WorldWideScience
 
 
1

MRI of pseudocoarctation of the aorta: morphological and cine-MRI findings.  

Science.gov (United States)

We report a case of pseudocoarctation of the thoracic aorta diagnosed by magnetic resonance imaging. Morphological spin-echo findings and cine-MRI performed by gradient-echo multiphase images are reported. No other more invasive examinations were needed to establish the diagnosis of pseudocoarctation and to differentiate from other aortic abnormalities. PMID:8734782

Soler, R; Pombo, F; Bargiela, A; Gayol, A; Rodríguez, E

1995-01-01

2

Cine MRI of hypertrophic cardiomyopathy  

International Nuclear Information System (INIS)

Cine MRI was performed using 1.5T or 0.5T MR units in eleven patients with hypertrophic cardiomyopathy. Septal and posterior wall thickness measured by cine MRI correlated well with those obtained by ultrasonographic cardiogram. In hypertrophic obstructive cardiomyopathy, cine MRI demonstrated the site and nature of obstructive change in left ventricle. Cine MRI also showed flow void due to mitral regurgitation successfully. We considered cine MRI is useful means to evaluate the anatomical and functional findings in hypertrophic cardiomyopathy. (author)

3

Upper Airway Volume Segmentation Analysis Using Cine MRI Findings in Children with Tracheostomy Tubes  

International Nuclear Information System (INIS)

The purpose of this study is to evaluate the airway dynamics of the upper airway as depicted on cine MRI in children with tracheotomy tubes during two states of airflow through the upper airway. Sagittal fast gradient echo cine MR images of the supra-glottic airway were obtained with a 1.5T MRI scanner on seven children with tracheotomy tubes. Two sets of images were obtained with either the tubes capped or uncapped. The findings of the cine MRI were retrospectively reviewed. Volume segmentation of the cine images to compare the airway volume change over time (mean volume, standard deviation, normalized range, and coefficient of variance) was performed for the capped and uncapped tubes in both the nasopharynx and hypopharynx (Signed Rank Test). Graphical representation of the airway volume over time demonstrates a qualitative increased fluctuation in patients with the tracheotomy tube capped as compared to uncapped in both the nasopharyngeal and hypopharyngeal regions of interest. In the nasopharynx, the mean airway volume (capped 2.72 mL, uncapped 2.09 mL, p = 0.0313), the airway volume standard deviation (capped 0.42 mL, uncapped 0.20 mL, p = 0.0156), and the airway volume range (capped 2.10 mL, uncapped 1.09 mL, p = 0.0156) were significantly larger in the capped group of patients. In the hypopharynx, the airway volume standard deviation (capped 1.54 mL, uncapped 0.67 mL, p = 0.0156), and the airway volume range (capped 6.44 mL, uncapped 2.93 mL, p = 0.0156) were s4 mL, uncapped 2.93 mL, p = 0.0156) were significantly larger in the capped tubes. The coefficient of variance (capped 0.37, uncapped 0.26, p = 0.0469) and the normalized range (capped 1.52, uncapped 1.09, p = 0.0313) were significantly larger in the capped tubes. There is a statistically significant change in airway dynamics in children with tracheotomy tubes when breathing via the airway as compared to breathing via the tracheotomy tube

4

Functional cine-MRI of the pelvic floor - normal anatomy and pathologic findings  

International Nuclear Information System (INIS)

Purpose. Functional MRI of the pelvic floor allows mapping and definition of different forms of pelvic floor dysfunction. Methods. We performed functional MRT of the pelvic floor in 39 healthy nulliparas and 324 patients. The diagnosis of a pathological organ descent was made if certain landmarks of the pelvic floor compartments descended below the pubococcygeal reference-line (PC-line). Results. If there was no organ descent below the PC-line on straining and if the pelvic floor muscles hardly changed position, a normal finding was diagnosed. 70% of organ prolapses came in the combined form. The generally gradual development of an organ descent led to a change of the main finding in 21,6%. The masking of a cystocele (48,6%) or of an enterocele (34,3%) by a rectocele was most frequent in these cases. Discussion. The use of functional MRI of the pelvic floor appears to be especially useful in young patients, in cases of divergent clinical and sonographic or radiological findings and if the presence of a predominant hernial sac with or without enterocele/rectocele is supposed. (orig.)

5

Cine MRI of swallowing in patients with advanced oral or oropharyngeal carcinoma: a feasibility study.  

Science.gov (United States)

Treatment of oral and oropharyngeal cancer may cause dysphagia. Purpose is to examine whether cine magnetic resonance imaging (MRI) yields additional information compared to standard examination in the evaluation of posttreatment dysphagia and mobility of oral and oropharyngeal structures. Thirty-four cine MRIs were made in 23 patients with advanced oral and oropharyngeal cancer, consisting of an MR image every 800 ms during swallowing which is compared to videofluoroscopy and quality of life questionnaires. A scoring system was applied to assess mobility on cine MR and videofluoroscopy leading to a score ranging from 9 to 17. Cine MRI of the swallowing in a midsagittal plane visualized the tumor (if located in the same plane), important anatomic structures and surgical reconstructions. Posttreatment mobility on cine MRI and videofluoroscopy was significantly diminished compared to pretreatment, mean pretreatment cine MRI score was 10.8 and posttreatment 12.4 (p = 0.017). Impaired mobility on cine MRI was significantly correlated to more swallowing problems (Spearman's correlation coefficient 0.73, p = 0.04), on videofluoroscopy not. Cine MRI is a promising new technique as an adjunct to standard examinations for evaluation of swallowing in patients with oral and oropharyngeal cancer. Cine MRI directly visualizes the dynamics of swallowing and allows evaluation of pre- and posttreatment differences. Abnormal findings are significantly correlated with subjective swallowing complaints of patients. PMID:22218846

Kreeft, Anne Marijn; Rasch, Coen R N; Muller, Sara H; Pameijer, Frank A; Hallo, Eeke; Balm, Alfons J M

2012-06-01

6

Cine MRI of patients with cervical myelopathy  

International Nuclear Information System (INIS)

Forty-six patients with cervical myelopathy were examined before and after surgery by cine magnetic resonance imaging (MRI). According to the occurrence site and degree of flow void, cerebrospinal fluid (CSF) flow void was classified into five: anterior type (flow void mainly in the anterior part of subarachnoid space), posterior type (mainly in the posteiror part), anteroposterior type (in the anterior and posterior parts), incomplete block type (flow void limited to the upper and lower parts of the block), and complete block type (no flow void). None of the 46 patients had normal CSF flow void on cine MRI before surgery. CSF flow void was seen in systolic phase on ECG (from 150 to 300 msec from R's wave) in all patients after spinal cord decompression. Postoperative CBF flow void types correlated well with surgical method, disease, and postoperative vertebral alignment. Postoperative outcome was the most excellent in the group of posterior type and the poorest in the group of anteroposterior type, showing a significant difference between the groups. Cine MRI is a useful noninvasive, dynamic method for assessing postoperative decompression effect. (N.K.)

7

Cine-MRI swallowing evaluation after tongue reconstruction  

Energy Technology Data Exchange (ETDEWEB)

Objective: To determine the feasibility of cine-MRI for non-invasive swallowing evaluation after surgery for lingual carcinoma with reconstruction using microvascular free flaps. Methods: Ten patients with stage IV carcinoma of the mobile tongue and/or tongue base treated by surgical resection and reconstruction with a free flap were evaluated after an average of 4.3 years (range: 1.5-11 years), using cine-MRI in 'single-shot fast spin echo' (SSFSE) mode. Fiberoptic laryngoscopy of swallowing was performed before MRI to detect aspiration. The tolerance and ability to complete the exam were noted. The mobilities of the oral and pharyngeal structures visualized were evaluated as normal, reduced or increased. Results: Cine-MRI was well tolerated in all cases; 'dry' swallow was performed for the 2 patients with clinical aspiration. Tongue base-pharyngeal wall contact was observed in 5 cases. An increased anterior tongue recoil, increased mandibular recoil, increased posterior oropharyngeal wall advancement and an increased laryngeal elevation were observed in 4 cases. One case of a passive 'slide' mechanism was observed. Conclusions: Cine-MRI is a safe, non-invasive technique for the evaluation of the mobility of oral and oropharyngeal structures after free-flap reconstruction of the tongue. For selected cases, it may be complementary to clinical examination for evaluation of dysphagia after surgery and free-flap reconstruction. Further technical advances will be necessary before cine-MRI can replace videofluoroscopy, however.

Hartl, Dana M. [Department of Otolaryngology-Head and Neck Surgery, Institute Gustave Roussy, 39 rue Camille Desmoulins, 94805 Villejuif Cedex (France)], E-mail: dmhartl@aol.com; Kolb, Frederic; Bretagne, Evelyne [Department of Otolaryngology-Head and Neck Surgery, Institute Gustave Roussy, 39 rue Camille Desmoulins, 94805 Villejuif Cedex (France); Bidault, Francois; Sigal, Robert [Department of Radiology, Institut Gustave Roussy, 39 rue Camille Desmoulins, 94805 Villejuif Cedex (France)

2010-01-15

8

Cine-MRI swallowing evaluation after tongue reconstruction  

International Nuclear Information System (INIS)

Objective: To determine the feasibility of cine-MRI for non-invasive swallowing evaluation after surgery for lingual carcinoma with reconstruction using microvascular free flaps. Methods: Ten patients with stage IV carcinoma of the mobile tongue and/or tongue base treated by surgical resection and reconstruction with a free flap were evaluated after an average of 4.3 years (range: 1.5-11 years), using cine-MRI in 'single-shot fast spin echo' (SSFSE) mode. Fiberoptic laryngoscopy of swallowing was performed before MRI to detect aspiration. The tolerance and ability to complete the exam were noted. The mobilities of the oral and pharyngeal structures visualized were evaluated as normal, reduced or increased. Results: Cine-MRI was well tolerated in all cases; 'dry' swallow was performed for the 2 patients with clinical aspiration. Tongue base-pharyngeal wall contact was observed in 5 cases. An increased anterior tongue recoil, increased mandibular recoil, increased posterior oropharyngeal wall advancement and an increased laryngeal elevation were observed in 4 cases. One case of a passive 'slide' mechanism was observed. Conclusions: Cine-MRI is a safe, non-invasive technique for the evaluation of the mobility of oral and oropharyngeal structures after free-flap reconstruction of the tongue. For selected cases, it may be complementary to clinical examination for evaluation of dysphagia after surgery and free-flap reconstruction. Further technical advances will be necessarurther technical advances will be necessary before cine-MRI can replace videofluoroscopy, however.

9

The character of intracardiac hemodynamic changes in healthy volunteers studied by Cine-MRI  

International Nuclear Information System (INIS)

15 healthy volunteers were investigated by MR to study normal intracardiac hemodynamic. Cine-MRI was performed on 1.5 T Magnetom Sp System. Regions of low signal intensity in at least cardiac chamber were found in 93 %. The most frequent finding was a linear area of signal loss along the anterior mitral leaflet during diastole (86 %). The distinction of normal areas of signal loss from pathologic is based on the extent and duration of the flow disturbance. 15 refs.; 3 figs

10

Cine MRI of the thorax in patients with pectus excavatum  

International Nuclear Information System (INIS)

Morphologic and dynamic assessment of respiratory chest kinetics was performed in patients with pectus excavatum deformity (PE) using dynamic MRI: cine MRI. Seven consecutive patients with PE (aged 20.3 years±4.0) and ten healthy volunteers of comparable age underwent real-time cine MRI of the chest during breathing on a 1.5 T MR scanner (Magnetom Sonata, Siemens Medical Systems, Erlangen, Germany) using a standard phased array body coil and a half-Fourier single-shot turbo spin echo sequence (HASTE) for dynamic imaging. During deep inspiration and expiration, single-shot sequences were performed in one slice level over 20 s at a frequency of 1 image/s covering the entire thoracic cage in three orientations. Morphology and chest kinetics in patients with PE were analyzed and compared with normal values, and typical patterns of chest kinetics were noted. Three different types of chest morphology in PE were identified: (1) the generally flattened thoracic cage, (2) the ''tilted'' sternum, and (3) the focally deepened sternum. Three patterns of motion correspond to these morphological types: (1) elevation of the sternum and the anterior thoracic wall, (2) angulated elevation of the parasternal rib cage with persistent deepening of the sternum resembling a ''wing beat'' movement, and (3) increased diaphragmatic movements with limited chest wall dynamics. Cine MRI is an adequate radiation-free diagnostic modality for the dynamic imaging of both chest morphology and chest aging of both chest morphology and chest wall kinetics in patients with PE. The pectus severity index can easily be determined and three typical movement patterns of chest wall kinetics identified. (orig.)

11

Kinematic analysis of the knee joint by cine MRI  

International Nuclear Information System (INIS)

In order to obtain the MR imaging of a moving knee joint, we developed a drive system of the knee. A reciprocating reversible motor with a rope and pulleys drove a knee brace with the knee bending and extending every two seconds. Using photo sensor probe for gating cine acquisition, we got 16-time frames/cycle MR images. Such as articular cartilage, ligaments and synovial fluid, the fine components of a moving knee joint were clearly seen. In a dynamic display, these cine images demonstrated 'actual' movement of the knee joint. Moving joint fluid and defect of anterior cruciate ligament were demonstrated in the case of knee injury. These findings were not seen on static images. Cine MR imaging was also helpful for evaluating the chronic joint disease and ligament reconstruction. Through the use of the present drive system and cine acquisition, dynamic MR imaging of a moving knee joint is clearly demonstrated and it may provide useful information in the kinematic analysis of the normal and pathologic knee. (author)

12

Kinematic analysis of the knee joint by cine MRI  

Energy Technology Data Exchange (ETDEWEB)

In order to obtain the MR imaging of a moving knee joint, we developed a drive system of the knee. A reciprocating reversible motor with a rope and pulleys drove a knee brace with the knee bending and extending every two seconds. Using photo sensor probe for gating cine acquisition, we got 16-time frames/cycle MR images. Such as articular cartilage, ligaments and synovial fluid, the fine components of a moving knee joint were clearly seen. In a dynamic display, these cine images demonstrated 'actual' movement of the knee joint. Moving joint fluid and defect of anterior cruciate ligament were demonstrated in the case of knee injury. These findings were not seen on static images. Cine MR imaging was also helpful for evaluating the chronic joint disease and ligament reconstruction. Through the use of the present drive system and cine acquisition, dynamic MR imaging of a moving knee joint is clearly demonstrated and it may provide useful information in the kinematic analysis of the normal and pathologic knee. (author).

Niitsu, Mamoru; Akisada, Masayoshi; Anno, Izumi; Matsumoto, Kunihiko; Kuno, Shin-ya; Miyakawa, Shunpei (Tsukuba Univ., Ibaraki (Japan). Inst. of Clinical Medicine); Inouye, Tamon; Kose, Katsumi

1989-08-01

13

Cine MRI of the temporomandibular joint in comparison to static MRI and axiography  

International Nuclear Information System (INIS)

Purpose: To evaluate Cine MRI (cMRI) of the temporomandibular joint in comparison to static MRI (sMRI) and axiography. Materials and Methods: In a prospective study with 57 healthy volunteers as well as 33 patients after temporomandibular joint (TMJ) surgery or with severe joint dysfunction, we measured the mobility of both condyle and disc as well as the sagittal angle of condylar inclination with sMRI and cMRI. Measurements and image analysis were performed by a radiologist and a maxillofacial surgeon in consensus. The results of axiography served as standard of reference. Result: Concerning the assessment of the discoligamentous complex, sMRI was superior to cMRI in the patient-group (sensitivity sMRI 85%, cMRI 76%), while no significant difference was found in the volunteer-group (sensitivity sMRI 97.4%, cMRI 98.3%). The results of cMRI and sMRI showed a highly significant correlation with each other, as well as with the axiographic reference tracings (r=0.90). The average mobility of the disc and condyle was 6% and 10% higher in sMRI compared to cMRI (p=0.001) and showed a slightly higher variance (0.043 vs. 0.038). Concerning the condylar inclination angle, both MRI-procedures had the best correlation (r=0.94) with each other and axiography. Conclusion: Real-time MRI of the TMJ is comparable to axiography in its accuracy and is a useful adjunct to conventional static MRI. (orig.)

14

Prostate gland motion assessed with cine-magnetic resonance imaging (cine-MRI)  

International Nuclear Information System (INIS)

Purpose: To quantify prostate motion during a radiation therapy treatment using cine-magnetic resonance imaging (cine-MRI) for time frames comparable to that expected in an image-guided radiation therapy treatment session (20-30 min). Materials and Methods: Six patients undergoing radiation therapy for prostate cancer were imaged on 3 days, over the course of therapy (Weeks 1, 3, and 5). Four hundred images were acquired during the 1-h MRI session in 3 sagittal planes through the prostate at 6-s intervals. Eleven anatomic points of interest (POIs) have been used to characterize prostate/bony pelvis/abdominal wall displacement. Motion traces and standard deviation for each of the 11 POIs have been determined. The probability of displacement over time has also been calculated. Results: Patients were divided into 2 groups according to rectal filling status: full vs. empty rectum. The displacement of POIs (standard deviation) ranged from 0.98 to 1.72 mm for the full-rectum group and from 0.68 to 1.04 mm for the empty-rectum group. The low standard deviations in position (2 mm or less) would suggest that these excursions have a low frequency of occurrence. The most sensitive prostate POI to rectal wall motion was the midposterior with a standard deviation of 1.72 mm in the full-rectum group vs. 0.79 mm in the empty-rectum group (p 0.0001). This POI has a 10% probability of moving more than 3 mm in a time frame of ?1 min if the rectum is full vs. ?20 min if the rectum ium is full vs. ?20 min if the rectum is empty. Conclusion: Motion of the prostate and seminal vesicles during a time frame similar to a standard treatment session is reduced compared to that reported in interfraction studies. The most significant predictor for intrafraction prostate motion is the status of rectal filling. A prostate displacement of <3 mm (90%) can be expected for the 20 min after the moment of initial imaging for patients with an empty rectum. This is not the case for patients presenting with full rectum. The determination of appropriate intrafraction margins in radiation therapy to accommodate the time-dependent uncertainty in positional targeting is a topic of ongoing investigations for the on-line image guidance model

15

Self-gated cardiac Cine MRI of the rat on a clinical 3?T MRI system.  

Science.gov (United States)

The ability to perform small animal functional cardiac imaging on clinical MRI scanners may be of particular value in cases in which the availability of a dedicated high field animal MRI scanner is limited. Here, we propose radial MR cardiac imaging in the rat on a whole-body clinical 3?T scanner in combination with interspersed projection navigators for self-gating without any additional external triggering requirements for electrocardiogram (ECG) and respiration. Single navigator readouts were interspersed using the same TR and a high navigator frequency of 54?Hz into a radial golden-angle acquisition. The extracted navigator function was thresholded to exclude data for reconstruction from inhalation phases during the breathing cycle, enabling free breathing acquisition. To minimize flow artifacts in the dynamic cine images a center-out half echo radial acquisition scheme with ramp sampling was used. Navigator functions were derived from the corresponding projection navigator data from which both respiration and cardiac cycles were extracted. Self-gated cine acquisition resulted in high-quality cardiac images which were free of major artifacts with spatial resolution of up to 0.21?×?0.21?×?1.00?mm(3) and a contrast-to-noise ratio (CNR) of 21?±?3 between the myocardium and left ventricle. Self-gated golden ratio based radial acquisition successfully acquired cine images of the rat heart on a clinical MRI system without the need for dedicated animal ECG equipment. Copyright © 2014 John Wiley & Sons, Ltd. PMID:25417764

Krämer, Martin; Herrmann, Karl-Heinz; Biermann, Judith; Freiburger, Sebastian; Schwarzer, Michael; Reichenbach, Jürgen R

2015-02-01

16

Diagnosis of atrial septal defect by the combined use of spin echo method and cine MRI  

Energy Technology Data Exchange (ETDEWEB)

The purpose of this study is to clarify the usefulness of magnetic resonance imaging (MRI), especially of cine MRI, in the diagnosis of atrial septal defect (ASD) with or without associated anomalies. Thirty patients were studied by MRI and they consisted of 15 patients with ASD and 15 control patients with cardiac disease other than ASD. Horizontal and sagittal sections of the whole heart were obtained using spin-echo sequence (SE) and the multi-phase images of four-chamber plane were obtained using cine MRI. By SE, the defect of interatrial septum was visualized in all 15 patients with ASD, but the similar pattern was also observed in 3 of 15 control patients. By cine MRI, the shunt flow through the defect was visualized as a relatively high signal area accompanied with low signal areas on both sides. When using the criteria of the presence of both the defect and the shunt flow by cine MRI, all of the 15 patients with ASD and the 15 control patients were correctly diagnosed. On the other hand, SE was very useful in the diagnosis of the anomalies associated with ASD, especially in 3 patients with anomalous pulmonary venous drainage. Thus, the combined use of cine MRI with SE is useful for the diagnosis of ASD and its associated anomalies. (author).

Yoshida, Eriko; Mikami, Taisei; Anzai, Teisuke; Fukuda, Hiroyuki; Hashimoto, Masayuki; Hirabayashi, Takayuki; Nishijima, Hirotaka; Yasuda, Hisakazu; Fujita, Nobuyuki (Hokkaido Univ., Sapporo (Japan). School of Medicine)

1990-10-01

17

Temporal analysis of regional wall motion from cine cardiac MRI  

Science.gov (United States)

The purpose of this work is to develop and to evaluate an automatic analysis technique for quantitative assessment of cardiac function from cine MRI and to identify regional alterations in synchronicity based on Fourier analysis of ventricular wall motion (WM). A temporal analysis technique of left ventricular wall displacement was developed for quantitative analysis of temporal delays in wall motion and applied to gated cine 'dark blood' cardiac MRI. This imaging technique allows the user to saturate the blood both above and below the imaging slice simultaneously by using a specially designed rf presaturation pulse. The acquisition parameters are: TR equals 25 - 60 msec, TE equals 5 - 7 msec, 0 equals 25 degrees, slice thickness equals 10 mm, 16 to 32 frames/cycle. Automatic edge detection was used to outline the ventricular cavities on all frames of a cardiac cycle. Two different segmentation techniques were applied to all studies and lead to similar results. Further improvement in edge detection accuracy was achieved by temporal interpolation of individual contours on each image of the cardiac cycle. Radial analysis of the ventricular wall motion was then performed along 64 radii drawn from the center of the ventricular cavity. The first harmonic of the Fourier transform of each radial motion curve is calculated. The phase of the fundamental Fourier component is used as an index of synchrony (delay) of regional wall motion. Results are displayed in color-coded maps of regional alterations in the amplitude and synchrony of wall motion. The temporal delays measured from individual segments are evaluated through a histogram of phase distribution, where the width of the main peak is used as an index of overall synchrony of wall motion. The variability of this technique was validated in 10 normal volunteers and was used to identify regions with asynchronous WM in 15 patients with documented CAD. The standard deviation (SD) of phase distribution measured in short axis views was calculated and used to identify regions with asynchronous wall motion in patients with coronary artery disease. Results suggest that this technique is more sensitive than global functional parameters such as ejection fraction for the detection of ventricular dysfunction. Color coded parametric display offers a more convenient way for the identification and localization of regional wall motion asynchrony. Data obtained from endocardial wall motion analysis were not significantly different from wall thickening measurements. The innovative approach of evaluating the temporal behavior of regional wall motion anomalies is expected to provide clinically relevant data about subtle alteration that cannot be detected through simple analysis of the extent (amplitude) of wall motion or myocardial thickening. Temporal analysis of regional WM abnormality from cine MRI offers an innovative and promising means for objective quantitative evaluation of subtle regional abnormalities. Color coded parametric maps allowed a better identification and localization of regional WM asynchrony.

Ratib, Osman M.; Didier, Dominique; Chretien, Anne; Rosset, Antoine; Magnin, Isabelle E.; Ligier, Yves

1996-04-01

18

Application of cine MRI-tagging method to aortic dessection  

International Nuclear Information System (INIS)

For the evaluation of aortic dissection, ECG-gated SE or cine MR imaging has been usually performed. However, detection of slow flow in the false lumen and differentiation between mural thrombus and slow flow are sometimes difficult. Because paradoxical enhancement due to slow blood flow simulates thrombus. We performed cine MR imaging with persaturation tagging, which clearly showed differentiation between thrombus and paradoxical enhancement. We concluded that cine MR imaging with tagging method was useful to evaluate the slow flow and thrombus in the false lumen. (author)

19

Using learned under-sampling pattern for increasing speed of cardiac cine MRI based on compressive sensing principles  

Science.gov (United States)

This article presents a compressive sensing approach for reducing data acquisition time in cardiac cine magnetic resonance imaging (MRI). In cardiac cine MRI, several images are acquired throughout the cardiac cycle, each of which is reconstructed from the raw data acquired in the Fourier transform domain, traditionally called k-space. In the proposed approach, a majority, e.g., 62.5%, of the k-space lines (trajectories) are acquired at the odd time points and a minority, e.g., 37.5%, of the k-space lines are acquired at the even time points of the cardiac cycle. Optimal data acquisition at the even time points is learned from the data acquired at the odd time points. To this end, statistical features of the k-space data at the odd time points are clustered by fuzzy c-means and the results are considered as the states of Markov chains. The resulting data is used to train hidden Markov models and find their transition matrices. Then, the trajectories corresponding to transition matrices far from an identity matrix are selected for data acquisition. At the end, an iterative thresholding algorithm is used to reconstruct the images from the under-sampled k-space datasets. The proposed approaches for selecting the k-space trajectories and reconstructing the images generate more accurate images compared to alternative methods. The proposed under-sampling approach achieves an acceleration factor of 2 for cardiac cine MRI.

Zamani, Pooria; Kayvanrad, Mohammad; Soltanian-Zadeh, Hamid

2012-12-01

20

Three-dimensional MRI-linac intra-fraction guidance using multiple orthogonal cine-MRI planes  

DEFF Research Database (Denmark)

The introduction of integrated MRI-radiation therapy systems will offer live intra-fraction imaging. We propose a feasible low-latency multi-plane MRI-linac guidance strategy. In this work we demonstrate how interleaved acquired, orthogonal cine-MRI planes can be used for low-latency tracking of the 3D trajectory of a soft-tissue target structure. The proposed strategy relies on acquiring a pre-treatment 3D breath-hold scan, extracting a 3D target template and performing template matching between this 3D template and pairs of orthogonal 2D cine-MRI planes intersecting the target motion path. For a 60 s free-breathing series of orthogonal cine-MRI planes, we demonstrate that the method was capable of accurately tracking the respiration related 3D motion of the left kidney. Quantitative evaluation of the method using a dataset designed for this purpose revealed a translational error of 1.15 mm for a translation of 39.9 mm. We have demonstrated how interleaved acquired, orthogonal cine-MRI planes can be used foronline tracking of soft-tissue target volumes.

Bjerre, Troels; Crijns, Sjoerd

2013-01-01

 
 
 
 
21

Cine MRI of the thorax in patients with pectus excavatum; CINE-MRT des Thorax bei Patienten mit Pectus excavatum  

Energy Technology Data Exchange (ETDEWEB)

Morphologic and dynamic assessment of respiratory chest kinetics was performed in patients with pectus excavatum deformity (PE) using dynamic MRI: cine MRI. Seven consecutive patients with PE (aged 20.3 years{+-}4.0) and ten healthy volunteers of comparable age underwent real-time cine MRI of the chest during breathing on a 1.5 T MR scanner (Magnetom Sonata, Siemens Medical Systems, Erlangen, Germany) using a standard phased array body coil and a half-Fourier single-shot turbo spin echo sequence (HASTE) for dynamic imaging. During deep inspiration and expiration, single-shot sequences were performed in one slice level over 20 s at a frequency of 1 image/s covering the entire thoracic cage in three orientations. Morphology and chest kinetics in patients with PE were analyzed and compared with normal values, and typical patterns of chest kinetics were noted. Three different types of chest morphology in PE were identified: (1) the generally flattened thoracic cage, (2) the ''tilted'' sternum, and (3) the focally deepened sternum. Three patterns of motion correspond to these morphological types: (1) elevation of the sternum and the anterior thoracic wall, (2) angulated elevation of the parasternal rib cage with persistent deepening of the sternum resembling a ''wing beat'' movement, and (3) increased diaphragmatic movements with limited chest wall dynamics. Cine MRI is an adequate radiation-free diagnostic modality for the dynamic imaging of both chest morphology and chest wall kinetics in patients with PE. The pectus severity index can easily be determined and three typical movement patterns of chest wall kinetics identified. (orig.) [German] Morphologische und dynamische Darstellung typischer Bewegungsmuster der Atemmechanik bei Patienten mit Pectus excavatum (PE) mit dynamischer MRT: CINE-MRT. Sieben Patienten mit PE (Alter 20,3 Jahre {+-} 4,0) und 10 gesunde Probanden entsprechenden Alters wurden mit CINE-MRT des Thorax an einem 1,5-T-MRT (Magnetom Sonata, Siemens Medical Systems, Erlangen) untersucht. Bei Verwendung einer Phased-array-Koerperspule und einer Half-Fourier-single-shot-turbo-Spinechosequenz (HASTE) wurden bei tiefer, kontinuierlicher In- und Exspiration Einzelschichtmessungen in allen 3 Raumebenen mit einem Bild/s ueber die Dauer von 20 s angefertigt. Morphologie und Bewegungsmuster des Thorax wurden vergleichend analysiert, und dabei konnten typische Bewegungsabfolgen waehrend des Atemzyklus identifiziert werden. Es konnten 3 morphologische Formen der PE unterschieden werden: Der insgesamt abgeflachte Thorax, das ''gekippte, schraeg gestellte'' Sternum und das ''punktuell eingesunkene'' Sternum. Diesen entsprechen 3 Bewegungsmuster der Atemmechanik des Thorax bei PE: (1) gleichmaessiges Anheben von Sternum und vorderer Brustwand, (2) beidseitig abgewinkeltes Anheben der vorderen Brustwand bei konstant eingesunkenem Sternum (''Fluegelschlagdynamik'') und (3) betontes Absenken des Zwerchfells bei geringer Thoraxexkursion. CINE-MRT ist eine einfache und strahlenfreie Methode zur dynamischen Darstellung der Thoraxatemmechanik bei PE. Individuelle Auspraegung und Schweregrad der Deformitaet koennen zuverlaessig erfasst werden, wobei typische Bewegungsmuster erkennbar sind. (orig.)

Herrmann, K.A.; Zech, C.J.; Schoenberg, S.O.; Reiser, M.F. [Klinikum Grosshadern der Ludwig-Maximilians-Universitaet, Institut fuer Klinische Radiologie, Muenchen (Germany); Strauss, T.; Hatz, R. [Klinikum Grosshadern der Ludwig-Maximilians-Universitaet Muenchen (Germany). Klinik und Poliklinik fuer Chirurgie

2006-04-15

22

Three-dimensional cine MRI in free-breathing infants and children with congenital heart disease  

International Nuclear Information System (INIS)

Patients with congenital heart disease frequently have complex cardiac and vascular malformations requiring detailed non-invasive diagnostic evaluation including functional parameters. To evaluate the morphological and functional information provided by a novel 3-D cine steady-state free-precession (SSFP) sequence. Twenty consecutive children (mean age 2.2 years, nine boys) were examined using a 1.5-T MR system including 2-D cine gradient-recalled-echo sequences, static 3-D SSFP and 3-D cine SSFP sequences. Measurement of ventricular structures and volumes showed close agreement between the 3-D cine SSFP sequence and the 2-D cine gradient-recalled-echo and static 3-D SSFP sequences (left ventricular volumes mean difference 1.0-1.9 ml and 8.8-11.4%, respectively; right ventricular volumes 1.7-2.1 ml and 9.9-16.9%, respectively). No systematic bias was observed. 3-D cine MRI provides anatomic as well as functional information with sufficient spatial and temporal resolution in free-breathing infants with congenital heart disease. (orig.)

23

Three-dimensional cine MRI in free-breathing infants and children with congenital heart disease  

Energy Technology Data Exchange (ETDEWEB)

Patients with congenital heart disease frequently have complex cardiac and vascular malformations requiring detailed non-invasive diagnostic evaluation including functional parameters. To evaluate the morphological and functional information provided by a novel 3-D cine steady-state free-precession (SSFP) sequence. Twenty consecutive children (mean age 2.2 years, nine boys) were examined using a 1.5-T MR system including 2-D cine gradient-recalled-echo sequences, static 3-D SSFP and 3-D cine SSFP sequences. Measurement of ventricular structures and volumes showed close agreement between the 3-D cine SSFP sequence and the 2-D cine gradient-recalled-echo and static 3-D SSFP sequences (left ventricular volumes mean difference 1.0-1.9 ml and 8.8-11.4%, respectively; right ventricular volumes 1.7-2.1 ml and 9.9-16.9%, respectively). No systematic bias was observed. 3-D cine MRI provides anatomic as well as functional information with sufficient spatial and temporal resolution in free-breathing infants with congenital heart disease. (orig.)

Seeger, Achim; Fenchel, Michael C.; Kramer, Ulrich; Bretschneider, Christiane; Doering, Joerg; Claussen, Claus D.; Miller, Stephan [University of Tuebingen (Germany). Department of Diagnostic and Interventional Radiology; Greil, Gerald F. [St. Thomas Hospital, Division of Imaging Sciences, King' s College London (United Kingdom); Martirosian, Petros [University of Tuebingen, Section of Experimental Radiology, Tuebingen (Germany); Sieverding, Ludger [University of Tuebingen, Department of Pediatric Cardiology, Tuebingen (Germany)

2009-12-15

24

Cine MRI of the temporomandibular joint in comparison to static MRI and axiography; Cine-MRT des Kiefergelenks im Vergleich zur konventionellen MRT und Achsiographie  

Energy Technology Data Exchange (ETDEWEB)

Purpose: To evaluate Cine MRI (cMRI) of the temporomandibular joint in comparison to static MRI (sMRI) and axiography. Materials and Methods: In a prospective study with 57 healthy volunteers as well as 33 patients after temporomandibular joint (TMJ) surgery or with severe joint dysfunction, we measured the mobility of both condyle and disc as well as the sagittal angle of condylar inclination with sMRI and cMRI. Measurements and image analysis were performed by a radiologist and a maxillofacial surgeon in consensus. The results of axiography served as standard of reference. Result: Concerning the assessment of the discoligamentous complex, sMRI was superior to cMRI in the patient-group (sensitivity sMRI 85%, cMRI 76%), while no significant difference was found in the volunteer-group (sensitivity sMRI 97.4%, cMRI 98.3%). The results of cMRI and sMRI showed a highly significant correlation with each other, as well as with the axiographic reference tracings (r=0.90). The average mobility of the disc and condyle was 6% and 10% higher in sMRI compared to cMRI (p=0.001) and showed a slightly higher variance (0.043 vs. 0.038). Concerning the condylar inclination angle, both MRI-procedures had the best correlation (r=0.94) with each other and axiography. Conclusion: Real-time MRI of the TMJ is comparable to axiography in its accuracy and is a useful adjunct to conventional static MRI. (orig.) [German] Fragestellung: Evaluation der Cine-MRT (cMRT) des Kiefergelenks im Vergleich zur statischen MRT (sMRT) und Achsiographie. Material und Methode: Bei 57 Probanden und bei 33 Patienten nach operativem Gelenkeingriff oder mit klinischer Funktionsstoerung wurden die Kondylus- und Diskusmobilitaet sowie die horizontale Kondylenbahnneigung (HKN) in der sMRT und in der cMRT bestimmt. Die Auswertung erfolgte durch einen Radiologen und einen Mund-Kiefer-Gesichtschirurgen im Konsensus. Die Werte der Achsiographie dienten als Goldstandard. Ergebnisse: Bezueglich der Abgrenzbarkeit des diskoligamentaeren Komplexes war in der Gruppe der funktionsgestoerten Gelenke die sMRT der cMRT ueberlegen (Sensitivitaet sMRT 85%, cMRT 76%), waehrend sich bei den Probanden kein signifikanter Unterschied zeigte (Sensitivitaet sMRT 97,4%, cMRT 98,3%). Die in der sMRT und cMRT ermittelten Funktionsdaten korrelierten signifikant untereinander sowie auch mit den entsprechenden achsiographischen Referenzwerten (r=0,90). In der sMRT stellte sich die durchschnittliche Diskus- und Kondylusmobilitaet 6% bzw. 10% hoeher als in der cMRT (p=0,001) bei leicht hoeherer Varianz (v=0,043 vs 0,38) dar. Die HKN-Werte stimmten in beiden MRT-Verfahren und mit der Achsiographie mit jeweils r=0,94 am besten ueberein. Schlussfolgerung: Die Cine-MRT ist in ihrer Genauigkeit mit der Achsiographie vergleichbar und stellt als dynamische Untersuchung eine wertvolle Ergaenzung zur konventionellen statischen MRT dar. (orig.)

Beer, A.; Rummeny, E.J. [Inst. fuer Roentgendiagnostik der Technischen Univ. Muenchen, Klinikum rechts der Isar (Germany); Kolk, A.; Neff, A. [Klinik und Poliklinik fuer Mund-Kiefer-Gesichtschirurgie der Technischen Univ. Muenchen, Klinikum rechts der Isar (Germany); Hof, N. [Abt. fuer Diagnostische und Interventionelle Radiologie/Nuklearmedizin, Krankenhaus Dritter Orden, Muenchen-Nymphenburg (Germany); Treumann, T. [Roentgeninstitut, Kantonshospital Luzern (Switzerland)

2004-04-01

25

Cardiac Metastasis from Invasive Thymoma Via the Superior Vena Cava: Cardiac MRI Findings  

International Nuclear Information System (INIS)

Cardiac tumors are rare, and metastatic deposits are more common than primary cardiac tumors. We present cardiac magnetic resonance imaging (MRI) findings of a 50-year-old woman with invasive thymoma. Cardiac MRI revealed a heterogeneous, lobulated anterior mediastinal mass invading the superior vena cava and extending to the right atrium. In cine images there was no invasion to the right atrial wall.

26

Functional imaging of murine hearts using accelerated self-gated UTE cine MRI.  

Science.gov (United States)

We introduce a fast protocol for ultra-short echo time (UTE) Cine magnetic resonance imaging (MRI) of the beating murine heart. The sequence involves a self-gated UTE with golden-angle radial acquisition and compressed sensing reconstruction. The self-gated acquisition is performed asynchronously with the heartbeat, resulting in a randomly undersampled kt-space that facilitates compressed sensing reconstruction. The sequence was tested in 4 healthy rats and 4 rats with chronic myocardial infarction, approximately 2 months after surgery. As a control, a non-accelerated self-gated multi-slice FLASH sequence with an echo time (TE) of 2.76 ms, 4.5 signal averages, a matrix of 192 × 192, and an acquisition time of 2 min 34 s per slice was used to obtain Cine MRI with 15 frames per heartbeat. Non-accelerated UTE MRI was performed with TE = 0.29 ms, a reconstruction matrix of 192 × 192, and an acquisition time of 3 min 47 s per slice for 3.5 averages. Accelerated imaging with 2×, 4× and 5× undersampled kt-space data was performed with 1 min, 30 and 15 s acquisitions, respectively. UTE Cine images up to 5× undersampled kt-space data could be successfully reconstructed using a compressed sensing algorithm. In contrast to the FLASH Cine images, flow artifacts in the UTE images were nearly absent due to the short echo time, simplifying segmentation of the left ventricular (LV) lumen. LV functional parameters derived from the control and the accelerated Cine movies were statistically identical. PMID:25204261

Motaal, Abdallah G; Noorman, Nils; de Graaf, Wolter L; Hoerr, Verena; Florack, Luc M J; Nicolay, Klaas; Strijkers, Gustav J

2015-01-01

27

[Quantification of mitral regurgitation by cine-MRI. Comparison with transesophageal echocardiography in 45 patients].  

Science.gov (United States)

Cine-MRI demonstrates the presence of mitral regurgitation by a signal void. This study was undertaken to assess the value of this method for quantification of mitral regurgitation in a population not excluding either patients with mitral valve prostheses or those with atrial fibrillation. The subjects included had a mean age of 59 years and were referred for transoesophageal echocardiography, either for assessment of valvular heart disease (38 patients), or for detection of atrial thrombosis before external electrical cardioversion (7 patients). Eight patients had mitral valve prostheses and 19 were in atrial fibrillation. Cine-MRI was performed within 12 days of the transoesophageal echocardiography study with a 1.5 tesla magnet, using a sequence of gradient echo in 3 parallel planes in the 4 chamber view. The regurgitation was quantified by MRI from the extension of the signal void in the left atrium. The transoesophageal Doppler echocardiographic criteria were the width of the regurgitant jet at its origin, the intensity of the regurgitation signal recorded by continuous wave Doppler and the extension of the jet within the left atrium. The quantification by degrees 1 to 4 did not differ by more than 1 degree between the 2 techniques in 43 of the 45 patients. Out of 4 left atrial thrombus detected by transoesophageal echocardiography, only 1 was visible by MRI. The authors concluded that quantification of mitral regurgitation by cine-MRI provides similar results to those obtained by transoesophageal echocardiography and that the correlation remains valid in cases of atrial fibrillation. However, Doppler echocardiography provides further valuable information for the clinician. PMID:9539819

Ambrosi, P; Habib, G; Ferracci, A; Faugère, G; Luccioni, R; Bernard, P J

1997-11-01

28

MRI Findings In Dengue Encephalitis  

Directory of Open Access Journals (Sweden)

Full Text Available Neurological manifestations are rare in dengue fever. Two cases with encephalopathy and systemic features of dengue fever with abnormal CSF and MR imaging are reported. Striking MRI finding was bilateral symmetrical thalamic lesions similar to those reported in Japanese encephalitis. This report highlights that MRI findings can be similar in dengue and Japanese encephalitis.

Ashraf V.V

2004-01-01

29

Automatic synthesis of cine viability MRI images for evaluation of coronary heart disease.  

