recognize as a primary tumor because its diagnosis by definition requires the presence of metastasis. Maintaining awareness of the entity and its precursor lesion APA is essential for its accurate pathologic diagnosis and appropriate management.

  11. Evaluation of shrinkage and cracking in concrete of ring test by acoustic emission method

    Science.gov (United States)

    Watanabe, Takeshi; Hashimoto, Chikanori

    2015-03-01

    Drying shrinkage of concrete is one of the typical problems related to reduce durability and defilation of concrete structures. Lime stone, expansive additive and low-heat Portland cement are used to reduce drying shrinkage in Japan. Drying shrinkage is commonly evaluated by methods of measurement for length change of mortar and concrete. In these methods, there is detected strain due to drying shrinkage of free body, although visible cracking does not occur. In this study, the ring test was employed to detect strain and age cracking of concrete. The acoustic emission (AE) method was adopted to detect micro cracking due to shrinkage. It was recognized that in concrete using lime stone, expansive additive and low-heat Portland cement are effective to decrease drying shrinkage and visible cracking. Micro cracking due to shrinkage of this concrete was detected and evaluated by the AE method.

  12. Expression and mutation analysis of Tpit in the canine pituitary gland and corticotroph adenomas.

    Science.gov (United States)

    Hanson, J M; Mol, J A; Leegwater, P A J; Bilodeau, S; Drouin, J; Meij, B P

    2008-04-01

    Pituitary-dependent hyperadrenocorticism (PDH) in dogs is caused by a pituitary corticotroph adenoma. Although PDH is a common disorder in dogs, little is known about the underlying pathogenesis. In the pituitary glands of humans and mice, the pro-opiomelanocortin (POMC)-expressing cell lineages, the corticotrophs and melanotrophs, have a specific marker in common, the T-box transcription factor Tpit (Tbx19), which is obligate for POMC expression. Tpit also regulates the late differentiation of the corticotrophs and melanotrophs, and therefore may contribute to the pathogenesis of the corticotroph adenomas. The aim of this study was to perform an expression and mutation analysis of Tpit in the normal canine pituitary and in corticotroph adenomas. The distribution of the Tpit protein in the pituitary gland was studied with immunohistochemistry and the expression of the gene with RT-PCR. The coding region of Tpit cDNA from 14 dogs with PDH was screened for mutations. Tpit was expressed in corticotroph and melanotroph cells of the normal and adenomatous canine pituitary, and remained present in non-adenomatous corticotrophs of pituitaries from PDH dogs. No tumor-specific mutation in the Tpit cDNA from the corticotroph adenomas was found. However, a missense polymorphism in the highly conserved DNA-binding domain, the T-box, was discovered in one dog. It is concluded that Tpit can be used as a reliable marker for the corticotroph and melanotroph cells in the canine pituitary tissue and that mutations in the Tpit gene are unlikely to play a major role in the pathogenesis of canine corticotroph adenomas.

  13. Temozolomide treatment of a pituitary carcinoma and two pituitary macroadenomas resistant to conventional therapy

    DEFF Research Database (Denmark)

    Hagen, C; Schroeder, H D; Hansen, S

    2009-01-01

    OBJECTIVE: Aggressive pituitary tumours may be difficult to treat. Temozolomide (TMZ) is an alkylating cytostaticum. In a small number of cases, TMZ therapy has been reported to reduce pituitary tumour size and hormone hypersecretion. DESIGN: We present three patients with pituitary tumours treat...

  14. A Rare Cause of Hypopituitarism: Pituitary Tuberculosis

    Directory of Open Access Journals (Sweden)

    Şazi İmamoğlu

    2012-03-01

    Full Text Available Pituitary tuberculosis is a rare condition that can present with hypopituitarism even without any evidence of systemic tuberculosis and is easily confused with pituitary adenomas. Headache and hypopituitarism are the most common presenting symptoms. We report the case of pituitary tuberculosis in a 39-year-old male patient who presented with panhypopituitarism. Although it is rare and difficult to diagnose, pituitary tuberculosis should be considered in every nonfunctional sellar masses, especially in fairly small ones with unexpected hypopituitarism. Turk Jem 2012; 16: 26-8

  15. Light bodies in human pituitary adenomas

    DEFF Research Database (Denmark)

    Holck, S; Wewer, U M; Albrechtsen, R

    1987-01-01

    Light bodies are large cytoplasmic granules originally described in the gonadotrophic cells of the rat pituitary gland. In order to determine whether similar bodies occur in the human anterior pituitary gland, 89 pituitary adenomas and periadenomatous tissue from 20 cases were examined by transmi......Light bodies are large cytoplasmic granules originally described in the gonadotrophic cells of the rat pituitary gland. In order to determine whether similar bodies occur in the human anterior pituitary gland, 89 pituitary adenomas and periadenomatous tissue from 20 cases were examined...... by transmission electron microscopy. Double membrane bound bodies with filamentous internal structure identical to rodent light bodies were identified in 10 hormone-producing adenomas: 5 PRL, 1 PRL-GH, 2 GH, and 2 ACTH-producing tumours. No light bodies were found in the remaining 79 tumours nor in the pituitary...... cells in periadenomatous tissue from 20 cases. These results show that some human pituitary adenomas may contain light bodies identical to those seen in gonadotrophs of rat pituitary....