Science.gov (United States)

Coronary heart disease (CHD) is the leading cause of death worldwide. Cardiac magnetic resonance imaging (MRI) is a valuable imaging modality, as it can noninvasively provide information about myocardial function, viability, and morphology. Viability delayed-enhancement (DE) images are acquired at a single timeframe while myocardial functional (tagged) images are acquired as a cine loop of timeframes throughout the cardiac cycle. In this work, we propose a method for estimating DE images at all timeframes in the cardiac cycle without additional scan time to show both viability and functional information in the same image. The method is based on generating a dense motion field of the heart from the acquired tagged images, and then applying the extracted field to the acquired DE image. The developed technique is accurate in generating cine DE images and providing simultaneous information about myocardial viability and wall motion for comprehensive patient evaluation and optimal treatment selection. PMID:25571144

Hassanein, Azza S; Khalifa, Ayman M; Al-Atabany, Walid; El-Wakad, Mohamed T; Shapiro, Brian; Ibrahim, El-Sayed H

2014-08-01

30

Treatment and diagnosis of middle fossa arachnoid cyst. Ventriculofiberscopy and cine-MRI  

International Nuclear Information System (INIS)

The treatment of intracranial arachnoid cysts is controversial regarding its surgical indication and operative procedures. Conventional surgical approaches such as fenestration, membranectomy, and shunting operation are invasive. Also CT cisternography and/or RI cisternography are invasive, when it has been performed to evaluate the possible CSF communications between the arachnoid cyst and subarachnoid space. Between July 1994 and February 1997, 10 patients with intracranial middle fossa arachnoid cysts were treated with a newly developed ventriculofiberscope which is characterized by splendid mechanical flexibility and high resolution. The cine-MRI, which is a non-invasive diagnostic tool, is used to evaluate the CSF circulation around the cyst fenestration. The patients' ages ranged from 4 months to 10 years, with a mean of 4.46 years. The cyst locations were left middle fossa (9), and right (1). Eight patients presented with macrocrania, 4 with developmental delay, three with seizure, two with headache, and one with subdural hematoma. The patients were preoperatively evaluated by means of MRI and cine-MR images. In all patients ventriculofiberscopic procedures including cyst fenestration, membranous dissection, cyst puncture and shriveling were successfully performed. Postoperative MR and cine-MR studies have shown reduction of the cyst size and appropriate CSF circulation. Neuroendoscopic procedures seem to be the first choice for children with arachnoid cysts anhoice for children with arachnoid cysts and the ventriculofiberscope proved to be very useful not only for cyst fenestration but also for cyst dissection. In addition, the non-invasive cine-MR studies are useful for long follow-up at OPD. (author)

31

Stress cine MRI for detection of coronary artery disease  

International Nuclear Information System (INIS)

Stress testing is the cornerstone in the diagnosis of patients with suspected coronary artery disease (CAD). Stress echocardiography has become a well-established modality for the detection of ischemia-induced wall motion abnormalities. However, display and reliable interpretation of stress echocardiography studies are user-dependent, the test reproducibility is low, and 10 to 15% of patients yield suboptimal or non-diagnostic images. Due to its high spatial and contrast resolution, MRI is known to permit an accurate determination of left ventricular function and wall thickness at rest. Early stress MRI studies provided promising results with respect to the detection of CAD. However, the clinical impact was limited due to long imaging time and problematic patient monitoring in the MRI environment. Recent technical improvements - namely ultrafast MR image acquisition - led to a significant reduction of imaging time and improved patient safety. Stress can be induced by physical exercise or pharmacologically by administration of a beta1-agonist (dobutamine) or vasodilatator (dipyridamole and adenosine). The best developed and most promising stress MRI technique is a high-dose dobutamine/atropine stress protocol (10, 20, 30, 40 ?g/kg/min; optionally 0.25-mg fractions of atropine up to maximal dose 1 mg). Severe complications (myocardial infarction, ventricular fibrillation and sustained tachycardia, cardiogenic shock) may be expected in 0.25% of patients. Curray be expected in 0.25% of patients. Currently, data of three high-dose dobutamine stress MRI studies are available, revealing a good sensitivity (83 - 87%) and specificity (83 - 86%) in the assessment of CAD. The direct comparison between echocardiography and MRI for the detection of stress-induced wall motion abnormalities yielded better results for dobutamine-MRI in terms of sensitivity (86.2% vs. 74.3%; p < 0.05) and specificity (85.7% vs. 69.8% p < 0.05) as compared to dobutamine stress echocardiography. The superior results of MRI can mainly be explained by the better image quality with sharp delineation of the endocardial and epicardial borders. Currently, stress MRI is already a realistic clinical alternative for the non-invasive assessment of CAD in patients with impaired image quality in echocardiography. (orig.)

32

MRI findings following laparoscopic sacrocolpopexy  

Energy Technology Data Exchange (ETDEWEB)

Sacrocolpopexy is a surgical procedure that provides effective treatment for pelvic prolapse. The surgical technique and complications of laproscopic sacrocolpopexy are described. This review presents experience of MRI for postoperative assessment and illustrates normal and abnormal findings.

Schofield, M.L.A. [Department of Radiology, Waikato Hospital, Hamilton (New Zealand); Higgs, P. [Department of Gynaecology, Manchester Royal Infirmary, Central Manchester and Manchester Childrens University Hospital, Oxford Road, Manchester (United Kingdom); Hawnaur, J.M. [Department of Radiology, Manchester Royal Infirmary, Central Manchester and Manchester Childrens University Hospital, Oxford Road, Manchester (United Kingdom)]. E-mail: jhawnaur@hotmail.com

2005-03-01

33

Cine MRI for quantifying regurgitant lesions using a volume method  

International Nuclear Information System (INIS)

We have examined 46 patients with angiographically confirmed regurgitant lesions (26 mitral insufficiency, 20 aortic insufficiency) using a 0.5 Tesla magnet. In each patient, mulit-plane and multi-phase spin-echo sequences were obtained in a plane angled in the sagittal and coronal direction in the long axis of the heart; left and right ventricular volumes, ejection fractions and regurgitation fractions were calculated. In addition, a blood-flow sensitive gradient echo sequence was obtained in order to determine the direction and extent of the regurgitant jet. The data was compared with the results of angiography and echo-cardiography. By means of the gradient echo technique, MRI was able to show the regurgitant jet in every patient. There was a linear correlation between volumes determined by MRI and angiography. The best agreement was found for left ventricular contraction volume (R = 0.82, p is <0.0001). Comparison of the non-invasive and angiographic method showed a linear correlation for AI patients of R = 0.91 (p is <0.0001), which is somewhat better than for patients with MI (R = 0.84, p <0.001). Seme-quantitative grading of MI with a gradient echo technique showed a linear correlation with angiography of R = 0.73 (p <0.001), for AI there was agreement between both methods in 72% of cases. A comparison between MRI and colour Doppler sonography showed only moderately good correlation R = 0.69 (p<0.01). (orig.)

34

Rabies, encephalomyelitis: MRI findings  

International Nuclear Information System (INIS)

The authors present a 14 year old patient who started with walking and swallowing difficulty; followed by fever, abdominal and lower back pain. Mechanical breathing difficulties required a respiratory mechanic assistance. The diagnosis of Guillain-Barre syndrome was thought at first. Since the patient have had previous contact with a bat two months before the symptoms began, this suggested rabies as the main diagnosis, which was later confirmed by hair-bulb, cornea, oral mucosa and salival immunofluorescence. The brain and spinal cord MRI showed focal lesions in T2 and FLAIR sequences, compatible with encephalomyelitis. (author)

35

MRI findings in Hirayama disease  

Directory of Open Access Journals (Sweden)

Full Text Available The objective of the study was to study the magnetic resonance imaging (MRI features of Hirayama disease on a 3 Tesla MRI scanner. Nine patients with clinically suspected Hirayama disease were evaluated with neutral position, flexion, contrast-enhanced MRI and fast imaging employing steady-state acquisition (FIESTA sequences. The spectrum of MRI features was evaluated and correlated with the clinical and electromyography findings. MRI findings of localized lower cervical cord atrophy (C5-C7, abnormal curvature, asymmetric cord flattening, loss of attachment of the dorsal dural sac and subjacent laminae in the neutral position, anterior displacement of the dorsal dura on flexion and a prominent epidural space were revealed in all patients on conventional MRI as well as with the dynamic 3D-FIESTA sequence. Intramedullary hyperintensity was seen in four patients on conventional MRI and on the 3D-FIESTA sequence. Flow voids were seen in four patients on conventional MRI sequences and in all patients with the 3D-FIESTA sequence. Contrast enhancement of the epidural component was noted in all the five patients with thoracic extensions. The time taken for conventional and contrast-enhanced MRI was about 30-40 min, while that for the 3D-FIESTA sequence was 6 min. Neutral and flexion position MRI and the 3D-FIESTA sequence compliment each other in displaying the spectrum of findings in Hirayama disease. A flexion study should form an essential part of the screening protocol in patients with suspected Hirayama disease. Newer sequences such as the 3D-FIESTA may help in reducing imaging time and obviating the need for contrast.

Raval Monali

2010-01-01

36

Tailgut cysts: MRI findings.  

Science.gov (United States)

Magnetic resonance imaging (MRI) features of 11 surgically resected pelvic tailgut cysts were analyzed with reference to histopathologic and clinical data. Homogeneity, size, location, signal intensity, appearance and presence of septa and/or nodules and/or peripheral rim and involvement of surrounding structures were studied. Histological examination demonstrated 11 tailgut cysts (TGC), including one infected TGC and one TGC with a component of adenocarcinoma. Lesions (3-8 cm in diameter) were exclusively or partly retrorectal in all cases but one, with an extension down the anal canal in five cases. Lesions were multicystic in all patients but one. On T1-weighted MR images, all cystic lesions contained at least one hyperintense cyst. The peripheral rim of the cystic lesion was regular and non or moderately enhancing in all cases but the two complicated TGC. Nodular peripheral rim and irregular septa were seen in the degenerated TGC. Marked enhancement of the peripheral structures was noted in the two complicated TGC. Pelvic MRI is a valuable tool in the preoperative evaluation of TGC. PMID:18566821

Aflalo-Hazan, V; Rousset, P; Mourra, N; Lewin, M; Azizi, L; Hoeffel, C

2008-11-01

37

Tailgut cysts: MRI findings  

Energy Technology Data Exchange (ETDEWEB)

Magnetic resonance imaging (MRI) features of 11 surgically resected pelvic tailgut cysts were analyzed with reference to histopathologic and clinical data. Homogeneity, size, location, signal intensity, appearance and presence of septa and/or nodules and/or peripheral rim and involvement of surrounding structures were studied. Histological examination demonstrated 11 tailgut cysts (TGC), including one infected TGC and one TGC with a component of adenocarcinoma. Lesions (3-8 cm in diameter) were exclusively or partly retrorectal in all cases but one, with an extension down the anal canal in five cases. Lesions were multicystic in all patients but one. On T1-weighted MR images, all cystic lesions contained at least one hyperintense cyst. The peripheral rim of the cystic lesion was regular and non or moderately enhancing in all cases but the two complicated TGC. Nodular peripheral rim and irregular septa were seen in the degenerated TGC. Marked enhancement of the peripheral structures was noted in the two complicated TGC. Pelvic MRI is a valuable tool in the preoperative evaluation of TGC. (orig.)

Aflalo-Hazan, V.; Rousset, P.; Lewin, M.; Azizi, L. [Hopital Saint Antoine, Department of Radiology, PARIS Cedex 12 (France); Mourra, N. [Hopital Saint Antoine, Department of Pathology, PARIS Cedex 12 (France); Hoeffel, C. [Hopital Robert Debre, Department of Radiology, Reims Cedex (France)

2008-11-15

38

Tailgut cysts: MRI findings  

International Nuclear Information System (INIS)

Magnetic resonance imaging (MRI) features of 11 surgically resected pelvic tailgut cysts were analyzed with reference to histopathologic and clinical data. Homogeneity, size, location, signal intensity, appearance and presence of septa and/or nodules and/or peripheral rim and involvement of surrounding structures were studied. Histological examination demonstrated 11 tailgut cysts (TGC), including one infected TGC and one TGC with a component of adenocarcinoma. Lesions (3-8 cm in diameter) were exclusively or partly retrorectal in all cases but one, with an extension down the anal canal in five cases. Lesions were multicystic in all patients but one. On T1-weighted MR images, all cystic lesions contained at least one hyperintense cyst. The peripheral rim of the cystic lesion was regular and non or moderately enhancing in all cases but the two complicated TGC. Nodular peripheral rim and irregular septa were seen in the degenerated TGC. Marked enhancement of the peripheral structures was noted in the two complicated TGC. Pelvic MRI is a valuable tool in the preoperative evaluation of TGC. (orig.)

39

MRI findings in bipartite patella  

Energy Technology Data Exchange (ETDEWEB)

Bipartite patella is a known cause of anterior knee pain. Our purpose was to detail the magnetic resonance imaging (MRI) features of bipartite patella in a retrospective cohort of patients imaged at our institution. MRI exams from 53 patients with findings of bipartite patella were evaluated to assess for the presence of bone marrow edema within the bipartite fragment and for the presence of abnormal signal across the synchondrosis or pseudarthrosis. Any other significant knee pathology seen at MRI was also recorded. We also reviewed 400 consecutive knee MRI studies to determine the MRI prevalence of bipartite patella. Of the 53 patients with bipartite patella 40 (75%) were male; 35 (66%) had edema within the bipartite fragment. Of the 18 with no edema an alternative explanation for knee pain was found in 13 (72%). Edema within the bipartite fragment was the sole finding in 26 of 53 (49%) patients. Bipartite patella was seen in 3 (0.7%) of 400 patients. In patients with bipartite patella at knee MRI, bone marrow edema within the bipartite fragment was the sole finding on knee MRI in almost half of the patients in our series. (orig.)

Kavanagh, Eoin C. [University of Pittsburgh Medical Centre, Department of Radiology, Pittsburgh, PA (United States); Zoga, Adam; Omar, Imran [Thomas Jefferson University Hospital, Department of Radiology, Philadelphia, PA (United States); Ford, Stephanie; Eustace, Stephen [Cappagh National Orthopaedic Hospital, Department of Radiology, Dublin (Ireland); Schweitzer, Mark [Hospital for Joint Disease, Orthopedic Institute, Department of Radiology, New York, NY (United States)

2007-03-15

40

MRI findings in bipartite patella  

International Nuclear Information System (INIS)

Bipartite patella is a known cause of anterior knee pain. Our purpose was to detail the magnetic resonance imaging (MRI) features of bipartite patella in a retrospective cohort of patients imaged at our institution. MRI exams from 53 patients with findings of bipartite patella were evaluated to assess for the presence of bone marrow edema within the bipartite fragment and for the presence of abnormal signal across the synchondrosis or pseudarthrosis. Any other significant knee pathology seen at MRI was also recorded. We also reviewed 400 consecutive knee MRI studies to determine the MRI prevalence of bipartite patella. Of the 53 patients with bipartite patella 40 (75%) were male; 35 (66%) had edema within the bipartite fragment. Of the 18 with no edema an alternative explanation for knee pain was found in 13 (72%). Edema within the bipartite fragment was the sole finding in 26 of 53 (49%) patients. Bipartite patella was seen in 3 (0.7%) of 400 patients. In patients with bipartite patella at knee MRI, bone marrow edema within the bipartite fragment was the sole finding on knee MRI in almost half of the patients in our series. (orig.)

 
 
 
 
41

Hemodynamic assessment in a child with renovascular hypertension using time-resolved three-dimensional cine phase-contrast MRI.  

Science.gov (United States)

Renovascular hypertension (RVH) is an important cause of hypertension in children. It is essential to assess the hemodynamics of RVH lesions in detail. We herein report the case of a 9-year-old female with RVH caused by left renal artery stenosis in which the hemodynamics of the lesions were assessed with time-resolved three-dimensional cine phase-contrast MRI (3D cine PC MRI) with a vastly undersampled 3D radial projection imaging trajectory before and after percutaneous transluminal renal angioplasty (PTRA). The utility of 3D cine PC MRA for diagnosing RVH and evaluating the renal blood flow pre- and post-PTRA is presented. J. Magn. Reson. Imaging 2015;41:165-168. © 2014 Wiley Periodicals, Inc. PMID:24615925

Ishikawa, Takamichi; Takehara, Yasuo; Yamashita, Shuhei; Iwashima, Satoru; Sugiyama, Masataka; Wakayama, Tetsuya; Johnson, Kevin; Wieben, Oliver; Sakahara, Harumi; Ogata, Tsutomu

2015-01-01

42

Frequency analyses of CSF flow on cine MRI in normal pressure hydrocephalus  

International Nuclear Information System (INIS)

Our objective was to clarify intracranial cerebrospinal fluid (CSF) flow dynamics in normal-pressure hydrocephalus (NPH). Frequency analyses of CSF flow measured with phase-contrast cine MRI were performed. The CSF flow spectra in the aqueduct were determined in patients (n=51) with NPH, brain atrophy or asymptomatic ventricular dilation (VD), and in healthy volunteers (control group; n=25). The changes in CSF flow spectra were also analyzed after intravenous injection of acetazolamide. Moreover, a phase transfer function (PTF) calculated from the spectra of the driving vascular pulsation and CSF flow in the aqueduct were assessed. These values were compared with the pressure volume response (PVR). The amplitude in the NPH group was significantly larger than that in the VD or control group because of a decrease in compliance. The phase in the NPH group was significantly different from that in either the VD or the control group, but no difference was found between the VD and control groups. The amplitude increased in all groups after acetazolamide injection. The PTF in the NPH group was significantly larger than in the control group, and a positive correlation was noted between PTF and PVR. Frequency analyses of CSF flow measured by cine MRI make it possible to noninvasively obtain a more detailed picture of the pathophysiology of NPH. (orig.)

43

MRI findings of intraocular diseases  

Energy Technology Data Exchange (ETDEWEB)

MRI findings of intra-ocular lesion were studied on seven cases : two cases of choroidal malignant melanoma, one case of choroidal tumor, two cases of retinal detachment with vitreous hemorrhage, and two cases of choroidal detachment. Intraocular lesions were clearly visualized by T{sub 1} weighted MRI which was of great benefit in visualizing morphological changes. T{sub 2} weighted images could not visualize morphological changes very well, but had some merits in differentiating the ocular pathology. MRI was a very useful examination for intra-ocular lesions. (author).

Takeda, Makoto; Nagai, Haruhiko; Ueno, Tetsuji; Igarashi, Yasuo (Sapporo Medical Coll. (Japan)); Narazaki, Yoshikazu; Takeda, Akira

1989-06-01

44

Visualization and quantification of large bowel motility with functional cine-MRI  

International Nuclear Information System (INIS)

Purpose: to develop and evaluate a method to visualize and quantify large bowel motility using functional cine MRI. Methods: fifteen healthy individuals (8males, 7 females, 20 to 45 years old) with no history or present symptoms of bowel disorders were enrolled in a functional cine MRI examination at 6 a. m. after a starving phase for at least eight hours before and after oral administration of Senna tea (mild stimulating purgative). Two consecutive sets of repeated measurements of the entire abdomen were performed using a 1.5T MRI system with coronal T2-weighted HASTE sequences anatomically adjusted to the course of the large bowel. A navigator technique was used for respiratory gating at the level of the right dorsal diaphragm. The changes in diameter (given in cm) were measured at 5 different locations of the ascending (AC), transverse (TC) and descending colon (DC), and assessed as parameters for the bowel motility. Results: the mean values as a statistical measure for large bowel relaxation were determined. Before ingestion of Senna tea, the mean diameter measured 3.41 cm (ascending colon), 3 cm (transverse colon) and 2.67 cm (descending colon). After the ingestion of Senna tea, the mean diameter increased to 3.69 cm (ascending colon) to 3.4 cm (transverse colon) and to 2.9 cm (descending colon). A statistically significant difference was demonstrated with the Wilcoxon test (level of confidence 0.05). For the determination of dynamic increase, the changes of the n of dynamic increase, the changes of the statistical scatter amplitude to the mean value were expressed as percentage before and after the ingestion of Senna tea. Thereby, an increase in variation and dynamic range was detected for the AC (112.9%) and DC (100%), but a decrease in the dynamics for the TC (69%). Conclusion: a non-invasive method for the assessment of bowel motility was developed for the first time. The use of functional cine MRI utilizing a prokinetic stimulus allowed visualisation and quantification of large bowel motility. Further studies have to determine whether this technique is clinically relevant. (orig.)

45

MRI findings of Intracranial hemangioblastoma  

International Nuclear Information System (INIS)

Complete resection of the tumor nodule (mural nodule or solid portion of the tumor) is the essential goal of surgical treatment for hemangioblastoma. The purpose of this study was to classify the morphologic types of intracranial hemangioblastoma on MRI and to compare the location and contour of tumor nodule on MRI with those on angiography. The MRI findings of 34 lesions (38 lesions if 4 spinal cord lesions were included) in 26 patients (17 males and 9 females, range of age, 18-67 years, mean, 39 years) with surgically and histopathologically proved intracranial hemangioblastomas were reviewed. Seventeen patients underwent CT scanning in a short interval. Contrast-enahnced T1-weighted imaging patterns of hemangioblastoma were classified according to Ho's morphologic types. The location and contour of tumor nodule were compared between MRI and angiography in 15 patients (24 lesions). By location, cerebellar hemisphere predominated (55%), followed by cerebellar vermis (26%), supratentorial region (5%), and medulla oblongata (3%). Spinal cord lesions (11%) were seen in 3 patients of 5 von Hippel-Lindau diseases. The frequency of morphologic types was as follows; Type 1 (purely cystic), 3%, Type 2 (mural nodule), 50%, Type 3 (cyst with wall enhancement), 3%, Type 4 (cystic nodule), 15%, Type 5 (solid with internal cyst), 9%, and Type 6 (solid), 20%. All tumor nodules (33 lesions) enhanced intensely with intravenous contrast material on MRI, of which 24 lesions (in 15 patial on MRI, of which 24 lesions (in 15 patients) revealed hypervascular masses fed by pial arteries on angiography. They were superficial and abutted pia mater partially or in large portion on both MRI and angiography. Over 70% of intracranial hemangioblastomas had a surrounding cyst, and superficial, pial-based location and number of the tumor nodules on MRI was correlated well with those on angiography. MRI is the examination of choice for preoperative evaluation of intracranial hemangioblastoma

46

MRI findings of orbital mass  

International Nuclear Information System (INIS)

A total of 41 cases (17 pseudotumor, 11 lymphoma, 4 cavernous hemangioma, and 9 others) with a orbital mass (es), who underwent MRI, are the basis of this study. The 14 MRI findings (size, shape, signal intensity, etc.) were retrospectively analyzed. Subjective rating score of irregular undulation, homogeneity of signal intensity (SI) on T1WI and SI on (fat-sat) T2WI of cavernous hemangioma was significantly higher than that of pseudotumor. Subjective rating score of irregular undulation, SI on (fat-sat) T2WI and homogeneity of SI on (fat-sat) T2WI of cavernous hemangioma was significantly higher than that of lymphoma. Subjective rating score of lymphoma was significantly higher than that of pseudotumor. There was no significant difference in age, sex and subjective rating score of 9 MRI findings (size, shape, etc). (author)

47

Evaluation of left ventricular aneurysms before and after surgery using cine-MRI  

International Nuclear Information System (INIS)

Purpose: To demonstrate the usefulness of cine-MRI for the evaluation of apical left ventricular aneurysms (ALVA) and for prediction of the surgical outcome. Materials and Methods: We investigated 28 patients with ALVA, 13 of them additionally after aneurysmectomy at 1.5 T; 15 healthy volunteers served as normal controls. For cine-MRI k-space segmented FI-2D-GE sequences were used. Analysis comprised the calculation of cardiac volume indices, cardiac function, and percentual myocardial thickening (PMT). For prediction of surgical results we divided left ventricle into an aneurysmatic and a non-aneurysmatic part. The non-aneurysmatic part was assumed as the left ventricle after surgical remodelling. Results: Enddiastolic and endsystolic volume indices (EDVIs and LV-ESVIs) were higher in patients with ALVA (123.7±30.2 ml/m2, 94.3±32.5 ml/m2, respectively) than in volunteers (79.1±13.9 ml/m2, 25.5±5.1 ml/m2, respectively) (p2; 2.2±0.8 vs. 3.9±0.9 l/min/m2, 26.0±9.7 vs. 67.9±4.5%, respectively) (p2, 66.3±28.0 ml/m2, respectively) (p=0,002, p2) (p>0.05) and a significant i (p>0.05) and a significant increase of CIs and EFs (3.0±0.6 l/min/m2, 37.91±10.15%, respectively) (p<0.001) after surgery. We found a good correlation between the preoperatively calculated (32.6±10.1%) and the measured EF after surgery (37.9±9.8%) (r=0.70; p=0.035). PMT was significantly lower in patients than in volunteers (median 11.9±10.7 vs. 70.2±13.9%; p<0.001), especially in the aneurysmatic parts of left ventricle (median -6.8%; p<0.001). Conclusion: Cine-MRI offers accurate evaluation of ALVA and enables preoperative estimation of left-ventricular volumes after surgery. (orig.)

48

Rhombencephalosynapsis: CT and MRI findings  

Directory of Open Access Journals (Sweden)

Full Text Available An unusual disorder of cerebellar development, rhombencephalosynapsis is a unique entity which presents with cerebellar fusion and absence of cerebellar vermis on imaging studies, often associated with supratentorial findings. No specific clinical syndrome has been described in these patients so far, and most cases are found in infancy and childhood. MRI and its multiplanar capabilities and high spatial and contrast resolution increased its recognition. Two cases are reported, with emphasis on imaging findings.

Mendonça J

2004-01-01

49

Application of the Karhunen-Loeve transform temporal image filter to reduce noise in real-time cardiac cine MRI  

International Nuclear Information System (INIS)

Real-time dynamic magnetic resonance imaging (MRI) typically sacrifices the signal-to-noise ratio (SNR) to achieve higher spatial and temporal resolution. Spatial and/or temporal filtering (e.g., low-pass filtering or averaging) of dynamic images improves the SNR at the expense of edge sharpness. We describe the application of a temporal filter for dynamic MR image series based on the Karhunen-Loeve transform (KLT) to remove random noise without blurring stationary or moving edges and requiring no training data. In this paper, we present several properties of this filter and their effects on filter performance, and propose an automatic way to find the filter cutoff based on the autocorrelation of the eigenimages. Numerical simulation and in vivo real-time cardiac cine MR image series spanning multiple cardiac cycles acquired using multi-channel sensitivity-encoded MRI, i.e., parallel imaging, are used to validate and demonstrate these properties. We found that in this application, the noise standard deviation was reduced to 42% of the original with no apparent image blurring by using the proposed filter cutoff. Greater noise reduction can be achieved by increasing the length of the image series. This advantage of KLT filtering provides flexibility in the form of another scan parameter to trade for SNR.

50

MRI Findings in Knee Trauma  

Directory of Open Access Journals (Sweden)

Full Text Available   "nMRI is the examination of choice for the evaluation of knee trauma. The use of a surface coil and thin-section high resolution scanning techniques in multiple planes has enhanced the depiction of structural details. This article reviews the MRI appearance of the normal knee anatomy and the role of MRI in the evaluation of knee trauma. The suggested protocol for the imaging of traumatic knee is coronal, sagittal and axial fast spin echo. At least one fat suppression sequence should be performed to rescale the contrast range and increase the conspicuity of soft tissue edema, fluid collection and bone marrow edema. The sagittal plane is generally the most effective for reviewing the internal derangement of the knee. Coronal imaging is necessary for the evaluation of the medial and lateral collateral ligament complex and axial imaging depicts the patellofemoral joint best. A meniscal tear is identified by an intrameniscal signal which extends to the joint surface. Tears in the anterior cruciate, posterior cruciate and collateral ligaments are also depicted. In this article we also evaluate the MRI findings of 100 patients with knee trauma and report the incidence of injury to different parts of the joint. The most common findings are joint effusion, meniscal injury and ACL tear. Some interesting cases of knee injuries are also shown.  

Maryam Barzin

2009-01-01

51

Rhombencephalosynapsis: CT and MRI findings  

Digital Repository Infrastructure Vision for European Research (DRIVER)

An unusual disorder of cerebellar development, rhombencephalosynapsis is a unique entity which presents with cerebellar fusion and absence of cerebellar vermis on imaging studies, often associated with supratentorial findings. No specific clinical syndrome has been described in these patients so far, and most cases are found in infancy and childhood. MRI and its multiplanar capabilities and high spatial and contrast resolution increased its recognition. Two cases are reported, with emphasis o...

Mendonça J; Natal M; Viana S; Coimbra P; Viana M; Matsumine M

2004-01-01

52

Internal margin assessment using cine MRI analysis of deglutition in head and neck cancer radiotherapy  

Energy Technology Data Exchange (ETDEWEB)

Purpose: Intensity-modulated radiation therapy (IMRT) is a promising treatment modality for patients with head and neck cancer (HNC). The dose distributions from IMRT are static and, thus, are unable to account for variations and/or uncertainties in the relationship between the patient (region being treated) and the beam. Organ motion comprises one such source of this uncertainty, introduced by physiological variation in the position, size, and shape of organs during treatment. In the head and neck, the predominant source of this variation arises from deglutition (swallowing). The purpose of this study was to investigate whether cinematographic MRI (cine MRI) could be used to determine asymmetric (nonuniform) internal margin (IM) components of tumor planning target volumes based on the actual deglutition-induced tumor displacement. Methods: Five head and neck cancer patients were set up in treatment position on a 3 T MRI scanner. Two time series of single-slice, sagittal, cine images were acquired using a 2D FLASH sequence. The first time series was a 12.8 min scan designed to capture the frequency and duration of deglutition in the treatment position. The second time series was a short, 15 s scan designed to capture the displacement of deglutition in the treatment position. Deglutition frequency and mean swallow duration were estimated from the long time series acquisition. Swallowing and resting (nonswallowing) events were identified on the short time series acquisition and displacement was estimated based on contours of gross tumor volume (GTV) generated at each time point of a particular event. A simple linear relationship was derived to estimate 1D asymmetric IMs in the presence of resting- and deglutition-induced displacement. Results: Deglutition was nonperiodic, with frequency and duration ranging from 2.89-24.18 mHz and from 3.86 to 6.10 s, respectively. The deglutition frequency and mean duration were found to vary among patients. Deglutition-induced maximal GTV displacements ranged from 0.00 to 28.36 mm with mean and standard deviation of 4.72{+-}3.18, 3.70{+-}2.81, 2.75{+-}5.24, and 10.40{+-}10.76 mm in the A, P, I, and S directions, respectively. Resting-induced maximal GTV displacement ranged from 0.00 to 5.59 mm with mean and standard deviation of 3.01{+-}1.80, 1.25{+-}1.10, 3.23+2.20, and 2.47{+-}1.11 mm in the A, P, I, and S directions, respectively. For both resting and swallowing states, displacement along the S-I direction dominated displacement along the A-P direction. The calculated IMs were dependent on deglutition frequency, ranging from 3.28-4.37 mm for the lowest deglutition frequency patient to 3.76-6.43 mm for the highest deglutition frequency patient. A statistically significant difference was detected between IMs calculated for P and S directions (p=0.0018). Conclusions: Cine MRI is able to capture tumor motion during deglutition. Swallowing events can be demarcated by MR signal intensity changes caused by anatomy containing fully relaxed spins that move medially into the imaging plane during deglutition. Deglutition is nonperiodic and results in dynamic changes in the tumor position. Deglutition-induced displacements are larger and more variable than resting displacements. The nonzero mean maximum resting displacement indicates that some tumor motion occurs even when the patient is not swallowing. Asymmetric IMs, derived from deglutition frequency, duration, and directional displacement, should be employed to account for tumor motion in HNC RT.

Paulson, Eric S.; Bradley, Julie A.; Wang Dian; Ahunbay, Ergun E.; Schultz, Christoper; Li, X. Allen [Department of Radiation Oncology, Medical College of Wisconsin, Milwaukee, Wisconsin 53226 (United States)

2011-04-15

53

Pubic insufficiency fracture: MRI findings  

Energy Technology Data Exchange (ETDEWEB)

To evaluate the characteristic MRI findings of pubic insufficiency fracture. In nine cases of pubic insufficiency fracture, the findings of plain radiography (n=9), MRI (n=9), and bone scintigraphy (n=8) were reviewed. We retrospectively analyzed, with regard to fracture site, the destructive pattern revealed by plain radiography, and uptake by other pelvic bones, as demonstrated by RI bone scanning. The MR findings evaluated were the fracture gap and its signal intensity, the site and signal intensity of the soft tissue mass, and other pelvic bone fractures. Plain radiography revealed osteolysis and sclerosis of pubic bone in eight of nine cases (89%), and parasymphyseal fractures in seven (78%). RI indicated uptake by the sacrum in six cases (66%), and by the ilium in three (33%). MR findings of fracture gap (seven cases, 78%) were hypo to isointensity on T1WI, hyper intensity on T2WI and the absence of contrast enhancement. Soft tissue masses were found in seven cases (78%); in four of these the location was parasymphyseal, and in three, surrounding muscle was involved. Hypo to isointensity was revealed by T1WI, hyperintensity by T2WI, and there was peripheral enhancement. Other associated pelvic bone fractures involved the sacrum in seven cases and the ilium in four. The characteristic MR findings of pubic insufficiency fracture were parasymphyseal location, fracture gap, peripherally enhanced soft tissue mass formation, and fractures of other pelvic bones, namely the sacrum and ilium.

Min, Tae Kyu; Lee, Yeon Soo; Park, Jeong Mi; Kim, Jee Young; Chung, Hong Jun; Lee, Eun Hee; Lee, Eun Ja; Kang, So Won [College of Medicine, The Catholic University of Korea, Seoul (Korea, Republic of); Han Tae Il [Eulji Medical College, Taejon (Korea, Republic of)

2000-10-01

54

Joint multi-object registration and segmentation of left and right cardiac ventricles in 4D cine MRI  

Science.gov (United States)

The diagnosis of cardiac function based on cine MRI requires the segmentation of cardiac structures in the images, but the problem of automatic cardiac segmentation is still open, due to the imaging characteristics of cardiac MR images and the anatomical variability of the heart. In this paper, we present a variational framework for joint segmentation and registration of multiple structures of the heart. To enable the simultaneous segmentation and registration of multiple objects, a shape prior term is introduced into a region competition approach for multi-object level set segmentation. The proposed algorithm is applied for simultaneous segmentation of the myocardium as well as the left and right ventricular blood pool in short axis cine MRI images. Two experiments are performed: first, intra-patient 4D segmentation with a given initial segmentation for one time-point in a 4D sequence, and second, a multi-atlas segmentation strategy is applied to unseen patient data. Evaluation of segmentation accuracy is done by overlap coefficients and surface distances. An evaluation based on clinical 4D cine MRI images of 25 patients shows the benefit of the combined approach compared to sole registration and sole segmentation.

Ehrhardt, Jan; Kepp, Timo; Schmidt-Richberg, Alexander; Handels, Heinz

2014-03-01

55

Cine MRI of the ascending aorta in the elderly with respect to the flow signal void and aortic valve morphology  

International Nuclear Information System (INIS)

Cine flow MRI was performed on a 1.5 Tesla system to observe signal intensity of blood flow within the ascending aorta in the elderly who had no aortic stenosis and to determine frequency of the flow signal void. Coronal and sagittal imaging planes of the ascending aorta were obtained in 27 aged patients with no known cardiac diseases (14 men and 13 women, mean age of 76) and 7 young volunteers (7 men, mean age of 24), utilizing ECG-gating, GRASS (gradient-recalled acquisition in steady state), and a flow compensation sequence. The young volunteers presented little or no signal void within the ascending aorta. In 26 (96%) of the 27 aged patients, on the other hand, signal void was demonstrated in the blood flow distal to the aortic valve during systole. The maximum length of the signal void that was measured at 318?632 msec after the R wave of ECG ranged from 33 to 97 mm. Conventional and Doppler echocardiography was used to evaluate motion and morphology of the aortic valve in 19 of the 27 aged patients. Eighteen of these 19 subjects had aortic signal void on cine MRI. Echocardiography showed sclerotic changes of the aortic valve (i.e., increased echogenicity of the cusps and/or commissure fusion) in 10 (53%) of the 19 subjects. The mean maximum length of the signal void in the 10 patients with aortic valve sclerosis was significantly greater than that in the 9 patients with echocardiographically normal valve (68 vs.45 mm, p<0.01). These results suggest that signal0.01). These results suggest that signal void of blood flow in the ascending aorta, which is recognized as one of the characteristic findings in patients with aortic stenosis, is not a specific feature for this disease but rather a commom one in the elderly particularly those with sclerotic changes of the aortic valve. However, the length of the signal void may distinguish between nonstenotic and stenotic aortic valves. (author)

56

Error analysis of cine phase contrast MRI velocity measurements used for strain calculation.  

Science.gov (United States)

Cine Phase Contrast (CPC) MRI offers unique insight into localized skeletal muscle behavior by providing the ability to quantify muscle strain distribution during cyclic motion. Muscle strain is obtained by temporally integrating and spatially differentiating CPC-encoded velocity. The aim of this study was to quantify CPC measurement accuracy and precision and to describe error propagation into displacement and strain. Using an MRI-compatible jig to move a B-gel phantom within a 1.5T MRI bore, CPC-encoded velocities were collected. The three orthogonal encoding gradients (through plane, frequency, and phase) were evaluated independently in post-processing. Two systematic error types were corrected: eddy current-induced bias and calibration-type error. Measurement accuracy and precision were quantified before and after removal of systematic error. Through plane- and frequency-encoded data accuracy were within 0.4mm/s after removal of systematic error - a 70% improvement over the raw data. Corrected phase-encoded data accuracy was within 1.3mm/s. Measured random error was between 1 to 1.4mm/s, which followed the theoretical prediction. Propagation of random measurement error into displacement and strain was found to depend on the number of tracked time segments, time segment duration, mesh size, and dimensional order. To verify this, theoretical predictions were compared to experimentally calculated displacement and strain error. For the parameters tested, experimental and theoretical results aligned well. Random strain error approximately halved with a two-fold mesh size increase, as predicted. Displacement and strain accuracy were within 2.6mm and 3.3%, respectively. These results can be used to predict the accuracy and precision of displacement and strain in user-specific applications. PMID:25433567

Jensen, Elisabeth R; Morrow, Duane A; Felmlee, Joel P; Odegard, Gregory M; Kaufman, Kenton R

2015-01-01

57

Frequency analysis of CSF flow on cine-MRI in normal pressure hydrocephalus  

International Nuclear Information System (INIS)

To clarify the flow dynamics of intracranial cerebrospinal fluid (CSF) in normal pressure hydrocephalus (NPH), frequency analyses of CSF flow measured with an ECG-gated phase contrast cine magnetic resonance imaging (MRI) were performed. The amplitude and phase in the CSF flow spectra in the aqueduct were determined in patients with NPH after a subarachnoid hemorrhage (SAH-NPH group, n=26), an idiopathic NPH (I-NPH group, n=4), an asymptomatic ventricular dilation or a brain atrophy (VD group, n=21), and in healthy volunteers (control group, n=25). The changes of CSF flow spectra were also analyzed 5 and 15 minutes after an intravenous injection of acetazolamide. Moreover, a phase transfer function (PTF) calculated from the spectra of the driving vascular pulsation and CSF flow in the aqueduct were assessed in patients with SAH-NPH and control groups before and after acetazolamide injection. There values were compared with the pressure volume response (PVR). The amplitude of the 1st-3rd harmonics in the SAH-NPH or I-NPH group was significantly larger than in the control or VD group because of a decrease in compliance (increase in PVR). The phase of the 1st harmonic in the SAH-NPH group was significantly different from that in the control or VD group, but no difference was found between the control and VD groups. The amplitude of the 0-3rd harmonics increased, and the phase of the 1st harmonic changed in all groups after an acetazolamide injection. An evaluation of thetazolamide injection. An evaluation of the time course of the direct current of CSF flow provided further information about the compensatory faculty of the cerebrospinal cavity. A PTF of the 1st harmonic in the SAH-NPH group was significantly larger than in the control group, and a positive correlation was noted between PTF of the 1st harmonic and PVR. In conclusion, frequency analyses of CSF flow measured by cine-MRI make it possible to obtain noninvasively a more detailed picture of the pathophysiology of NPH and of changes in intracranial conditions. (author)

58

Assessment of left atrial volume by Gd-DTPA-enhanced ultrafast cine MRI. Hemodynamic assessment in various diseases  

International Nuclear Information System (INIS)

To assess the validity of contrast-enhanced breath-hold ultrafast cine MR imaging in left atrial (LA) volumes (LA max.I: maximal volume index of LA/LA min.I: minimal volume index of LA) and LA-volume curve, this method was compared with intravenous digital subtraction left atrial angiography (DSA) in serial 26 patients. The pulse sequence of ultrafast cine MRI were TR 8 ms, TE 3.2 ms, matrix 128 x 96 and NEX 1. The contrast-enhanced ultrafast cine MRI was shown to provide accurate left atrial images with higher success rate (88.9% in horizontal long axis view and 86.9% in vertical long axis view) in serial 891 cases. Comparison with LA volumes showed a high correlation (LA max.I: r=0.934, p2 in maximum and 17±5 ml/m2 in minimum. In patients with hypertension, old myocardial infarction, mitral valve diseases, dilated cardiomyopathy (DCM) and hypertrophic cardiomyopathy, LA-volumes were significantly increased. The LA-volumes at the beginning of left atrial active contraction were significantly correlated with LA-volume of active contraction. However, in patients with DCM, these statistical correlation were not demonstrated. In patients with DCMe not demonstrated. In patients with DCM, preload of LA were increased, but LA-volumes of active contraction were not increased. For this reason, the afterload mismatch of LA was suspected in DCM. In conclusion, the contrast-enhanced ultrafast cine MRI is useful for determining LA volumes and LA volume curves. (author)

59

MRI findings of vermian medulloblastoma  

International Nuclear Information System (INIS)

To find characteristic MRI features of vermian medulloblastoma. Materials and methods; MRI studies and medical records were retrospectively reviewed for 12 patients with surgically proven midline medulloblastoma. The assessment concerned appearance of the mass in relation to surrounding structures: MR signal intensity; the enhancement pattern; the mass's location and size: presence of a cystic/necrotic area, calcification, or vascular void: extension through the foramen Luschka: degree of hydrocephalus: and presence of tonsillar herniation. The midline medulloblastoma commonly showed roundish moon-surface appearance, especially on the axial T2-weighted images. All tumors showed heterogeneous signal intensities mainly due to intratumoral cystic/necrotic or hemorrhagic changes. The tumors were commonly located at mid-and/or inferior vermis. Occasionally the tumors extended through the foramen Luschka, and caused obstructive hydrocephalus of moderate to severe degree. Post-contrast study showed heterogeneous, dense contrast enhancement in the majority of patients. The MR finding of the moon-surface appearance formed by both the mass and the intratumoral cystic/necrotic change as seen on axial T2-weighted images could be helpful in the diagnosis of vermian medulloblastoma

60

Accuracy of left ventricular ejection fraction estimation by gated Tc-99m sestamibi SPECT: Comparison with breath hold Cine MRI  

International Nuclear Information System (INIS)

Full text: Left Ventricular Ejection Fraction (LVEF) is one of the most important functional parameters in clinical cardiology. Due to the high temporal and spatial resolution of Breath Hold Cine MRI (MRI), this technique is considered to be able to accurately estimate Left Ventricular volumes and hence LVEF. Recently, LVEF has been measured using Gated Tc-99m Sestamibi SPECT (GSSPECT) and a validation study comparing LVEF calculated by GSSPECT and MRI was performed. Over a four month period, 14 patients had both GSSPECT and MRI within a stable 7 day period. All patients were being investigated for CAD and the GSSPECT was performed as part of the routine myocardial perfusion imaging. GSSPECT was performed at rest one hour after peak exercise injection of Tc-99m Sestamibi (mean dose 1000 MBq, range 800- 1100 MBq) with imaging performed on Picker 1000 gamma camera or 3000 using standard 8 interval acquisition. All patients were analysed with the automated Picker QGS package. MRI was performed on a 1.5 T MRI( GE Signa Advantage) using a previously described breath hold Cine technique with data being acquired in the cardiac short axis. The entire LV was imaged with 10 cm contiguous short axis slices being acquired with 11-16 frames per slice, depending on heart rate. A semi automated volumetric image analysis program was used to estimate LV volumes using Simpson's rule. The range of LVEF was from 30% to 70%. Linear regression analysis demonstrated excellent agreement for ysis demonstrated excellent agreement for LVEF calculated by GSSPECT and MRI (y= -5.4 + 0.97 x, r=0.90). Automated estimation of LVEF using GSSPECT correlates well with LVEF estimations using MRI and can accurately estimate LVEF in routine clinical practice

 
 
 
 
61

Detection of viable myocardium by low dose dobutamine cine MRI: experimental study in pigs  

International Nuclear Information System (INIS)

Objective: To evaluate the diagnostic value of dobutamine stress magnetic resonance imaging (MR) for myocardial viability. Methods: Mini swine (n = 10) underwent left ventriculography and coronary angiography, followed by stenosis of the left circumflex coronary artery (LCX) using aneroid constrictor. More than 1 month later left ventriculography and coronary angiography were performed again, followed by cine-MR at rest and during stress with incremental dose of dobutamine 5-20 ?g · kg-1 · min-1. Traditional and/or breath-hold cine-MR were used to evaluate regional left ventricular wall motion, corresponding to basal, mid ventricular and apical short-axis tomograms. Regional wall motion score index (WMSI) was calculated. Mini swine were finally sacrificed for pathological examination. Triphenyl tetrazolium chloride (TTC) assessed myocardial infarction. Microscopy was used to identify myocardial cellular changes. Results: One pig died, 1 pig suffered from aneurysm and another 1 showed negative findings. The other 7 pigs were found with hypokinetic (n=4) or akinetic (n = 3) myocardial regions related to stenosed LCX, their mean WMSI at rest for the lateral and postero-inferior walls (ischemic regions) of the left ventricle was 2.27 +- 0.32 compared with 1.00 +- 0.00 (x2 = 106.27, P 2 = 20.57, P -1·min-1. However, the mean WMSI at the dose of dobutamine 10 and 20 ?g·kg-1·min-1 was 1.70 +- 0.76, 1.75 +- 0.83, respectively, compared with the mean WSCI at rest (x2=3.25 versus 2.33, P > 0.05). The pathologic examination showed viable myocardium at the ischemic regions. Conclusion: Low dose dobutamine (5 ?g·kg-1·min-1) can recover hypokinetic or akinetic myocardial regions, Dobutamine stress MR can detect myocardial viability

62

MRI findings of bone tumor  

International Nuclear Information System (INIS)

To investigate the usefulness of magnetic resonance imaging, MRI, of bone tumors, we retrospectively reviewed 32 MRI examination already diagnosed pathologically. Subjects included 18 males and 14 females, ranging in age from 5 to 63 years, with a means of 29.3 years. These included 25 benign bone tumors and 7 malignant bone tumors. The accuracy of a qualitative diagnosis was observed in giant cell tumor, osteoid osteoma, fibrous dysplasia and ossifying fibroma. In malignant bone tumors, it is difficult to accurately diagnose with MRI, although MRI was useful in showing interaction of the tumor and host tissue, extension, edema and reactive zone. (author)

63

MRI findings of bone tumor  

Energy Technology Data Exchange (ETDEWEB)

To investigate the usefulness of magnetic resonance imaging, MRI, of bone tumors, we retrospectively reviewed 32 MRI examination already diagnosed pathologically. Subjects included 18 males and 14 females, ranging in age from 5 to 63 years, with a means of 29.3 years. These included 25 benign bone tumors and 7 malignant bone tumors. The accuracy of a qualitative diagnosis was observed in giant cell tumor, osteoid osteoma, fibrous dysplasia and ossifying fibroma. In malignant bone tumors, it is difficult to accurately diagnose with MRI, although MRI was useful in showing interaction of the tumor and host tissue, extension, edema and reactive zone. (author)

Hamanaka, Hideaki; Kashiwagi, Teruyuki; Chosa, Etuo; Kuwahara, Shigeru; Tajima, Naoya [Miyazaki Medical Coll., Kiyotake (Japan)

1996-09-01

64

MRI findings of congenita dysosmia  

International Nuclear Information System (INIS)

Objective: To study the MRI findings of congenital dysosmia. Methods: Forty-seven patients with congenital dysosmia (39 with Kallmann syndrome and 8 with isolated dysosmia) and 21 normal volunteers underwent MRI examination. The features of congenital malformation were recorded. The volume of olfactory bulbs, depth of olfactory sulci as well as diameters of pituitary glands and stalks were measured. The rate of dysplasia of olfactory bulbs and tracts in the two patients groups was compared with X2 test. The difference of volume of olfactory bulbs between the two groups was evaluated with nonparametric test. And the difference of diameters of pituitary glands and stalks was analyzed with analysis of variance. Results: All the patients had abnormal findings in olfactory bulbs, tracts and/or olfactory sulci on MR images. The patterns of congenital malformation may be dysplastic of hypoplastic, symmetric or asymmetric. The proportion of patients with dysplasia of olfactory bulbs and tracts in Kallmann syndrome patients (31/39) was higher than that in isolated dysosmia ones (2/8) (X2 = 6.998, P =0.008), and the olfactory bulbs'volume of patients with Kallmann syndrome (median 8 mm3) was smaller than that of patients with isolated dysosmia (median 22 mm3) (Z = -2.902, P =0.004). The pituitary glands were smaller and the stalks were thinner in patients with Kallmann syndrome than those in volunteers [ the anteroposterior diameter oolunteers [ the anteroposterior diameter of pituitary glands in Kallmann syndrome (7.22 ± 1.93) mm, that in normal volunteers (9.94 ± 1.59) mm, F= 16.835, P =0.000; height of pituitary glands in Kallmann syndrome (3.71 ± 1.74) mm, that in normal volunteers (6.00 ± 1.24) mm, F =16.092, P =0.000; the anteroposterior diameter of pituitary stalks in Kallmann syndrome (1.19 ± 0.55) mm, that in normal volunteers (1.88 ± 0.49) mm, F =13.060, P =0.000]. Conclusions: In congenital dysosmic patients, dysplasia or hypoplasia of olfactory bulbs, tracts and sulci can be clearly depicted on MR images. MR imaging is valuable for clinical diagnosis and treatment. (authors)

65

Observation of the CSF pulsatile flow in the aqueduct using cine MRI with presaturation bolus tracking, 3  

International Nuclear Information System (INIS)

The to-and-fro motion patterns of the CSF flow in the aqueduct in ten normal adults, ten patients with secondary normal-pressure hydrocephalus (NPH), and fourteen patients with idiopathic ventriculomegaly were analyzed using cine MRI with presaturation bolus tracking. The to-and-fro motion patterns of the CSF flow in the aqueduct were thus classified into four types according to their maximum velocity and the relative time duration of their flow in the rostral and caudal directions. The correlation between the clinical symptoms, the CT findings, the RI-cisternography findings, the results of the ICP monitorings, and the CSF pulsatile-flow patterns were then analyzed. In secondary NPH disclosing frequent B waves on ICP monitoring, the maximum velocity of the CSF flow in the aqueduct was over 15 mm/sec, and the duration of the CSF flow was longer in the caudal direction than in the rostral direction. Furthermore, the faster the maximum velocity of the CSF flow, the larger the ventricular size on CT and the more severe the CSF malabsorption on cisternography. In idiopathic ventriculomegaly, only two cases demonstrated the same CSF flow pattern as was shown in secondary NPH; the other cases demonstrated other CSF flow patterns, which were considered to indicate hydrocephalus ex vacuo or arrested hydrocephalus. The CSF pulsatile-flow pattern was assumed to change according to the degree of the CSF circulatory disorder, its compensatory process, and the plasticity of the brtory process, and the plasticity of the brain. The investigation of the CSF pulsatile flow gives important information for the evaluation of various hydrocephalic conditions. (author)

66

MRI findings of juvenile psoriatic arthritis  

International Nuclear Information System (INIS)

The aim of this study was to describe the magnetic resonance imaging (MRI) features of juvenile psoriatic arthritis (JpsA) in children in order to facilitate early diagnosis and proper management. Two pediatric radiologists retrospectively reviewed in consensus a total of 37 abnormal MRI examinations from 31 pediatric patients (nine boys, 22 girls; age range 1-17 years; mean age 9.4 years) who had a definite diagnosis of JpsA and underwent MRI. Each MRI was evaluated for synovium abnormality (thickening and enhancement), joint effusion (small, moderate, and large), bone marrow abnormality (edema, enhancement, and location of abnormality), soft tissue abnormality (edema, enhancement, atrophy, and fatty infiltration), tendon abnormality (thickening, edema, tendon sheath fluid, and enhancement), and articular abnormality (joint space narrowing and erosion). The distribution of abnormal MRI findings among the six categories for the 37 MRI examinations was evaluated. The number of abnormal MRI findings for each MRI examination was assessed. Age at MRI examination and all six categories of abnormal MRI findings according to gender were evaluated. There were a total 96 abnormal MRI findings noted on 37 abnormal MRI examinations from 31 pediatric patients. The 37 abnormal MRI examinations included MRI of the hand (n=8), knee (n = 8), ankle (n = 5), pelvis (n = 5), temporomandibular joint (n = 4), wrist (n = 3), foot (n = 2), elbow (n = 1), and shoulder (n = 1). Twenty-eight d= 1), and shoulder (n = 1). Twenty-eight diffuse synovial thickening and/or enhancement were the most common MRI abnormality (29.2%). Joint effusion comprised 22 abnormal MRI findings (22.9%). There were 16 abnormal MRI bone marrow edema and/or enhancement findings (16.7%), and in seven (7.3%) the edema involved non-articular sites. Soft tissue abnormality manifested as edema and/or enhancement constituted 14 abnormal MRI findings (14.5%). There were ten MRI abnormalities (10.4%) involving tendons. Articular abnormality seen as joint space narrowing and/or bone erosion comprised six abnormal MRI findings (6.2%). Most MRI examinations had more than one abnormal finding (84%). Age at which MRI examinations were performed was not significantly different between boys and girls. All six categories of abnormal MRI findings were not significantly different between boys and girls. Children with JpsA typically present with more than one abnormal finding on their MRI studies. While synovial abnormality is the most common MR finding in children with JpsA, multi-focal bone marrow edema and enhancement at both articular and non-articular sites are also notable findings in children with JpsA. The rate of articular abnormality is much lower in children with JpsA in comparison to adults with psoriatic arthritis. Our findings suggest that MRI can play a useful role in the diagnosis and ongoing assessment of this uncommon, though important, pediatric rheumatologic disorder. (orig.)

67

Imaging Three-Dimensional Myocardial Mechanics Using Navigator-gated Volumetric Spiral Cine DENSE MRI  

Digital Repository Infrastructure Vision for European Research (DRIVER)

A navigator-gated 3D spiral cine displacement encoding with stimulated echoes (DENSE) pulse sequence for imaging 3D myocardial mechanics was developed. In addition, previously-described 2D post-processing algorithms including phase unwrapping, tissue tracking, and strain tensor calculation for the left ventricle (LV) were extended to 3D. These 3D methods were evaluated in 5 healthy volunteers, using 2D cine DENSE and historical 3D myocardial tagging as reference standards. With an average sca...

Zhong, Xiaodong; Spottiswoode, Bruce S.; Meyer, Craig H.; Kramer, Christopher M.; Epstein, Frederick H.

2010-01-01

68

Congenital dacryocystocele: prenatal MRI findings  

Energy Technology Data Exchange (ETDEWEB)

Congenital dacryocystocele can be diagnosed prenatally by imaging. Prenatal MRI is increasingly utilized for fetal diagnosis. To present the radiological and clinical features of seven fetuses with congenital dacryocystocele diagnosed with prenatal MRI. The institutional database of 1,028 consecutive prenatal MR examinations performed during a period of 4 years was reviewed retrospectively. The cases of congenital dacryocystocele were identified by reading the report of each MRI study. The incidence of dacryocystocele diagnosed with prenatal MRI was 0.7% (n=7/1,028). The dacryocystocele was bilateral in three fetuses. Mean gestational age at the time of diagnosis was 31 weeks. The indication for prenatal MRI was the presence or the suspicion of central nervous system abnormality in six fetuses and diaphragmatic hernia in one. Dacryocystocele was associated with an intranasal cyst in six of ten eyes. Prenatal sonography revealed dacryocystocele in only two of seven fetuses. Of eight eyes with postnatal follow-up, four did not have any lacrimal symptoms. Prenatal MRI can delineate congenital dacryocystocele more clearly and in a more detailed fashion than ultrasonography. Presence of dacryocystocele was symptomatic in only 50% of our patients, supporting that prenatal diagnosis of dacryocystocele might follow a benign course. (orig.)

Yazici, Zeynep [Cincinnati Children' s Hospital Medical Center, Department of Radiology, Cincinnati, OH (United States); Uludag University, Department of Radiology, Faculty of Medicine, Bursa (Turkey); Kline-Fath, Beth M.; Rubio, Eva I.; Calvo-Garcia, Maria A.; Linam, Leann E. [Cincinnati Children' s Hospital Medical Center, Department of Radiology, Cincinnati, OH (United States); Yazici, Bulent [Uludag University, Department of Ophthalmology, Faculty of Medicine, Bursa (Turkey)

2010-12-15

69

MRI changes in myocarditis - Evaluation with spin echo, cine MR angiography and contrast enhanced spin echo imaging  

International Nuclear Information System (INIS)

AIM: Myocarditis is probably under-diagnosed with clinical criteria generally used for diagnosis. Magnetic resonance imaging (MRI) has shown promise in detecting heart muscle disorders and we set out to assess the role of cine magnetic resonance angiography (MRA) and contrast enhancement in myocarditis, as there is a need for a non-invasive tool that can aid prognosis and follow-up. MATERIALS AND METHODS: Twenty patients were evaluated with T1 SE pre- and post-gadolinium enhancement and cine MRA. Four patients were histologically proven to have myocarditis, eight others were diagnosed as having myocarditis by clinical criteria and eight did not have myocarditis. Images were evaluated in a blinded fashion for regional wall motion abnormality and contrast enhancement pattern. Analysis of contrast enhancement by signal intensity measurement was also performed. RESULTS: Focal myocardial enhancement with associated regional wall motion abnormality correlated with myocarditis in 10 out of 12 patients, two patients with abnormal focal enhancement alone also clinically had myocarditis. None of the non-myocarditis patients showed abnormal focal enhancement. Enhancement analysis suggests that focal corrected myocardial enhancement of > 40% is abnormal. CONCLUSION: In the correct clinical context, focal myocardial enhancement on spin echo MRI strongly supports a diagnosis of myocarditis, especially when associated with regional wall motion abnormality. Roditi, G.H. (2000)on abnormality. Roditi, G.H. (2000)

70

Measurement of Strain in the Left Ventricle during Diastole with cine-MRI and Deformable Image Registration  

International Nuclear Information System (INIS)

The assessment of regional heart wall motion (local strain) can localize ischemic myocardial disease, evaluate myocardial viability and identify impaired cardiac function due to hypertrophic or dilated cardiomyopathies. The objectives of this research were to develop and validate a technique known as Hyperelastic Warping for the measurement of local strains in the left ventricle from clinical cine-MRI image datasets. The technique uses differences in image intensities between template (reference) and target (loaded) image datasets to generate a body force that deforms a finite element (FE) representation of the template so that it registers with the target image. To validate the technique, MRI image datasets representing two deformation states of a left ventricle were created such that the deformation map between the states represented in the images was known. A beginning diastoliccine-MRI image dataset from a normal human subject was defined as the template. A second image dataset (target) was created by mapping the template image using the deformation results obtained from a forward FE model of diastolic filling. Fiber stretch and strain predictions from Hyperelastic Warping showed good agreement with those of the forward solution. The technique had low sensitivity to changes in material parameters, with the exception of changes in bulk modulus of the material. The use of an isotropic hyperelastic constitutive model in the Warping analyses degraded the predictions oarping analyses degraded the predictions of fiber stretch. Results were unaffected by simulated noise down to an SNR of 4.0. This study demonstrates that Warping in conjunction with cine-MRI imaging can be used to determine local ventricular strains during diastole

71

MRI findings of extramedullary haemopoiesis  

Energy Technology Data Exchange (ETDEWEB)

Extramedullary haemopoiesis (EH) is a compensatory process associated with chronic haemolytic anaemia. It is rare, however, for such an abnormality to cause spinal cord compression. We present two patients with known beta-thalassaemia intermedia who developed spinal cord compression due to masses of extramedullary haematopoietic tissue in the epidural space of the thoracic spine. The EH masses were diagnosed by MRI as an isointense epidural lesion on both T1- and T2-weighted images, compressing severely the spinal cord. After administration of a paramagnetic agent, an intermediate enhancement of the masses was evident. All the vertebral bodies had low to intermediate signal intensity as a result of displacement of fatty marrow by haematopoietic marrow. Expansion of thoracic ribs with bilateral paravertebral masses were characteristic. A small dose of radiotherapy was given and marked improvement in neurological symptoms was evident. An MRI examination established shrinkage of the mass and decompression of spinal cord. The role of MRI in diagnosis of EH masses is essential and radiation therapy is a very effective treatment for this rare complication. (orig.)

Chourmouzi, D.; Pistevou-Gompaki, K.; Plataniotis, G.; Skaragas, G.; Papadopoulos, L.; Drevelegas, A. [Dept. of Diagnostic Radiology and Radiation Oncology, AHEPA University Hospital, Thessaloniki (Greece)

2001-09-01

72

MRI findings of extramedullary haemopoiesis  

International Nuclear Information System (INIS)

Extramedullary haemopoiesis (EH) is a compensatory process associated with chronic haemolytic anaemia. It is rare, however, for such an abnormality to cause spinal cord compression. We present two patients with known beta-thalassaemia intermedia who developed spinal cord compression due to masses of extramedullary haematopoietic tissue in the epidural space of the thoracic spine. The EH masses were diagnosed by MRI as an isointense epidural lesion on both T1- and T2-weighted images, compressing severely the spinal cord. After administration of a paramagnetic agent, an intermediate enhancement of the masses was evident. All the vertebral bodies had low to intermediate signal intensity as a result of displacement of fatty marrow by haematopoietic marrow. Expansion of thoracic ribs with bilateral paravertebral masses were characteristic. A small dose of radiotherapy was given and marked improvement in neurological symptoms was evident. An MRI examination established shrinkage of the mass and decompression of spinal cord. The role of MRI in diagnosis of EH masses is essential and radiation therapy is a very effective treatment for this rare complication. (orig.)

73

Cine-MRI and (31)P-MRS for evaluation of myocardial energy metabolism and function following coronary artery bypass graft.  

Science.gov (United States)

Previous studies investigated the effect of successful coronary artery bypass grafting (CABG) upon left ventricular function. The relationship between myocardial metabolism and heart function after CABG remains unclear. We investigated the relationship between high-energy phosphate (HEP) and cardiac function following CABG using cine magnetic resonance imaging (cine-MRI) and phosphorus-31 magnetic resonance spectroscopy ((31)P-MRS). A retrospective study was approved by the institutional review board. MRI and (31)P-MRS examinations were reviewed of 37 patients with multivessel disease who underwent CABG. 13 of these patients selected for the retrospective analysis had >or=70% stenosis in the proximal left anterior descending artery (LAD) and left ventricular ejection fraction (LVEF) <40%. LVEF was evaluated using cine-MRI. HEP such as phosphocreatine (PCr) and adenosine triphosphate (beta-ATP) was measured using (31)P-MRS to calculate PCr/beta-ATP ratio. Cine-MRI and (31)P-MRS measurements were performed before and after CABG, respectively. Ten normal healthy volunteers served as controls. (31)P-MRS in 13 patients showed that post-CABG PCr/beta-ATP ratio was significantly higher than that of pre-CABG (pre-CABG vs. post-CABG, 1.43+/-0.24 vs. 1.71+/-0.29, P<.05), but both ratios were significantly lower than control group (2.13+/-0.21, P<.05). With the change of the ratio, the left ventricle function was significantly improved (LVEF: pre-CABG vs. post-CABG: 35.7+/-12.9 vs. 45.6+/-17.2, P<.05). The ability of (31)P-MRS and cine-MRI to non-invasively assess changes of metabolism and function in myocardium may prove important for patient-specific optimization of treatment strategies. PMID:20444565

Zhang, Zhuoli; Li, Junxia; Wu, Shengyong; Liu, Ying; Fan, Zhaoyang; Zhou, Xiangzhi; Zhao, Haitao; Li, Debiao; Huan, Yi

2010-09-01

74

MRI findings of Guillain-Barre syndrome  

Energy Technology Data Exchange (ETDEWEB)

To evaluate MRI findings of Guillain-Barre syndrome. In six patients with Guillain-Barre syndrome diagnosed by clinical, cerebrospinal fluid and electrophysiologic findings, a retrospective review of MR findings was conducted. Follow-up MRI scans were carried out in two patients showing minimal clinical improvement. Marked or moderate enhancement of thickened nerve roots was seen in all cases on gadopentetate dimeglumine enhanced axial T1-weighted images. Two patterns were seen; one was even enhancement of both anterior and posterior nerve roots (n=1) and the other was enhancement of anterior nerve roots only (n=5). Enhancement and thickness of nerve roots was seen to have slightly decreased on MRI follow-up at 32 and 50 days; clinical and electrophysiologic examination showed minimal improvement. Although MRI findings of nerve root enhancement are nonspecific and can be seen in neoplastic and other inflammatory diseases, the enhancement of thickened anterior nerve roots within the cal sac suggests Guillain-Barre syndrome.

Park, Won Kyu; Lee, Hwa Jin; Byun, Woo Mok [Yeungnam Univ. College of Medicine, Taegu (Korea, Republic of)

1997-04-01

75

MRI findings in acute Hendra virus meningoencephalitis  

International Nuclear Information System (INIS)

Aim: To describe serial changes in brain magnetic resonance imaging (MRI) in acute human infection from two outbreaks of Hendra virus (HeV), relate these changes to disease prognosis, and compare HeV encephalitis to reported cases of Nipah virus encephalitis. Materials and methods: The MRI images of three human cases (two of which were fatal) of acute HeV meningoencephalitis were reviewed. Results: Cortical selectivity early in the disease is evident in all three patients, while deep white matter involvement appears to be a late and possibly premorbid finding. This apparent early grey matter selectivity may be related to viral biology or ribavirin pharmacokinetics. Neuronal loss is evident at MRI, and the rate of progression of MRI abnormalities can predict the outcome of the infection. In both fatal cases, the serial changes in the MRI picture mirrored the clinical course. Conclusion: This is the first comprehensive report of serial MRI findings in acute human cerebral HeV infection from two outbreaks. The cortical selectivity appears to be an early finding while deep white matter involvement a late, and possibly premorbid, finding. In both fatal cases, the serial changes in MRI mirrored the clinical course.

76

MRI findings in acute Hendra virus meningoencephalitis  

Energy Technology Data Exchange (ETDEWEB)

Aim: To describe serial changes in brain magnetic resonance imaging (MRI) in acute human infection from two outbreaks of Hendra virus (HeV), relate these changes to disease prognosis, and compare HeV encephalitis to reported cases of Nipah virus encephalitis. Materials and methods: The MRI images of three human cases (two of which were fatal) of acute HeV meningoencephalitis were reviewed. Results: Cortical selectivity early in the disease is evident in all three patients, while deep white matter involvement appears to be a late and possibly premorbid finding. This apparent early grey matter selectivity may be related to viral biology or ribavirin pharmacokinetics. Neuronal loss is evident at MRI, and the rate of progression of MRI abnormalities can predict the outcome of the infection. In both fatal cases, the serial changes in the MRI picture mirrored the clinical course. Conclusion: This is the first comprehensive report of serial MRI findings in acute human cerebral HeV infection from two outbreaks. The cortical selectivity appears to be an early finding while deep white matter involvement a late, and possibly premorbid, finding. In both fatal cases, the serial changes in MRI mirrored the clinical course.

Nakka, P.; Amos, G.J. [Department of Diagnostic Radiology, Princess Alexandra Hospital, Woolloongabba, Qld 4102 (Australia); Saad, N., E-mail: nivena100@hotmail.com [Department of Diagnostic Radiology, Princess Alexandra Hospital, Woolloongabba, Qld 4102 (Australia); Jeavons, S. [Department of Diagnostic Radiology, Princess Alexandra Hospital, Woolloongabba, Qld 4102 (Australia)

2012-05-15

77

Cerebral MRI Findings in Neonatal Tuberous Sclerosis  

Directory of Open Access Journals (Sweden)

Full Text Available Tuberous sclerosis (TS is a developmental neuroectodermal disorder, affecting multiple organ systems. Most patients are diagnosed at the age of five years or later. Only recently, mutation analysis of TS Complex genes has enabled us make an early or even an antenatal diagnosis of the disease. Early onset with infantile seizures is mainly an ominous sign for an unfavorable outcome."nMRI findings in older children and adults are well-known; however, only limited publications illustrate brain MRI findings in newborns. "nWe present a female neonate with a positive family history, categorized as "definite TS." On MRI of the brain, white matter lesions were depicted. MRI findings were correlated with published data on neonatal TS.

R.D. Langer

2008-04-01

78

[Cine MRI of the ascending aorta in the elderly with respect to the flow signal void and aortic valve morphology].  

Science.gov (United States)

Cine flow MRI was performed on a 1.5 Tesla system to observe signal intensity of blood flow within the ascending aorta in the elderly who had no aortic stenosis and to determine frequency of the flow signal void. Coronal and sagittal imaging planes of the ascending aorta were obtained in 27 aged patients with no known cardiac diseases (14 men and 13 women, mean age of 76) and 7 young volunteers (7 men, mean age of 24), utilizing ECG-gating. GRASS (gradient-recalled acquisition in steady state), and a flow compensation sequence. The young volunteers presented little or no signal void within the ascending aorta. In 26 (96%) of the 27 aged patients, on the other hand, signal void was demonstrated in the blood flow distal to the aortic valve during systole. The maximum length of the signal void that was measured at 318-632 msec after the R wave of ECG ranged from 33 to 97 mm. Conventional and Doppler echocardiography was used to evaluate motion and morphology of the aortic valve in 19 of the 27 aged patients. Eighteen of these 19 subjects had aortic signal void on cine MRI. Echocardiography showed sclerotic changes of the aortic valve (i.e., increased echogenicity of the cusps and/or commissure fusion) in 10 (53%) of the 19 subjects. The mean maximum length of the signal void in the 10 patients with aortic valve sclerosis was significantly greater than that in the 9 patients with echocardiographically normal valve (68 vs. 45 mm, p less than 0.01).(ABSTRACT TRUNCATED AT 250 WORDS) PMID:2079760

Nakayama, M; Kyomasu, Y; Suzuki, Y; Mashima, Y; Tanno, M; Endo, K; Yamada, H

1990-11-01

79

Adaptive correction of imaging plane position in segmented k-space cine cardiac MRI.  

Science.gov (United States)

Variability among breath-holds frequently produces registration errors, a situation that may contribute to reproducibility error in anatomic indices. A navigator-echo-based method for real-time prospective correction of imaging slice level was applied to breath-hold cine cardiac imaging of 13 subjects. Repeat acquisitions with correction in the cardiac short-axis orientation showed significantly improved reproducibility in fractional area change and endocardial centroid location as compared with conventional noncorrected methods. PMID:9307905

Chuang, M L; Chen, M H; Khasgiwala, V C; McConnell, M V; Edelman, R R; Manning, W J

1997-01-01

80

Fucosidosis: MRI and MRS findings  

International Nuclear Information System (INIS)

Fucosidosis is a rare, autosomal recessive lysosomal storage disease in which fucose-containing glycolipids, glycoproteins, and oligosaccharides accumulate in tissues as a consequence of ?-l-fucosidase enzyme deficiency. We present the MR imaging findings of diffuse white-matter hyperintensity and pallidal curvilinear streak hyperintensity in a 6-year-old Caucasian girl with a diagnosis of fucosidosis based on cDNA isolated from skin fibroblasts. This report also includes the MRS findings of a decreased N-acetylaspartate/choline ratio together with an abnormal peak at 3.8 ppm which expand the knowledge of the neuroradiological spectrum of this rare disease. (orig.)

 
 
 
 
81

Delayed-enhancement MRI of apical hypertrophic cardiomyopathy: assessment of the intramural distribution and comparison with clinical symptoms, ventricular arrhythmias, and cine MRI  

International Nuclear Information System (INIS)

Background: Hypertrophic cardiomyopathy (HCM) is reported to show patchy midwall myocardial hyper enhancement on delayed-enhancement magnetic resonance imaging (DE-MRI). The intramural distribution of myocardial hyper enhancement and its correlation with clinical symptoms, ventricular arrhythmias, and cardiac function have not been described for symptomatic apical HCM. Purpose: To evaluate the features and significance of myocardial hyper enhancement on DE-MRI in symptomatic apical HCM. Material and Methods: Thirteen patients with symptomatic apical HCM and their 65 apical segments were investigated. Myocardial hyper enhancement and regional and global functional parameters were determined with MRI. We investigated the intramural distribution and frequencies of this myocardial hyper enhancement and compared them with the patients' clinical symptoms, the presence of ventricular arrhythmias, and cine MRI. Results: Eight (61.5%) patients with symptomatic apical HCM displayed apical myocardial hyper enhancement, and 22 (33.8%) of the 65 apical segments examined showed myocardial hyper enhancement. Of the myocardial hyper enhancement observed, 81.8% showed a subendocardial pattern.The Hyperenhanced apical myocardium had a lower percentage of systolic myocardial thickening, and was associated with serious symptoms (e.g. syncope) and ventricular arrhythmias. Conclusion: Patients with symptomatic apical HCM showed myocardial hyper enhancement involving the subendocardial layeancement involving the subendocardial layer, which might be related to regional systolic dysfunction, serious clinical symptoms, and ventricular arrhythmias

82

Delayed-enhancement MRI of apical hypertrophic cardiomyopathy: assessment of the intramural distribution and comparison with clinical symptoms, ventricular arrhythmias, and cine MRI  

Energy Technology Data Exchange (ETDEWEB)

Background: Hypertrophic cardiomyopathy (HCM) is reported to show patchy midwall myocardial hyper enhancement on delayed-enhancement magnetic resonance imaging (DE-MRI). The intramural distribution of myocardial hyper enhancement and its correlation with clinical symptoms, ventricular arrhythmias, and cardiac function have not been described for symptomatic apical HCM. Purpose: To evaluate the features and significance of myocardial hyper enhancement on DE-MRI in symptomatic apical HCM. Material and Methods: Thirteen patients with symptomatic apical HCM and their 65 apical segments were investigated. Myocardial hyper enhancement and regional and global functional parameters were determined with MRI. We investigated the intramural distribution and frequencies of this myocardial hyper enhancement and compared them with the patients' clinical symptoms, the presence of ventricular arrhythmias, and cine MRI. Results: Eight (61.5%) patients with symptomatic apical HCM displayed apical myocardial hyper enhancement, and 22 (33.8%) of the 65 apical segments examined showed myocardial hyper enhancement. Of the myocardial hyper enhancement observed, 81.8% showed a subendocardial pattern.The Hyperenhanced apical myocardium had a lower percentage of systolic myocardial thickening, and was associated with serious symptoms (e.g. syncope) and ventricular arrhythmias. Conclusion: Patients with symptomatic apical HCM showed myocardial hyper enhancement involving the subendocardial layer, which might be related to regional systolic dysfunction, serious clinical symptoms, and ventricular arrhythmias

Amano, Yasuo; Fukushima, Yoshimitsu; Kumita, Shinichiro (Dept. of Radiology, Nippon Medical School, Tokyo (Japan)), email: yas-amano@nifty.com; Takayama, Morimasa (Dept. of Cardiology, Sakakibara Heart Inst., Tokyo (Japan)); Kitamura, Mitsunobu (Coronary Care Unit, Chiba-Hokuso Hospital of Nippon Medical School, Chiba (Japan))

2011-07-15

83

MRI findings in intramuscular lipomas  

Energy Technology Data Exchange (ETDEWEB)

Objective. To investigate the spectrum of magnetic resonance (MR) findings of intramuscular lipoma. Design and patients. A retrospective review of 17 consecutive cases of intramuscular lipoma examined with MR imaging was undertaken. Features assessed included the size and margin of the mass; the homogeneity of the contents, including the presence or absence of intermingled muscle fibers; whether the mass was uninodular or multinodular; and the presence of linear structures between and within the tumor nodules. Three well-differentiated liposarcomas and one dedifferentiated liposarcoma associated with lipoma-like components were also studied to allow a comparison of the benign and malignant lesions. Results. The diameter of the intramuscular lipomas varied from less than 3 cm to more than 10 cm. Ten of the intramuscular lipomas were homogeneous but the remaining seven were inhomogeneous with intermingled muscle fibers within the mass. The intramuscular lipomas were well defined in 12 cases, and infiltrative in five. In one case the margin of the lesion showed prominent infiltration of the surrounding muscle tissue. Of the 17 cases of intramuscular lipoma, 15 were composed of a single nodule, whereas three of four cases of liposarcoma were composed of multinodular masses. Conclusion. The MR findings of intramuscular lipoma varied from a small, single and homogeneous mass identical to ordinary (superficial) lipoma, to a large, inhomogeneous lesion with an infiltrative margin. The presence of infiltrative margins and intermingled muscle fibers in intramuscular lipoma indicates a benign lesion rather than malignancy. In addition, uninodularity of the mass is helpful in differentiating intramuscular lipoma from well-differentiated liposarcoma. (orig.) With 8 figs., 2 tabs., 17 refs.

Matsumoto, K.; Hukuda, Sinsuke; Ishizawa, Michihito; Chano, Tokuhiro [Dept. of Orthopaedic Surgery, Shiga University of Medical Science, Otsu (Japan); Okabe, Hidetoshi [Division of Surgical Pathology, Shiga University of Medical Science, Otsu (Japan)

1999-03-01

84

Study on MRI findings in postresuscitation brains  

International Nuclear Information System (INIS)

We evaluated chronological changes in T1/T2-weighted and diffusion-weighted magnetic resonance imaging (MRI) findings in patients with global cerebral ischemia compared to computed tomography (CT) and single photon emission computed tomography (SPECT) to determine the advantages this presents in determining a patient's prognosis. We retrospectively studied MRI in 28 patients resuscitated after cardiopulmonary arrest. Patients were divided by outcome into 4 groups -- good outcome in 5, moderate disability in 2, vegetative in 17, and 4 brain-dead. Those with good recovery had normal CT and MRI findings. Those with moderate disability demonstrated high signal intensity in basal ganglia and posterior cerebral cortex during the chronic period. All vegetative patients had abnormal CT findings and their T2-weighted images during the acute period demonstrated high signal intensity in the cerebral cortex and basal ganglia; T1-weighted image during the chronic period showed similar findings, while diffusion-weighted images indicated high signal intensity in the cerebral cortex from the very acute period, during which abnormal findings were seen in the cortex, putamen, and thalamus more frequently than in T2-weighted images. Moreover, regional cerebral blood flow significantly decreased during the chronic period. All brain-dead patients had CT findings of diffuse cerebral edema and loss of density difference between gray and white matter. T2-weighted images respectively showed a. T2-weighted images respectively showed an extraordinary high density difference between gray and white matter and diffusion-weighted images high signal density in the whole brain. MRI detects chronologic changes in postresuscitation brain damage better than CT findings. Diffusion-weighted images identify hypoxic-ischemic lesions during the very acute period. MRI thus appears useful in evaluating patient prognosis and care. (author)

85

Peristalsis gap sign at cine magnetic resonance imaging for diagnosing strangulated small bowel obstruction. Feasibility study  

International Nuclear Information System (INIS)

The aim of this study was to determine the feasibility of cine magnetic resonance imaging (MRI) for diagnosing strangulated small bowel obstruction (SBO). This study included 38 patients with clinically confirmed SBO who had undergone cine MRI. Cine MRI scans were evaluated regarding the presence of the 'peristalsis gap sign' (referring to an akinetic or severely hypokinetic closed loop), indicating strangulation. Computed tomography (CT) was performed in 34 of 38 patients with (n=25) or without (n=9) contrast enhancement. CT images were evaluated using a combination of criteria (presence of hyperattenuation, poor contrast enhancement, mesenteric edema, wall thickening, massive ascites) indicating strangulation. Sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) of cine MRI and CT for the diagnosis of strangulation were calculated and compared using surgical findings and the clinical course as the reference standard. Sensitivity, specificity, PPV, and NPV of cine MRI were 100%, 92.9%, 83.3%, and 100%, respectively; and those of CT (of which 26.5% was performed without contrast enhancement) were 66.7%, 92.0%, 75.0%, and 88.5%, respectively. There was no significant difference in diagnostic accuracy between the two methods (P=0.375). Cine MRI is a feasible and promising technique for diagnosing strangulation. (author)

86

MRI and CT findings of intracranial neurosyphilis  

International Nuclear Information System (INIS)

To evaluate the CT and MRI findings of neurosyphilis. We retrospectively reviewed the CT and MR imaging findings in five patients with intracranial neurosyphilis confirmed by CSF, VDRL, TPHA, and clinical follow-up. MR imaging was performed in all five cases, and CT in two. The MRI and CT findings of intracranial neurosyphilis included infarction (n=3), focal inflammation (n=1) and encephalopathy (n=1). There was a total of ten infaretions : three of the basal ganglia, two each of the frontal lobe, watershed zone, and cerebellum, and one of the occipital lobe. Intaretion was most common in MCA territory (n=9; 50%), followed by the watershed zone (16.6%), posterior cerebral artery territory (16.6%), and posterior inferior cerebellar artery territory (11.1%). The size of the lesion varied from 1cm to larger than one lobe. One patient showed diffuse high signal intensity in the left temporal lobe, but on follow-up MRI, this had resolved. The most common finding of neurosyphilis, as seen on MRI and CT, was infarction in middle cerebral arterial territory

87

MRI and CT findings of intracranial neurosyphilis  

Energy Technology Data Exchange (ETDEWEB)

To evaluate the CT and MRI findings of neurosyphilis. We retrospectively reviewed the CT and MR imaging findings in five patients with intracranial neurosyphilis confirmed by CSF, VDRL, TPHA, and clinical follow-up. MR imaging was performed in all five cases, and CT in two. The MRI and CT findings of intracranial neurosyphilis included infarction (n=3), focal inflammation (n=1) and encephalopathy (n=1). There was a total of ten infaretions : three of the basal ganglia, two each of the frontal lobe, watershed zone, and cerebellum, and one of the occipital lobe. Intaretion was most common in MCA territory (n=9; 50%), followed by the watershed zone (16.6%), posterior cerebral artery territory (16.6%), and posterior inferior cerebellar artery territory (11.1%). The size of the lesion varied from 1cm to larger than one lobe. One patient showed diffuse high signal intensity in the left temporal lobe, but on follow-up MRI, this had resolved. The most common finding of neurosyphilis, as seen on MRI and CT, was infarction in middle cerebral arterial territory.

Suh, Hong Kil; Shim, Ya Seong; Kim, Seon Bok; Kim, Uk Jung; Lee, Shin Ho; Jung, Hae Kyuong; Lee, Eil Seong; Kang, Ik Won [Hallym University College of Medicine, Seoul (Korea, Republic of); Cho, Hyeun Cha [Sungkyunkwan University College of Medicine, Seoul (Korea, Republic of)

1999-02-01

88

Towards radiological diagnosis of abdominal adhesions based on motion signatures derived from sequences of cine-MRI images.  

Science.gov (United States)

This paper reports novel development and preliminary application of an image registration technique for diagnosis of abdominal adhesions imaged with cine-MRI (cMRI). Adhesions can severely compromise the movement and physiological function of the abdominal contents, and their presence is difficult to detect. The image registration approach presented here is designed to expose anomalies in movement of the abdominal organs, providing a movement signature that is indicative of underlying structural abnormalities. Validation of the technique was performed using structurally based in vitro and in silico models, supported with Receiver Operating Characteristic (ROC) methods. For the more challenging cases presented to the small cohort of 4 observers, the AUC (area under curve) improved from a mean value of 0.67 ± 0.02 (without image registration assistance) to a value of 0.87 ± 0.02 when image registration support was included. Also, in these cases, a reduction in time to diagnosis was observed, decreasing by between 20% and 50%. These results provided sufficient confidence to apply the image registration diagnostic protocol to sample magnetic resonance imaging data from healthy volunteers as well as a patient suffering from encapsulating peritoneal sclerosis (an extreme form of adhesions) where immobilization of the gut by cocooning of the small bowel is observed. The results as a whole support the hypothesis that movement analysis using image registration offers a possible method for detecting underlying structural anomalies and encourages further investigation. PMID:24439767

Fenner, John; Wright, Benjamin; Emberey, Jonathan; Spencer, Paul; Gillott, Richard; Summers, Angela; Hutchinson, Charles; Lawford, Pat; Brenchley, Paul; Bardhan, Karna Dev

2014-06-01

89

MRI findings of treated bacterial septic arthritis  

International Nuclear Information System (INIS)

The purpose of this study was to report the MRI findings that can be encountered in successfully treated bacterial septic arthritis. The study included 12 patients (8 male and 4 female; mean age 38 years, range 9-85) with 13 proven cases of bacterial septic arthritis. The joints involved were hip (n = 3), knee (n = 3), shoulder (n = 2), sacroiliac (n = 2), ankle (n = 1), wrist (n = 1), and elbow (n = 1). MRI examinations following surgical debridement and at initiation of antibiotic therapy and after successful treatment were compared for changes in effusion, synovium, bone, and periarticular soft tissues. Imaging findings were correlated with microbiological and clinical findings. Joint effusions were present in all joints at baseline and regressed significantly at follow-up MRI (p = 0.001). Abscesses were present in 5 cases (38 %), and their sizes decreased significantly at follow-up (p = 0.001). Synovial enhancement and thickening were observed in all joints at both baseline and follow-up MRI. Myositis/cellulitis was present in 10 cases (77 %) at baseline and in 8 cases (62 %) at follow-up MRI. Bone marrow edema was present in 10 joints (77 %) at baseline and persisted in 8 joints (62 %). Bone erosions were found in 8 joints (62 %) and persisted at follow-up MRI in all cases. The sizes of joint effusions and abscesses appear to be the factors with the most potential for monitoring therapy for septic arthritis, since both decreased significantly following successfulcreased significantly following successful treatment. Synovial thickening and enhancement, periarticular myositis/cellulitis, and bone marrow edema can persist even after resolution of the infection. (orig.)

90

MRI findings of treated bacterial septic arthritis  

Energy Technology Data Exchange (ETDEWEB)

The purpose of this study was to report the MRI findings that can be encountered in successfully treated bacterial septic arthritis. The study included 12 patients (8 male and 4 female; mean age 38 years, range 9-85) with 13 proven cases of bacterial septic arthritis. The joints involved were hip (n = 3), knee (n = 3), shoulder (n = 2), sacroiliac (n = 2), ankle (n = 1), wrist (n = 1), and elbow (n = 1). MRI examinations following surgical debridement and at initiation of antibiotic therapy and after successful treatment were compared for changes in effusion, synovium, bone, and periarticular soft tissues. Imaging findings were correlated with microbiological and clinical findings. Joint effusions were present in all joints at baseline and regressed significantly at follow-up MRI (p = 0.001). Abscesses were present in 5 cases (38 %), and their sizes decreased significantly at follow-up (p = 0.001). Synovial enhancement and thickening were observed in all joints at both baseline and follow-up MRI. Myositis/cellulitis was present in 10 cases (77 %) at baseline and in 8 cases (62 %) at follow-up MRI. Bone marrow edema was present in 10 joints (77 %) at baseline and persisted in 8 joints (62 %). Bone erosions were found in 8 joints (62 %) and persisted at follow-up MRI in all cases. The sizes of joint effusions and abscesses appear to be the factors with the most potential for monitoring therapy for septic arthritis, since both decreased significantly following successful treatment. Synovial thickening and enhancement, periarticular myositis/cellulitis, and bone marrow edema can persist even after resolution of the infection. (orig.)