  16. [Old phenotype and new genotypes. Pituitary adenomas].

    Science.gov (United States)

    Gérard, C; Jedidi, H; Petrossians, P; Krzesinski, F; Daly, A; Beckers, A

    2015-11-01

    Gigantism and acromegaly, usually caused by a pituitary adenoma linked inappropriate secretion of growth hormone (GH), are generally considered as very rare diseases, even if, according to some authors, their cumulative prevalence is about 1/5000. Starting from the historical case of a giant from Liège we shall describe the different types of GH pituitary adenomas and their pathophysiology. We shall particularly discuss rare forms of inherited GH secreting pituitary adenomas like the FIPA (familial inherited isolated pituitary adenomas) and the X-LAG (X linked acrogigantism), both described for the first time in Liège, in 2000 and 2014, respectively.

  17. Management of clinically non-functioning pituitary adenoma.

    Science.gov (United States)

    Chanson, Philippe; Raverot, Gerald; Castinetti, Frédéric; Cortet-Rudelli, Christine; Galland, Françoise; Salenave, Sylvie

    2015-07-01

    Clinically NFPA is currently the preferred term for designing all the pituitary adenomas which are not hormonally active (in other words, not associated with clinical syndromes such as amenorrhea-galactorrhea in the context of prolactinomas, acromegaly, Cushing's disease or hyperthyroidism secondary to TSH-secreting adenomas). They account for 15-30% of pituitary adenomas. Diagnosis is usually made either in the context of mass effect due to a macroadenoma or, increasingly, fortuitously during imaging performed for some unrelated purpose; the latter case is known as pituitary incidentaloma. Surgery is indisputably indicated in case of tumoral syndrome, but other aspects of NFPA (hormonal work-up, follow-up, and especially postoperative follow-up, management of remnant or recurrence, the special case of incidentaloma, or apoplexy) remain controversial. The French Endocrinology Society (SFE) therefore set up an expert working group of endocrinologists, neurosurgeons, ophthalmologists, neuroradiologists, pathologists and biologists to draw up guidelines, at the 2012 SFE Congress in Toulouse, France. The present article presents the guidelines suggested by this group of French-speaking experts. Copyright © 2015 Elsevier Masson SAS. All rights reserved.

  18. Hormonal and morphological study of the pituitaries in reeler mice

    National Research Council Canada - National Science Library

    Lombardero, Matilde; Kovacs, Kalman; Horvath, Eva; Salazar, Ignacio

    2007-01-01

    .... Since the brain is one of the main regulator of pituitary hormone secretion and no information was reported regarding pituitary function and structure in these mutant mice, we studied pituitary...

  19. Fetal Alcohol Exposure Reduces Dopamine Receptor D2 and Increases Pituitary Weight and Prolactin Production via Epigenetic Mechanisms.

    Directory of Open Access Journals (Sweden)

    Omkaram Gangisetty

    Full Text Available Recent evidence indicated that alcohol exposure during the fetal period increases the susceptibility to tumor development in mammary and prostate tissues. Whether fetal alcohol exposure increases the susceptibility to prolactin-producing tumor (prolactinoma development in the pituitary was studied by employing the animal model of estradiol-induced prolactinomas in Fischer 344 female rats. We employed an animal model of fetal alcohol exposure that simulates binge alcohol drinking during the first two trimesters of human pregnancy and involves feeding pregnant rats with a liquid diet containing 6.7% alcohol during gestational day 7 to day 21. Control rats were pair-fed with isocaloric liquid diet or fed ad libitum with rat chow diet. Adult alcohol exposed and control female offspring rats were used in this study on the day of estrus or after estrogen treatment. Results show that fetal alcohol-exposed rats had increased levels of pituitary weight, pituitary prolactin (PRL protein and mRNA, and plasma PRL. However, these rats show decreased pituitary levels of dopamine D2 receptor (D2R mRNA and protein and increased pituitary levels of D2R promoter methylation. Also, they show elevated pituitary mRNA levels of DNA methylating genes (DNMT1, DNMT3b, MeCP2 and histone modifying genes (HDAC2, HDAC4, G9a. When fetal alcohol exposed rats were treated neonatally with a DNA methylation inhibitor 5-Aza deoxycytidine and/or a HDAC inhibitor trichostatin-A their pituitary D2R mRNA, pituitary weights and plasma PRL levels were normalized. These data suggest that fetal alcohol exposure programs the pituitary to increase the susceptibility to the development of prolactinomas possibly by enhancing the methylation of the D2R gene promoter and repressing the synthesis and control of D2R on PRL-producing cells.