Bierry, Guillaume; Huang, Ambrose J.; Chang, Connie Y.; Torriani, Martin; Bredella, Miriam A. [Massachusetts General Hospital and Harvard Medical School, Musculoskeletal Imaging and Intervention, Department of Radiology, Boston, MA (United States)

2012-12-15

91

Isovaleric acidaemia: cranial CT and MRI findings  

Energy Technology Data Exchange (ETDEWEB)

Isovaleric acidaemia is an inborn error of leucine metabolism due to deficiency of isovaleryl-CoA dehydrogenase, which results in accumulation of isovaleric acid in body fluids. There are acute and chronic-intermittent forms of the disease. We present the cranial CT and MRI findings of a 19-month-old girl with the chronic-intermittent form of isovaleric acidaemia. She presented with severe metabolic acidosis, hyperglycaemia, glycosuria, ketonuria and acute encephalopathy. Cranial CT revealed bilateral hypodensity of the globi pallidi. MRI showed signal changes in the globi pallidi and corticospinal tracts of the mesencephalon, which were hypointense on T1-weighted and hyperintense on T2-weighted images. (orig.)

Sogut, Ayhan; Acun, Ceyda; Tomsac, Nazan; Demirel, Fatma [Department of Paediatrics, Karaelmas University, Zonguldak (Turkey); Aydin, Kubilay [Department of Radiology, Istanbul Medical School, Istanbul University, Camlikyolu, B. mehmetpasa sokak yavuz apt. No:10/10, Etiler, Istanbul (Turkey); Aktuglu, Cigdem [Department of Paediatrics, Cerrahpasa Medical School, Istanbul University, Istanbul (Turkey)

2004-02-01

92

Isodense subdural haematomas on CT: MRI findings  

International Nuclear Information System (INIS)

MRI findings are described in two patients with subdural haematomas isodense on CT. In one patient, admitted 6 weeks after trauma, a chronic subdural haematoma showed extreme hypointensity on T2-weighted images, suggesting acute trauma, and therefore acute rebleeding. In the second patient with severe anaemia, an acute subdural haematoma was hyperintense on T2-weighted images, suggesting chronic trauma; this may be explained by the low haematocrit and a possible mixture of blood with cerebrospinal fluid. The MRI features of subdural haematomas and hygromas have to be kept in mind, in order not to misjudge the age of the haematoma. (orig.)

93

Isodense subdural haematomas on CT: MRI findings  

Energy Technology Data Exchange (ETDEWEB)

MRI findings are described in two patients with subdural haematomas isodense on CT. In one patient, admitted 6 weeks after trauma, a chronic subdural haematoma showed extreme hypointensity on T2-weighted images, suggesting acute trauma, and therefore acute rebleeding. In the second patient with severe anaemia, an acute subdural haematoma was hyperintense on T2-weighted images, suggesting chronic trauma; this may be explained by the low haematocrit and a possible mixture of blood with cerebrospinal fluid. The MRI features of subdural haematomas and hygromas have to be kept in mind, in order not to misjudge the age of the haematoma. (orig.).

Wilms, G.; Marchal, G.; Geusens, E.; Raaijmakers, C. (Univ. Hospitals K.U. Leuven (Belgium). Dept. of Radiology); Calenbergh, F. van; Goffin, J.; Plets, C. (Univ. Hospitals K.U. Leuven (Belgium). Dept. of Neurosurgery)

1992-11-01

94

MRI Findings in Patients with TMJ Click  

Directory of Open Access Journals (Sweden)

Full Text Available Introduction: It has been shown that joint click, an initial and common finding in internal derangement (ID, respond to neither conservative treatment nor surgical intervention. This raises the question as to whether it must be treated in the absence of other pertinent signs and symptoms, so the aim of this study was to investigate and compare the MRI findings of TMJ in both normal subjects and patients with click, in order to determine the importance of click in predicting TMJ pathological changes. Methods: A total of 26 patients with clinical symptoms of disk displacement with reduction (DDwR according to RDC/TMD were compared to 14 normal subjects in terms of their MRI findings, including disk displacement, effusion, condylar osteoarthritic changes and disk deformities. Results: Out of 80 joints in total (52 affected joints in 26 patients and 28 joints in control group, 48 were shown with normal disk position in MRI whereas 28 (35% and 4 (5% were categorised as DDwR and (disk displacement without reduction DDwoR, respectively. Statistically significant correlations were established between the following pairs of variables in order: Click and disk displacement, effusion and disk displacement, disk displacement and effusion with disk deformity. Conclusion: The correlation between the presence of click and disk displacement, disk deformity and effusion emphasizes the importance of MRI for an accurate diagnosis and development of an appropriate treatment plan in these cases and shows that clinical examination is not sufficient for these purposes.

Mahrokh Imanimoghaddam

2013-12-01

95

Intracranial teratoma in childhood: MRI findings  

International Nuclear Information System (INIS)

We reviewed the magnetic resonance imaging(MRI) of intracranial teratoma to defect the characteristic findings. Five patients with intercranial teratoma were evaluated with MRI from January 1988 to December 1990. Four male and one female patients with age ranging from 6 to 14 years were surgically confirmed. MRI was done with 2.0 T superconducting system(Spectro 20000, Goldstar, Seoul) and gadolinium enhancement was done in 4 patients. We retrospectively reviewed the clinical, operative, pathologic, and radiologic findings. Intracranial teratomas showed fatty component, calcification and cystic component filled with sebum or serous fluid. Peripheral rim enhancement was seen in three and irregular enhancement in two cases. There were hydrocephalus in all pineal teratoma, but neither surrounding edema nor surrounding tissue invasion was seen. Low signal intensity rim was noted the solid component of all tumors and they were not enhanced. MRI showed multicomponent of intracranial teratoma including the solid and cystic component, and low signal rim which might be the characteristic finding of the intracranial teratoma

96

CT and MRI findings of sarcomatoid cholangiocarcinoma  

Science.gov (United States)

Abstract Computed tomography (CT) and magnetic resonance imaging (MRI) findings for a case of intrahepatic sarcomatoid cholangiocarcinoma is presented. A 48-year-old man with upper abdominal pain underwent contrast-enhanced CT and MRI. A 13?×?10?×?7?cm mass was seen in the left liver lobe, which had hypodense internal architecture on CT and mixed signal intensities on both T1- and T2-weighted images with an overwhelmingly hypointense signal on T1-weighted images and a hyperintense signal on T2-weighted images. The lesion had heterogeneous enhancement on both CT and MRI. A satellite nodule with the same imaging features was distinctive for the lesion. PMID:23092855

Toprak, Huseyin; Sennur Bilgin, S.; Kondakci, Mustafa; Balci, Cem

2012-01-01

97

MRI findings of achilles tendon rupture  

International Nuclear Information System (INIS)

Objective: To evaluate the MRI findings of achilles tendon rupture. Methods: The MRI data of 7 patients with achilles tendon rupture were retrospectively analysed. All 7 patients were male with the age ranging from 34 to 71 years. Routine MR scanning was performed in axial and sagittal planes, including T1WI, T2WI and a fat suppression MRI (SPIR). Results: Among 7 patients, complete achilles tendon rupture was seen in 6 cases, partial achilles tendon rupture 1 case. The site of tendon disruption were 2.6-11.0 cm( mean 5.4 cm) proximal to the insertion in the calcaneus. The MRI findings of a partial or complete rupture of the achilles tendon included enlarged and thickened achilles tendon (7 cases), wavy lax achilles tendon (2 cases), discontinuity of some or all of its fibers and intratendinous regions of increased signal intensity (7 cases). In the cases of complete tendon rupture, the size of the tendinous gap varied from 3.0-8.0 mm, which was filled with blood and appeared as edema of increase signal intensity on T2WI and SPIR. In all 7 patients, MR scanning showed medium signal intensity (7 cases) on T1WI, or medium signal intensity (1 cases), medium-high signal intensity (3 cases ), high signal intensity (3 cases) on T2WI, and medium-high signal intensity (2 cases), high signal intensity (5 cases) on fat suppression MRI. The preachilles fat pad showed obscure in 6 cases of complete achilles tendon rupture. Coes of complete achilles tendon rupture. Conclusion: MRI is an excellent method for revealing achilles tendon rupture and confirming the diagnosis. (authors)

98

Extended MRI findings of intersection syndrome  

International Nuclear Information System (INIS)

The symptoms and physical findings of intersection syndrome have been well described in the clinical medical literature. However, the magnetic resonance imaging (MRI) findings in patients with intersection syndrome of the forearm have only recently been described in a small number of patients. We review our experience with imaging of intersection syndrome, describe previously unreported MRI findings, and emphasize modifications to MRI protocols for its evaluation. Institutional review board approval was obtained for this retrospective review of patients with MRI findings consistent with intersection syndrome of the forearm during the period from January 2004 to September 2006. Six patients were identified, three males and three females, with an average age of 39.3 years. The MRI examinations were reviewed to assess signal abnormalities within and adjacent to the first and second dorsal extensor tendon compartments (DETC): tendinosis, peritendinous edema or fluid, muscle edema, subcutaneous edema, and juxtacortical edema. The overall longitudinal extent of signal alterations was measured as well as the distance from Lister's tubercle to the crossover of the first and second DETC. Review of the MRIs showed increased intrasubstance tendon signal suggesting tendinosis in two of the six patients, peritendinous edema or fluid in all six patients, muscle edema in five of the six patients, and subcutaneous edema in three of the six patients. Juxtacortical edema was seen in ontients. Juxtacortical edema was seen in one patient. Peritendinous edema or fluid extended distally beyond the radiocarpal joint in three of the six patients. The average distance from Lister's tubercle to the crossover of the first and second DETC was 3.95 cm, in keeping with recently published data. Intersection syndrome is an uncommon MRI diagnosis. In addition to the previously described MRI findings of edema adjacent to the first or second DETC, possibly with proximal extension and subcutaneous edema, we have identified additional abnormalities: tendinosis, muscle edema, and juxtacortical edema. In addition, our review shows that first and second DETC signal abnormalities in patients with intersection syndrome are not necessarily limited to the site of crossover but can extend distally beyond the radiocarpal joint. As standard wrist protocols may not include the area of intersection between the first and second DETC, coverage may need to be extended to the mid-forearm. (orig.)

99

Assessment of left ventricular function with single breath-hold highly accelerated cine MRI combined with guide-point modeling  

International Nuclear Information System (INIS)

Purpose: To prospectively assess the performance of highly accelerated cine MRI in multi-orientations combined with a new guide-point modeling post-processing technique (GPM approach) for assessment of left ventricular (LV) function compared to the standard summation of slices method based on a stack of short axis views (SoS approach). Materials and methods: 33 consecutive patients were examined on a 1.5 T scanner with a standard steady state free precession (SSFP) sequence (TR, 3.0 ms; TE, 1.5 m; flip angle (FA), 60o; acceleration factor (AF), 2) analyzed with the SoS method and a highly accelerated, single breath-hold temporal parallel acquisition SSFP sequence (TR, 4.6 ms; TE, 1.1 ms; AF, 3) post-processed with the GPM method. LV function values were measured by two independent readers with different experience in cardiac MRI and compared by using the paired t-test and F-test. Inter- and intraobserver agreements were calculated using Bland-Altman-Plots. Results: Mean acquisition and post-processing time was significantly shorter with the GPM approach (15 s/3 min versus 360 s/6 min). For all LV function parameters interobserver agreement between the experienced and non-experienced reader was significantly improved when the GPM approach was used. However, end-diastolic and end-systolic volumes were larger for the GPM technique when compared to the SoS method (P 0.121). In both r equivalent results (P > 0.121). In both readers and for all parameters variances did not differ significantly (P ? 0.409) and the two approaches showed an excellent linear correlation (r > 0.951). Conclusion: Due to its accurate, fast and reproducible assessment of LV function parameters highly accelerated MRI combined with the GPM technique may become the technique of first choice for assessment of LV function in clinical routine.

100

Assessment of left ventricular function with single breath-hold highly accelerated cine MRI combined with guide-point modeling  

Energy Technology Data Exchange (ETDEWEB)

Purpose: To prospectively assess the performance of highly accelerated cine MRI in multi-orientations combined with a new guide-point modeling post-processing technique (GPM approach) for assessment of left ventricular (LV) function compared to the standard summation of slices method based on a stack of short axis views (SoS approach). Materials and methods: 33 consecutive patients were examined on a 1.5 T scanner with a standard steady state free precession (SSFP) sequence (TR, 3.0 ms; TE, 1.5 m; flip angle (FA), 60{sup o}; acceleration factor (AF), 2) analyzed with the SoS method and a highly accelerated, single breath-hold temporal parallel acquisition SSFP sequence (TR, 4.6 ms; TE, 1.1 ms; AF, 3) post-processed with the GPM method. LV function values were measured by two independent readers with different experience in cardiac MRI and compared by using the paired t-test and F-test. Inter- and intraobserver agreements were calculated using Bland-Altman-Plots. Results: Mean acquisition and post-processing time was significantly shorter with the GPM approach (15 s/3 min versus 360 s/6 min). For all LV function parameters interobserver agreement between the experienced and non-experienced reader was significantly improved when the GPM approach was used. However, end-diastolic and end-systolic volumes were larger for the GPM technique when compared to the SoS method (P < 0.001), whereas ejection fraction estimation yielded equivalent results (P > 0.121). In both readers and for all parameters variances did not differ significantly (P {>=} 0.409) and the two approaches showed an excellent linear correlation (r > 0.951). Conclusion: Due to its accurate, fast and reproducible assessment of LV function parameters highly accelerated MRI combined with the GPM technique may become the technique of first choice for assessment of LV function in clinical routine.

Heilmaier, Christina, E-mail: christina.heilmaier@uni-due.d [Department of Diagnostic and Interventional Radiology and Neuroradiology, University Hospital Essen (Germany); Nassenstein, Kai, E-mail: kai.nassenstein@uni-due.d [Department of Diagnostic and Interventional Radiology and Neuroradiology, University Hospital Essen (Germany); Nielles-Vallespin, Sonia, E-mail: sonia.nielles-vallespin@siemens.co [Siemens AG Healthcare Sector, MED MR PLM AW Cardiology, Erlangen (Germany); Zuehlsdorff, Sven, E-mail: sven.zuehlsdorff@siemens.co [Siemens AG Healthcare Sector, Cardiovascular MR Research and Development, Chicago (United States); Hunold, Peter, E-mail: peter.hunold@uni-due.d [Department of Diagnostic and Interventional Radiology and Neuroradiology, University Hospital Essen (Germany); Barkhausen, Joerg, E-mail: joerg.barkhausen@uk-sh.d [Department of Diagnostic and Interventional Radiology and Neuroradiology, University Hospital Essen (Germany)

2010-06-15

 
 
 
 
101

MRI findings and diagnosis of brain echinococcus  

International Nuclear Information System (INIS)

Objective: To study the characteristic findings of brain echinococcosis on MRI. Methods: The MRI findings of 18 patients with pathologically confirmed brain echinococcosis were retrospectively reviewed. Results: Among the patients, there were 9 cases of cystic echinococcosis and 9 cases of alveolar echinococcosis. In cystic echinococcosis, MRI revealed homogeneously hypointensity on T1WI and hyperintensity on T2WI, while it showed low signal intensity inside the cysts on FLAIR and DWI. In 6 cases of cystic echinococcosis, no edema was detected surrounding the lesions, while edema resulting from cyst rupture was found in 3 cases. The cystic walls were visible in 6 cases, obscure in 3 cases. The ruptured hydatid cysts in 3 cases showed slight ring enhancement. Alveolar echinococcosis appeared as multiple lesions with isointensity on T1WI and hypointensity on T2WI, surrounded by vasogenic edema. The 'charcoal-like' hypointensity and innumerous hyperintense bubbles of 1-10 mm in diameter inside the lesions on T2-weighted MR images were characteristic for lesions of alveolar echinococcosis. The lesions revealed hypointensity on DWI and showed irregular ring enhancement after injection of Gd-DTPA. Perfusion-weighted MR imaging revealed low relative cerebral blood volume. Conclusion: MRI can demonstrate lesions of brain echinococcosis accurately due to its advantages of multiorientation and multiparameter. It is clinically valuable. (authors)

102

MRI findings of Ramsay Hunt syndrome  

International Nuclear Information System (INIS)

Objective: To investigate the MR findings and diagnostic value in Ramsay Hunt syndrome. Methods: MRI plain and Gd-DTPA enhanced scans were performed in 5 unilateral Ramsay Hunt syndrome patients proved by clinical representation and examinations. The patients included 3 men and 2 women, and their age ranged from 29 to 54 years. The signal intensities of segments of facial nerves within temporal bone were measured pre- and post-gadolinium injections in 3 cases. Of all 5 cases, bilateral contrast of segments of facial nerves at both pre- and post-gadolinium injections was made. Results: Segmental enhancement was found in 4 cases (the difference of bilateral enhancement signal intensities>20, or the grade of difference is 1 or above), while no difference of bilateral enhancement was found in 1 case. Abnormal enhancement of ganglion geniculi (4/4) and labyrinthine segment (3/4) was relatively frequent, abnormal enhancement of distal part of internal auditory segment, tympanic segment, and mastoid segment was seen in 2 cases, respectively. Conclusion: MRI doesn't have diagnostic value unless the enhancement of segments of the affected facial nerve side is more evident than the unaffected side for unilateral cases. Labyrinthine segment and ganglion geniculi are more susceptible to Ramsay Hunt syndrome. Gd-DTPA enhanced MRI can demonstrate segmental lesions of facial nerves objectively, thus it can be helpful in the diagnosis and differential diagnosis of Ramsay Hunt syndromferential diagnosis of Ramsay Hunt syndrome. The relationship between MRI findings and clinical representation still needs further study

103

Gastrointestinal stromal tumors: CT and MRI findings  

International Nuclear Information System (INIS)

The objective of this study was to report the CT and MRI appearances of primary and metastatic gastrointestinal stromal tumor (GIST). The clinical and imaging findings of 31 patients with histological and immunohistochemical diagnosis of GIST were reviewed. The CT and MRI findings were assessed independently for size, location, enhancement characteristics, and pattern of metastatic disease. The tumors were of enteric (n=13), gastric (n=12), duodenal (n=2), and rectal (n=3) origin. In one case the primary site was the mesentery, without involvement of bowel. Primary tumors were typically exophytic (79%), larger than 5 cm (84%), and inhomogeneously enhancing (84%). Central necrosis of all tumors (37%) and aneurysmal dilation of enteric tumors (33%) were less common. Metastases were most commonly to mesentery (26%) or liver (32%). Less common findings were ascites (7%) and omental caking (3%). Liver metastases were hypervascular in 92% of patients and rapidly became cystic following therapy with imatinib mesylate (Gleevec; Novartis, East Hanover, NJ, USA). Lung metastases, bowel obstruction, vascular invasion, and significant lymphadenopathy were not seen in any patient. GISTs have some specific CT findings which could help differentiate them from other gastrointestinal tumors. Liver metastases became cystic following therapy, mimicking simple cysts. MRI was better than single-phase CT for assessing liver metastases, while CT was more sensitive for mesenteric metastases. more sensitive for mesenteric metastases. (orig.)

104

CT and MRI findings of olfactory neuroblastoma  

International Nuclear Information System (INIS)

Objective: To summary the CT and MRI imaging findings of olfactory neuroblastoma. Methods: Sixteen cases of olfactory neuroblastoma proved by surgery and pathology were collected. The radiological findings of CT and MRI were retrospectively analyzed. Results: Three lesions were postoperative recurrence. Three lesions located in the nose, the other 13 were located the middle-back part of the nose, infiltrating the sinuses such as maxillary and ethmoid sinus. Five lesions eroded the skull base and infiltrated into the brain. Another 5 lesions infiltrated the orbit. Calcification and ossification were present in 3 cases. The density or signal intensity of the masses was heterogeneous with marked enhancement after contrast administration. Conclusion: Olfactory neuroblastoma often located in the middle-back of the nose, with malignant signs of infiltrating the sinuses, orbit, and brain, and with obvious enhancement. (authors)

105

Lead arthropathy: radiographic, CT and MRI findings  

Energy Technology Data Exchange (ETDEWEB)

Lead arthropathy is a well-known complication of gunshot injuries with retained intra-articular bullets. Although several previous reports have discussed the radiological findings of this entity, computed tomography (CT) and magnetic resonance imaging (MRI) findings have never been described before in this setting. In this paper the authors review the imaging findings of 11 patients with lead arthropathy (1 of whom had clinical signs of lead poisoning as well), all of them studied by means of radiographs. In addition, non-enhanced CT scans were obtained in 3 patients and gadolinium-enhanced MRI in 1. Classic findings of intra-articular speckled lead deposits (occasionally with a ''lead arthrogram'' appearance), joint space narrowing and preserved bone density were found at radiographs in the great majority of cases. Furthermore, extension of intra-articular lead to adjacent tendon sheaths was observed in almost half of the patients, an observation rarely reported in the literature. CT scans and MRI, in their turn, were superior with regard to soft tissue abnormalities, accurately depicting joint effusion and the thickened synovium with lead particles embedded in it. Post-gadolinium MRI had the advantage of showing the enhancement pattern of the inflamed synovium and associated bone marrow edema pattern. Although it is not possible to establish the role of axial imaging in lead arthropathy from the small number of cases studied, this initial experience shows that both methods hold promise in this setting and may be useful, at least in selected cases. (orig.)

Fernandes, Joao Luiz [Image Memorial, Magnetic Resonance Department, Salvador-BA (Brazil); Lopes Rocha, Arthemizio Antonio [Hospital das Clinicas de Brasilia, Diagnostik, Brasilia - DF (Brazil); Veloso Ayrimoraes Soares, Mayra [Hospital Universitario de Brasilia (UnB), Radiology Department, Brasilia - DF (Brazil); Lopes Viana, Sergio [Hospital das Clinicas de Brasilia, Diagnostik, Brasilia - DF (Brazil); Clinica Radiologica Vila Rica, Magnetic Resonance Department, Brasilia - DF (Brazil)

2007-07-15

106

Brain MRI findings of neuropsychiatric lupus  

International Nuclear Information System (INIS)

To evaluate the brain MRI findings in patients with neuropsychiatric lupus. In 26 patients (M:F = 2:24 ; aged 9-48 years) in whom the presence of systemic lupus erythematosus was clinically or pathologically proven and in whom neuropsychiatric lupus was also clinically diagnosed, the findings of brain MRI were retrospectively evaluated. MR images were analyzed with regard to the distribution, location, size and number of lesions due to cerebral ischemia or infarction, the presence of cerebral atrophy, and the extent and degree of brain parenchymal and intravascular enhancement. The most common MRI findings were lesions due to cerebral ischemia or infarction occurring in 18 patients (69%), and located within deep periventricular white matter (n=10), subcortical white matter (n=8), the cerebral cortex (n=7), basal ganglia (n=7), or brain stem or cerebellum (n=2). The lesions were single (n=3) or multiple (n=15), and in 17 patients were less than 1cm in diameter in regions other than the cerebral cortex. In six of these patients, lesions of 1-4cm in diameter in this region were combined, and one occurred in the cerebral cortex only. Cerebral atrophy was seen in 16 patients (62%), in ten of whom there was no past history of treatment with steroids for more than six months. In 15 patients (58%), contrast-enhanced MR image revealed diffuse enhancement of the basal ganglia or intravascular enhancement. In no case were MRI findings normal. The primary mainfestations of neuroprmal. The primary mainfestations of neuropsychiatric lupus are multifocal ischemia or infarctions in the cerebral cortex, and subcortical and deep white matter, and the cerebral atrophy. Contrast-enhanced MR images also demonstrated diffuse enhancement of the basal ganglia and intravascular enhancement, both thought to be related to the congestion due to the stagnation of cerebral blood flow

107

MRI findings of cervical lymphadenopathy: Preliminary study  

International Nuclear Information System (INIS)

The purpose of this study is to evaluate findings in MRI which maybe useful in differential diagnosis of cervical lymph node enlargement. We retrospectively analyzed the MRI findings of cervical lymph node enlargement in surgically proven 13 patients. We analyzed the location, size and shape, signal intensity, margin between node and surrounding structures degree and pattern of contrast enhancement. No disease specificity in location and size of lymphadenopathy was demonstrated in MRI. Most lymph nodes shows isointensity or slightly increased signal intensity to adjacent muscle on T1WI and high signal intensity on T2WI. Most of the cases showed contrast enhancement with metastatic lymph node showing ring-like and/or patchy enhancement. Tuberculous lymphadenopathy showed homogeneous or rather thick walled ring-like enhancement and one or multiple central nonenhancing portions of eccentrical location in the node. Relatively homogeneous enhancements were noted on reactively lymphoid hyperplasia, Lymphoma and Castleman's disease. MR imaging was helpful in differentiation of cervical lymph node enlargements. Tuberculous lymphadenopathy showed characteristic findings of rather spherical shaped, thick walled ring enhancement and multiple eccentrically located central nonenhancing portions

108

Extra-mammary findings in breast MRI  

Energy Technology Data Exchange (ETDEWEB)

Incidental extra-mammary findings in breast Magnetic Resonance Imaging (MRI) may be benign in nature, but may also represent a metastasis or another important lesion. We aimed to analyse the prevalence and clinical relevance of these unexpected findings. A retrospective review of 1535 breast MRIs was conducted. Only axial sequences were reassessed. Confirmation examinations were obtained in all cases. 285 patients had a confirmed incidental finding, which were located in the liver (51.9%), lung (11.2%), bone (7%), mediastinal lymph nodes (4.2%) or consisted of pleural/pericardial effusion (15.4%). 20.4% of incidental findings were confirmed to be malignant. Positive predictive value for MRI to detect a metastatic lesion was high if located within the bone (89%), lymph nodes (83%) and lung (59%), while it was low if located within the liver (9%) or if it consisted of pleural/pericardial effusion (6%). The axial enhanced sequence showed superior sensitivity to unenhanced images in detecting metastatic lesions, especially if only smaller ({<=}10 mm.) lesions were considered. The prevalence of metastatic incidental extra-mammary findings is not negligible. Particular attention should be to incidental findings located within the lung, bone and mediastinal lymph nodes. (orig.)

Rinaldi, Pierluigi; Costantini, M.; Belli, P.; Giuliani, M.; Bufi, E.; Fubelli, R.; Distefano, D.; Romani, M.; Bonomo, L. [Catholic University - Policlinic A. Gemelli, Department of Bio-Imaging and Radiological Sciences, Rome (Italy)

2011-11-15

109

Reconstruction of Undersampled Cardiac Cine MRI data Using Compressive Sensing Principles  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Reduction of MRI data acquisition time is an important goal in the MRI field. Undersampling k-t space is a solution to reduce acquisition time. MR images may have sparse or compressible presentations in appropriate transform domains, such as wavelets. According to the Compressive Sensing (CS) theory, they can be recovered from randomly undersampled k-t space data that guarantees incoherency between sparsifying transform and sampling operator. However, pure random k-space sampling can be more ...

Zamani, Pooria; Soltanian-zadeh, Hamid

2009-01-01

110

Comparison between fast MR flow quantification in breathhold technique in ascending aorta and pulmonary trunc with right and left ventricular cine-MRI for the assessment of stroke volumes in healthy volunteers  

International Nuclear Information System (INIS)

Purpose: Evaluation of accordance and reproducibility of the stroke volume assessment of fast flow measurement in breathhold technique in the ascending aorta and pulmonary trunc with fast right (RV) and left ventricular (LV) cine-MRI. Material and Methods: The correlation an accordance of stroke volumes (SV) were evaluated by flow measurements in the ascending aorta and pulmonary trunc and RV and LV volumetric cine-MRI in 33 cardiac healthy volunteers. Interobserver and intraobserver variability of the different measurement methods and locations were checked in 10 cardiac healthy volunteers. Results: With respect to the early systolic flow and the extrapolation of the endiastolic flow rate the difference in SV was smaller than 1,5 ml/m2 for all possible combinations. The interobserver and intraobserver variabilities of flow measurements were significantly lower by approximately a factor of 2.5 than those of RV and LV cine-MRI. Conclusion: The accordance of fast prospective triggered flow measurements in the ascending aorta and pulmonary trunc with RV and LV cine-MRI can be achieved with reasonable limits of agreement. Flow measurements are more reproducible than cine-MRI. (orig.)

111

Characterization of Pancreatic Tumor Motion Using Cine MRI: Surrogates for Tumor Position Should Be Used With Caution  

International Nuclear Information System (INIS)

Purpose: Our current understanding of intrafraction pancreatic tumor motion due to respiration is limited. In this study, we characterized pancreatic tumor motion and evaluated the application of several radiotherapy motion management strategies. Methods and Materials: Seventeen patients with unresectable pancreatic cancer were enrolled in a prospective internal review board-approved study and imaged during shallow free-breathing using cine MRI on a 3T scanner. Tumor borders were agreed on by a radiation oncologist and an abdominal MRI radiologist. Tumor motion and correlation with the potential surrogates of the diaphragm and abdominal wall were assessed. These data were also used to evaluate planning target volume margin construction, respiratory gating, and four-dimensional treatment planning for pancreatic tumors. Results: Tumor borders moved much more than expected. To provide 99% geometric coverage, margins of 20 mm inferiorly, 10 mm anteriorly, 7 mm superiorly, and 4 mm posteriorly are required. Tumor position correlated poorly with diaphragm and abdominal wall position, with patient-level Pearson correlation coefficients of -0.18-0.43. Sensitivity and specificity of gating with these surrogates was also poor, at 53%-68%, with overall error of 35%-38%, suggesting that the tumor may be underdosed and normal tissues overdosed. Conclusions: Motion of pancreatic tumor borders is highly variable between patients and larger than expected. There is substantial deformahan expected. There is substantial deformation with breathing, and tumor border position does not correlate well with abdominal wall or diaphragmatic position. Current motion management strategies may not account fully for tumor motion and should be used with caution.

112

Clinical and MRI findings of brucellar spondylodiscitis  

International Nuclear Information System (INIS)

Objective: The aim of this retrospective study was to report the clinical features and MR imaging findings of patients with brucellar spondylodiscitis. Materials and methods: Twenty-two patients with spondylodiscitis, recruited among 152 patients with brucellosis referred from the Department of Infectious Diseases. Patients were diagnosed based on positive clinical findings, ?1/160 titers of brucella agglutination tests and/or positive blood cultures. Magnetic resonance imaging (MRI) was performed to all of the patients with spondylodiscitis. Signal changes and enhancement of vertebral bodies, involvement of paravertebral soft tissues and epidural spaces, nerve root and cord compression and abscess formation were assessed. Results: All of the patients (n = 22; 7 F, 15 M) had ?1/160 titers of brucella agglutination test and blood culture was positive in 9. A great majority of the patients had involvement at only one vertebrae level (n = 21, 95.5%), whereas one patient (4.5%) had multilevel involvement. In MRI, eight patients had soft tissue involvement and three had abscess formation. All cases had vertebral and discal enhancement. Additionally epidural extension was detected in four cases, posterior longitudinal ligament (PLL) elevation in five cases and root compression in two cases. Conclusion: Brucella is still a public health problem in endemic areas. MRI is a highly sensitive and non-invasive imaging technique which should be first choice of imaging in the ead be first choice of imaging in the early diagnosis of spondylodiscitis

113

Clinical and MRI findings of brucellar spondylodiscitis  

Energy Technology Data Exchange (ETDEWEB)

Objective: The aim of this retrospective study was to report the clinical features and MR imaging findings of patients with brucellar spondylodiscitis. Materials and methods: Twenty-two patients with spondylodiscitis, recruited among 152 patients with brucellosis referred from the Department of Infectious Diseases. Patients were diagnosed based on positive clinical findings, {>=}1/160 titers of brucella agglutination tests and/or positive blood cultures. Magnetic resonance imaging (MRI) was performed to all of the patients with spondylodiscitis. Signal changes and enhancement of vertebral bodies, involvement of paravertebral soft tissues and epidural spaces, nerve root and cord compression and abscess formation were assessed. Results: All of the patients (n = 22; 7 F, 15 M) had {>=}1/160 titers of brucella agglutination test and blood culture was positive in 9. A great majority of the patients had involvement at only one vertebrae level (n = 21, 95.5%), whereas one patient (4.5%) had multilevel involvement. In MRI, eight patients had soft tissue involvement and three had abscess formation. All cases had vertebral and discal enhancement. Additionally epidural extension was detected in four cases, posterior longitudinal ligament (PLL) elevation in five cases and root compression in two cases. Conclusion: Brucella is still a public health problem in endemic areas. MRI is a highly sensitive and non-invasive imaging technique which should be first choice of imaging in the early diagnosis of spondylodiscitis.

Bozgeyik, Zulkif [Department of Radiology, Faculty of Medicine, Firat University, 23119 Elazig (Turkey)], E-mail: bozgeyik4@hotmail.com; Ozdemir, Huseyin [Department of Radiology, Faculty of Medicine, Firat University, 23119 Elazig (Turkey); Demirdag, Kutbettin; Ozden, Mehmet [Department of Infection Disease, Faculty of Medicine, Firat University, Elazig (Turkey); Sonmezgoz, Fitnet [Department of Radiology, Faculty of Medicine, Firat University, 23119 Elazig (Turkey); Ozgocmen, Salih [Division of Rheumatology, Department of PMR, Faculty of Medicine, Firat University, Elazig (Turkey)

2008-07-15

114

Non-infectious ischiogluteal bursitis: MRI findings  

Energy Technology Data Exchange (ETDEWEB)

We wished to report on the MRI findings of non-infectious ischiogluteal bursitis. The MRI findings of 17 confirmed cases of non-infectious ischiogluteal bursitis were analyzed: four out of the 17 cases were confirmed with surgery, and the remaining 13 cases were confirmed with MRI plus the clinical data. The enlarged bursae were located deep to the gluteus muscles and postero-inferior to the ischial tuberosity. The superior ends of the bursal sacs abutted to the infero-medial aspect of the ischial tuberosity. The signal intensity within the enlarged bursa on T1-weighted image (WI) was hypo-intense in three cases (3/17, 17.6%), iso-intense in 10 cases (10/17, 58.9%), and hyper-intense in four cases (4/17, 23.5%) in comparison to that of surrounding muscles. The bursal sac appeared homogeneous in 13 patients (13/17, 76.5%) and heterogeneous in the remaining four patients (4/17, 23.5%) on T1-WI. On T2-WI, the bursa was hyper-intense in all cases (17/17, 100%); it was heterogeneous in 10 cases and homogeneous in seven cases. The heterogeneity was variable depending on the degree of the blood-fluid levels and the septae within the bursae. With contrast enhancement, the inner wall of the bursae was smooth (5/7 cases), and irregular (12/17 cases) because of the synovial proliferation and septation. Ischiogluteal bursitis can be diagnosed with MRI by its characteristic location and cystic appearance.

Cho, Kil Ho; Jang, Han Won [Yeungnam University College of Medicine, Daegu (Korea, Republic of); Lee, Sung Moon [Keimyung University College of Medicine, Daegu (Korea, Republic of); Lee, Young Hwan [Daegu Hyosung Catholic University College of Medicine, Daegu (Korea, Republic of); Suh, Kyung Jin [Suh and Joo MR Clinic, Seoul (Korea, Republic of); Kim, Sung Moon; Shin, Myung Jin [University of Ulsan College of Medicine, Seoul (Korea, Republic of)

2004-12-15

115

Non-infectious ischiogluteal bursitis: MRI findings  

International Nuclear Information System (INIS)

We wished to report on the MRI findings of non-infectious ischiogluteal bursitis. The MRI findings of 17 confirmed cases of non-infectious ischiogluteal bursitis were analyzed: four out of the 17 cases were confirmed with surgery, and the remaining 13 cases were confirmed with MRI plus the clinical data. The enlarged bursae were located deep to the gluteus muscles and postero-inferior to the ischial tuberosity. The superior ends of the bursal sacs abutted to the infero-medial aspect of the ischial tuberosity. The signal intensity within the enlarged bursa on T1-weighted image (WI) was hypo-intense in three cases (3/17, 17.6%), iso-intense in 10 cases (10/17, 58.9%), and hyper-intense in four cases (4/17, 23.5%) in comparison to that of surrounding muscles. The bursal sac appeared homogeneous in 13 patients (13/17, 76.5%) and heterogeneous in the remaining four patients (4/17, 23.5%) on T1-WI. On T2-WI, the bursa was hyper-intense in all cases (17/17, 100%); it was heterogeneous in 10 cases and homogeneous in seven cases. The heterogeneity was variable depending on the degree of the blood-fluid levels and the septae within the bursae. With contrast enhancement, the inner wall of the bursae was smooth (5/7 cases), and irregular (12/17 cases) because of the synovial proliferation and septation. Ischiogluteal bursitis can be diagnosed with MRI by its characteristic location and cystic appearance

116

Semi-quantitative evaluation of aortic valve insufficiency by means of cine MRI compared with colour Dopplerecho-cardiography and cardio-angiography  

International Nuclear Information System (INIS)

A simple, reliable semi-quantitative method for evaluating aortic valve insufficiency by means of cine MR is described. Ten normal persons and 36 patients with aortic valve abnormalities were examined in a 1.5 Tesla apparatus using ECG-triggered gradient echo sequences. The heart was imaged along its short axis. Semi-quantitative evaluation of aortic valve insufficiency was calculated from an MRI index, which depends on the diameter of the aortic regurgitant jet and on its length; the results were compared with colour Doppler echo-cardiography and cardio-angiography. The MRI index showed better correlation with cardio-angiography (r = 0.92) than the correlation between the colour Doppler echo-cardiography and cardio-angiography (r = 0.78). Over and under estimates are less common with MRI than with colour Doppler echo-cardiography. MRI showed very little inter-observer variability (r = 0.96, p <0.001). Cine MR is a reliable method for demonstrating aortic valve insufficiency. Using the short axis of the heart, rapid semi-quantitative evaluation of the aortic regurgitant jet is regularly possible. (orig.)

117

MRI Findings in Spinal Canal Stenosis  

Directory of Open Access Journals (Sweden)

Full Text Available Spinal canal stenosis results from progressive narrowing of the central spinal canal and the lateral recesses. Primary (congenital lumbar spinal stenosis is associated with achondroplastic dwarfism. The spinal canal may become narrowed by bulging or protrusion of the intervertebral disc annulus, herniation of the nucleus pulposus posteriorly, thickening of the posterior longitudinal ligament, hypertrophy of the facet joints, hypertrophy of the ligamentum flavum, epidural fat deposition, spondylosis of the intervertebral disc margins and uncovertebral joint hypertrophy in the neck. The central canal and the neurorecess may be compromised by tumor infiltration, such as metastatic disease, or by infectious spondylitis."nAP diameter of the normal adult cervical canal has a mean value of 17-18 mm at vertebral levels C3-5. The lower cervical canal measures 12-14 mm. Cervical stenosis is associated with an AP diameter of less than 10 mm. The thoracic spinal canal varies from 12 to 14 mm in diameter in the adult. The diameter of the normal lumbar spinal canal varies from 15 to 27 mm. Lumbar stenosis results from a spinal canal diameter of less than 12 mm in some patients; a diameter of 10 mm is definitely stenotic."nSpinal MRI is the most suitable technique for the diagnosis of spinal stenosis. The examination should be performed using thin sections (3 mm and high resolution, including the axial and sagittal planes using T1-weighted, proton-density, and T2-weighted techniques. The bony and osteophytic components are seen best using a T2-weighted gradient-echo technique."nOn MRI, findings of spinal stenosis have a variable presentation depending on the specific disease. The goal of spinal imaging is to localize the site and level of disease and to help differentiate between conditions in which patients require surgery or conservative treatment."nIn this presentation, different kinds of spinal canal stenosis and their MRI findings would be discussed.

Maryam Barzin

2010-05-01

118

Early MRI findings of rapidly destructive coxarthrosis  

International Nuclear Information System (INIS)

Rapidly destructive coxarthrosis (RDC) is known to affect elderly women, but its etiology is unknown. This is the first report to our knowledge, based on a search of the English literature, that reveals the entire process of hip destruction from the onset to the terminal stage of RDC, in an 80-year-old woman. Radiographic evaluation showed subchondral insufficiency fracture of the femoral head at an early stage of this disease. An MRI examination within a month of the onset of hip pain showed the entire femoral head with low intensity on T1-weighted images and high intensity on T2-weighted images, and a small low-intensity band at the subchondral area of the lateral weight-bearing portion of the head. These findings are consistent with subchondral insufficiency fracture and associated bone marrow edema. The lesion developed into a deep and large erosion at the superolateral portion of the femoral head, the process being observed on both roentgenograms and MRI. These findings were confirmed during total hip arthroplasty. This case suggests that subchondral insufficiency fracture of the femoral head may be a preceding sign of destruction of the femoral head. (orig.)

119

Early MRI findings of rapidly destructive coxarthrosis  

Energy Technology Data Exchange (ETDEWEB)

Rapidly destructive coxarthrosis (RDC) is known to affect elderly women, but its etiology is unknown. This is the first report to our knowledge, based on a search of the English literature, that reveals the entire process of hip destruction from the onset to the terminal stage of RDC, in an 80-year-old woman. Radiographic evaluation showed subchondral insufficiency fracture of the femoral head at an early stage of this disease. An MRI examination within a month of the onset of hip pain showed the entire femoral head with low intensity on T1-weighted images and high intensity on T2-weighted images, and a small low-intensity band at the subchondral area of the lateral weight-bearing portion of the head. These findings are consistent with subchondral insufficiency fracture and associated bone marrow edema. The lesion developed into a deep and large erosion at the superolateral portion of the femoral head, the process being observed on both roentgenograms and MRI. These findings were confirmed during total hip arthroplasty. This case suggests that subchondral insufficiency fracture of the femoral head may be a preceding sign of destruction of the femoral head. (orig.)

Watanabe, Wataru; Itoi, Eiji; Yamada, Shin [Department of Orthopedic Surgery, Akita University School of Medicine (Japan)

2002-01-01

120

Brain MRI findings of carbon disulfide poisoning  

International Nuclear Information System (INIS)

To evaluate the findings of brain MRI in patients with carbon disulfide poisoning. Ninety-one patients who had suffered carbon disulfide poisoning [male:female=87:4; age, 32-74 (mean 53.3) years] were included in this study. To determine the extent of white matter hyperintensity (Grade 0-V) and lacunar infarction, T2-weighted MR imaging of the brain was performed. T2-weighted images depicted white matter hyperintensity in 70 patients (76.9%) and lacunar infarcts in 27 (29.7%). In these patients, the prevalent findings at T2-weighted MR imaging of the brain were white matter hyperintensity and lacunar infarcts. Disturbance of the cardiovascular system by carbon disulfide might account for these results

 
 
 
 
121

CT and MRI findings of malignant meningiomas  

International Nuclear Information System (INIS)

The authors dealt with 128 cases of meningiomas during the 11-year period between January 1980 and December 1990. Of these cases, 11 (8.6%) were malignant meningiomas and included 4 cases of the anaplastic type, 1 atypical type, 1 papillary type and 5 of the meningotheliomatous type. The recurrences of these meningiomas seen within 5 years following the initial operation were of almost the same size as the original tumors. The 11 malignant meningiomas were evaluated by CT and 6 (4 anaplastic meningiomas, 1 atypical and 1 meningotheliomatous type) of them were examined by MR. CT on the malignant meningiomas revealed that tumor density was homogeneous, showing isodensity or slight high density in 7 cases and heterogeneous density with hypodensity in isodensity or slight high density on plain CT and heterogeneous enhancement on CECT in 4 cases. Only 2 malignant meningiomas exhibited calcifications on CT. Perifocal edema in the malignant meningiomas was not increased to a greater extent than in benign meningiomas. Moderate or somewhat more than moderate edema was seen in 6 cases (55%) of the 11 cases and slight edema in 5. MRI was more efficient than CT in the evaluation of the pathological tumor characteristics of the malignant meningiomas. T2-weighted images were important in determining heterogeneity of the tumor signal with respect to characteristic pathological findings. Five of 6 malignant tumors showed a heterogeneous signal on T2-weighted imaneous signal on T2-weighted image and Gd-DTPA T1 image. Irregularities in the tumor outline were recognized in all 6 malignant meningioma cases examined. In 5 cases the peritumoral band, frequently seen by MRI in benign meningiomas had disappeared. MR was more useful than CT for the diagnosis of malignant meningiomas. The heterogeneity of the tumor signal, the irregularity of tumor outline and the disappearance of the peritumoral band were of importance in establishing the usefulness of MRI for the diagnosis of malignant meningiomas. (author)

122

Peritoneal mesothelioma: CT and MRI findings  

International Nuclear Information System (INIS)

Two patients with histologically proven diagnosis of peritoneal mesothelioma are presented. Both patients had CT scans of the abdomen. The second patient was also examined with MRI. Although imaging findings are striking, they are non-specific and diagnosing peritoneal mesothelioma in the absence of pleural calcification or pleural plaque on chest radiograph or CT is difficult. However, it is possible to suggest the correct diagnosis in a patient with the presence of non-calcified omental and peritoneal infiltration or masses without liver secondaries or lymphadenopathy. Magnetic resonance imaging with its multi-planar capabilities is a highly sensitive non-invasive modality in the evaluation of malignant peritoneal mesothelioma and can demonstrate the exact site and clarify whether the mass is arising from the peritoneal surface or within a visceral organ. Copyright (2002) Blackwell Science Pty Ltd

123

CINE CLUB  

CERN Multimedia

Main Auditorium CERN jeudi 17 décembre 2009 à 18 h 15 à l’Amphithéâtre principal du CERN (bâtiment 500)   Comme chaque année avant Noël, le CineClub du CERN est heureux d’inviter petits et grands à une projection gratuite du film   LE MONDE DE NEMO (FINDING NEMO) (USA, 2003, Andrew Stanton and Lee Unkrich)   Dans les eaux tropicales de la Grande Barrière de corail, un poisson-clown du nom de Marin mène une existence paisible avec son fils unique, Nemo. Redoutant l’océan et ses risques imprévisibles, il fait de son mieux pour protéger son fils. Comme tous les petits poissons de son âge, celui-ci rêve pourtant d’explorer les mystérieux récifs. Lorsque Nemo disparaît, Marin devient malgré lui le héros d’une qu&a...

Ciné Club

2009-01-01

124

MRI findings of traumatic cervical disc herniation  

International Nuclear Information System (INIS)

In general practice, disc hernia is increasingly being questioned about its relation with traffic injuries. In this study, we examined the image findings of cervical disc herniation for findings indicative of traumatic hernia. In 2008, we examined 35 cases of cervical disc herniation at our hospital by MRI. The patients were divided into two groups; patients with trauma history (19 cases) and those without (16 cases), and their images were compared. Disc herniation in the trauma group showed high intensity at T2, with some of the patients in this group also indicating continuous high intensity of the internal and herniated discs. Traumatic force was found to cause swelling under the laryngeal soft tissue. Cases with further flexion injury showed interspinous ligament hemorrhage. These findings strongly suggest the involvement of injury. But given that some younger patients in the non-trauma group also show high intensity at T2*, attention must be paid not to confuse swelling below the larynx with inflammation of the longus colli muscle. (author)

125

A methodology to accurately quantify patellofemoral cartilage contact kinematics by combining 3D image shape registration and cine-PC MRI velocity data.  

Science.gov (United States)

Patellofemoral osteoarthritis and its potential precursor patellofemoral pain syndrome (PFPS) are common, costly, and debilitating diseases. PFPS has been shown to be associated with altered patellofemoral joint mechanics; however, an actual variation in joint contact stresses has not been established due to challenges in accurately quantifying in vivo contact kinematics (area and location). This study developed and validated a method for tracking dynamic, in vivo cartilage contact kinematics by combining three magnetic resonance imaging (MRI) techniques, cine-phase contrast (CPC), multi-plane cine (MPC), and 3D high-resolution static imaging. CPC and MPC data were acquired from 12 healthy volunteers while they actively extended/flexed their knee within the MRI scanner. Since no gold standard exists for the quantification of in vivo dynamic cartilage contact kinematics, the accuracy of tracking a single point (patellar origin relative to the femur) represented the accuracy of tracking the kinematics of an entire surface. The accuracy was determined by the average absolute error between the PF kinematics derived through registration of MPC images to a static model and those derived through integration of the CPC velocity data. The accuracy ranged from 0.47 mm to 0.77 mm for the patella and femur and from 0.68 mm to 0.86 mm for the patellofemoral joint. For purely quantifying joint kinematics, CPC remains an analytically simpler and more accurate (accuracy contact kinematics, this combined imaging approach produces accurate results with minimal operator intervention. PMID:22284428

Borotikar, Bhushan S; Sipprell, William H; Wible, Emily E; Sheehan, Frances T

2012-04-01

126

Right-sided cardiac function in healthy volunteers measured by first-pass radionuclide ventriculography and gated blood-pool SPECT: comparison with cine MRI  

DEFF Research Database (Denmark)

BACKGROUND: Right ventricular (RV) function is of interest in an array of cardiopulmonary diseases. First-pass radionuclide ventriculography (FP), gated blood-pool single photon emission tomography (GBPS) and cardiac magnetic resonance imaging (MRI) are three currently used non-invasive methods for evaluation of right-sided cardiac function. The aim of our study was to compare the agreement between these methods when measuring right-sided cardiac function. METHODS: Twenty-four healthy volunteers were included. Mean age was 44 years (range: 25-60) and 29% were females. All participants had FP, GBPS and breath-hold cine MRI performed according to standard protocols. RESULTS: Normal ranges for RV ejection fraction (RVEF) defined as mean +/- 2SD were 0.49-0.72, 0.44-0.66 and 0.40-0.69 when measured by MRI, FP and GBPS respectively. Bland-Altman analysis showed a mean difference (bias) between MRI and FP of 0.05 (95% CI: 0.03-0.08) and of 0.06 (95% CI: 0.02-0.10) between MRI and GBPS. No systematic bias was found between FP and GBPS. Normal values for RV end-diastolic volume index (RVEDVI) were 37-95 and 29-91 ml m(-2) when measured by MRI and GBPS respectively. The mean difference between RVEDVI was 6 ml m(-2) (95% CI: 0-11). CONCLUSIONS: (i) Normal values of RVEF differ between MRI, FP and GBPS with wide limits of agreement, accordingly it is difficult to evaluate changes over time if measured by different methods, (ii) RV volumes are in the same range when measured by MRI or GBPS but with wide limits of agreement, and (iii) if MRI is considered gold standard then FP is more accurate than GBPS for RVEF measurements.

Kjaer, Andreas; Lebech, Anne-Mette

2005-01-01

127

MRI findings of intracranial cavernous malformations  

International Nuclear Information System (INIS)

To analyze the variable MRI features and clinical significance of intracranial cavernous malformations. Forty patients(mean age 35.4) with cavernous malformation were evaluated by MRI. Eleven patients were surgically confirmed. Cavernous malformations were divided into four categories on the basis of the MR imaging characteristics, especially on T2-weighted image. Type I lesion was defined as an extralesional subacute hemorrhage outside the low signal rim, type II as an intralesional hemorrhage surrounded by low signal rim, type III lesion as an intralesional thrombosis with variegated central core surrounded by low signal rim, and type IV lesion as a focal old hemorrhagic core with small low signal intensity. Type IV was further divided into IVa and IVb, whether the lesion has small iso-or hypersignal central core (IVa) or not (IVb). Follow-up MRI was evaluated in 12 patients who were managed conservatively. Follow-up intervals ranged from 2 weeks to 29 months (mean 6 months). Total 80 lesions were detected in 40 patients. Multiple lesions were noted in 10 patients. The topography of the cavernous malformations was supratentorial in 75% and infratentorial in 23%. There were 10 lesions in type I, 15 in type II, 21 in type III, 14 in type IVa, and 20 in type IVb. Type I lesions mainly showed mass effect and edema. Type III lesions showed minimal contrast enhancements in 7 lesions on delayed images. Type II lesions showed the characteristics of both type I and type III aracteristics of both type I and type III lesions. On follow up images, decrease in size in 5, change of type in 7, rebleeding in 2 and no change in 12 lesions were demonstrated. Hemorrhage, edema and mass effect were combined in the cases of rebleeding. On follow-up study, the estimated risk of bleeding was 32.3%/person-year and 13.7%/lesion-year. Cavernous malformations show as variable appearance, on MR imaging suggesting variable stages of evolution. The MR morphologic classification and evaluation of secondary findings are helpful to predict natural course and possibility of rebleeding of the lesion

128

MRI findings of intracranial cavernous malformations  

Energy Technology Data Exchange (ETDEWEB)

To analyze the variable MRI features and clinical significance of intracranial cavernous malformations. Forty patients(mean age 35.4) with cavernous malformation were evaluated by MRI. Eleven patients were surgically confirmed. Cavernous malformations were divided into four categories on the basis of the MR imaging characteristics, especially on T2-weighted image. Type I lesion was defined as an extralesional subacute hemorrhage outside the low signal rim, type II as an intralesional hemorrhage surrounded by low signal rim, type III lesion as an intralesional thrombosis with variegated central core surrounded by low signal rim, and type IV lesion as a focal old hemorrhagic core with small low signal intensity. Type IV was further divided into IVa and IVb, whether the lesion has small iso-or hypersignal central core (IVa) or not (IVb). Follow-up MRI was evaluated in 12 patients who were managed conservatively. Follow-up intervals ranged from 2 weeks to 29 months (mean 6 months). Total 80 lesions were detected in 40 patients. Multiple lesions were noted in 10 patients. The topography of the cavernous malformations was supratentorial in 75% and infratentorial in 23%. There were 10 lesions in type I, 15 in type II, 21 in type III, 14 in type IVa, and 20 in type IVb. Type I lesions mainly showed mass effect and edema. Type III lesions showed minimal contrast enhancements in 7 lesions on delayed images. Type II lesions showed the characteristics of both type I and type III lesions. On follow up images, decrease in size in 5, change of type in 7, rebleeding in 2 and no change in 12 lesions were demonstrated. Hemorrhage, edema and mass effect were combined in the cases of rebleeding. On follow-up study, the estimated risk of bleeding was 32.3%/person-year and 13.7%/lesion-year. Cavernous malformations show as variable appearance, on MR imaging suggesting variable stages of evolution. The MR morphologic classification and evaluation of secondary findings are helpful to predict natural course and possibility of rebleeding of the lesion.

Han, Byoung Hee; Kim, Dong Ik; Cho, Yong Kuk [Severance Hospital, Yonsei University, Seoul (Korea, Republic of)

1995-07-15

129

MRI and radiographic findings in Currarino's triad  

International Nuclear Information System (INIS)

Currarino's triad is a rare complex of a congential sacral bony abnormality, anorectal malformation and a presacral mass. Intractable constipation since birth is the leading symptom of this triad, which follows an autosomal dominant mode of heredity. We report conventional radiographic and MR findings in one family consisting of a mother and her two daughters. In all three cases, radiography revealed an abnormality of the os sacrum, the so-called scimitar sacrum. MR examination, undertaken next in our institution, was applied with T1-, T2- and proton density weighted sequences in all three orientations before and after i.v. application of gadolinium diethylene-triamine-pentaacetic acid (Gd-DTPA). In two patients we were able to diagnose the complete form of the triad and in one patient an incomplete form. In any case of a radiographically diagnosed scimitar sacrum in combination with constipation. Currarino's triad should be considered. MRI, as the method of choice, should be the next step to detect a presacral mass and any anomalies of the spinal canal. The importance of early recognition lies in the high morbidity and mortality rates resulting from this disorder. (orig.)

130

Acute haemorrhagic encephalomyelitis (AHEM): MRI findings.  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Acute disseminated encephalomyelitis (ADEM) comprises a group of demyelinating disorders of the CNS, of which a haemorrhagic variant indicates the most severe clinical course (AHEM). It is supposed to be caused by an overshooting immunological response following an infection or a vaccination. Restricted diffusion of protons could be demonstrated using DW-MRI in a case of rapidly progressive disease with additional haemorrhage. Hence, the addition of DWI adds to the diagnostic power of MRI in ...

Mader, I.; Wolff, M.; Niemann, G.; Ku?ker, W.

2004-01-01

131

Unilateral moya-moya disease: MRI findings  

International Nuclear Information System (INIS)

The term 'moya-moya' refers to hypertrophic collateral circulation in the basal ganglia, in patients with stenosis or occlusion of the distal internal carotid artery at its bifurcation. Recent reports stress the value of MRI in the demonstration of both collateral circulation and cerebral infarction in patients with moya-moya disease. We wish to report a case of MRI demonstration of unilateral moya-moya vessels in a 10-year-old child. (orig.)

132

MRI findings in thoracic outlet syndrome  

Energy Technology Data Exchange (ETDEWEB)

We discuss MRI findings in patients with thoracic outlet syndrome (TOS). A total of 100 neurovascular bundles were evaluated in the interscalene triangle (IS), costoclavicular (CC), and retropectoralis minor (RPM) spaces. To exclude neurogenic abnormality, MRIs of the cervical spine and brachial plexus (BPL) were obtained in neutral. To exclude compression on neurovascular bundles, sagittal T1W images were obtained vertical to the longitudinal axis of BPL from spinal cord to the medial part of the humerus, in abduction and neutral. To exclude vascular TOS, MR angiography (MRA) and venography (MRV) of the subclavian artery (SA) and vein (SV) in abduction were obtained. If there is compression on the vessels, MRA and MRV of the subclavian vessels were repeated in neutral. Seventy-one neurovascular bundles were found to be abnormal: 16 arterial-venous-neurogenic, 20 neurogenic, 1 arterial, 15 venous, 8 arterial-venous, 3 arterial-neurogenic, and 8 venous-neurogenic TOS. Overall, neurogenic TOS was noted in 69%, venous TOS in 66%, and arterial TOS in 39%. The neurovascular bundle was most commonly compressed in the CC, mostly secondary to position, and very rarely compressed in the RPM. The cause of TOS was congenital bone variations in 36%, congenital fibromuscular anomalies in 11%, and position in 53%. In 5%, there was unilateral brachial plexitis in addition to compression of the neurovascular bundle. Severe cervical spondylosis was noted in 14%, contributing to TOS symptoms. For evaluation of patients with TOS, visualization of the brachial plexus and cervical spine and dynamic evaluation of neurovascular bundles in the cervicothoracobrachial region are mandatory. (orig.)

Aralasmak, Ayse; Sharifov, Rasul; Kilicarslan, Rukiye; Alkan, Alpay [Bezmialem Vakif University, Department of Radiology, Fatih/Istanbul (Turkey); Cevikol, Can; Karaali, Kamil; Senol, Utku [Akdeniz University, Department of Radiology, Antalya (Turkey)

2012-11-15

133

Tarsal coalitions: CT and MRI findings  

International Nuclear Information System (INIS)

Objective: Tarsal coalition is a rare congenital disorder which represents the abnormal fusion of two or more tarsal bones. The purpose of this paper is to describe our experience with CT and MR in this articular disorder, helping to improve its diagnosis, which in many cases is missed. It is most often diagnosed when the tarsal region is examined for other reasons, than as a confirmation of a preliminary clinical diagnosis. Material and Method: Between January 1999 and May 2001, we studied 16 cases of tarsal coalitions, with CT and/or MR. A helical Toshiba K-press tomograph, a conventional TC 60-X tomograph (performing reconstruction algorithms with bone filter, and 2 mm sections per 2 mm of bed displacement) and a 1.5 Tessla Toshiba Visart MR equipment (axial, sagittal and coronal planes, with T1, T2-weighted, and T2 with fat suppression sequences) were used. Results: In the 16 cases evaluated, 28 tarsal coalitions were detected. Eight patients had bilateral coalitions (50%) and of the 8 remaining patients with unilateral disorders, 4 had 4 coexistent coalitions (25%). Eight bony bars were detected (28.5%) and 20 were non-ossified-cartilaginous and/or fibrous- (71.5%); 14 of them (50%) were talo-calcaneal, 8 (28.5%) were calcaneo-navicular, 4 (14.2%) were talo-navicular and 2 (7.1%) were cuboid-navicular coalitions. Conclusion: Calcaneo-navicular and talo-calcaneal coalitions account for approximately 80% of all cases. Conventional radiology is usually the initial mntional radiology is usually the initial method to study these lesions and often allows to make the diagnosis without the need for more complex methods. When the radiological findings are non-existent or misleading, CT or MRI may lead to a final diagnosis: to differentiate among the various subtypes and to assess the degree of articular involvement, which is mandatory in order to define the appropriate treatment. (author)

134

MRI findings in thoracic outlet syndrome  

International Nuclear Information System (INIS)

We discuss MRI findings in patients with thoracic outlet syndrome (TOS). A total of 100 neurovascular bundles were evaluated in the interscalene triangle (IS), costoclavicular (CC), and retropectoralis minor (RPM) spaces. To exclude neurogenic abnormality, MRIs of the cervical spine and brachial plexus (BPL) were obtained in neutral. To exclude compression on neurovascular bundles, sagittal T1W images were obtained vertical to the longitudinal axis of BPL from spinal cord to the medial part of the humerus, in abduction and neutral. To exclude vascular TOS, MR angiography (MRA) and venography (MRV) of the subclavian artery (SA) and vein (SV) in abduction were obtained. If there is compression on the vessels, MRA and MRV of the subclavian vessels were repeated in neutral. Seventy-one neurovascular bundles were found to be abnormal: 16 arterial-venous-neurogenic, 20 neurogenic, 1 arterial, 15 venous, 8 arterial-venous, 3 arterial-neurogenic, and 8 venous-neurogenic TOS. Overall, neurogenic TOS was noted in 69%, venous TOS in 66%, and arterial TOS in 39%. The neurovascular bundle was most commonly compressed in the CC, mostly secondary to position, and very rarely compressed in the RPM. The cause of TOS was congenital bone variations in 36%, congenital fibromuscular anomalies in 11%, and position in 53%. In 5%, there was unilateral brachial plexitis in addition to compression of the neurovascular bundle. Severe cervical spondylosis was noted in 14%, contributing to TOS sys was noted in 14%, contributing to TOS symptoms. For evaluation of patients with TOS, visualization of the brachial plexus and cervical spine and dynamic evaluation of neurovascular bundles in the cervicothoracobrachial region are mandatory. (orig.)

135

MRI Findings of Rectal Submucosal Tumors  

Energy Technology Data Exchange (ETDEWEB)

Rectal submucosal lesions encompass a wide variety of benign and malignant tumors involving the rectum. With optical colonoscopy, any mass-like protrusion covered by normal mucosa, whether the underlying process is intramural or extramural in origin, may be reported as a submucosal lesion. Whereas the assessment of submucosal lesions may be limited with performing optical colonoscopy, cross-sectional imaging such as CT, transrectal ultrasonography and MRI allows the evaluation of perirectal tissues and pelvic organs in addition to the entire thickness of the rectum, and so this is advantageous for the assessment of rectal submucosal tumors. Among these, MRI is the best investigative modality for soft tissue characterization. Therefore, knowledge of the MRI features of rectal submucosal tumors can help achieve accurate preoperative diagnoses and facilitate the appropriate management.

Kim, Hon Soul; Kim, Joo Hee; Lim, Joon Seok; Choi, Jin Young; Chung, Yong Eun; Park, Mi Suk; Kim, Myeong Jin; Kim, Ki Whang; Kim, Sang Kyum [Yonsei University Health System, Seoul (Korea, Republic of)

2011-08-15

136

MRI Findings of Rectal Submucosal Tumors  

International Nuclear Information System (INIS)

Rectal submucosal lesions encompass a wide variety of benign and malignant tumors involving the rectum. With optical colonoscopy, any mass-like protrusion covered by normal mucosa, whether the underlying process is intramural or extramural in origin, may be reported as a submucosal lesion. Whereas the assessment of submucosal lesions may be limited with performing optical colonoscopy, cross-sectional imaging such as CT, transrectal ultrasonography and MRI allows the evaluation of perirectal tissues and pelvic organs in addition to the entire thickness of the rectum, and so this is advantageous for the assessment of rectal submucosal tumors. Among these, MRI is the best investigative modality for soft tissue characterization. Therefore, knowledge of the MRI features of rectal submucosal tumors can help achieve accurate preoperative diagnoses and facilitate the appropriate management.

137

MRI Findings of Pericardial Fat Necrosis: Case Report  

International Nuclear Information System (INIS)

Pericardial fat necrosis is an infrequent cause of acute chest pain and this can mimic acute myocardial infarction and acute pericarditis. We describe here a patient with the magnetic resonance imaging (MRI) findings of pericardial fat necrosis and this was correlated with the computed tomography (CT) findings. The MRI findings may be helpful for distinguishing pericardial fat necrosis from other causes of acute chest pain and from the fat-containing tumors in the cardiophrenic space of the anterior mediastinum.

138

MRI Findings of Pericardial Fat Necrosis: Case Report  

Energy Technology Data Exchange (ETDEWEB)

Pericardial fat necrosis is an infrequent cause of acute chest pain and this can mimic acute myocardial infarction and acute pericarditis. We describe here a patient with the magnetic resonance imaging (MRI) findings of pericardial fat necrosis and this was correlated with the computed tomography (CT) findings. The MRI findings may be helpful for distinguishing pericardial fat necrosis from other causes of acute chest pain and from the fat-containing tumors in the cardiophrenic space of the anterior mediastinum.

Lee, Hyo Hyeok; Ryu, Dae Shick; Jung, Sang Sig; Jung, Seung Mun; Choi, Soo Jung; Shin, Dae Hee [Gangneung Asan Hospital, Ulsan University College of Medicine, Gangneung (Korea, Republic of)

2011-06-15

139

MRI findings in neuro-Behcet's disease  

International Nuclear Information System (INIS)

AIM: To evaluate the pattern and site of involvement in neuro-Behcet's disease (NBD). MATERIALS AND METHODS: Twenty-one patients with NBD were evaluated. Using 1.5T magnetic resonance imaging (MRI), T1-weighted axial and sagittal images, gadolinium enhanced axial and coronal images and T2-weighted axial images were obtained. RESULTS: The brainstem, basal ganglia, cerebral white matter, internal capsule, thalamus and spinal cord were involved in eighteen, nine, nine, seven, six and two patients, respectively. In nine patients with cerebral white matter involvement, four had subcortical involvement and three had periventricular involvement, in addition to two patients with focal deep white matter lesions. Among the brainstem lesions, pons involvement was seen in fourteen patients, all had ventrally located lesions, and nine had tegmental involvement. Midbrain involvement was seen in fourteen patients; the cerebral peduncle was involved in 11 of these. Five patients had brainstem atrophy: two cases were demonstrated at initial MRI, the other three cases were seen on follow-up MRI. Pyramidal signs, the most common neurological signs, were demonstrated in fourteen patients. Follow-up MRI was obtained 10 days to 20 months after the initial MRI in eight cases; all showed changes in size, shape and site of involvement. After gadolinium enhancement, thirteen patients demonstrated mottled non-confluent enhancement in the brainstem (eight patients), posterior limb of the internat patients), posterior limb of the internal capsule (three patients), pachymeninges (two patients) and spinal cord (two patients). CONCLUSION: NBD manifests a reversible course, but chronic NBD may result in brainstem atrophy. Characteristic involvement along the corticospinal tract is well correlated with neurological signs. Lee, S. H. et al. (2001)

140

Functional cine MRI of the abdomen for the assessment of implanted synthetic mesh in patients after incisional hernia repair: initial results  

Energy Technology Data Exchange (ETDEWEB)

The aim of our study was to develop a method that allows the vizualiation and evaluation of implanted mesh in patients after incisional hernia repair with MRI. Furthermore, we assessed problems typically related with mesh implantation like adhesions and muscular atrophy. We enrolled 28 patients after incisional hernia repair. In 10 patients mesh implantation was done by laparoscopy (expanded polytetrafluoroethylene=ePTFE mesh) and in 18 by laparotomy (polypropylene mesh). Functional MRI was performed on a 1.5-T system in supine position. Sagittal and axial TrueFISP images of the entire abdomen were acquired with the patient repeatedly straining. Evaluation included: correct position and intact fixation of the mesh, furthermore visceral adhesions, recurrent hernia and atrophy of the rectus muscle. The ePTFE mesh was visible in all cases; the polypropylene mesh was not detectable. In seven of the ten ePTFE meshes the fixation was not intact; two recurrent hernias were detected. Twenty of 28 patients had intraabdominal adhesions. In 5 cases mobility of the abdominal wall was reduced, and 16 patients showed an atropy of the rectus muscle. Functional cine MRI is a suitable method for follow-up studies in patients after hernia repair. ePTFE meshes can be visualized directly, and typical complications like intestinal adhesions and abdominal wall dysmotility can be assessed reliably. (orig.)

Fischer, Tanja [Ludwig-Maximilians-University Munich, Department of Clinical Radiology, Munich (Germany); Ludwig-Maximilians-University Munich, Department of Clinical Radiology, Klinikum Innenstadt, Munich (Germany); Ladurner, Roland; Mussack, Thomas [Ludwig-Maximilians-University Munich, Department of Surgery and Traumatology, Klinikum Innenstadt, Munich (Germany); Gangkofer, Alexander; Reiser, Maximilian; Lienemann, Andreas [Ludwig-Maximilians-University Munich, Department of Clinical Radiology, Munich (Germany)

2007-12-15

 
 
 
 
141

Functional cine MRI of the abdomen for the assessment of implanted synthetic mesh in patients after incisional hernia repair: initial results  

International Nuclear Information System (INIS)

The aim of our study was to develop a method that allows the vizualiation and evaluation of implanted mesh in patients after incisional hernia repair with MRI. Furthermore, we assessed problems typically related with mesh implantation like adhesions and muscular atrophy. We enrolled 28 patients after incisional hernia repair. In 10 patients mesh implantation was done by laparoscopy (expanded polytetrafluoroethylene=ePTFE mesh) and in 18 by laparotomy (polypropylene mesh). Functional MRI was performed on a 1.5-T system in supine position. Sagittal and axial TrueFISP images of the entire abdomen were acquired with the patient repeatedly straining. Evaluation included: correct position and intact fixation of the mesh, furthermore visceral adhesions, recurrent hernia and atrophy of the rectus muscle. The ePTFE mesh was visible in all cases; the polypropylene mesh was not detectable. In seven of the ten ePTFE meshes the fixation was not intact; two recurrent hernias were detected. Twenty of 28 patients had intraabdominal adhesions. In 5 cases mobility of the abdominal wall was reduced, and 16 patients showed an atropy of the rectus muscle. Functional cine MRI is a suitable method for follow-up studies in patients after hernia repair. ePTFE meshes can be visualized directly, and typical complications like intestinal adhesions and abdominal wall dysmotility can be assessed reliably. (orig.)

142

Unusual MRI findings in grey matter heteropia  

International Nuclear Information System (INIS)

We report unusual MRI patterns in patients with grey matter heterotopia. Standard T1- and T2-weighted spin-echo and inversion-recovery sequences were used in 22 patients presenting with seizures or developmental delay. The images were reviewed for signal change surrounding white matter and for atypical size, morphology or topography. We found 10 cases of subependymal heterotopias 11 of focal subcortical heterotopia and of diffuse subcortical heterotopia. On clinical or MRI grounds, 8 cases were considered unusual: 2 of the subependymal type, 2 of focal subcortical heterotopia with white matter abnormalities, 2 of focal subcortical heterotopia with no clinicoradiological correlation 1 of extensive hemispheric subcortical heterotopia and 1 of diffuse subcortical heterotopia confined to the frontal lobe. The classical classification of heterotopia enables easy radiological diagnosis even in cases with unusual patterns. In some cases, heterogeneity and high signal in surrounding white matter can be found. Cortical dysplasia is the most frequent associated malformation. (orig.)

143

MRI findings of cardiac tumors in childhood  

International Nuclear Information System (INIS)

Ten cases of cardiac tumor, detected by echocardiograms in childhood, were evaluated by using a 1.5T super-conductive magnetic resonance imager. Eight cases were with tuberous sclerosis, three of which were diagnosed as lipoma because of high intensity on T1 and T2 weighted images. The others were diagnosed as rhabdomyoma. It was difficult for echocardiograms to distinguish between the lipoma and the rhabdomyoma. MRI was very useful for the differential diagnosis of them. Two of ten cases were diagnosed as fibroma because of low intensity on T1 and T2 weighted images and inhomogeneous enhancement on Gd-DTPA enhanced T1 weighted image. MRI is a valuable tool for qualitative diagnosing cardiac tumors in childhood. (author)

144

MRI findings of cardiac tumors in childhood  

Energy Technology Data Exchange (ETDEWEB)

Ten cases of cardiac tumor, detected by echocardiograms in childhood, were evaluated by using a 1.5T super-conductive magnetic resonance imager. Eight cases were with tuberous sclerosis, three of which were diagnosed as lipoma because of high intensity on T1 and T2 weighted images. The others were diagnosed as rhabdomyoma. It was difficult for echocardiograms to distinguish between the lipoma and the rhabdomyoma. MRI was very useful for the differential diagnosis of them. Two of ten cases were diagnosed as fibroma because of low intensity on T1 and T2 weighted images and inhomogeneous enhancement on Gd-DTPA enhanced T1 weighted image. MRI is a valuable tool for qualitative diagnosing cardiac tumors in childhood. (author).

Sato, Shuhei; Hiraki, Yoshio; Kamata, Masahiro; Sato, Yasuko [Okayama Univ. (Japan). School of Medicine

1994-12-01

145

Non-traumatic peroneal nerve palsy: MRI findings  

International Nuclear Information System (INIS)

Aim: To present magnetic resonance imaging (MRI) findings of non-traumatic peroneal nerve palsy and to evaluate the usefulness of MRI in patients with non-traumatic peroneal nerve palsy. Materials and methods: In a retrospective study, 11 consecutive patients presenting with peroneal nerve palsy were included. MR images of the lower leg and electrophysiological examinations were also reviewed. The cause of peroneal nerve palsy was determined on the basis of MRI findings and was evaluated using electrophysiological data. Nine patients with causative lesions detected on MRI, underwent surgery. Results: Clinical examination and electromyography (EMG) disclosed 11 peroneal lesions. MRI and EMG revealed three types of signal intensity change, i.e. deep peroneal nerve palsy type, common peroneal nerve palsy type, and superficial peroneal nerve palsy type. The MRI and EMG findings were in agreement in seven (65%) of the 11 study patients. In nine patients the causative lesions were identified using MRI, including ganglion cyst (n = 6), osteochondroma (n = 1), synovial cyst (n = 1), and aneurysm (n = 1). Conclusion: Ganglion cyst is the most common cause of non-traumatic peroneal nerve palsy. MRI offers a noninvasive method for obtaining useful information to assess, localize, and monitor peripheral peroneal nerve palsy

146

MRI findings of intracranial cystic meningiomas  

Energy Technology Data Exchange (ETDEWEB)

Aim: To report the magnetic resonance imaging (MRI) features of intracranial cystic meningiomas and compare these features in intra- and peritumoural cyst groups. Materials and methods: Fourteen cases of peritumoural cystic meningiomas were compared with 18 cases of intratumoural cystic meningiomas. All patients were examined using non-enhanced and contrast-enhanced MRI. Tumour location, tumour size, signal intensity, enhancement characteristics, and cystic changes were assessed. The MRI features were compared between the intra- and peritumoural cyst groups. Results: Most cystic meningiomas comprised two or more cysts. The solid parts of the tumours showed moderate or marked enhancement after the injection of contrast material. An enhanced cyst wall was found in six out of 14 cases in the peritumoural cyst group, but not in the intratumoural cyst group. Peritumoural cystic meningiomas were predominately located in the cerebral falx, whereas the intratumoural cystic meningiomas were predominantly found in frontal convexity (X{sup 2} = 7.434, p = 0.024). The cysts were larger in the peritumoural cyst group than in the intratumoural cyst group (t = 5.274, p = 0.0258). Peritumoural oedema was more commonly found in the intratumoural cyst group (X{sup 2} = 6.863, p = 0.008). Cystic meningiomas with solid parts located inside the cyst are reported for the first time. Conclusion: Cystic meningiomas, although uncommon, should be differentiated from other cystic intracranial lesions. Peri- and intratumoural cystic meningiomas have distinct MRI features. The present study provides the first report of two lesions with solid parts located inside the cyst, as well as one lesion with a calcified solid nodule and haemorrhage within the cyst.

Zhang, D. [Department of Radiology, XinQiao Hosptial, Third Military Medical University, ChongQing 400037 (China); Hu, L.-B. [Department of Radiology, Second People' s Hospital of ChongQing, ChongQing (China); Zhen, J.W. [Department of Radiology and Biomedical Engineering, University of California, San Francisco, CA 94143 (United States); Zou, L.-G. [Department of Radiology, XinQiao Hosptial, Third Military Medical University, ChongQing 400037 (China); Feng, X.-Y. [Department of Radiology, HuaShan Hosptial, Medical Center of FuDan University, ShangHai (China); Wang, W.-X. [Department of Radiology, XinQiao Hosptial, Third Military Medical University, ChongQing 400037 (China); Wen, L. [Department of Radiology, XinQiao Hosptial, Third Military Medical University, ChongQing 400037 (China)], E-mail: cqzdwl@yahoo.com.cn

2009-08-15

147

MRI findings of intracranial cystic meningiomas  

International Nuclear Information System (INIS)

Aim: To report the magnetic resonance imaging (MRI) features of intracranial cystic meningiomas and compare these features in intra- and peritumoural cyst groups. Materials and methods: Fourteen cases of peritumoural cystic meningiomas were compared with 18 cases of intratumoural cystic meningiomas. All patients were examined using non-enhanced and contrast-enhanced MRI. Tumour location, tumour size, signal intensity, enhancement characteristics, and cystic changes were assessed. The MRI features were compared between the intra- and peritumoural cyst groups. Results: Most cystic meningiomas comprised two or more cysts. The solid parts of the tumours showed moderate or marked enhancement after the injection of contrast material. An enhanced cyst wall was found in six out of 14 cases in the peritumoural cyst group, but not in the intratumoural cyst group. Peritumoural cystic meningiomas were predominately located in the cerebral falx, whereas the intratumoural cystic meningiomas were predominantly found in frontal convexity (X2 = 7.434, p = 0.024). The cysts were larger in the peritumoural cyst group than in the intratumoural cyst group (t = 5.274, p = 0.0258). Peritumoural oedema was more commonly found in the intratumoural cyst group (X2 = 6.863, p = 0.008). Cystic meningiomas with solid parts located inside the cyst are reported for the first time. Conclusion: Cystic meningiomas, although uncommon, should be differentiated from other cystic intrd be differentiated from other cystic intracranial lesions. Peri- and intratumoural cystic meningiomas have distinct MRI features. The present study provides the first report of two lesions with solid parts located inside the cyst, as well as one lesion with a calcified solid nodule and haemorrhage within the cyst.

148

Solitary infantile choriocarcinoma of the liver: MRI findings  

International Nuclear Information System (INIS)

Infantile hepatic choriocarcinoma is a rare, highly malignant germ-cell tumour believed to result from a choriocarcinoma of the placenta that spreads to the child. Most infants present with a characteristic clinical picture of anaemia, hepatomegaly and precocious puberty. Imaging findings, including conventional MRI, may be non-specific. To improve the accuracy of diagnosis, we present the imaging findings of contrast-enhanced dynamic MRI in a 4.5-month-old boy with infantile hepatic choriocarcinoma. (orig.)

149

Solitary infantile choriocarcinoma of the liver: MRI findings  

Energy Technology Data Exchange (ETDEWEB)

Infantile hepatic choriocarcinoma is a rare, highly malignant germ-cell tumour believed to result from a choriocarcinoma of the placenta that spreads to the child. Most infants present with a characteristic clinical picture of anaemia, hepatomegaly and precocious puberty. Imaging findings, including conventional MRI, may be non-specific. To improve the accuracy of diagnosis, we present the imaging findings of contrast-enhanced dynamic MRI in a 4.5-month-old boy with infantile hepatic choriocarcinoma. (orig.)

Hoef, Marianne van der; Willi, Ulrich V.; Huisman, Thierry A.G.M. [University Children' s Hospital Zurich, Department of Diagnostic Imaging, Zurich (Switzerland); Niggli, Felix K. [University Children' s Hospital Zurich, Department of Paediatrics, Zurich (Switzerland)

2004-10-01

150

MRI findings in an adolescent with type I citrullinaemia  

International Nuclear Information System (INIS)

Citrullinaemia is a rare inborn error of urea cycle metabolism. We describe the MRI findings in a 16-year-old boy with type I citrullinaemia during an episode of acute hyperammonaemic encephalopathy and compare them to his previous follow-up MRI studies. MRI revealed bilateral high signal intensity in the cingulate, perirolandic, parietal and temporoinsular cortex, the subcortical white matter and left thalamus. Diffusion-weighted imaging showed high signal intensity and low apparent diffusion coefficient values in the frontoparietal lobes. To our knowledge, MRI findings in an adolescent with type I citrullinaemia have not been previously reported. Since our patient's neuroradiological findings showed greater similarity to type II citrullinaemia, we think his brain injury during this acute episode was probably age-related and independent of the type of citrullinaemia. (orig.)

151

Osmotic demyelination syndrome with a dysequilibrium syndrome: reversible MRI findings  

International Nuclear Information System (INIS)

Neurological disorders may be seen in end-stage renal disease patients due to uraemia or to complications of dialysis. A dysequilibrium syndrome may be seen, usually soon after or towards the end of haemodialysis. This group of patients has no particular findings on MRI. On the other hand, the osmotic demyelination syndrome has definitive MRI findings, not to date reported with the dysequilibrium syndrome. We report a patient with end-stage renal disease and the dysequilibrium syndrome who showed findings of osmotic demyelination on MRI. The patient had a convulsion after a first haemodialysis, with quadriparesis and hyperactive deep tendon reflexes and bilateral Babinski signs. The upper motor neurone signs lasted for a week. Meanwhile, he was also dysarthric and had dysphagia. He recovered neurologically without any residuum following appropriate treatment and there was improvement on MRI. (orig.)

152

MRI findings in an adolescent with type I citrullinaemia  

Energy Technology Data Exchange (ETDEWEB)

Citrullinaemia is a rare inborn error of urea cycle metabolism. We describe the MRI findings in a 16-year-old boy with type I citrullinaemia during an episode of acute hyperammonaemic encephalopathy and compare them to his previous follow-up MRI studies. MRI revealed bilateral high signal intensity in the cingulate, perirolandic, parietal and temporoinsular cortex, the subcortical white matter and left thalamus. Diffusion-weighted imaging showed high signal intensity and low apparent diffusion coefficient values in the frontoparietal lobes. To our knowledge, MRI findings in an adolescent with type I citrullinaemia have not been previously reported. Since our patient's neuroradiological findings showed greater similarity to type II citrullinaemia, we think his brain injury during this acute episode was probably age-related and independent of the type of citrullinaemia. (orig.)

Longo, Daniela; Delfino, Luciana; Fariello, Giuseppe [Bambino Gesu Children' s Hospital, Department of Paediatric Radiology, Rome (Italy); Genovese, Elisabetta; Cannata, Vittorio [Bambino Gesu Children' s Hospital, Department of Medical Direction/Medical Physics, Rome (Italy); Deodato, Federica; Dionisi-Vici, Carlo [Bambino Gesu Children' s Hospital, Division of Metabolism, Department of Neuroscience, Rome (Italy); Goffredo, Bianca [Bambino Gesu Children' s Hospital, Laboratory, Rome (Italy)

2008-02-15

153

MRI findings in acute idiopathic transverse myelopathy in children  

International Nuclear Information System (INIS)

To describe the clinical and MRI findings in three children with acute idiopathic myelopathy (AIM). Retrospective review of the clinical presentation, MRI findings and outcome of three patients diagnosed with acute idiopathic transverse myelitis. Of note was the swift onset of symptoms in all patients, without any preceding illness or history of vaccination in two of the patients, and the rapid resolution of symptoms on steroid therapy in all the patients. MRI showed T2-weighted hyperintensity and patchy enhancement with gadolinium, but the extensive cord involvement did not correlate with the severity of presentation or outcome. Our findings do not support that MRI evidence alone of diffuse myelopathy is a predictor of poor outcome in childhood AIM. (orig.)

154

Measurement of coronary flow response to cold pressor stress in asymptomatic women with cardiovascular risk factors using spiral velocity-encoded cine MRI at 3 Tesla  

Energy Technology Data Exchange (ETDEWEB)

Background: Coronary sinus (CS) flow in response to a provocative stress has been used as a surrogate measure of coronary flow reserve, and velocity-encoded cine (VEC) magnetic resonance imaging (MRI) is an established technique for measuring CS flow. In this study, the cold pressor test (CPT) was used to measure CS flow response because it elicits an endothelium-dependent coronary vasodilation that may afford greater sensitivity for detecting early changes in coronary endothelial function. Purpose: To investigate the feasibility and reproducibility of CS flow reactivity (CSFR) to CPT using spiral VEC MRI at 3 Tesla in a sample of asymptomatic women with cardiovascular risk factors. Material and Methods: Fourteen asymptomatic women (age 38 years +- 10) with cardiovascular risk factors were studied using 3D spiral VEC MRI of the CS at 3 T. The CPT was utilized as a provocative stress to measure changes in CS flow. CSFR to CPT was calculated from the ratio of CS flow during peak stress to baseline CS flow. Results: CPT induced a significant hemodynamic response as measured by a 45% increase in rate-pressure product (P<0.01). A significant increase in CS volume flow was also observed (baseline, 116 +- 26 ml/min; peak stress, 152 +- 34 ml/min, P=0.01). CSFR to CPT was 1.31 +- 0.20. Test-retest variability of CS volume flow was 5% at baseline and 6% during peak stress. Conclusion: Spiral CS VEC MRI at 3 T is a feasible and reproducible technique for measuring CS flow in asymptomatic women at risk for cardiovascular disease. Significant changes in CSFR to CPT are detectable, without demanding pharmacologic stress

Maroules, Christopher D.; Peshock, Ronald M. (Dept. of Radiology, Univ. of Texas Southwestern Medical Center, Dallas, TX (United States)), e-mail: Ron.Peshock@UTSouthwestern.edu; Chang, Alice Y.; Kontak, Andrew (Dept. of Internal Medicine, Univ. of Texas Southwestern Medical Center, Dallas, TX (United States)); Dimitrov, Ivan; Kotys, Melanie (Dept. of Philips Medical Systems, Cleveland, OH (United States))

2010-05-15

155

Pathological findings correlated with MRI in HIV infection  

International Nuclear Information System (INIS)

MRI forms an important part of the assessment of patients with HIV-related disease presenting with cerebral symptoms. Eleven formalin-fixed brains were studied at 0.5 T using T2- and T1-weighted sequences. In two cases of progressive multifocal leucoencephalopathy and one case each of toxoplasmosis and lymphoma, the extent of white matter abnormality seen on MRI corresponded broadly with that on pathological examination. In general, however, histological changes were more frequent than lesions on MRI. Cases in wich abnormalities were not seen with standard MRI included those with multiple tuberculous granulomata, multinucleate giant cells, microglial nodules, perivascular cuffing and cytomegalovirus inclusions. A common finding on MRI was punctate or patchy high signal in the basal ganglia on T2-weighted scans, seen in six cases. Corresponding histological changes included calcification of vessels with widened perivascular spaces, and mineralised neurones. (orig.)