  20. 谷胱甘肽对多巴胺诱导的GH4细胞凋亡的保护作用%Glutathione protects GH4 pituitary lactotrope tumor cells from apoptosis induced by dopamine

    Institute of Scientific and Technical Information of China (English)

    王晗; 李书鹏; 姜玉华; 刘芳

    2011-01-01

    Objective To explore mechanisms of dopamine(DA) inducing GH4 cell apoptosis and glutathione(GSH) protecting GH4 cells from apoptosis induced by DA. Methods ① GH4 pituitary cells were treated with DA at 0, 100, 300 and 500μmol/L for 24 h, then treated with DA at 500 μmol/L for 0,1,3,5,12 and 24 h to select the appropriate concentration and time. ② Then GH4 cells were treated with raclopride( a D2 receptor antagonist, Rac) and GSH to explore the effects of Rac and GSH on apoptosis. ③Apoptotic cells were counted by an inverted phase contrast microscope. Morphological appearance was observed by PI labeling, and expressions of Bcl-2 and PARP-1 were detected by Western blot. Results DA induced concentration-and time-dependent GH4 cell apoptosis. A selective D2 receptor antagonist could not block the cytotoxic effect. PI revealed that exposure to GSH (1 mmol/L) for lh prior to the DA treatment attenuated DA-induced apoptosis. Western blot showed up-regulation of Bcl-2 and down-regulation of PARP-1. Conclusion DA exerts cytotoxic effects on GH4 cells mainly through auto-oxidation in the intracellular space. A selective D2 receptor antagonist cannot block DA-induced apoptosis, while GSH can block it, which may be relevant to regulation of Bcl-2 and PARP-1.%目的 探讨多巴胺(DA)诱导垂体瘤GH4细胞凋亡及谷胱甘肽(GSH)对DA诱导细胞凋亡的保护作用机制.方法 本实验通过3部分探讨DA的凋亡作用及GSH的保护作用:①实验分空白对照组及DA用药组,体外观察不同浓度、时间DA对GH4细胞生长的影响;②实验分空白对照组、DA组、DA联合DA D2受体拮抗剂组,观察D2受体在细胞凋亡中的作用;③实验设空白对照组、DA组、GSH用药组,PI染色分别观察3组细胞的凋亡情况,Western blot检测Bcl-2及PARP-1的表达.结果 DA诱导的GH4细胞凋亡呈浓度-时间依赖性,选择性D2受体拮抗剂不能阻断细胞凋亡,经GSH处理GH4细胞后,PI染色显示凋

  1. Aryl‐hydrocarbon receptor activity modulates prolactin expression in the pituitary

    Energy Technology Data Exchange (ETDEWEB)

    Moran, Tyler B.; Brannick, Katherine E.; Raetzman, Lori T., E-mail: raetzman@life.illinois.edu

    2012-11-15

    Pituitary tumors account for 15% of intracranial neoplasms, however the extent to which environmental toxicants contribute to the proliferation and hormone expression of pituitary cells is unknown. Aryl-hydrocarbon receptor (AhR) interacting protein (AIP) loss of function mutations cause somatotrope and lactotrope adenomas in humans. AIP sequesters AhR and inhibits its transcriptional function. Because of the link between AIP and pituitary tumors, we hypothesize that exposure to dioxins, potent exogenous ligands for AhR that are persistent in the environment, may predispose to pituitary dysfunction through activation of AhR. In the present study, we examined the effect of AhR activation on proliferation and endogenous pituitary hormone expression in the GH3 rat somatolactotrope tumor cell line and the effect of loss of AhR action in knockout mice. GH3 cells respond to nM doses of the reversible AhR agonist β-naphthoflavone with a robust induction of Cyp1a1. Although mRNA levels of the anti-proliferative signaling cytokine TGFbeta1 are suppressed upon β-naphthoflavone treatment, we did not observe an alteration in cell proliferation. AhR activation with β-naphthoflavone suppresses Ahr expression and impairs expression of prolactin (PRL), but not growth hormone (GH) mRNA in GH3 cells. In mice, loss of Ahr similarly leads to a reduction in Prl mRNA at P3, while Gh is unaffected. Additionally, there is a significant reduction in pituitary hormones Lhb and Fshb in the absence of Ahr. Overall, these results demonstrate that AhR is important for pituitary hormone expression and suggest that environmental dioxins can exert endocrine disrupting effects at the pituitary. -- Highlights: ► AhR signaling suppresses Prl mRNA expression. ► AhR signaling does not influence pituitary proliferation in culture. ► AhR is necessary for Prl, Lhb and Fshb expression at postnatal day 3.

  2. Histopathological features of post-mortem pituitaries: A retrospective analysis

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