156

Pathological findings correlated with MRI in HIV infection  

Energy Technology Data Exchange (ETDEWEB)

MRI forms an important part of the assessment of patients with HIV-related disease presenting with cerebral symptoms. Eleven formalin-fixed brains were studied at 0.5 T using T2- and T1-weighted sequences. In two cases of progressive multifocal leucoencephalopathy and one case each of toxoplasmosis and lymphoma, the extent of white matter abnormality seen on MRI corresponded broadly with that on pathological examination. In general, however, histological changes were more frequent than lesions on MRI. Cases in wich abnormalities were not seen with standard MRI included those with multiple tuberculous granulomata, multinucleate giant cells, microglial nodules, perivascular cuffing and cytomegalovirus inclusions. A common finding on MRI was punctate or patchy high signal in the basal ganglia on T2-weighted scans, seen in six cases. Corresponding histological changes included calcification of vessels with widened perivascular spaces, and mineralised neurones. (orig.)

Hawkins, C.P. (NMR Research Group, Inst. of Neurology, London (United Kingdom)); McLaughlin, J.E. (Dept. of Histopathology, Royal Free Medical School, London (United Kingdom)); Kendall, B.E. (NMR Research Group, Inst. of Neurology, London (United Kingdom)); McDonald, W.I. (NMR Research Group, Inst. of Neurology, London (United Kingdom))

1993-04-01

157

[Tuberculosis of the knee: MRI findings in two pediatric cases].  

Science.gov (United States)

Osteo-articular tuberculosis is rare in infants. The MRI findings reported for adolescents and young adults mainly relate to spinal involvement. Two cases of osteo-articular tuberculosis of infants located at the knee are presented. Vaccination has been correctly done. Skin test and chest radiography were normal. Evolution was insidious for one case. Osseous, medullary, cartilaginous and soft tissue abnormalities revealed by MRI were suspicious for tuberculosis. Diagnosis was confirmed at histology for both cases and bacteriology for one case. The aim of this study is to report the MRI features of osteo-articular tuberculosis in pediatric patients. PMID:13130240

Aloui, N; Nessib, N; Jalel, C; Ellouze, S; Essayed, M; Bellagha, I; Ben Chehida, F; Ghachem, M; Hammou, A

2003-01-01

158

Intracranial tuberculosis in AIDS: CT and MRI findings  

International Nuclear Information System (INIS)

CT and MRI findings in 35 patients with the acquired immune deficiency syndrome (AIDS) and proven intracranial tuberculosis (TB) are presented. Over 90% of the patients were intravenous drug abusers and in two-thirds TB was the first manifestation of AIDS. CT was normal in one quarter, the most frequent findings being hydrocephalus (51%) and meningeal enhancement (41%), commonly seen together (31.5%). Meningeal enhancement was seen in 48% of the CT studies with intravenous contrast medium and in 3 cases studied with MRI and iv gadolinium DPTA, in 2 of which CT was negative. Parenchymal involvement was found in 37% of cases; MRI was more sensitive than CT for its detection. One quarter of the patients had ischaemic lesions, mainly in the basal ganglia. We confirm the usefulness of CT and the superiority of MRI in the diagnosis of intracranial TB and in differential diagnosis from other conditions likely to be found in these patients. (orig.)

159

Incidental findings on brain MRI in the general population  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Background: Magnetic resonance imaging (MRI) of the brain is increasingly used both in research and in clinical medicine, and scanner hardware and MRI sequences are continually being improved. These advances are likely to result in the detection of unexpected, asymptomatic brain abnormalities, such as brain tumors, aneurysms, and subclinical vascular pathologic changes. We conducted a study to determine the prevalence of such incidental brain findings in the general population. Methods: The s...

Vernooij, M. W.; Ikram, M. A.; Tanghe, H. L. J.; Vincent, A. J. P. E.; Hofman, A.; Krestin, G. P.; Niessen, W. J.; Breteler, M. M. B.; Lugt, A.

2007-01-01

160

See-saw nystagmus and brainstem infarction: MRI findings  

Science.gov (United States)

A patient with see-saw nystagmus had a lesion localized by Magnetic Resonance Imaging (MRI) to the paramedian ventral midbrain with involvement of the right interstitial nucleus of Cajal. This the first MRI study of see-saw nystagmus associated with a presumed brainstem vascular event. Our findings support animal and human studies suggesting that dysfunction of the interstitial nucleus of Cajal or its connections is central in this disorder.

Kanter, D. S.; Ruff, R. L.; Leigh, R. J.; Modic, M.

1987-01-01

 
 
 
 
161

Cognitive dysfunction, MRI findings and manganese levels in alcoholics  

Energy Technology Data Exchange (ETDEWEB)

Alcoholic patients have been known to have brain atrophy and cognitive dysfunction. However, recent studies have reported bilateral signal hyperintensities of the globus pallidus on T1-weighted magnetic resonance imaging (MRI) in liver failure, findings that are typically associated with manganese intoxication. The present study compared brain atrophy on T1-weighted MRI, signal intensity ratios of the globus pallidus on T1-weighted MRI, whole blood manganese levels, and Wechsler Adult Intelligence Scale-Revised (WAIS-R) IQ parameters between alcoholics with and without liver cirrhosis, to investigate cognitive dysfunction, MRI findings and manganese levels in alcoholics. Pallidal hyperintensity was visually identified in 80% of alcoholic patients with liver cirrhosis. In addition, a significant correlation was seen between pallidal signal intensity (P.S.I.) ratio and blood manganese level. However, no significant correlations were found between pallidal signal intensity ratio and any of the WAIS-R parameters. These findings suggest that no direct connection exists between cognitive dysfunction and pallidal hyperintensity in alcoholic patients with liver cirrhosis. We confirmed that brain MRI in alcoholics could detect pallidal signal hyperintensity, suggesting severe liver dysfunction. In addition to diagnosis, brain MRI is useful for therapeutic psychoeducation to alcoholic patients with liver cirrhosis, visualizing the severe liver dysfunction. (author)

Itoh, Tsutomu; Nakane, Yoshibumi [Nagasaki Univ. (Japan). School of Medicine; Takahashi, Katsurou; Shimanaga, Masaki [National Nagasaki Medical Center, Omura (Japan)

2002-12-01

162

Biochemical and MRI findings of Kallmann's syndrome.  

Science.gov (United States)

Kallmann's syndrome is a neuronal migration disorder characterised by anosmia/hyposmia and hypogonadotropic hypogonadism. We present a case of a 21-year-old man who was unable to sense smell since birth and who displayed non-development of secondary sexual characteristics for the past 10?years. Blood investigations showed low basal levels of serum follicle stimulating hormone (FSH), serum luteinising hormone (LH) and serum testosterone. After a gonadotropin releasing hormone challenge test there was a slight increase in serum FSH and serum LH, and after a human chorionic gonadotropin (HCG) challenge test the patient's serum testosterone level increased to 34 times that of his basal level. MRI of the brain showed absence of bilateral olfactory bulbs and sulcus with an apparently normal appearing pituitary gland, and bilateral loss of distinction between the gyrus rectus and medial orbital gyrus, thus confirming the diagnosis. The patient is on treatment with injection of HCG 2000?IU deep intramuscular twice a week and is on follow-up. PMID:25498112

Dash, Prafulla Kumar; Raj, Dinesh Harvey

2014-01-01

163

Renal MRI findings and their clinical associations in nephropathia epidemica: analysis of quantitative findings  

Energy Technology Data Exchange (ETDEWEB)

Morphologic renal magnetic resonance imaging (MRI) findings in patients with nephropathia epidemica (NE) were evaluated, and these findings were correlated with the clinical course of NE. Renal MRI was performed in 20 hospitalized NE patients during the acute phase of their disease. A repeat MRI study was made 5-8 months later. Renal parenchymal volume, renal length and parenchymal thickness were decreased in all patients in the repeat study. Edema/fluid collections were found bilaterally in 16 patients in the primary MRI study. Greater change in parenchymal volume, renal length and parenchymal thickness between the primary and the repeat MRI study as well as the presence of edema/fluid collections in the primary study evinced mild association with clinical fluid volume overload, high blood pressure level, inflammation, thrombocytopenia and severe clinical renal insufficiency. Change in parenchymal volume was associated with a severe clinical course more markedly than the other MRI findings. Measurable renal MRI changes occurred in every NE patient. The severity of the findings in MRI evinced mild association with clinical fluid volume overload, high blood pressure level, inflammation, thrombocytopenia and severe clinical renal insufficiency. Based on this study and our previous ultrasound (US) findings, we prefer US as the primary examination mode in NE patients. (orig.)

Paakkala, A. [University of Tampere, Medical School, Tampere (Finland); Tampere University Hospital, Department of Radiology, Tampere (Finland); Dastidar, P.; Ryymin, P. [Tampere University Hospital, Department of Radiology, Tampere (Finland); Huhtala, H. [University of Tampere, School of Public Health, Tampere (Finland); Mustonen, J. [University of Tampere, Medical School, Tampere (Finland); Tampere University Hospital, Department of Medicine, Tampere (Finland)

2005-05-01

164

Inflammatory pseudotumors of the spleen: CT and MRI findings  

Energy Technology Data Exchange (ETDEWEB)

Our goal was to etucidate the CT and MRI findings of inflammatory pseudotumors of the spleen. The CT and MRI findings of three patients with inflammatory pseudotumors of the spleen were reviewed and compared with the pathologic findings. On the early phase of CT, the masses were hypodense to the normal spleen, and on the delayed phase, they demonstrated delayed enhancement. On T1-weighted MR images, the masses were isointense to the normal spleen, and on T2-weighted images, the masses had heterogeneous low signal intensities. After administration of Gd-DTPA, the masses showed delayed enhancement. Inflammatory pseudotumors of the spleen were characterized by low signal intensity on T2-weighted MR images and delayed enhancement after contrast material administration on CT and MRI. The fibrous stroma may contribute to these unusual findings. 23 refs., 3 figs.

Irie, Hiroyuki; Honda, Hiroshi; Kaneko, Kuniyuki; Kuroiwa, Toshiro [Kyushu Univ., Fukuoka (Japan)] [and others

1996-03-01

165

Membranous lipodystrophy: skeletal findings on CT and MRI  

Energy Technology Data Exchange (ETDEWEB)

Membranous lipodystrophy, also known as Nasu-Hakola disease, is a rare hereditary condition with manifestations in the nervous and skeletal systems. The radiographic appearance of skeletal lesions has been well described in the literature. However, CT and MRI findings of lesions in the bone have not been documented to date. This report describes the radiographic, CT, MRI, and histopathologic skeletal findings in a case of membranous lipodystrophy. With corroborative pathologic findings, a diagnosis of membranous lipodystrophy on imaging allows for appropriate clinical management of disease manifestations. (orig.)

Nwawka, O.K.; Schneider, Robert; Mintz, Douglas N. [Hospital for Special Surgery, Department of Radiology and Imaging, New York, NY (United States); Bansal, Manjula [Hospital for Special Surgery, Department of Pathology and Laboratory Medicine, New York, NY (United States); Lane, Joseph [Hospital for Special Surgery, Department of Orthopedic Surgery, New York, NY (United States)

2014-10-15

166

Membranous lipodystrophy: skeletal findings on CT and MRI  

International Nuclear Information System (INIS)

Membranous lipodystrophy, also known as Nasu-Hakola disease, is a rare hereditary condition with manifestations in the nervous and skeletal systems. The radiographic appearance of skeletal lesions has been well described in the literature. However, CT and MRI findings of lesions in the bone have not been documented to date. This report describes the radiographic, CT, MRI, and histopathologic skeletal findings in a case of membranous lipodystrophy. With corroborative pathologic findings, a diagnosis of membranous lipodystrophy on imaging allows for appropriate clinical management of disease manifestations. (orig.)

167

MRI findings and hematoma contents of chronic subdural hematomas  

International Nuclear Information System (INIS)

Twenty-six cases of chronic subdural hematomas (CSDHs) were studied with special reference to the magnetic resonance image (MRI) findings and the biochemical analysis of the hematoma contents. There were 5 cases of bilateral CSDH. An apparent history of head trauma was obtained in 13 cases. All cases were evaluated preoperatively with both computed tomography (CT) and MRI. MRI was studied with both T1-weighted (spin echo, TR/TE 600/15) imaging (T1WI) and T2-weighted (spin echo, TR/TE 3,000/90) imaging (T2WI). A biochemical analysis of the hematoma contents was assayed with regard to hematocrit (HT), the total protein (TP), methemoglobin (Met-Hb), the total cholesterol (Tchol), triglyceride (TG), fibrin and fibrinogen degradation products (FDP), Fe, and osmolarity (Osm). The CT findings were divided into four groups: 5 cases of low-density, 7 cases of isodensity, 13 cases of high-density, and 5 cases of mixed-density hematomas. The MRI findings were also divided as 18 cases of high-, 4 cases of iso-, and 2 cases of low-signal-intensity hematomas on T1WI. On T2WI, 18 cases were high-, 4 cases were iso-, and 2 cases were low-signal-intensity hematomas. Twelve cases were high-signal-intensity hematomas on both T1WI and T2WI. In comparison with the CT and MRI findings, hematomas of low and isodensity on CT showed high signal intensities on T1WI except in one case. The high-de>1WI except in one case. The high-density hematomas on CT showed a variable signal intensity on MRI. The results of the biochemical analysis of hematoma fluid were compared with the MRI findings. The Ht value showed no apparent correlation with the MRI findings; however, increased values of TP in hematomas tended to show higher signal intensities on T1WI. The most apparent correlation was seen between the Met-Hb ratio and T1WI MRI. All hematomas containing >10% Met-Hb showed high signal intensities on T1WI. The CT, the MRI, and the results of the biochemic analysis of hematoma contents were presented in 3 cases. (J.P.N.)

168

CT, MRI, and PET findings of gastric schwannoma.  

Science.gov (United States)

Gastric schwannoma is a rare tumor that accounts for only 0.2 % of all gastric tumors. We report a case of gastric schwannoma that underwent computed tomography (CT), magnetic resonance imaging (MRI), and [(18)F]-fluorodeoxyglucose positron emission tomography (FDG-PET), and its histological confirmation was acquired. Gastric schwannoma showed high intensity on T2-weighted and diffusion-weighted MRI and high maximum standardized uptake on [(18)F]-FDG-PET. Lymphadenopathy close to the tumor was also found. Although diffusion-weighted MRI, [(18)F]-FDG-PET, and the presence of lymphadenopathy could suggest malignant tumors, the detail interpretation of the other CT and MRI findings may give a clue for the diagnosis of gastric schwannoma. PMID:22660866

Takeda, Minako; Amano, Yasuo; Machida, Tadashi; Kato, Shunji; Naito, Zenya; Kumita, Shinichiro

2012-08-01

169

MRI and surgical findings in deltoid ligament tears.  

Science.gov (United States)

OBJECTIVE. The objectives of our study were to determine the accuracy of new MRI criteria in detecting tears of the superficial deltoid ligament of the ankle, the accuracy of established criteria for detecting deep deltoid ligament tears, the most common location of super-ficial deltoid ligament tears, and the frequency of other injuries associated with deltoid tears. MATERIALS AND METHODS. A chart review yielded 89 cases over a 3-year interval in which ankle MRI was followed by open or arthroscopic surgery and the surgical report described findings in the deltoid ligament. One case was excluded because the MRI study was technically inadequate. MRI and surgical reports were then compared for the presence and location of deltoid ligament tears. RESULTS. MRI findings of focal detachment of the superficial deltoid origin or detachment of the fascial sleeve of the medial malleolus yielded a sensitivity for superficial deltoid ligament tears of 83.3% (45/54) and specificity of 93.9% (31/33). Eight of nine prospectively missed tears were visible on retrospective review. All superficial deltoid tears involved the origin of the ligament from the medial malleolus, and six involved mid or distal bundles of the superficial deltoid as well. MRI findings of discontinuity or nonvisualization of discrete fibers yielded a sensitivity for deep deltoid ligament tears of 96.3% (26/27) and specificity of 97.9% (46/47). CONCLUSION. MRI has a high accuracy for deltoid ligament tears in consecutive cases prospectively evaluated by musculoskeletal radiologists. The location of superficial deltoid ligament tears differed in our series from findings previously reported in the imaging literature. PMID:25539277

Crim, Julia; Longenecker, Loren G

2015-01-01

170

Measurement of ventricular volumes by cine magnetic resonance imaging in complex congenital heart disease  

International Nuclear Information System (INIS)

Along with the remarkable improvement in surgical results for complex congenital heart disease (CCHD) in recent years, it has become increasingly important for pediatric cardiologist and cardiovascular surgeons to evaluate ventricular volumes in CCHD accurately to develop a proper strategy for treating these patients. However, the validity of geometric formulas to derive volumes in various morphological types of abnormal ventricles like those in CCHD has been problematic. This study assessed the validity and usefulness of cine magnetic resonance imaging (MRI) for measuring right and left ventricular volumes using Simpson's rule in children with CCHD. Twenty-eight patients with CCHD (group A), children ranging in age from 4 months to 8 years (average 2.4 years) and 10 patients with morphologically normal ventricles (control; group B), ranging in age from 1 to 6 years (average 2.7 years) were evaluated. Cine MRI was performed by the GRASS methods (gradient recalled acquisition in steady state) at 0.5 T. The whole heart was encompassed by contiguous 7 or 10 mm transverse section. Ventricular volumes were calculated by adding luminal areas determined in each section at end-diastole and end-systole (EDV and ESV). Cine MRI findings of the right and left ventricular volumes were compared with those on ventriculogram. All cine MRI studies were considered diagnostic. Comparison of the RVEDV, RVESV, LVEDV and LVESV in both groups yielded a good correlation between cine MRI (Y) d a good correlation between cine MRI (Y) and ventriculography (X): RVEDV; Y=0.98X-0.49, r=0.98, RVESV; Y=0.89X+2.2, r=0.95, LVEDV; Y=0.97X+0.59, r=0.97, LVESV; Y=0.91X+0.56, r=0.95, Group B: RVEDV; Y=0.87X+4.9, r=0.93, RVESV; Y=0.91X+1.7, r=0.90, LVEDV; Y=1.1X-3.0, r=0.97, LVESV; Y=0.91X+0.6, r=0.93. These findigns indicate that cine MRI provides a suitable non-invasive means of quantifying right ventricular volume and left ventricular volumes in children with CCHD. (author)

171

Hepatic toxocariasis: US, CT and MRI findings.  

Science.gov (United States)

Visceral larva migrans (VLM) most commonly occurs as a febrile disease of childhood particularly affecting children between 1 and 7 years of age. Pulmonary, dermatological, hepatic, lymphatic, cardiac, rheumatological and neurological manifestations may occur. VLM seems to be a rare disease in adults. We report the imaging findings of a woman with hepatic toxocariasis. Ultrasonography showed a solitary hepatic lesion measuring 4 x 3 cm, displaying a hypoechoic-heterogeneous pattern with ill-defined borders and distal acoustic enhancement, located in the right sub-diaphragmatic area. Two enlarged periportal lymph nodes and moderately dilated intrahepatic biliary ducts were also noted. The probability of toxocariasis was discussed, based on sonographic and biopsy findings, and the final diagnosis was confirmed by a specific ELISA test. In summary, a clinical picture of cholestasis initially resembling hepatitis or malignancy should be further evaluated by imaging techniques, and the ultrasound examiner should be familiar with the possible findings of hepatic toxocariasis, which consist of focal ill-defined hepatic lesions, hepato-splenomegaly, biliary dilatation, sludge and periportal lymph node enlargement. PMID:16123929

Kabaalio?lu, A; Ceken, K; Alimo?lu, E; Saba, R; Apaydin, A

2005-08-01

172

Reliability of MRI findings in candidates for lumbar disc prosthesis  

Energy Technology Data Exchange (ETDEWEB)

Limited reliability data exist for localised magnetic resonance imaging (MRI) findings relevant to planning of treatment with lumbar disc prosthesis and later outcomes. We assessed the reliability of such findings in chronic low back pain patients who were accepted candidates for disc prosthesis. On pretreatment MRI of 170 patients (mean age 41 years; 88 women), three experienced radiologists independently rated Modic changes, disc findings and facet arthropathy at L3/L4, L4/L5 and L5/S1. Two radiologists rerated 126 examinations. For each MRI finding at each disc level, agreement was analysed using the kappa statistic and differences in prevalence across observers using a fixed effects model. All findings at L3/L4 and facet arthropathy at L5/S1 had a mean prevalence <10% across observers and were not further analysed, ensuring interpretable kappa values. Overall interobserver agreement was generally moderate or good (kappa 0.40-0.77) at L4-S1 for Modic changes, nucleus pulposus signal, disc height (subjective and measured), posterior high-intensity zone (HIZ) and disc contour, and fair (kappa 0.24) at L4/L5 for facet arthropathy. Posterior HIZ at L5/S1 and severely reduced subjective disc height at L4/L5 differed up to threefold in prevalence between observers (p < 0.0001). Intraobserver agreement was mostly good or very good (kappa 0.60-1.00). In candidates for disc prosthesis, mostly moderate interobserver agreement is expected for localised MRI findings. (orig.)

Berg, Linda; Espeland, Ansgar [Haukeland University Hospital, Department of Radiology, Bergen (Norway); University of Bergen, Section for Radiology, Department of Surgical Sciences, Bergen (Norway); Neckelmann, Gesche [Haukeland University Hospital, Department of Radiology, Bergen (Norway); Gjertsen, Oeivind [Oslo University Hospital, Department of Neuroradiology, Oslo (Norway); Hellum, Christian [Oslo University Hospital, Department of Orthopaedics, Oslo (Norway); University of Oslo, Department of Orthopaedics, Oslo (Norway); Johnsen, Lars G. [University Hospital of Trondheim, National Centre for Diseases of the Spine, Trondheim (Norway); University Hospital of Trondheim, Orthopaedic Department, Trondheim (Norway); Eide, Geir E. [Haukeland University Hospital, Centre for Clinical Research, Bergen (Norway); University of Bergen, Department of Public Health and Primary Health Care, Bergen (Norway)

2012-07-15

173

MRI findings associated with luxatio erecta humeri  

Energy Technology Data Exchange (ETDEWEB)

Luxatio erecta humeri is a rare type of inferior glenohumeral dislocation with a unique radiographic appearance; however, the magnetic resonance imaging findings associated with this dislocation have not been described in the radiology literature. The purpose of this study is to identify magnetic resonance imaging findings associated with this uncommon type of glenohumeral dislocation. The magnetic resonance imaging features of four patients with clinical and radiographic evidence of luxatio erecta humeri were reviewed retrospectively by two musculoskeletal-trained radiologists. The reported mechanism of injury in all four patients was falling. The MR imaging examinations were evaluated for the presence of rotator cuff and biceps tendon pathology, glenoid labrum pathology, joint capsule and glenohumeral ligament injury, fractures and bone marrow contusions, articular cartilage injury, and joint effusions. All four patients demonstrated pathology of the glenohumeral joint. Three of the four patients demonstrated rotator cuff tears, including large full thickness tears of the supraspinatus and infraspinatus tendons in two patients, and small full thickness tear of the supraspinatus tendon with partial thickness tear of the infraspinatus tendon in the third patient. In the two patients with large full thickness tears of the supraspinatus and infraspinatus tendons, one patient demonstrated tearing of the subscapularis tendon with dislocation of a partially torn long head of the biceps tendon, and the second patient demonstrated full thickness tearing of the intra-articular biceps tendon. All four patients demonstrated injuries to the glenoid labrum and both anterior and posterior bands of the inferior glenohumeral ligament. Contusions or fractures of the humeral head were seen in two of the patients. Three of the four patients demonstrated cartilage abnormalities including a focal cartilage defect in the anterior inferior glenoid in one patient, and cartilage surface irregularity of the glenoid in the other two patients. Common magnetic resonance imaging findings in patients with a prior luxatio erecta humeri dislocation include rotator cuff tears, injury to the glenoid labrum, and injury to both the anterior and posterior bands of the inferior glenohumeral ligament. These findings are compatible with the mechanism of dislocation in luxatio erecta, and noting these findings on magnetic resonance imaging may suggest that the patient has sustained a prior inferiorly directed glenohumeral dislocation such as luxatio erecta. (orig.)

Krug, David K.; Vinson, Emily N.; Helms, Clyde A. [Duke University Medical Center, Department of Radiology, Box 3808, Durham, NC (United States)

2010-01-15

174

MRI findings of children cerebral paragonimiasis in early active stage  

International Nuclear Information System (INIS)

Objective: MRI findings of cerebral paragonimiasis in early stage is important to improve the diagnosis and therapy of this disease. Accordingly, this study was undertaken to evaluate the MRI features of early cerebral paragonimiasis. Methods: MRI features in 4 cases between 6 and 13 years old with cerebral paragonimiasis in the early stage were retrospectively reviewed. The diagnosis was based on a positive antibody test by enzyme-linked immunosorbent assay (ELISA) for paragonimiasis in serum and effective therapy. Conventional MRI was performed by using spin echo (SE) pulse sequences in 4 cases and MRA was performed in one case. Results: The common findings were multiple irregular hemorrhage, part of them surrounded with edema signals which often showed large unsuitable edematous area centered with small hemorrhagic lesion. Lesions of two cases were just localized in cerebral lobes and the other two cases could be found in cerebrum, cerebellum and brain stem which showed the lesions distributed in random ways, Most lesions showed the shapes of assembling and migrating. The characteristic appearance was 'tunnel sign' which showed the migrating track of adult worm. 'Tunnel sign' on T1WI showed tunnel-like high signal in early stage and low signal in later stage. Conclusion: MRI findings of multiple irregular hemorrhage, unsuitable surrounding edema, assembling and migrating lesions and 'tunnel sign' are suggestive of early active cerebral paragonimiasisf early active cerebral paragonimiasis

175

Cortical dysplasia : MRI findings according to the pathological grading  

Energy Technology Data Exchange (ETDEWEB)

The purpose of this study is to describe the MRI findings of cortical dysplasia (CD) according to pathological grading. MRI findings in 24 patients with pathologically proven CD were retrospectively reviewed and were described according to their histologic grading. The group consisted of 11 men and 13 women, and their median age was 21.4 (range, 5 to 41) years. Histologic findings were assigned one of three grades : Grade I (dyslamination of cortical layers only) ; Grade II (additional dysplastic neurons); or Grade III (additional balloon cells). T1 and T2W spin-echo MR images were obtained and were evaluated with specific reference to detection rate, location of the anomaly, the presence or absence of prolonged T2 relaxation in the underlying white matter, and configuration of the dysplastic cortex. Nine patients were found to be suffering from grade I CD, seven from grade II, and eight from grade III. MRI findings were abnormal in 58% of cases (14/24); three of these were grade I, four were grade II, and seven were grade III. Among these 14 patients, four had the lesion in the frontal lobe; five, in the temporal lobe; one, in the parietal lobe; two, in the sylvian fissure area, and two with tuberous sclerosis and multiple lesions. Of twelve patients with cortical dysplasia other than tuberous sclerosis, as seen on MRI, six showed poor gray-white matter differentiation, and six showed cortical thickening; this ranged from 7-10 mm in thickness with irregular, bumpy cortical surfaces. Areas of prolonged T2 relaxation in the underlying white matter were present in six patients. MRI findings were abnormal in 58 % of CD patients. The higher the pathological grading, the higher the detection rate of CD on MRI. To increase the detectability of slight cortical dysplasia, technical development, including new MR sequences or imaging methods, is needed (author). 21 refs., 5 figs.

Chung, Gyung Ho; Sohn, Myung Hee; Kim, Chong Soo; Kim, Hyoung Ihl; Lee, Min Chul [Chonbuk National University, Chonju (Korea, Republic of)

1998-05-01

176

MRI and CT findings of neurohypophyseal germinoma  

International Nuclear Information System (INIS)

Objective: Magnetic resonance (MR) imaging and computed tomography (CT) findings of neurohypophyseal germinoma have not previously been described in detail. The purpose of the present study was to establish the spectrum of MR imaging and CT findings in neurohypophyseal germinomas. Materials and methods: MR and CT images of 13 consecutive patients (seven males, six females; mean age: 15 years; range: 6-31 years) with neurohypophyseal germinoma were retrospectively analyzed. The diagnosis had been made either histologically (n=8) or clinically according to established criteria (n=5). All patients had been examined using MR imaging and CT before treatment. Results: On MR imaging, infundibular thickening (up to 16 mm) was observed in all 13 cases. Hyperintensity of the posterior pituitary on T1-weighted image was absent in all 13 cases (100%) and 12 of the 13 displayed central diabetes insipidus. Ten germinomas (77%) were isointense to cerebral cortex on T1-weighted image, but variable intensities were exhibited on T2-weighted image. MR images revealed intratumoral cysts in six cases (46%), most of which demonstrated intra-third ventricular extension. Eleven of the 13 cases (85%) revealed hyperdense solid components on unenhanced CT. Calcification was absent in all cases (100%). Conclusion: Infundibular thickening, absence of the posterior pituitary high signal on T1-weighted image, lack of calcification and hyperdensity on unenhanced CT are common imaging features of neunced CT are common imaging features of neurohypophyseal germinoma

177

CT and MRI findings in HAM  

International Nuclear Information System (INIS)

The findings of the spinal MR imagings and the CT myelography of 5 cases with HTLV-I associated myelopathy (HAM) were presented. One case who showed transverse myelopathy with a multiple sclerosis-like abrupt onset showed spinal-cord swelling at the early stage on CT myelography; its disappearance was documented 4 months after corticosteroid therapy. The other 4 cases, all with slowly progressive myelopathy, clinically revealed spinal-cord atrophy, especially at the thoracic level, on MR imagings. The degree of spinal-cord atrophy seemed not have any correlation with the clinical and laboratory data or with the corticosteroid therapy. The clinical entity of HAM has not yet been determined, and its relationship with tropical spastic paraparesis (TSP) as well as that with some form of multiple sclerosis is controversial. The neuroradiological findings of MR imaging and CT myelography, including spinal-cord swelling at the early stage, in a case diagnosed as HAM with atypical clinical features or as spinal-cord atrophy in typical chronic cases might contribute to its resolution. (author)

178

A study of brain MRI findings in children with epilepsy  

International Nuclear Information System (INIS)

Magnetic resonance imaging in the brain was performed in 293 patients with childhood-onset (<15 y.o.) epilepsy who had been classified into 4 groups, idiopathic localization-related epilepsy (ILRE), 78 patients; idiopathic generalized epilepsy (IGE), 116 patients; symptomatic localization-related epilepsy (SLRE), 68 patients and symptomatic generalized epilepsy (SGE), 31 patients, with the Classification of Epilepsies and Epileptic Syndrome (1989 International League Against Epilepsy). The examination was performed with a 1.5 T magnet. One hundred twenty-five patients (42.7%) showed abnormal findings, and the incidence in each group was as follows: Idiopathic epilepsy: The rate of abnormal findings in the ILRE and IGE groups was 21.8% and 20.7%, respectively. Most of the abnormal findings were secondary changes, such as diffuse or localized brain atrophy. Of the congenital abnormalities, the main finding was arachnoid cyst. Symptomatic epilepsy: The rate of abnormality in the SLRE patients was 88.2%, and 85% of the findings were secondary changes, i.e., brain atrophy, or degeneration of the white matter. In the SGE group, the rate was 77.4%, with an almost equal percentage of congenital and secondary changes. Of 255 patients who were examined by electroencephalography (EEG) on the same day as MRI, about 50% showed a correlation between the EEG records and the MRI abnormalities. However, only 8 patients showed a correlation in localization between the EEG and MRI abnorlocalization between the EEG and MRI abnormalities. (author)

179

Investigation of MRI findings of Tolosa-Hunt syndrome  

International Nuclear Information System (INIS)

Objective: To investigate Mill findings of Tolosa-Hunt syndrome and evaluate the role of MRI in diagnosis and differential diagnosis. Methods: Seventeen cases of Tolosa-Hunt syndrome, confirmed by clinical follow-up, were studied. MRI scanning of the brain and thin-slice MilI scanning of the cavernous sinus combined with contrast scanning were performed and compared with each other in all cases. Results: Enlarged cavernous sinus was found in thin-slice MRI combined with contrast scanning in all 17 cases, which showed isointense or mildly hypointense on both T1-weighted and T2-weighted images and markedly homogeneous enhancement on postcontrast T1-weighted imaging. Thin-slice MRI also showed the abnormalities of the superior orbital fissure in three cases, of the orbital apex in one case, and of both the superior orbital fissure and the orbital apex in three cases. Cavernous sinus segment of the internal carotid artery, encircled by the lesion was seen in six patients and localized narrowing of it was observed in four eases. However, abnormal appearances of the cavernous sinus were demonstrated in only eleven patients on MRI scanning of the brain. Therefore, thin-slice Mill combined with contrast scanning was superior to Mill scanning of the brain in evaluation of Tolosa-Hunt syndrome (?2=4.17, P<0.05). Conclusion: Compared with MRI scanning of the brain, thin-slice MRI scanning of the cavernous sinus combined with contrast e cavernous sinus combined with contrast scanning could better reveal the characteristic findings of Tolosa-Hunt syndrome, contributing to diagnosis and differential diagnosis as well as follow-up. (authors)

180

Accuracy of MRI findings in chronic lateral ankle ligament injury: Comparison with surgical findings  

Energy Technology Data Exchange (ETDEWEB)

Aim: To evaluate the accuracy of magnetic resonance imaging (MRI) findings in chronic lateral ankle ligament injury in comparison with that of surgical findings. Materials and methods: Forty-eight cases (25 men, 23 women, mean age 36 years) of clinically suspected chronic ankle ligament injury underwent MRI studies and surgery. Sagittal, coronal, and axial, T1-weighted, spin-echo, proton density and T2-weighted, fast spin-echo images with fat saturation were obtained in all patients. MRI examinations were read in consensus by two fellowship-trained academic musculoskeletal radiologists who evaluated the lateral ankle ligaments, including the anterior talofibular ligament (ATFL) and calcaneofibular ligament (CFL) without clinical information. The results of the MRI studies were then compared with the surgical findings. Results: The MRI findings of ATFL injury showed a sensitivity of detection of complete tears of 75% and specificity of 86%. The sensitivity of detection of partial tears was 75% and the specificity was 78%. The sensitivity of detection of sprains was 44% and the specificity was 88%. Regarding the MRI findings of CFL injury, the sensitivity of detection of complete tears was 50% and the specificity was 98%. The sensitivity of detection of partial tear was 83% and the specificity was 93%. The sensitivity of detection of sprains was 100% and the specificity was 90%. Regarding the ATFL, the accuracies of detection were 88, 58, 77, and 85% for no injury, sprain, partial tear, and complete tear, respectively, and for the CFL the accuracies of detection were 90, 90, 92, and 96% for no injury, sprain, partial tear, and complete tear, respectively. Conclusions: The diagnosis of a complete tear of the ATFL on MRI is more sensitive than the diagnosis of a complete tear of the CFL. MRI findings of CFL injury are diagnostically specific but are not sensitive. However, only normal findings and complete tears were statistically significant between ATFL and CFL (p < 0.001).

Park, H.-J. [Department of Radiology, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul (Korea, Republic of); Department of Radiology, Kangwon National University, School of Medicine, Chuncheon (Korea, Republic of); Cha, S.-D. [Department of Orthopedic Surgery, Myongji Hospital, Kwandong University, College of Medicine, Koyang (Korea, Republic of); Kim, S.S. [Department of Radiology, Kangwon National University, School of Medicine, Chuncheon (Korea, Republic of); Rho, M.-H., E-mail: parkhiji@kangwon.ac.kr [Department of Radiology, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul (Korea, Republic of); Kwag, H.-J. [Department of Radiology, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul (Korea, Republic of); Park, N.-H. [Department of Radiology, Myongji Hospital, Kwandong University, College of Medicine, Koyang (Korea, Republic of); Lee, S.-Y. [Department of Radiology, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul (Korea, Republic of)

2012-04-15

 
 
 
 
181

Purulent meningitis with unusual diffusion-weighted MRI findings  

International Nuclear Information System (INIS)

We describe unusual findings obtained by diffusion-weighted magnetic resonance imaging (MRI) in a patient with acute purulent meningitis caused by penicillin-resistant Streptococcus pneumoniae. Along cerebral convexities and the Sylvian fissure, multiple small intense lesions showed high signal intensity in these sequences. This may be the first report of diffusion-weighted in purulent meningitis

182

MRI Findings of Brucellar Spondylitis: A Case Report  

Energy Technology Data Exchange (ETDEWEB)

Brucellosis is a systemic infectious disease, and musculoskeletal involvement is a frequent complication. Particularly, spondylitis is a common involvement. However, early diagnosis of brucellar spondylitis is often difficult due to non-specific clinical symptoms and long latent period. Especially in Korea, where tuberculosis is an endemic disease, differentiation between tuberculous and brucellar spondylitis is clinically and radiologically more challenging. A 59-year-old male cattle farmer, who presented with non-specific back pain, had spondylitis on magnetic resonance imaging (MRI), and serologic test finally confirmed brucellar spondylitis. Therefore, we report a case of a rather rare disease in Korea, brucellar spondylitis with a review of MRI findings.

Kim, Jin Woo; Kim, Myung Soon; Kim, Young Ju [Dept. of Radiology, Wonju Christian Hospital, Yonsei University Wonju College of Medicine, Wonju (Korea, Republic of)

2013-03-15

183

MRI Findings of Brucellar Spondylitis: A Case Report  

International Nuclear Information System (INIS)

Brucellosis is a systemic infectious disease, and musculoskeletal involvement is a frequent complication. Particularly, spondylitis is a common involvement. However, early diagnosis of brucellar spondylitis is often difficult due to non-specific clinical symptoms and long latent period. Especially in Korea, where tuberculosis is an endemic disease, differentiation between tuberculous and brucellar spondylitis is clinically and radiologically more challenging. A 59-year-old male cattle farmer, who presented with non-specific back pain, had spondylitis on magnetic resonance imaging (MRI), and serologic test finally confirmed brucellar spondylitis. Therefore, we report a case of a rather rare disease in Korea, brucellar spondylitis with a review of MRI findings.

184

Rhombencephalosynapsis diagnosed in childhood: clinical and MRI findings.  

Science.gov (United States)

Rhombencephalosynapsis (RES) is a rare cerebellar malformation of unknown etiology characterized by vermal agenesis or hypogenesis, fusion of hemispheres and the dentate nuclei. Clinical presentation and prognosis are extremely variable and generally depends one the associated supratentorial anomalies. We report the first Tunisian case of RES diagnosed by magnetic resonance imaging (MRI) in a 3.5-year-old boy born to consanguineous parents. The child had spastic diplegia, facial dysmorphia, skeletal anomalies and normal intellectual development. Additional supratentorial anomalies were agenesis of septum pellucidum, moderate hydrocephalus and hypogenesis of corpus callosum. In this paper, the clinical and MRI findings and possible pathogenesis of this disorder are discussed. PMID:17097321

Chemli, Jalel; Abroug, Mejdi; Tlili, Kalthoum; Harbi, Abdelaziz

2007-01-01

185

Necrotizing fasciitis: unreliable MRI findings in the preoperative diagnosis  

International Nuclear Information System (INIS)

The authors present two cases of necrotizing fasciitis (NF), one case of dermatomyositis and one case of posttraumatic muscle injury, which have similar magnetic resonance imaging findings in terms of skin, subcutaneous fat, superficial and deep fasciae and muscle involvement. These cases highlight the need for cautious interpretation of magnetic resonance imaging (MRI) findings, for they are nonspecific and the preoperative decision should be based mostly on the evolution of the clinical status

186

Spongiform leucoencephalopathy after inhaling heroin vapor: CT and MRI findings  

International Nuclear Information System (INIS)

Objective: To explore CT and MRI features of spongiform leucoencephalopathy after inhaling 'heroin' pyrolysate, and to improve the diagnostic ability of the disease. Methods: Four patients, which inhaled heroin vapor, received the CT or MRI pre- and post-contrast scanning. MR sequences included conventional SE T1WI, T2WI, fluid attenuation inverse recover (FLAIR), and MRS. Results: All 4 cases had similar symmetrical lesions involving the cerebellum, lateral brainstem, cerebral peduncles, posterior limbs of internal capsule, splenium of corpus callosum, medial lemniscuses, and posterior cerebral white mattes without enhancement. The lesions showed hypodense on CT and hypointense on T1WI, hyperintense on T2WI and FLAIR. Cerebellar lesions were more serious than cerebral one, and the parieto-occipital lesions were serious than frontal one. MRS showed that the abnormalities in the white matter were degenerative changes, not necrosis. Conclusion: CT and MRI findings of this diseases are characteristic. Combined with the history, the disease can be diagnosed

187

Clinical features and MRI findings of blow-out fracture  

International Nuclear Information System (INIS)

Precise anatomical understanding of orbital blow-out fracture lesions is necessary for the treatment of patients. Retrospectively, MRI findings were compared with the clinical features of pure type blow-out fractures and the efficacy of MRI in influencing a decision for surgical intervention was evaluated. Eighteen child (15 boys, 3 girls) cases were evaluated and compared with adult cases. The patients were classified into three categories (Fig.1) and two types (Fig.2) in accordance with the degree of protrusion of fat tissue. The degree of muscle protrusion also was divided into three categories (Fig. 3). Both muscle and fat tissue were protruding from the fracture site in 14 cases. Fat tissue protrusion alone was found in 3 cases. In contrast, no protrusion was seen in one case. The incarcerated type of fat prolapse was found in 40% of cases, while muscle tissue prolapse was found in 75% of patients. Marginal irregularity or swelling of muscle was observed in 11 patients. There was good correlation of ocular motor disturbance and MRI findings. Disturbance of eyeball movement was observed in all patients with either incarcerated fat tissue or marginal irregularity or swelling of muscle. In contrast, restriction of eyeball movement was rare in cases of no incarceration, even if the fracture was wide. Deformity or marginal irregularity of the ocular muscle demonstrated in MRI may suggest damage an adhesion to the muscle wall. When MRI reveals incarceration or severe pWhen MRI reveals incarceration or severe prolapse of fat tissue, or deformity and marginal irregularity of the ocular muscle, surgical intervention should be considered. (author)

188

MRI findings and correlative study of MRI and visual evoked potentials in optic neuritis  

International Nuclear Information System (INIS)

Objective: To investigate the effective MRI sequences and describe the correlation between MRI and visual evoked potential (VEP) in diagnosing optic neuritis. Methods: One hundred and fifty-four eyes with visual impairment of 98 patients with diagnoses of optic neuritis, papillitis, multiple sclerosis and Devic's disease underwent MRI and VEP examination. The MRI findings were analyzed and correlated with VEP results and clinical presentation by using X2 test, wilco xon test and Kappa test. Results Out of the 154 sick eyes, 56 eyes presented thickened optic nerves, 76 eyes had normal diameter of the optic nerve, and 22 eyes had thin optic nerves. A total of 132 optic nerves showed abnormally high signal in STIR sequences, including involvement of intraocular segment in 7, intraorbital segment in 1.35, intracanalicular segment in 109, intracranial segment in 97, optic chiasm in 56, and optic tract in 23. A total of 54 patients underwent postcontrast MRI. Seventy-four optic nerves of 87 eyes showed enhancement. Among the 196 eyes of 98 patients, 132 eyes presented visual impairment and simultaneous abnormal MR signal of the optic nerve, and 26 eyes had both normal vision and normal MR signal of optic nerve. The consistency of MRI findings and vision status was 80. 61% (Kappa 0.453,P1-weighted MR sequence combined with fat- suppression are helpful in diagnosis of optic neuritis. VEP is helpful in diagnosing optic neuritis and in finding subclinical visual problem. The MRI combined with VEP could improve the diagnostic accuracy of optic neuritis. (authors)

189

MRI findings of Wernicke encephalopathy revisited due to hunger strike  

Energy Technology Data Exchange (ETDEWEB)

Background and Purpose: The purpose of this study was to determine the characteristic magnetic resonance imaging (MRI) findings among a group of patients who presented with Wernicke encephalopathy (WE) due to the neurological complications of a long-term hunger strike (HS). Methods: MRI studies also including the fluid-attenuated inversion recovery (FLAIR) sequence and diffusion-weighted imaging (DWI) of six male patients with WE aged from 25 to 38 years (mean age 31 years) were evaluated. Results: In all subjects, T2-weighted sequences, FLAIR and DWI revealed a signal hyperintensity within the posteromedial thalami and surrounding the third ventricle. In particular, on coronal images, the hyperintense areas around the third ventricle showed a suggestive 'double wing' configuration. We observed an increased signal on proton-density and T2-weighted images in the mamillary bodies of three patients. Four patients demonstrated additional hyperintensities within the periaqueductal region and/or the tectal plate. At least one lesion area in five of six patients demonstrated contrast enhancement. Conclusion: The consistent imaging findings of our study suggest that MRI is a reliable means of diagnosing WE. Acute WE is sometimes underdiagnosed, yet early diagnosis and treatment of WE is crucial in order to avoid persistent brain damage. MRI, including postcontrast T1-weighted imaging, DWI beneath standardized T2-weighted imaging, and FLAIR sequences may prove to be a valuable adjunct to clinical diagnosis and to provide additional information in acute and/or subacute WE.

Unlu, Ercument [Department of Radiology, Trakya University School of Medicine, Mimar Sinan m, Muammer Aksoy c, Yorulmaz apt, No 50, D-1 22030 Edirne (Turkey)]. E-mail: drercument@yahoo.com; Cakir, Bilge [Department of Radiology, Trakya University School of Medicine, Mimar Sinan m, Muammer Aksoy c, Yorulmaz apt, No 50, D-1 22030 Edirne (Turkey); Asil, Talip [Department of Neurology, Trakya University School of Medicine, Edirne (Turkey)

2006-01-15

190

Hypereosinophilic syndrome with hepatic involvement : US, CT and MRI findings  

International Nuclear Information System (INIS)

To evaluate the findings of US, CT and MRI in the hepatic involvement of hypereosinophilic syndrome. We reviewed imaging findings of hypereosinophilic syndrome with hepatic involvement in nine patients. Imaging studies were US(n=9), conventional CT(CCT, n=6), dynamic incremental CT(DICT, n=3), and MRI with conventional spin-echo sequence(MRI-CSE, n=3). For DICT, we obtained images of the early arterial phase(n=1), portal venous phase(n=3) and the late venous phase(n=3). T1WI were obtained with 600-700 msec/13-17msec(TR/TE) and T2WI were obtained with 1850-2300 msec/80-90 msec(n=3). Gadolinium-enhanced T1WI were also obtained(n=2). US showed multiple hypoechoic or isoechoic nodules(7/9) and appeared normal(2/9). CCT showed multiple hypodense nodules(5/6) and appeared normal(1/6). DICT showed patchy, multiple hypodense nodules and showed hepatic nodules during the portal venous phase only(3/3). MRI-CSE showed one to several focal high-signal nodules on T2WI and subtle low-signal nodules on T1WI(2/3), and showed several subtle high-signal lesions on Gd-enhanced T1WI(1/2) and appeared normal on T1, T2WI(1/3). Hepatic involvement of hypereosinophilic syndrome showed varied imaging findings on US, CT and MRI

191

Clinical features and MRI findings of blow-out fracture  

Energy Technology Data Exchange (ETDEWEB)

Precise anatomical understanding of orbital blow-out fracture lesions is necessary for the treatment of patients. Retrospectively, MRI findings were compared with the clinical features of pure type blow-out fractures and the efficacy of MRI in influencing a decision for surgical intervention was evaluated. Eighteen child (15 boys, 3 girls) cases were evaluated and compared with adult cases. The patients were classified into three categories (Fig.1) and two types (Fig.2) in accordance with the degree of protrusion of fat tissue. The degree of muscle protrusion also was divided into three categories (Fig. 3). Both muscle and fat tissue were protruding from the fracture site in 14 cases. Fat tissue protrusion alone was found in 3 cases. In contrast, no protrusion was seen in one case. The incarcerated type of fat prolapse was found in 40% of cases, while muscle tissue prolapse was found in 75% of patients. Marginal irregularity or swelling of muscle was observed in 11 patients. There was good correlation of ocular motor disturbance and MRI findings. Disturbance of eyeball movement was observed in all patients with either incarcerated fat tissue or marginal irregularity or swelling of muscle. In contrast, restriction of eyeball movement was rare in cases of no incarceration, even if the fracture was wide. Deformity or marginal irregularity of the ocular muscle demonstrated in MRI may suggest damage an adhesion to the muscle wall. When MRI reveals incarceration or severe prolapse of fat tissue, or deformity and marginal irregularity of the ocular muscle, surgical intervention should be considered. (author)

Yamanouchi, Yasuo; Yasuda, Takasumi; Kawamoto, Keiji [Kansai Medical Univ., Moriguchi, Osaka (Japan); Inagaki, Takayuki; Someda, Kuniyuki

1996-06-01

192

Spinal dural involvement in Erdheim-Chester disease: MRI findings  

International Nuclear Information System (INIS)

There are very few reported cases of Erdheim-Chester disease that document involvement of dura at the level of the spinal cord. Among these reports, we know of no publication that includes detailed MRI findings. To the best of our knowledge, the case presented here is the first published report of this specific manifestation of Erdheim-Chester disease that includes detailed MRI findings in addition to the related history. Spinal manifestations of Erdheim-Chester disease in our patient were at the dorsal and lumbar levels (T1-T6 and T12-T11 respectively). Both epidural and subdural linear large masses were present, causing spinal cord compression at the dorsal level and epidural thickening at the lumbar level. (orig.)

193

MRI findings in crural compartment syndrome: a case series.  

Science.gov (United States)

Compartment syndrome occurs when the pressure inside a closed fascial compartment increases to a level that compromises the blood supply to the structures. Untreated compartment syndrome commonly leads to muscle necrosis, limb amputation, and, if it is severe, which is seen in large compartments, renal failure and death may occur. We discussed MRI findings of crural compartment syndrome based on the case series. PMID:24026220

Y?lmaz, Temel Fatih; Toprak, Huseyin; Bilsel, Kerem; Ozdemir, Hüseyin; Aralasmak, Ayse; Alkan, Alpay

2014-02-01

194

Case report. Tuberculous epididymo-orchitis: MRI findings.  

Science.gov (United States)

A 70-year-old man presented with fever, left flank pain and scrotal enlargement. CT scan of the thorax and abdomen revealed findings compatible with pulmonary and kidney tuberculous involvement. Sonographic and MRI examination of the scrotum showed bilateral testicular enlargement and the presence of multiple nodules involving both the testis and the epididymis. Urine cultures obtained from a percutaneous left nephrostomy were positive for tuberculous bacilli, and the patient was placed on anti-tuberculous treatment. PMID:18487383

Tsili, A C; Tsampoulas, C; Giannakis, D; Papastefanaki, M; Tsiriopoulos, I; Sofikitis, N; Efremidis, S C

2008-06-01

195

Adenomatoid odontogenic tumor: correlation of MRI with histopathological findings.  

Science.gov (United States)

Adenomatoid odontogenic tumor is a rare benign and odontogenic tumor that is frequently misdiagnosed as other odontogenic cysts and tumors on radiographic examination. To acquire additional information of adenomatoid odontogenic tumor, we performed magnetic resonance imagings (MRI) at a case of adenomatoid odontogenic tumor. The lesion was divided between the peripheral portion with a thick circular shape and the central portion with a round shape on the basis of the signal intensity (SI) of MRI. The peripheral portion showed intermediate SI contained multifocal no SI on T1WI, high SI contained multifocal no SI on T2WI, and heterogeneous enhancement on CE-T1WI. These multifocal areas corresponded to the numerous punctate radiopaque foci shown on computed tomography. The central portion showed homogeneous low SI on T1WI, homogeneous very high SI on T2WI, and no enhancement on CE-T1WI. Macroscopic examination revealed the round shaped lesion included one large cystic space correspondent to the central portion with a clear cystic wall correspondent to the peripheral portion on MRI. The MRI features corresponded to the macroscopic findings of the histopathological examination. PMID:12350405

Konouchi, Hironobu; Asaumi, Jun-ichi; Yanagi, Yoshinobu; Hisatomi, Miki; Kishi, Kanji

2002-10-01

196

Breast Ductal Carcinoma in Situ: Morphologic and Kinetic MRI Findings  

Science.gov (United States)

Background Adequate diagnosis of ductal carcinoma in situ (DCIS) could lead to efficacious treatment. Due to the fact that DCIS lesions can progress to invasive carcinomas and that the sensitivity of the standard examination – mammography – is between 70 and 80%, use of a more sensitive diagnostic tool was needed. In detection of DCIS, contrast-enhanced magnetic resonance imaging (CE-MRI) has the sensitivity up to 96%. Objectives Morphological features and kinetic parameters were evaluated to define the most regular morphological, kinetic and morpho-kinetic patterns on MRI assessment of breast ductal carcinoma in situ (DCIS). Patients and Methods We retrospectively assessed eighteen patients with 23 histologically confirmed lesions (mean age, 52.4 ± 10.5 years). All patients were clinically and mammographically examined prior to MRI examination. Results DCIS appeared most frequently as non-mass-like lesions (12 lesions, 52.17%). The differences in the frequency of lesion types were statistically significant (P0.05). There was no significant difference in the frequency of morpho-kinetic patterns. Conclusion Non-mass-like lesions, lesions with focal or segmental distribution, with a “plateau” enhancement curve type were the most frequent findings of DCIS lesions on MRI. PMID:24046788

Nadrljanski, Mirjan M.; Markovi?, Biljana B.; Miloševi?, Zorica ?.

2013-01-01

197

MRI findings in the cervical spine of healthy volunteers  

International Nuclear Information System (INIS)

We examined the MRI images of the cervical spine obtained in 117 normal volunteers. There were 66 males and 51 females, and their age range was 7-72 years old (mean age : 40 years). We evaluated the MRI images, for disc degeneration as manifested by using low signal intensity, posterior disc protrusion, narrowing of the disc space, foraminal stenosis, and hypertrophy of the ligamentum flavum. MRI equipment used was a SIGNA 1.5T machine (GE), and sagittal T2-weighted images (repetition time (TR) 4000 ms, echo time (TE) 100 ms, Matrix 512 x 512, field of view (FOV) 24 cm x 24 cm) and axial T1-weighted images (TR 500 ms, TE 10 ms, Matrix 512 x 512, FOV 20 cm x 20 cm) were acquired. The evidence of degeneration of the cervical spine increased linearly with age, especially from 60 years of age onward. Disc degeneration was present in 67% of the disc in men and in 50% of the discs in the females under 20 years old. Narrowing of the disc space was present in 52%, posterior disc protrusion was present in 32%, foraminal stenosis was present in 13%, and hypertrophy of ligamentum flavum was present in 22%. Compression of the dural sac was observed in 44%, but spinal cord compression was observed only in 8%. The results show that care must be exercised when for interpreting the MRI findings in patients with symptomatic disorders of the cervical spine. (author)

198

Brain MRI findings in infants with primary congenital glaucoma  

International Nuclear Information System (INIS)

Congenital glaucoma appears in the first months of life, eventually at birth. Isolated congenital glaucoma is characterized by minor malformations of the irido-corneal angle of the anterior chamber of the eye. Clinical manifestations include tearing, photophobia and enlargement of the globe appearing in the first months of life. Imaging technology such as optical coherence tomography and measurement of central corneal thickness may play an important role in the assessment of children with suspected or known glaucoma. However, no MRI findings of the CNS in patients with primary congenital glaucoma (PCG) were reported in the literature. The purpose of this study was to investigate MRI findings of the brain in infants with PCG. We reviewed the radiological and histopathological and clinical characteristics of infants with primary congenital glaucoma. The records of 17 patients with PCG were reviewed and the MRIs of the brain and associated manifestations were analyzed. Three patients with PCG had abnormal MRI findings suggesting agenesis of the corpus callosum. Two infants had delayed myelinization of the brain. Significant abnormal optic nerve excavation and increased corneal diameters in 2 patients with delayed myelinization may suggest that intraocular pressure can be more striking and more severe, revealing a close relationship with PCG and abnormal myelinization in white matter. Studies with more patients are needed to confirm these results. (author)rm these results. (author)

199

Brain MRI findings in infants with primary congenital glaucoma  

Directory of Open Access Journals (Sweden)

Full Text Available Background: Congenital glaucoma appears in the first months of life, eventually at birth. Isolated congenital glaucoma is characterized by minor malformations of the irido-corneal angle of the anterior chamber of the eye. Clinical manifestations include tearing, photophobia and enlargement of the globe appearing in the first months of life. Imaging technology such as optical coherence tomography and measurement of central corneal thickness may play an important role in the assessment of children with suspected or known glaucoma. However, no MRI findings of the CNS in patients with primary congenital glaucoma (PCG were reported in the literature. The purpose of this study was to investigate MRI findings of the brain in infants with PCG. Methods: We reviewed the radiological, histopathological and clinical characteristics of infants with primary congenital glaucoma. The records of 17 patients with PCG were reviewed and the MRIs of the brain and associated manifestations were analyzed. Results: Three patients with PCG had abnormal MRI findings suggesting agenesis of the corpus callosum. Two infants had delayed myelinization of the brain. Discussion: Significant abnormal optic nerve excavation and increased corneal diameters in 2 patients with delayed myelinization may suggest that intraocular pressure can be more striking and more severe, revealing a close relationship with PCG and abnormal myelinization in the white matter. Studies with more patients are needed to confirm these results.

Dai Alper

2007-01-01

200

Scimitar syndrome: complete anatomical and functional diagnosis with gadolinium-enhanced and velocity-encoded cine MRI  

International Nuclear Information System (INIS)

We report an asymptomatic 8-year-old girl with anomalous pulmonary venous connection to the IVC and systemic arterial supply (scimitar syndrome). We present for the first time a description of gadolinium-enhanced 3D MR angiography that provided concurrent non-invasive complete anatomical (arterial and venous supply) and 'functional' (calculation of left-to-right shunt using phase-contrast-MRI performed in the ascending aorta, main pulmonary artery and anomalous pulmonary vein) diagnosis, avoiding the need for more traditional invasive techniques. As the shunt quantification was less than 2:1, conservative management was decided upon. (orig.)

 
 
 
 
201

Imaging Findings of Brain Death on 3-Tesla MRI  

Energy Technology Data Exchange (ETDEWEB)

To demonstrate the usefulness of 3-tesla (3T) magnetic resonance imaging (MRI) including T2-weighted imaging (T2WI), diffusion weighted imaging (DWI), time-of-flight (TOF) magnetic resonance angiography (MRA), T2*-weighted gradient recalled echo (GRE), and susceptibility weighted imaging (SWI) in diagnosing brain death. Magnetic resonance imaging findings for 10 patients with clinically verified brain death (group I) and seven patients with comatose or stuporous mentality who did not meet the clinical criteria of brain death (group II) were retrospectively reviewed. Tonsilar herniation and loss of intraarterial flow signal voids (LIFSV) on T2WI were highly sensitive and specific findings for the diagnosis of brain death (p < 0.001 and < 0.001, respectively). DWI, TOF-MRA, and GRE findings were statistically different between the two groups (p = 0.015, 0.029, and 0.003, respectively). However, cortical high signal intensities in T2WI and SWI findings were not statistically different between the two group (p = 0.412 and 1.0, respectively). T2-weighted imaging, DWI, and MRA using 3T MRI may be useful for diagnosing brain death. However, SWI findings are not specific due to high false positive findings.

Sohn, Chul Ho [Dept. of Radiology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul (Korea, Republic of); Lee, Hwa Pyung [Dept. of Occupational and Environmental Medicine, CHA Gumi Medical Center, CHA University, Gumi (Korea, Republic of); Park, Jun Beom [Dept. of Radiology, Korean Armed Force Daejeon Hospital, Daejeon (Korea, Republic of); Chang, Hyuk Won; Kim, Easlmaan; Park, Ui Jun; Kim, Hyoung Tae [Keimyung University College of Medicine, Dongsan Medical Center, Daegu (Korea, Republic of); Kim, Eun Hee [Dept. of Radiology, Seoul National University Bundang Hospital, Seongnam (Korea, Republic of); Ku, Jeong Hun [Dept. of Biomedical Engineering, Keimyung University College of Medicine, Daegu (Korea, Republic of)

2012-09-15

202

Imaging Findings of Brain Death on 3-Tesla MRI  

International Nuclear Information System (INIS)

To demonstrate the usefulness of 3-tesla (3T) magnetic resonance imaging (MRI) including T2-weighted imaging (T2WI), diffusion weighted imaging (DWI), time-of-flight (TOF) magnetic resonance angiography (MRA), T2*-weighted gradient recalled echo (GRE), and susceptibility weighted imaging (SWI) in diagnosing brain death. Magnetic resonance imaging findings for 10 patients with clinically verified brain death (group I) and seven patients with comatose or stuporous mentality who did not meet the clinical criteria of brain death (group II) were retrospectively reviewed. Tonsilar herniation and loss of intraarterial flow signal voids (LIFSV) on T2WI were highly sensitive and specific findings for the diagnosis of brain death (p < 0.001 and < 0.001, respectively). DWI, TOF-MRA, and GRE findings were statistically different between the two groups (p = 0.015, 0.029, and 0.003, respectively). However, cortical high signal intensities in T2WI and SWI findings were not statistically different between the two group (p = 0.412 and 1.0, respectively). T2-weighted imaging, DWI, and MRA using 3T MRI may be useful for diagnosing brain death. However, SWI findings are not specific due to high false positive findings.

203

MRI findings of prolonged post-traumatic sternal pain  

International Nuclear Information System (INIS)

The objective of this study was to characterize the different causes of prolonged sternal pain following thoracic trauma with involvement of the sternum and to define criteria for sternal nonunion diagnosis using MRI. Five patients with abnormalities of the sternum were evaluated for prolonged sternal pain following thoracic trauma using MRI. MR images were evaluated by two radiologists in consensus. The patients were selected from the radiology database, which included 8 patients with post-traumatic prolonged sternal pain. Two patients (n = 2) revealed a sternal nonunion after sternal fracture. One patient had a sternal fracture with delayed union and minor displacement of the sternal halves. Abnormal signal intensity alterations adjacent to and within the manubrio-sternal joint were evident in 2 patients and considered due to trauma-related changes in the manubrio-sternal joint. The 3 patients who were not included in the study had no abnormalities of the sternum: 1 of them proved to have a well-healed sternal fracture and nonunion of a rib fracture, 1 had subtle Tietze's syndrome, and 1 patient revealed no pathological findings on imaging. Various factors may be responsible for prolonged sternal pain following thoracic trauma, and these can be viewed with MRI. In cases of sternal nonunion there was common fluid-like signal in the fracture interspace between the bony edges, and the bone marrow adjacent to the nonunion showed altered signal intensity. MRI identified altered signal intensity. MRI identified sternal nonunion and other trauma-related abnormalities of the sternum following chest trauma. (orig.)

204

MRI and neurological findings in patients with spinal metastases  

Energy Technology Data Exchange (ETDEWEB)

Background. Magnetic resonance imaging (MRI) is the recommended primary investigation method for metastatic spinal cord compression (MSCC). Initiating treatment before the development of motor deficits is essential to preserve neurological function. However, the relationship between MRI-assessed grades of spinal metastatic disease and neurological status has not been widely investigated. Purpose. To analyze the association between neurological function and MRI-based assessment of the extent of spinal metastases using two different grading systems. Material and Methods. A total of 284 patients admitted to our institution for initial radiotherapy or surgery for symptomatic spinal metastases were included in the study. Motor and sensory deficits were categorized according to the Frankel classification system. Pre-treatment MRI evaluations of the entire spine were scored for the extent of spinal metastases, presence and severity of spinal cord compression, and nerve root compression. Two MRI-based scales were used to evaluate the degree of cord compression and spinal canal narrowing and relate these findings to neurological function. Results. Of the patients included in the study, 28 were non-ambulatory, 49 were ambulatory with minor motor deficits, and 207 had normal motor function. Spinal cord compression was present in all patients with Frankel scores of B or C, 23 of 35 patients with a Frankel score of D (66%), and 48 of 152 patients with a Frankel score of E (32%). The percentage of patients with severe spinal canal narrowing increased with increasing Frankel grades. The grading according to the scales showed a significant association with the symptoms according to the Frankel scale (P < 0.001). Conclusion. In patients with neurological dysfunction, the presence and severity of impairment was associated with the epidural tumor burden. A significant number of patients had radiological spinal cord compression and normal motor function (occult MSCC)

Switlyk, M.D.; Hole, K.H.; Knutstad, K. [Department of Radiology and Nuclear Medicine, Oslo University Hospital, Norwegian Radium Hospital, Oslo (Norway)], E-mail: marta.switlyk@radiumhospitalet.no; Skjeldal, S.; Zaikova, O. [Department of Orthopedics, Oslo University Hospital, Norwegian Radium Hospital, Oslo (Norway); Hald, J.K. [Department of Radiology and Nuclear Medicine, Oslo University Hospital, Rikshospitalet, Oslo (Norway); Seierstad, T. [Department of Radiology and Nuclear Medicine, Oslo University Hospital, Norwegian Radium Hospital, Oslo (Norway); Faculty of Health Sciences, Buskerud University College, Drammen (Norway)

2012-12-15

205

Cardiac MRI. Diagnostic gain of an additional axial SSFP chest sequence for the detection of potentially significant extracardiac findings in the cardiac MRI examination setting  

Energy Technology Data Exchange (ETDEWEB)

Purpose: Cardiac MRI (CMRI) is an effective method for imaging of the heart. The aim of our study was to assess whether an axial chest sequence in addition to the standard CMR examination setting has advantages in the detection of potentially significant extracardiac findings (PSEF). Materials and Methods: 400 consecutive patients were imaged at 1.5 T for clinical reasons. In addition to the standard long and short-axis views, an axial SSFP sequence was obtained covering the thorax from the lung apex to the diaphragm. All sequences were separately evaluated for PSEF. Results: A total of 25 PSEF were diagnosed in 400 patients, including 16 pleural effusions, a pulmonary fibrosis, a spondylodiscitis, ascites, lymphadenopathies, relapse of a mamma carcinoma, growth of adrenal glands metastases and diaphragmatic elevation. All 25 PSEF were detected by reading survey sequences. 24 of the 25 PSEF were detected by the additional SSFP chest sequence as well as the CINE sequences. Conclusion: In our study the additional axial SSFP chest sequence didn't show a benefit in the detection of PSEF. With the survey sequences we were able to detect all PSEF. We conclude that survey images should be assessed for additional findings. (orig.)

Roller, F.C.; Schneider, C.; Krombach, G.A. [University Hospital Giessen (Germany). Dept. Radiology; Schuhbaeck, A. [University Hospital Giessen (Germany). Dept. Cardiology; Rolf, A. [Kerckhoff Hospital Bad Nauheim (Germany). Dept. Cardiology

2014-01-15

206

Cardiac MRI. Diagnostic gain of an additional axial SSFP chest sequence for the detection of potentially significant extracardiac findings in the cardiac MRI examination setting  

International Nuclear Information System (INIS)

Purpose: Cardiac MRI (CMRI) is an effective method for imaging of the heart. The aim of our study was to assess whether an axial chest sequence in addition to the standard CMR examination setting has advantages in the detection of potentially significant extracardiac findings (PSEF). Materials and Methods: 400 consecutive patients were imaged at 1.5 T for clinical reasons. In addition to the standard long and short-axis views, an axial SSFP sequence was obtained covering the thorax from the lung apex to the diaphragm. All sequences were separately evaluated for PSEF. Results: A total of 25 PSEF were diagnosed in 400 patients, including 16 pleural effusions, a pulmonary fibrosis, a spondylodiscitis, ascites, lymphadenopathies, relapse of a mamma carcinoma, growth of adrenal glands metastases and diaphragmatic elevation. All 25 PSEF were detected by reading survey sequences. 24 of the 25 PSEF were detected by the additional SSFP chest sequence as well as the CINE sequences. Conclusion: In our study the additional axial SSFP chest sequence didn't show a benefit in the detection of PSEF. With the survey sequences we were able to detect all PSEF. We conclude that survey images should be assessed for additional findings. (orig.)

207

Budd-Chiari syndrome: CT and MRI findings  

International Nuclear Information System (INIS)

Budd-Chiari syndrome is an uncommon but often fatal disorder resulting from obstruction of hepatic venous outflow tract at the level of the hepatic veins, the inferior vena cava. The CT and MRI characteristics of Budd-Chiari syndrome are reviewed in this article especially for displaying the exact site and extent of the obstruction. In addition to this direct sign, the indirect findings of venous obstruction such as the presence of intra-and extrahepatic collateral veins, caudate lobe enlargement, inhomogeneous liver enhancement, and regenerative nodules can also be demonstrated. Awareness of these findings is important for early diagnosis and appropriate treatment. (authors)

208

The diagnosis of breast implant rupture: MRI findings compared with findings at explantation  

International Nuclear Information System (INIS)

Study objective: The aim of this study was to evaluate the accuracy of Magnetic Resonance Imaging (MRI) as performed according to a strict study protocol in diagnosing rupture of silicone breast implants. Material and methods: The study population consisted of 64 women with 118 implants, who had participated in either one or two study MRI examinations, aiming at determining the prevalence and incidence of silent implant rupture, respectively, and who subsequently underwent explantation. Implant rupture status was determined by four independent readers and a consensus diagnosis of either rupture (intracapsular or extracapsular), possible rupture or intact implant was then obtained. Strict predetermined rupture criteria were applied as described in this report and findings at surgery were abstracted in a standardised manner and results compared. Results: At MRI, 66 implants were diagnosed as ruptured, nine as possibly ruptured and 43 as intact. Among the ruptured implants, 27 were categorized as extracapsular. At surgery, on average 297 days after the MRI, 65 of the 66 rupture diagnoses were confirmed, as were 20 of the cases with extracapsular silicone. Eight of the nine possibly ruptured implants were in fact ruptured at surgery. Thirty-four of the 43 intact implants were described as intact at surgery. When categorising possible ruptures as ruptures, there were one false positive and nine false negative rupture diagnoses at MRI yielding an accuracy of 92%, a sensitivRI yielding an accuracy of 92%, a sensitivity of 89%, and a specificity of 97%. Correspondingly, the predictive value of a positive MRI examination was 99% and the predictive value of a negative MRI examination was 79%. Conclusions: We conclude that MRI is highly accurate for identification of silicone breast implant rupture, with a high sensitivity and specificity when evaluation of images are based on presence of well-defined rupture criteria

209

A case of calcified intracranial tuberculoma presenting unique MRI findings  

International Nuclear Information System (INIS)

A 41-year-old male patient was admitted in our Ryukyu University Hospital complaining of parosmia. He had a history of miliary tuberculosis 21 years ago. Neurologically he showed left anosmia and hyperreflexia of the right upper extremity. Plain skull X-P and CT scan revealed a calcified mass, 25 mm in diameter, at the left frontal base. In MRI, the mass showed isointensity using the T1 weighted inversion recovery sequence and heterogenously low intensity using the T2 weighted spin echo sequence. Surgery was performed by bifrontal craniotomy. Then the tumor was removed totally including two coexisting small tumors. Histologically, they consisted of calcified caseous tissue and thick collagen capsule, suggesting old calcified tuberculomas. Postoperative course was uneventful and did not result in meningitis. Antituberculous therapy of streptmycin, isoniazid and rifapicin was given for 2 weeks, started on the operative day. MRI findings were presented in detail and the guideline of antituberculous therapy to the tuberculoma was discussed. (author)

210

MRI findings of cyclops lesions of the knee  

Scientific Electronic Library Online (English)

Full Text Available SciELO South Africa | Language: English Abstract in english Cyclops lesions develop in the anterior aspect of the intercondylar notch typically after anterior cruciate ligament (ACL) reconstruction or injury. It is a lesion consisting of fibrous tissue with or without cartilage and bony components. A cyclops lesion is one of the causes for reduced extension [...] and, in the cases reported here, also knee pain or discomfort after ACL reconstruction. We present the MRI features, particularly the features on proton density weighted turbo spin echo (PDW TSE) and proton density weighted turbo spin echo fat saturation (PDW TSE FS) sequences of four cases of cyclops lesions, and distinguish between the MRI findings of large and small lesions. We also describe a cyclops lesion after a posterior cruciate ligament reconstruction, not described in literature before.

C, Minné; MD, Velleman; FE, Suleman.

2012-04-01

211

Spirometer-controlled cine magnetic resonance imaging to diagnose tracheobronchomalacia in pediatric patients  

DEFF Research Database (Denmark)

Tracheobronchomalacia (TBM) is defined as an excessive collapse of the intrathoracic trachea. Bronchoscopy is the gold standard to diagnose TBM, but bronchoscopy has major disadvantages, such as general anaesthesia. Cine-CT is a non-invasive alternative to diagnose TBM, but its use in children is restricted by ionizing radiation. Our aim was to evaluate the feasibility of spirometer-controlled cine-MRI as alternative to cine-CT in a retrospective study.12 children (mean 12 years, range 7-17), suspected to have TBM, underwent cine-MRI. Static scans were acquired at end-inspiration and expiration covering the thorax using a 3D SPGR sequence. 3D-Dynamic-scans were performed covering only the central airways. TBM was defined as a decrease of the trachea or bronchi diameter greater than 50% at end-expiration in the static and dynamic scans.The success rate of the cine-MRI protocol was 92%. Cine-MRI was compared with bronchoscopy or chest-CT in 7 subjects. TBM was diagnosed by cine-MRI in 7 out of 12 children (58%)and was confirmed by bronchoscopy or CT. In 4 patients, cine-MRI demonstrated tracheal narrowing that was not present in the static scans.Spirometer-controlled cine-MRI is a promising technique to assess TBM in children and has the potential to replace bronchoscopy.

Ciet, Pierluigi; Wielopolski, Piotr

2014-01-01

212

Incidental MRI Findings in Patients with Impaired Cognitive Function  

International Nuclear Information System (INIS)

This study aims to evaluate the incidental findings on brain MRI of patients with cognitive function impairments. We analyzed magnetic resonance (MR) findings of 236 patients with decreased cognitive function. MR protocols include conventional T2 weighted axial images, fluid attenuated inversion recovery axial images, T1 weighted coronal 3-dimensional magnetization-prepared rapid acquisition of gradient echo and diffusion tensor images. We retrospectively evaluated the signal changes that suggest acute/subacute infarction and space occupying lesions which show mass effect. Incidental MR findings were seen in 16 patients. Nine patients (3.8%) showed increased signal intensity on trace map of diffusion tensor images suggesting acute/subacute infarctions. Space occupying lesions were detected in 7 patients, and 3 lesions (1.27%) had mass effect and edema and were considered clinically significant lesions that diminish cognitive functions. Several incidental MR findings were detected in patients with decreased cognitive function, and the incidence of aucte/subacute infarctions were higher. Proper evaluations of MRI in patients with impaired cognitive functions will be helpful in early detection and management of ischemic lesions and space occupying lesions.

213

Pelvic Hydatid Disease: CT and MRI Findings Causing Sciatica  

Energy Technology Data Exchange (ETDEWEB)

Pelvic masses, especially hydatid disease, rarely present with sciatica. We present the computed tomography (CT) and the magnetic resonance imaging (MRI) findings of a 49-year-old female patient with presacral hydatid disease, who was evaluated for her sciatica. We also want to emphasize the importance of assessing the pelvis of patients with symptoms and clinical findings that are inconsistent and that cannot be satisfactorily explained by the spinal imaging findings. isc herniation in the lumbar spine is a well-known etiology of back pains and sciatica, but whenever disc herniation of the lumbar spine is excluded by the employed imaging modalities, then the pelvis should be examined for other possible etiologies of nerve compression. We describe here a patient, who was complaining of sciatica, with no abnormal findings in her lumbar spinal magnetic resonance imaging (MRI). The cause of her sciatica was found to be associated with a pelvic hydatid cyst compressing the lumbosacral nerve plexus. In conclusion, if no pathology is evident for the lumbar discal structures, in connection with the cause of sciatica and lumbar back pains, then the pelvis should also be examined for the possible etiologies of compression of the lumbosacral nerve plexus. Whenever a multiseptated cyst is come across in a patient of an endemic origin with a positive history for hydatid disease like surgery, indicating recurrence, hydatid cyst is the most likely diagnosis.

Sanal, Hatice Tuba; Kocaoglu, Murat; Bulakbasi, Nail; Yildirim, Duzgun [Gulhane Military Medical School, Department of Radiology, 06018, Ankara (Turkmenistan)

2007-12-15

214

MRI findings of multiple focal nodular hyperplasia of the liver  

International Nuclear Information System (INIS)

Objective: To assess the diagnostic value of MRI on multiple focal nodular hyperplasia (FNH) of the liver. Methods: MR images of 9 cases with pathological-confirmed multiple FNH were retrospectively analyzed. MRI features of the lesions were correlated with pathological findings. Results: Multiple FNH was considered in all these 9 cases. Among them, the primary diagnosis was FNH in 5, hepatic adenoma in 3 and fibrolamellar hepatocellular carcinoma in 1 case. A total of 31 lesions were detected in the 9 cases. On T2WI, 19 lesions presented slightly high-signal intensity, and the other 12 presented iso-signal intensity. On T1WI, 12 lesions presented slightly low-signal intensity, 7 presented iso-signal intensity, and the other 12 presented high-signal intensity. On opposed-phase, the signal intensity of 1 lesion dropped unevenly. After bolus injection of contrast agent Gd-DTPA, in hepatic arterial phase 18 lesions showed mild to marked heterogeneous enhancement, 11 showed marked homogeneous enhancement, 1 showed moderate ring-like enhancement, and the last one did not have obvious enhancement. In portal venous and delayed phase, all the lesions turned to iso- or slightly high-signal intensity gradually. Sixteen of 31 lesions presented central scar, which demonstrated mild star-like enhancement in delayed phase. Conclusion: Multiple FNH presented certain MRI features, which contributed to the preoperative diagnosis. (authors)

215

??????????????????MRI?????  

Directory of Open Access Journals (Sweden)

Full Text Available ???????????????????????????????????????????????????——????MRI??(??????????????????????????????????????????????????????????????????????????“?????”???????????????????????????????????????????????????????????????????????????

???

2013-12-01

216

MRI findings of prolonged post-traumatic sternal pain  

Energy Technology Data Exchange (ETDEWEB)

The objective of this study was to characterize the different causes of prolonged sternal pain following thoracic trauma with involvement of the sternum and to define criteria for sternal nonunion diagnosis using MRI. Five patients with abnormalities of the sternum were evaluated for prolonged sternal pain following thoracic trauma using MRI. MR images were evaluated by two radiologists in consensus. The patients were selected from the radiology database, which included 8 patients with post-traumatic prolonged sternal pain. Two patients (n = 2) revealed a sternal nonunion after sternal fracture. One patient had a sternal fracture with delayed union and minor displacement of the sternal halves. Abnormal signal intensity alterations adjacent to and within the manubrio-sternal joint were evident in 2 patients and considered due to trauma-related changes in the manubrio-sternal joint. The 3 patients who were not included in the study had no abnormalities of the sternum: 1 of them proved to have a well-healed sternal fracture and nonunion of a rib fracture, 1 had subtle Tietze's syndrome, and 1 patient revealed no pathological findings on imaging. Various factors may be responsible for prolonged sternal pain following thoracic trauma, and these can be viewed with MRI. In cases of sternal nonunion there was common fluid-like signal in the fracture interspace between the bony edges, and the bone marrow adjacent to the nonunion showed altered signal intensity. MRI identified sternal nonunion and other trauma-related abnormalities of the sternum following chest trauma. (orig.)

Grosse, Alexandra; Grosse, Claudia; Anderson, Suzanne [University Hospital of Berne, Department of Diagnostic, Pediatric and Interventional Radiology, Berne (Switzerland); Steinbach, Lynne [University of California San Francisco, Department of Radiology, San Francisco, CA (United States)

2007-05-15

217

Clinical presentations and MRI findings of angiographically occult vascular malformations  

International Nuclear Information System (INIS)

Various clinical features as well as MRI findings of AOVM (angiographically occult vascular malformation) were studied. Amongst out patients, since January 1988, there have been 30 cases of symptomatic AOVM (20 males, 10 females) including 4 cases with multiple lesions. The age ranged from 3 to 60 years of age, with a mean of 33.4 years. The locations of symptomatic lesions were in the cerebral hemisphere (15), the thalamus (4), the brain stem (8) and in the cerebellum (3). The initial presentations of these 30 cases were either by hemorrhage (18), convulsive seizure (9) or by progressive neurological deficits (3). The initial presentation was not related to the patient's age and the size of the lesion, but apparently related to the location of AOVM. Most of the lesions in the cerebral hemisphere presented seizures, but all of the lesions in the thalamus, the brain stem and the cerebellum disclosed hemorrhage as an initial presentation. In fact it was noticed that brain stem lesions tend to cause repetitive hemorrhage in a relatively short period. AOVM lesions were clearly visualized with T2-weighted MRI images, consisting of high intensity cores with surrounding low intensity rims. Most of the symptomatic lesions were partially enhanced by Gd-DTPA with varied intensity. Dynamic changes in size and enhancement pattern on MRI were occasionally seen, usually accompanied with episodes such as hemorrhage or neurological deterioration. Although AOVMs were angiographically ion. Although AOVMs were angiographically negative some strands indicating draining veins were observed on MRI in several cases. In contrast, none of the nonsymptomatic lesions (22 lesions) demonstrated enhancement effects with Gd-DTPA. (author)

218

MRI findings of muscle involvement in idiopathic hypereosinophilic syndrome  

International Nuclear Information System (INIS)

A 40-year-old white man presented with fever, muscle pain, skin nodules and persistent hypereosinophilia over a period of 1 year. In addition, he had ventricular arrhythmias with episodes of tachycardia. Besides a lack of response to antiparasitic therapy, laboratory and pathological data excluded the diagnosis of trichinosis or any other parasitic infection. The patient's course of the disease over the previous 11/2 years was compatible with hypereosinophilic syndrome. In a muscle biopsy several eosinophilic perivascular and leucocytic intravascular infiltrates were found, indicative of muscle involvement by the disease. This is a report on the MRI findings of muscle involvement in idiopathic hypereosinophilic syndrome. (orig.)

219

Wildervanck or cervico-oculo-acoustic syndrome and MRI findings.  

Science.gov (United States)

In 1952, Wildervanck described the first case of what he styled the cervico-oculo-acoustic (COA) syndrome. This comprises Klippel Feil's (KF) anomaly (congenitally fused cervical vertebrae), congenital sensorineural deafness and Duane's retraction syndrome (deficient abduction with retraction on adduction). Since that original paper, there have been further reports describing this triad, either completely or incompletely. A further case of this syndrome is reported and the first report of MRI head scan findings in this condition is presented. In addition, the origin of mirror movements observed as part of the KF syndrome are discussed. PMID:1880511

Hughes, P J; Davies, P T; Roche, S W; Matthews, T D; Lane, R J

1991-06-01

220

Relationship between MRI and clinical findings in the acromioclavicular joint  

Energy Technology Data Exchange (ETDEWEB)

Objective: To determine the relationship between the magnetic resonance (MR) appearance of the acromioclavicular (AC) joint and the physical findings. Design: A total of 116 consecutive patients underwent routine MR imaging (MRI) of the shoulder over an 18-month period. All MR studies were interpreted by a blinded, experienced musculoskeletal radiologist. Eleven variables were studied: the presence of osteophytes; fluid in the joint; fluid outside the joint; high signal in the clavicle or in the acromion; fluid in the subacromial bursa; irregularity of the joint margins; bulging of the capsule; widening of the joint; the age of the patient; and the presence of a rotator cuff tear. The clinical information was supplied by an experienced shoulder surgeon blinded to the MRI findings. A control group of 23 normal volunteers was also studied. Results: The only statistically significant correlation (P=0.0249) was between high signal in the distal clavicle and degenerative changes found clinically. A weaker relationship existed between fluid in the joint and the clinical examination and between increasing degenerative changes and advancing age. Otherwise, no material relationship was found between any of the other MR abnormalities and the clinical picture. Conclusion: There appears to be no real correlation between the MR appearances and the clinical findings in the AC joint. (orig.)

Jordan, L.K.; Griffiths, H.L. [Department of Radiology, University of Missouri Health Care (United States); Kenter, K. [Department of Orthopedics, University of Missouri Health Care (United States)

2002-09-01

 
 
 
 
221

Relationship between MRI and clinical findings in the acromioclavicular joint  

International Nuclear Information System (INIS)

Objective: To determine the relationship between the magnetic resonance (MR) appearance of the acromioclavicular (AC) joint and the physical findings. Design: A total of 116 consecutive patients underwent routine MR imaging (MRI) of the shoulder over an 18-month period. All MR studies were interpreted by a blinded, experienced musculoskeletal radiologist. Eleven variables were studied: the presence of osteophytes; fluid in the joint; fluid outside the joint; high signal in the clavicle or in the acromion; fluid in the subacromial bursa; irregularity of the joint margins; bulging of the capsule; widening of the joint; the age of the patient; and the presence of a rotator cuff tear. The clinical information was supplied by an experienced shoulder surgeon blinded to the MRI findings. A control group of 23 normal volunteers was also studied. Results: The only statistically significant correlation (P=0.0249) was between high signal in the distal clavicle and degenerative changes found clinically. A weaker relationship existed between fluid in the joint and the clinical examination and between increasing degenerative changes and advancing age. Otherwise, no material relationship was found between any of the other MR abnormalities and the clinical picture. Conclusion: There appears to be no real correlation between the MR appearances and the clinical findings in the AC joint. (orig.)

222

Multidetector CT and MRI findings in periportal space pathologies  

International Nuclear Information System (INIS)

Periportal region is an anatomic space around portal vein comprising hepatic artery, bile duct, nerves, lymphatics and a potential space. Periportal pathologies may involve any of these structures diffusely or focally with characteristic radiologic findings. Radiologic findings can be helpful in differential diagnosis of pathologies of periportal structures including periportal cavernomatous transformation, hepatic artery aneurysm, biliary diseases, neurofibromatosis, lymphoma, langerhans' cell histiocytosis, periportal fatty infiltration and other causes of periportal halo in adult and pediatric patients. Lobar/segmental intrahepatic involvement can be seen in neurofibromatosis, cavernomatous transformation, fatty infiltration and periportal edema. In this review, we discuss CT and MRI findings of periportal pathologies which can be in the form of diffuse or segmental/lobar involvement

223

MRI classification of asymmetric septal hypertrophic cardiomyopathy and its relation to the presence of risk factors.  

Science.gov (United States)

Asymmetric septal hypertrophic cardiomyopathy (ASH) is the common phenotype of hypertrophic cardiomyopathy (HCM). We sought to classify ASH using magnetic resonance imaging (MRI) and to determine whether the MRI classification of ASH is related to the presence of risk factors for HCM. Ninety-three patients with ASH underwent cine and delayed-enhancement MRI. The ASH was classified morphologically using cine MRI at end-diastole. We evaluated the association between the MRI findings and the presence of risk factors in the ASH. The ASH was classified into three subtypes by MRI: contiguous subtype showing various clinical and MRI features (57%), sigmoid subtype (29%) with fewer risk factors, and reverse-curve subtype (14%) in younger patients with the larger myocardial mass and delayed-enhancement, which were significantly related to the risk factors. MRI was used to classify ASH into three subtypes, which might be related to the presence of risk factors. PMID:22392104

Amano, Yasuo; Kitamura, Mitsunobu; Takayama, Morimasa; Tachi, Masaki; Kumita, Shinichiro

2012-12-01

224

Comparative study of the MRI findings of lymphoplasmacyte-rich meningioma with pathological findings  

International Nuclear Information System (INIS)

Objective: To investigate the MRI features of intracranial lymphoplasmacyte-rich meningioma and the correlation between the MRI features and pathologic findings. Methods: The MRI and pathologic data of 7 patients with lymphoplasmacyte-rich meningioma were reviewed retrospectively. All cases were proved by surgery and pathological examinations. Results: All lesions were solitary. The tumors crawled along meninges in 6 cases and in 5 cases the tumors did not appear as mass lesions. In 2 cases, the tumors appeared as half-moon. The boundary of all of the tumors was unclear, accompanying heavy peritumoral brain edema. The brain invasion can be seen in 7 cases. The lesions showed hypo-isointense signal on T1WI in 7 cases, hyper-isointense signal in 5 cases and hypo-isointense in 2 cases on T2WI. Enhancement scan demonstrated marked enhancement in 7 cases. Extensive thickening of the meninges was observed in 6 cases. Pathological results showed that the cells were abundant and diversified, with a great quantity of lymphoplasmacytes, and there were typical meningeal epithelial cells area in the surgical specimen. Conclusion: The MRI findings of lymphoplasmacyte-rich meningioma show some features different from other common meningiomas, which would be helpful to the diagnosis and differential diagnosis. (authors)

225

Adult cerebellar medulloblastoma: CT and MRI findings in eight cases  

Directory of Open Access Journals (Sweden)

Full Text Available Medulloblastoma is a brain tumor of neuroepithelial origin, which represents 15 to 30% of all pediatric brain tumors, and less than 1% of CNS adult neoplasms. We report the imaging findings of 8 adult patients with medulloblastoma. The mean age was 35 years, ranging from 20 to 65 years, and the male:female rate was 3:5. The tumors were predominantly lateral (63%, hyperdense on CT scans (83%, and on the MRI, hypointense on T1 (100% and hyperintense on T2 (80% weighted images. It was seen intratumoral necrosis and cysts in six cases and calcifications in three. Hydrocephalus was observed in 5 cases and brain stem invasion in four. The imaging findings of medulloblastomas in adults are different of those in child, and also nonspecific. Although these tumors are uncommon in adults, they must be considered in the differential diagnosis of cerebellar masses in the posterior fossa of this age group.

Carvalho Neto Arnolfo de

2003-01-01

226

Adult cerebellar medulloblastoma: CT and MRI findings in eight cases  

International Nuclear Information System (INIS)

Medulloblastoma is a brain tumor of neuro epithelial origin, which represents 15 to 30% of all pediatric brain tumors, and less than 1% of CNS adult neoplasms. We report the imaging findings of 8 adult patients with medulloblastoma. The mean age was 35 years, ranging from 20 to 65 years, and the male:female rate was 3:5. The tumors were predominantly lateral (63%), hyperdense on CT scans (83%), and on the MRI, hypointense on T1 (100%) and hyperintense on T2 (80%) weighted images. It was seen intratumoral necrosis and cysts in six cases and calcifications in three. Hydrocephalus was observed in 5 cases and brain stem invasion in four. The imaging findings of medulloblastomas in adults are different of those in child, and also nonspecific. Although these tumors are uncommon in adults, they must be considered in the differential diagnosis of cerebellar masses in the posterior fossa of this age group. (author)

227

Adult cerebellar medulloblastoma: CT and MRI findings in eight cases  

Energy Technology Data Exchange (ETDEWEB)

Medulloblastoma is a brain tumor of neuro epithelial origin, which represents 15 to 30% of all pediatric brain tumors, and less than 1% of CNS adult neoplasms. We report the imaging findings of 8 adult patients with medulloblastoma. The mean age was 35 years, ranging from 20 to 65 years, and the male:female rate was 3:5. The tumors were predominantly lateral (63%), hyperdense on CT scans (83%), and on the MRI, hypointense on T1 (100%) and hyperintense on T2 (80%) weighted images. It was seen intratumoral necrosis and cysts in six cases and calcifications in three. Hydrocephalus was observed in 5 cases and brain stem invasion in four. The imaging findings of medulloblastomas in adults are different of those in child, and also nonspecific. Although these tumors are uncommon in adults, they must be considered in the differential diagnosis of cerebellar masses in the posterior fossa of this age group. (author)

Carvalho Neto, Arnolfo de; Bertoldi, Guilherme A. [Parana Univ., Curitiba, PR (Brazil). Radiologia Diagnostica]. E-mail: arnolfo.carvalho@avalon.sul.com.br; Gasparetto, Emerson L. [Parana Univ., Curitiba, PR (Brazil). Hospital das Clinicas. Secao de Radiologia Diagnostica; Ono, Sergio E. [Parana Univ., Curitiba, PR (Brazil). Faculdade de Medicina; Gomes, Andre F. [Diagnostico Avancado Por Imagem (DAPI), Curitiba, PR (Brazil)

2003-06-01

228

Chondromyxoid fibroma of the temporal bone: CT and MRI findings  

Energy Technology Data Exchange (ETDEWEB)

We present the case of a 44-year-old woman with chondromyxoid fibroma of temporal bone origin. Since this is the least common bone tumor of cartilaginous origin, it is highly unusual to find this tumor in the skull. In fact, the literature describes 18 cases of this form of neoplasia arising in the skull, only 4 of these having originated in the temporal bone. To date, the radiological features of these tumors, and especially features detected using the latest imaging modalities, have not been described in detail. This report is unique in that it is the first to present a case of chondromyxoid fibroma of the temporal bone accompanied by detailed CT and MRI findings. (orig.)

Tarhan, N.C.; Yologlu, Z.; Tutar, N.U.; Coskun, M.; Agildere, A.M. [Baskent Univ. School of Medicine, Bahcelievler Ankara (Turkey). Dept. of Radiology; Arikan, U. [Baskent Univ. School of Medicine, Bahcelievler Ankara (Turkey). Dept. of Pathology

2000-10-01

229

Rare case of acute dengue encephalitis with correlated MRI findings  

International Nuclear Information System (INIS)

Dengue encephalitis is extremely rare, with most patients showing no significant abnormality on neuroimaging (CT/MRI). We report one of the very few documented cases of dengue encephalitis, with abnormal signal intensities on all major sequences on brain MRI.

230

Brain CT and MRI findings in fat embolism syndrome  

International Nuclear Information System (INIS)

To elucidate brain CT and MRI findings in fat embolism syndrome (FES), we retrospectively analyzed images from 5 patients with FES during the acute and subacute stages. Brain CT examinations demonstrated brain edema in 2 patients and transient spotty low density lesions in 2 patients. Three patients showed no abnormalities. Brain MRI, however, showed brain abnormalities in all patients during the acute stages. These were revealed as spotty high signal intensity lesions on T2WI, and some showed low intensity on T1WI. These spotty lesions were considered to reflect edematous fluid occurring as a result of the unique pathophysiological condition of FES. While the spotty high signal intensity lesions on T2WI were distributed in the cerebrum, cerebellum, brain stem, thalamus, basal ganglia, internal capsule and corpus callosum, cerebral and cerebellar spotty lesions were characteristically located along the boundary zones of the major vascular territories. This characteristic location might be induced by a hypoxic brain condition in FES because the numerous fat globules present in this condition can block entire brain capillaries. This characteristic signal location on T2WI is a useful indicator for differentiating FES from the primary intra-axial brain injury in patients with multifocal trauma. (author)

231

Case of calcified intracranial tuberculoma presenting unique MRI findings  

Energy Technology Data Exchange (ETDEWEB)

A 41-year-old male patient was admitted in our Ryukyu University Hospital complaining of parosmia. He had a history of miliary tuberculosis 21 years ago. Neurologically he showed left anosmia and hyperreflexia of the right upper extremity. Plain skull X-P and CT scan revealed a calcified mass, 25 mm in diameter, at the left frontal base. In MRI, the mass showed isointensity using the T/sub 1/ weighted inversion recovery sequence and heterogenously low intensity using the T/sub 2/ weighted spin echo sequence. Surgery was performed by bifrontal craniotomy. Then the tumor was removed totally including two coexisting small tumors. Histologically, they consisted of calcified caseous tissue and thick collagen capsule, suggesting old calcified tuberculomas. Postoperative course was uneventful and did not result in meningitis. Antituberculous therapy of streptmycin, isoniazid and rifapicin was given for 2 weeks, started on the operative day. MRI findings were presented in detail and the guideline of antituberculous therapy to the tuberculoma was discussed.

Kinjo, Toshihiko; Mukawa, Jiro; Miyagi, Kouichi; Takara, Eiichi; Mekaru, Susumu; Ishikawa, Yasunari

1988-05-01

232

Cine magnetic resonance imaging for evaluation of cardiac structure and flow dynamics in congenital heart disease  

International Nuclear Information System (INIS)

Cine magnetic resonance imaging (Cine MRI) was performed in 20 patients aged 19 days to 13 years (mean 4.0 years), who had congenital heart disease confirmed at echocardiography or angiography. Prior to cine MRI, gated MRI was performed to evaluate for cardiac structure. Cine MRI was demonstrated by fast low fip angle shot imaging technique with a 30deg flip angle, 15 msec echo time, 30-40 msec pulse repetition time, and 128 x 128 acquisition matrix. Abnormalities of cardiac structure were extremely well defined in all patients by gated MRI. Intracardiac or intravascular blood flow were visualized in 17 (85%) of 20 patients by cine MRI. Left to right shunt flow through ventricular septal defect, atrial septal defect, and endocardial cushion defect were visualized with low signal intensity area. Low intensity jets flow through the site of re-coarctation of the aorta were also visualized. However, the good recording of cine MRI was not obtained because of artifacts in 3 of 20 patients (15%) who had severe congestive heart failure or respiratory arrhythmia. Gated MRI provides excellent visualization of fine structure, and cine MRI can provide high spatial resolution imaging of flow dynamic in a variety of congenital heart disease, noninvasively. (author)

233

Cardiac MRI: evaluation of phonocardiogram-gated cine imaging for the assessment of global und regional left ventricular function in clinical routine  

International Nuclear Information System (INIS)

To validate a phonocardiogram (PCG)-gated cine imaging approach for the assessment of left ventricular (LV) function. In this prospective study, cine MR imaging of the LV was performed twice in 79 patients by using retrospectively PCG- and retrospectively ECG-gated cine SSFP sequences at 1.5 T. End-diastolic volumes (EDV), end-systolic volumes (ESV), stroke volumes (SV), ejection fraction (EF), muscle mass (MM), as well as regional wall motion were assessed. Subgroup analyses were performed for patients with valvular defects and for patients with dysrhythmia. PCG-gated imaging was feasible in 75 (95%) patients, ECG-gating in all patients. Excellent correlations were observed for all volumetric parameters (r > 0.98 for all variables analysed). No significant differences were observed for EDV (-0.24 ± 3.14 mL, P = 0.5133), ESV (-0.04 ± 2.36 mL, P = 0.8951), SV (-0.20 ± 3.41 mL, P = 0.6083), EF (-0.16 ± 1.98%, P = 0.4910), or MM (0.31 ± 4.2 g, P = 0.7067) for the entire study cohort, nor for either of the subgroups. PCG- and ECG-gated cine imaging revealed similar results for regional wall motion analyses (115 vs. 119 segments with wall motion abnormalities, P = 0.3652). The present study demonstrates that PCG-gated cine imaging enables accurate assessment of global and regional LV function in the vast majority of patients in clinical routine. (orig.)

234

Cardiac MRI: evaluation of phonocardiogram-gated cine imaging for the assessment of global und regional left ventricular function in clinical routine  

Energy Technology Data Exchange (ETDEWEB)

To validate a phonocardiogram (PCG)-gated cine imaging approach for the assessment of left ventricular (LV) function. In this prospective study, cine MR imaging of the LV was performed twice in 79 patients by using retrospectively PCG- and retrospectively ECG-gated cine SSFP sequences at 1.5 T. End-diastolic volumes (EDV), end-systolic volumes (ESV), stroke volumes (SV), ejection fraction (EF), muscle mass (MM), as well as regional wall motion were assessed. Subgroup analyses were performed for patients with valvular defects and for patients with dysrhythmia. PCG-gated imaging was feasible in 75 (95%) patients, ECG-gating in all patients. Excellent correlations were observed for all volumetric parameters (r > 0.98 for all variables analysed). No significant differences were observed for EDV (-0.24 {+-} 3.14 mL, P = 0.5133), ESV (-0.04 {+-} 2.36 mL, P = 0.8951), SV (-0.20 {+-} 3.41 mL, P = 0.6083), EF (-0.16 {+-} 1.98%, P = 0.4910), or MM (0.31 {+-} 4.2 g, P = 0.7067) for the entire study cohort, nor for either of the subgroups. PCG- and ECG-gated cine imaging revealed similar results for regional wall motion analyses (115 vs. 119 segments with wall motion abnormalities, P = 0.3652). The present study demonstrates that PCG-gated cine imaging enables accurate assessment of global and regional LV function in the vast majority of patients in clinical routine. (orig.)

Nassenstein, Kai; Schlosser, Thomas [University Hospital Essen, Department of Diagnostic and Interventional Radiology and Neuroradiology, Essen (Germany); Orzada, Stephan [University Duisburg-Essen, Erwin L. Hahn Institute for Magnetic Resonance Imaging, Essen (Germany); Haering, Lars; Czylwik, Andreas [University Duisburg-Essen, Department of Communication Systems, Duisburg (Germany); Zenge, Michael; Mueller, Edgar [Siemens Healthcare, Erlangen (Germany); Eberle, Holger; Bruder, Oliver [Elisabeth Hospital Essen, Department of Cardiology and Angiology, Essen (Germany); Ladd, Mark E.; Maderwald, Stefan [University Hospital Essen, Department of Diagnostic and Interventional Radiology and Neuroradiology, Essen (Germany); University Duisburg-Essen, Erwin L. Hahn Institute for Magnetic Resonance Imaging, Essen (Germany)

2012-03-15

235

MRI findings of muscle involvement in idiopathic hypereosinophilic syndrome  

Energy Technology Data Exchange (ETDEWEB)

A 40-year-old white man presented with fever, muscle pain, skin nodules and persistent hypereosinophilia over a period of 1 year. In addition, he had ventricular arrhythmias with episodes of tachycardia. Besides a lack of response to antiparasitic therapy, laboratory and pathological data excluded the diagnosis of trichinosis or any other parasitic infection. The patient`s course of the disease over the previous 1{sup 1}/{sub 2} years was compatible with hypereosinophilic syndrome. In a muscle biopsy several eosinophilic perivascular and leucocytic intravascular infiltrates were found, indicative of muscle involvement by the disease. This is a report on the MRI findings of muscle involvement in idiopathic hypereosinophilic syndrome. (orig.) With 3 figs., 25 refs.

Hundt, W.; Staebler, A.; Reiser, M. [Department of Diagnostic Radiology, Klinikum Grosshadern, Muenchen (Germany)

1999-04-01

236

Dobutamine cine magnetic resonance imaging after myocardial infarction  

International Nuclear Information System (INIS)

Dobutamine Cine MRI is a new diagnostic imaging technique in the pretreatment (revascularization) assessment of myocardial infarction patients. In this issue are reported the result of a comparative study of the diagnostic yield of dobutamine Cine MRI with that of stress echocardiography in the assessment of viable myocardium. A new method for analysis of Cine MR images, employing digital subtraction, aimed at decreasing subjectivity in the quantitative assessment of myocardial wall thickening. Twenty-six patients (21 men and 5 women) with a history of myocardial infarction who were scheduled for revascularization were submitted to stress echocardiography and dobutamine Cine MRI to evaluate contractile recovery of the segments considered akinetic or hypo kinetic at baseline echocardiography. Dobutamine was administered in growing doses (5, 10, 15?/kg/min). 16 segments of the left ventricle in each patient were considered. In the 416 segments studied, it was found that 307 normo kinetic, 64 scarred and 45 viable segments with stress echocardiography, versus 302 normo kinetic, 83 scarred and 31 viable segments with dobutamine MRI. Three months after revascularization 15 patients were examined to check contractile recovery of the segments considered as viable. Echocardiography had 79% sensitivity and 97% specificity, while Cine MRI had 96% and 86%, respectively. In patients with anteroseptal wall myocardial infarction stress echocardiography had 75% sensitivity and 97% cardiography had 75% sensitivity and 97% specificity. Echocardiography permits to distinguish viable myocardium and scarred myocardial tissue with good sensitivity and specificity, but Cine MRI performs better. Cine MRI has much higher sensitivity than stress echocardiography and thus makes the technique of choice to evaluate viable myocardium in these sites. The digital subtraction technique is as accurate as manual measurements, but reduces the error rate and permits quicker evaluation, particularly in subendocardial thickening

237

Bilateral Renal Lymphangiomatosis: Ultrasound, CT, and MRI Findings  

Directory of Open Access Journals (Sweden)

Full Text Available Background/Objective: Renal lymphangiomatosis (RL is a rare disorder characterized by developmental malformation of the lymphatic system surrounding the kidneys. Herein we describe the ultrasound, CT scan, and MRI features of renal lymphangiomatosis in an asymptomatic male patient."nCase Presentation: A 21 years-old man underwent abdominal ultrasound due to 1 month history of dyspepsia and epigastric pain which revealed mild enlargement of both kidneys (right: accompanied by increased renal echogenicity and loss of corticomedullary differentiation . There were also numerous cystic areas of varying size around both kidneys and also extending along the renal hilum into the peripelvic area obliterating renal sinus fat. All were simple cysts without internal echogenicic debris. Subsequently abdominal CT scan was requested in this patient to better evaluation of the extent and nature of the pathology, which revealed bilateral multilocular fluid-filled cystic masses with thin walls in the perirenal and peripelvic region with attenuation measurement of 8 HU. There was a small focus of calcification posterior to the right kidney. MRI of the patient revealed bilaterally enlarged kidneys with multiple hyperintense lesions in both perirenal spaces and the peripelvic area in T2-wieghted images. These cystic spaces appeared hypointense in T1-weighted images with no enhancement in post-contrast images."nDiscussion: The diagnosis of renal lymphangiomatosis can be confirmed with needle aspiration of the typi-cal chylous content of the pernephric collection; however the imaging findings are actually character-istics for this disease and allow a purely radiologic diagnosis to be made confidently; so familiarity with imaging findings of renal lymphangiomatosis is very useful for radiologists and can prevent unnecessary biopsy or even surgery of this most commonly harm-less condition."nThere is no treatment in most cases of this disease as most patients are asymptomatic. Percutaneous drainage has promised useful in conservative manage-ment of symptomatic patients and pregnant women.     

M. H. Bagheri

2008-01-01

238

Digital cine-imaging  

International Nuclear Information System (INIS)

Digitization of fluoroscopic images has been developed for the digital cine imaging system as a result of the computer technology, television technology, and popularization of interventional radiology. Present digital cine imaging system is able to offer images similar to cine film because of the higher operatability and better image quality with the development of interventional radiology. As a result, its higher usefulness for catheter diagnosis examination except for interventional radiology was reported, and the possibility of having filmless cine is close to becoming a reality. However several problems have been pointed out, such as spatial resolution, time resolution, storage and exchangeability of data, disconsolidated viewing functions, etc. Anyhow, digital cine imaging system has some unresolved points and lots the needs to be discussed. The tendency of digitization is the passage of the time and we have to promote a study for more useful digital cine imaging system in team medical treatment which centers on the patients. (author)

239

The diagnostic value of cine-MR imaging in diseases of great vessels  

International Nuclear Information System (INIS)

The diagnostic value of cine magnetic resonance imaging (cine-MRI) was evaluated in 10 patients with diseases of great vessels. The parameters necessary to decide the appropriate treatment, such as presence and extension of intimal flap, DeBakey type classification, identification of the entry, differentiation between true and false lumen, and between thrombosis and slow flow were demonstrated in all patients with dissecting aortic aneurysm. However, abdominal aortic branches could not be demonstrated enough by cine-MRI, therefore conventional AOG was necessary to choose the operative procedure in these cases. In patients with thoracic aortic aneurysm (TAA), cine-MRI was valuable in demonstrating both blood flow and thrombus in the lumen of aneurysm, and AOG was thought to be unnecessary in most cases. Cine-MRI is a promising new technique for the evaluation of diseases of great vessels. (author)

240

[The diagnostic value of cine-MR imaging in diseases of great vessels].  

Science.gov (United States)

The diagnostic value of cine magnetic resonance imaging (cine-MRI) was evaluated in 10 patients with disease of great vessels. The parameters necessary to decide the appropriate treatment, such as presence and extension of intimal flap, DeBakey type classification, identification of the entry, differentiation between true and false lumen, and between thrombosis and slow flow were demonstrated in all patients with dissecting aortic aneurysm. However, abdominal aortic branches could not be demonstrated enough by cine-MRI, therefore conventional AOG was necessary to choose the operative procedure in these cases. In patients with thoracic aortic aneurysm (TAA), cine-MRI was valuable in demonstrating both blood flow and thrombus in the lumen of aneurysm, and AOG was thought to be unnecessary in most cases. Cine-MRI is a promising new technique for the evaluation of diseases of great vessels. PMID:2308242

Sasaki, S; Yoshida, H; Matsui, Y; Sakuma, M; Yasuda, K; Tanabe, T; Chouji, H

1990-02-01

 
 
 
 
241

MRI findings of multiple sclerosis involving the brainstem  

International Nuclear Information System (INIS)

To describe MRI findings of multiple sclerosis involving the brainstem. Among 35 cases of clinically definite multiple sclerosis, the authors retrospectively analysed 20 in which the brainstem was involved. MR images were analysed with regard to involvement sites in the brainstem or other locations, signal intensity, multiplicity, shape, enhancement pattern, and contiguity of brainstem lesions with cisternal or ventricular CSF space. The brainstem was the only site of involvement in five cases (25%), while simultaneous involvement of the brainstem and other sites was observed in 15 cases (75%). No case involved only the midbrain or medulla oblongata, and simultaneous involvement of the midbrain, pons and medulla oblongata was noted in 12 cases (60%). The most frequently involved region of the brainstem was the medulla oblongata (n=13; 90%), followed by the pons (n=17; 85%) and the midbrain (n=16; 80%). Compared with normal white matter, brainstem lesions showed low signal intensity on T1 weighted images, and high signal intensity on T2 weighted, proton density weighted, and FLAIR images. In 17 cases (85%), multiple intensity was observed, and the shape of lesions varied: oval, round, elliptical, patchy, crescentic, confluent or amorphous were seen on axial MR images, and in 14 cases (82%), coronal or sagittal scanning showed that lesions were long and tubular. Contiguity between brainstem lesions and cisternal or ventricular CSF space was seen in all cases (100%) invoSF space was seen in all cases (100%) involving midbrain (16/16) and medulla oblongata (18/18) and in 15 of 17 (88%) involving the pons. Contrast enhancement was apparent in 7 of 12 cases (58%). In the brainstem, MRI demonstrated partial or total contiguity between lesions and cisternal or ventricular CSF space, and coronal or sagittal images showed that lesions were long and tubuler

242

MRI and operative findings of spinal intramedullary tumors  

International Nuclear Information System (INIS)

The MRI findings of spinal intramedullary tumors are not yet established, so we tried to study these tumors, especially astrocytomas and ependymomas, which are the most common intramedullary spinal cord tumors, and to speculate how completely we could remove them. Astrocytomas were isointense on T1-weighted images and high-intense on T2-weighted images, and they were heterogeneously enhanced by Gd-DTPA. During the operation, the boundaries of the tumors were not clear, so they could not be totally removed. Ependymomas which were situated above the conus medullaris were isointense and high-intense on T1- and T2-weighted images respectively. The associated cysts were low- and high-intense on T1-and T2-weighted images respectively. Tumors were enhanced homogeneously by Gd-DTPA and were well-circumscribed, so the majority of the tumors could be removed totally. Ependymomas below the conus medullaris extended in the extramedullary direction from the bottom of the conus and developed downward, involving the cauda equina in 3 cases of the 4, 2 cases of which were myxopapillary ependymomas. On MRI they were isointense on the T1-weighted images, but on the T2-weighted images they were high-intense, including a low-intensity area which showed necrosis or a hemosiderin deposit of an old hemorrhage. Moreover they were enhanced by Gd-DTPA, remaining low-intense on the T2-weighted ima-intense on the T2-weighted images. Since these tumors adhered tightly to the cauda equina, they could not be removed totally. (author)

243

Brain Perfusion MRI Findings in Patients with Behcet's Disease  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Objective. To search brain perfusion MRI (pMRI) changes in Behcet's disease (BD) with or without neurological involvement. Materials and Method. The pMRI were performed in 34 patients with BD and 16 healthy controls. Based on neurologic examination and post-contrast MRI, 12 patients were classified as Neuro-Behcet (group 1, NBD) and 22 patients as BD without neurological involvement (group 2). Mean transit time (MTT), time to peak (TTP), relative cerebral blood volume (rCBV), and relative cer...

Alkan, Alpay; Goktan, Asli; Karincaoglu, Yelda; Kamisli, Suat; Dogan, Metin; Oztanir, Namik; Turan, Nergiz; Kocakoc, Ercan

2012-01-01

244

The MRI findings of well-differentiated liposarcoma  

International Nuclear Information System (INIS)

The purpose of this study was to evaluate the MRI findings of well-differentiated liposarcoma. Ten well-differentiated liposarcomas surgically excised with histologic diagnosis were included in this study. The subjects consisted of five men and five women, with an average age of 62.5 years (range: 43-79 years). Six cases occurred in the thigh, two in the forearm, one in the shoulder, and one in the chest wall. Thickened septa (generally ?2 mm) of low T1 signal and high T2 signal, and prominent area of enhancement were suspicious for well-differentiated liposarcoma. So we checked these lesions and compared with the pathologic findings of these lesions. Thick septa and prominent area of enhancement were identified in all cases except one case who could not use Gadolinium. Pathologically, these lesions were composed of a relatively mature adipocytic proliferation in which, in contrast to benign lipoma, significant variation in cell size is easily appreciable. So we consider that thick septa and prominent area of enhancement are evidently suspicious lesions for well-differentiated liposarcoma. (author)

245

Cine-Club  

CERN Multimedia

  On the occasion of CERN’s 60th anniversary the CERN CineClub will be showing films from all CERN member states Thursday 10 April 2014 at 20:00 CERN Council Chamber   The Bothersome Man     Directed by Jens Lien (Norway, 2006) 95 minutes   Forty-year-old Andreas arrives in a strange city with no memory of how he got there. He is presented with a job, an apartment-even a beautiful girlfriend. But before long, Andreas notices that something is wrong. The people around him seem cut off from any real emotion, and communicate only in superficialities. All this seems to be governed by a shadowy group of technicians, the ominous Caretakers’, who make sure the city runs smoothly. When they find Andreas is not adjusting to his new life, they keep an increasing watch over his activities...”The Bothersome Man” is a fantastic fable, a parable for modern society’s consumerism and obsession with ap...

CineClub

2014-01-01

246

MRI, quantitative MRI, SPECT, and neuropsychological findings following carbon monoxide poisoning.  

Science.gov (United States)

Carbon monoxide (CO) poisoning has been shown to result in neuropathologic changes and cognitive impairments due to anoxia and other related biochemical mechanisms. The present study investigated brain-behaviour relationships between neuropsychological outcome and SPECT, MRI, and Quantitative magnetic resonance imaging (QMRI) in 21 patients with CO poisoning. Ninety-three per cent of the patients exhibited a variety of cognitive impairments, including impaired attention, memory, executive function, and mental processing speed. Ninety-five per cent of the patients experienced affective changes including depression and anxiety. The results from the imaging studies revealed that 38% of the patients had abnormal clinical MRI scans, 67% had abnormal SPECT scans, and 67% had QMRI findings including hippocampal atrophy and/or diffuse cortical atrophy evidenced by an enlarged ventricle-to-brain ratio (VBR). Hippocampal atrophy was also found on QMRI. SPECT and QMRI appear to be sensitive tools which can be used to identify the neuropathological changes and cerebral perfusion defects which occur following CO poisoning. Cerebral perfusion defects include frontal and temporal lobe hypoperfusion. Significant relationships existed between the various imaging techniques and neuropsychological impairments. The data from this study indicate that a multi-faceted approach to clinical evaluation of the neuropathological and neurobehavioural changes following CO poisoning may provide comprehensive information regarding the neuroanatomical and neurobehavioural effects of CO poisoning. PMID:10230524

Gale, S D; Hopkins, R O; Weaver, L K; Bigler, E D; Booth, E J; Blatter, D D

1999-04-01

247

MRI findings of brain damage due to neonatal hypoglycemia  

International Nuclear Information System (INIS)

Objective: To report the MRI findings of brain damage observed in neonatal patients who suffered from isolated hypoglycemia and to explore the value of diffusion-weighted imaging(DWI) in early detection of neonatal hypoglycemic brain injury. Methods: Twelve neonates with isolated hypoglycemia (10 of the 12 were diagnosed to suffer from hypoglycemic encephalopathy) were enrolled in this study. They were first scanned at age from 3 days to 10 days with T1WI, T2WI and DWI(b is 0 s/mm2, 1000 s/mm2), and 4 of them were then scanned from 7 days to 10 days following the initial scan. All acquired MR images were retrospectively analysed. Results: First series of DWI images showed distinct hyperintense signal in 11 cases in several areas including bilateral occipital cortex (2 cases), right occipital cortex (1 case), left occipital cortex and subcortical white matter(1 case), bilateral occipital cortex and subcortical white matter (2 cases), bilateral parieto-occipital cortex (2 cases), bilateral parieto-occipital cortex and subcortical white matter(2 cases), the splenium of corpus callosum (4 cases), bilateral corona radiata( 2 cases), left caudate nucleus and globus pallidus (1 case), bilateral thalamus (1 case), bilaterally posterior limb of internal capsule (1 case). In the initial T1WI and T2WI images, there were subtle hypointensity in the damaged cortical areas (3 cases), hyperintensity in the bilaterally cases), hyperintensity in the bilaterally affected occipital cortex( 1 case) on T1 weighted images, and hyperintensity in the affected cortex and subcortical white matter with poor differentiation on T2 weighted images. The followed-up MRI of 4 cases showed regional encephalomalacia in the affected occipital lobes(4 cases), slightly hyperintensity on T2 weighted images in the damaged occipital cortex (2 cases), extensive demyelination (1 case), disappearance of hyperintensity of the splenium of corpus callosum (1 case), and persistent hyperintensity in the splenium of corpus callosum (1 case) on T2 weighted images. Conclusion: The findings suggest that posterior parieto-occipital regions are most frequently injured in neonatal period due to severe hypoglycemia. DWI is a useful technique in the early detection and evaluation of hypoglycemic brain injury of neonates. (authors)

248

MRI reporting by radiographers: Findings of an accredited postgraduate programme  

Energy Technology Data Exchange (ETDEWEB)

Aim: To analyse the objective structured examination (OSE) results of the first three cohorts of radiographers (n = 39) who completed an accredited postgraduate certificate (PgC) programme in reporting of general magnetic resonance imaging (MRI) investigations and to compare the agreement rates with those demonstrated for a small group of consultant radiologists. Method: Forty MRI investigations were used in the OSE which included the following anatomical areas and abnormal appearances: knee; meniscal/ligament injuries, bone bruises, effusions and osteochondral defects; lumbar spine: intervertebral disc morphology, vertebral collapse, tumours (bone and soft tissue), spinal stenosis and/or nerve root involvement; internal auditory meati (IAM): acoustic neuroma. Incidental findings included maxillary polyp, arachnoid cyst, renal cyst, hydroureter, pleural effusion and metastases (adrenal, lung, perirenal and/or thoracic spine). Sensitivity, specificity and total percentage agreement rates were calculated for all radiographers (n = 39) using all reports (n = 1560). A small representative subgroup of reports (n = 27) was compared to the three consultant radiologists' reports which were produced when constructing the OSE. Kappa values were estimated to measure agreement in four groups: consultant radiologists only; radiographers and each of the consultant radiologists independently. Results: The sensitivity, specificity and agreement rates for the three cohorts (combined) of radiographers were 99.0%, 99.0% and 89.2%, respectively. For the majority (5/9) of anatomical areas and/or pathological categories no significant differences (p < 0.05) were found between the mean Kappa scores (K = 0.47-0.76) for different groups of observers, whether radiographers were included in the group analysis or not. Where differences were apparent, this was in cases (4/9) where the variation was either not greater than found between radiologists and/or of no clinical significance. These results suggest therefore that in an academic setting, these groups of radiographers have the ability to correctly identify normal investigations and are able to provide a report on the abnormal appearances to a high standard. Further work is required to confirm the clinical application of these findings.

Piper, Keith [Allied Heath Professions Department, Canterbury Christ Church University, North Holmes Road, Canterbury, Kent CT1 1QU (United Kingdom)], E-mail: keith.piper@canterbury.ac.uk; Buscall, Kaie [Allied Heath Professions Department, Canterbury Christ Church University, North Holmes Road, Canterbury, Kent CT1 1QU (United Kingdom); Thomas, Nigel [X-Ray Department, Trafford General Hospital, Manchester M41 5SL (United Kingdom)

2010-05-15

249

Cardiac cine MRI: Comparison of 1.5 T, non-enhanced 3.0 T and blood pool enhanced 3.0 T imaging  

Energy Technology Data Exchange (ETDEWEB)

Introduction: Cardiac cine imaging using balanced steady state free precession sequences (bSSFP) suffers from artefacts at 3.0 T. We compared bSSFP cardiac cine imaging at 1.5 T with gradient echo imaging at 3.0 T with and without a blood pool contrast agent. Materials and methods: Eleven patients referred for cardiac cine imaging underwent imaging at 1.5 T and 3.0 T. At 3.0 T images were acquired before and after administration of 0.03 mmol/kg gadofosveset. Blood pool signal-to-noise ratio (SNR), temporal variations in SNR, ejection fraction and myocardial mass were compared. Subjective image quality was scored on a four-point scale. Results: Blood pool SNR increased with more than 75% at 3.0 T compared to 1.5 T (p < 0.001); after contrast administration at 3.0 T SNR increased with 139% (p < 0.001). However, variations in blood pool SNR at 3.0 T were nearly three times as high versus those at 1.5 T in the absence of contrast medium (p < 0.001); after contrast administration this was reduced to approximately a factor 1.4 (p = 0.21). Saturation artefacts led to significant overestimation of ejection fraction in the absence of contrast administration (1.5 T: 44.7 {+-} 3.1 vs. 3.0 T: 50.7 {+-} 4.2 [p = 0.04] vs. 3.0 T post contrast: 43.4 {+-} 2.9 [p = 0.55]). Subjective image quality was highest for 1.5 T (2.8 {+-} 0.3), and lowest for non-enhanced 3.0 T (1.7 {+-} 0.6; p = 0.006). Conclusions: GRE cardiac cine imaging at 3.0 T after injection of the blood pool agent gadofosveset leads to improved objective and subjective cardiac cine image quality at 3.0 T and to the same conclusions regarding cardiac ejection fraction compared to bSSFP imaging at 1.5 T.

Gerretsen, S.C.; Versluis, B.; Bekkers, S.C.A.M. [Maastricht University Hospital, Department of Radiology, Maastricht (Netherlands); Leiner, T. [Maastricht University Hospital, Department of Radiology, Maastricht (Netherlands)], E-mail: leiner@rad.unimaas.nl

2008-01-15

250

Cardiac cine MRI: Comparison of 1.5 T, non-enhanced 3.0 T and blood pool enhanced 3.0 T imaging  

International Nuclear Information System (INIS)

Introduction: Cardiac cine imaging using balanced steady state free precession sequences (bSSFP) suffers from artefacts at 3.0 T. We compared bSSFP cardiac cine imaging at 1.5 T with gradient echo imaging at 3.0 T with and without a blood pool contrast agent. Materials and methods: Eleven patients referred for cardiac cine imaging underwent imaging at 1.5 T and 3.0 T. At 3.0 T images were acquired before and after administration of 0.03 mmol/kg gadofosveset. Blood pool signal-to-noise ratio (SNR), temporal variations in SNR, ejection fraction and myocardial mass were compared. Subjective image quality was scored on a four-point scale. Results: Blood pool SNR increased with more than 75% at 3.0 T compared to 1.5 T (p < 0.001); after contrast administration at 3.0 T SNR increased with 139% (p < 0.001). However, variations in blood pool SNR at 3.0 T were nearly three times as high versus those at 1.5 T in the absence of contrast medium (p < 0.001); after contrast administration this was reduced to approximately a factor 1.4 (p = 0.21). Saturation artefacts led to significant overestimation of ejection fraction in the absence of contrast administration (1.5 T: 44.7 ± 3.1 vs. 3.0 T: 50.7 ± 4.2 [p = 0.04] vs. 3.0 T post contrast: 43.4 ± 2.9 [p = 0.55]). Subjective image quality was highest for 1.5 T (2.8 ± 0.3), and lowest for non-enhanced 3.0 T (1.7 ± 0.6; p = 0.006). Conclusions: GRE cardiac cine imaging at 3.0 T after injection of the blood pool agent gadofosveset lf the blood pool agent gadofosveset leads to improved objective and subjective cardiac cine image quality at 3.0 T and to the same conclusions regarding cardiac ejection fraction compared to bSSFP imaging at 1.5 T

251

Cerebellar ataxia of early onset. Clinical symptoms and MRI findings  

Energy Technology Data Exchange (ETDEWEB)

Eight cases of childhood cerebellar ataxia were reported. All these cases showed chronic cerebellar ataxia with early onset, and the other diseases of cerebellum such as infections, neoplasms and storage diseases were excluded by clinical symptoms and laboratory findings including blood counts, blood chemistry, lactate, pyruvate, ceruloplasmine, urinalysis, serum immunoglobulins, amino acid analysis in blood and urine, CSF analysis, leukocyte lysosomal enzymes, MCV, EMG, EEG and brain X-CT. Two pairs of siblings were included in this study. The clinical diagnosis were cerebellar type (5), spinocerebellar type (1), one Marinesco-Sjoegren syndrome and undetermined type (1). The age of onset was 1 to 5 years. The chief complaint was motor developmental delay in 6 cases; among them 5 patients could walk alone at the ages of 2 to 3 years'. Mental retardation was observed in 7 cases and epilepsy in 2. TRH was effective in 5 cases. The MRI study revealed that the area of medial sagittal slice of the cerebellum was reduced significantly in all cases and also that of pons was reduced in 5 cases. Different from typical adult onset spinocerebellar degenerations, most of the present cases have achieved slow developmental milestones and the clinical course was not progressive. Genetic factors are suspected in the pathogenesis of this disease in some cases. (author).

Yamashita, Sumimasa; Miyake, Shota; Yamada, Michiko; Iwamoto, Hiroko (Kanagawa Children' s Medical Center, Yokohama (Japan)); Yamada, Kazuhiko

1989-07-01

252

MRI findings in acute diffuse axonal injured patients  

International Nuclear Information System (INIS)

Diffuse axonal injury (DAI) in the acute stage was clinically evaluated using magnetic resonance imaging (MRI), which is considered superior to computed tomography (CT) in detecting parenchymal brain lesions. MRI was disadvantageous, however, to patients suffering from acute severe head injury because of the long time required to construct imaging and unstable patient vital signs. We conducted MRI safely under a high magnetic field (1.5 tesla) in acute DAI by close observation and with nonmagnetic respirator and electrocardiographic monitoring. MRI was conducted in 95 patients diagnosed with DAI classified into mild (14), moderate (17) and severe (64) DAI by criteria established by Gennarelli (1986). In patients with mild or moderate DAI, CT revealed no lesion in the parenchymal area although MRI detected lesions in every case, mainly in cortical white matter or basal ganglia. In patients with severe DAI, CT revealed parenchymal lesions in 14 although MRI detected further lesions in cortical white matter, basal ganglia, corpus callosum and brainstem in every case. These results correspond well to the experimental model Gennarelli's. This study concluded that MRI was useful in assessing acute DAI patients. (author)

253

Cowper's syringocele: diagnosis based on MRI findings  

Energy Technology Data Exchange (ETDEWEB)

An 8-year-old boy presenting with intermittent haematuria and dysuria was investigated with voiding cystourethrography (VCUG), urethroscopy and perineal MRI. VCUG and urethroscopy did not provide a definitive diagnosis, while MRI clearly demonstrated a homogeneous, oval cystic lesion extending from the bulbourethral glands and slightly impressing the bulbous urethra. The patient was found to have an imperforate Cowper's syringocele. Treatment consisted of marsupialisation and the patient became symptom free. To the authors' knowledge, this is the first description of the MRI characteristics of an imperforate Cowper's syringocele in a paediatric patient. (orig.)

Kickuth, Ralph; Laufer, Ulf; Kirchner, Tilmann Heinrich; Herbe, Eva; Kirchner, Johannes [Department of Radiology, Marienhospital Herne, University of Bochum, Herne (Germany); Pannek, Juergen [Department of Urology, Marienhospital Herne, University of Bochum, Herne (Germany)

2002-01-01

254

Reversible MRI and CT findings in uremic encephalopathy.  

Science.gov (United States)

In this 35-year-old woman with chronic glomerulonephritis and uremic encephalopathy, the basal ganglia bilaterally, internal capsules and periventricular white matter showed hypodensity on CT, low signal intensity on T1-weighted MRI and high signal intensity on T2-weighted MRI. Following a series of dialyses, her clinical symptoms and blood chemistry improved. The CT and MRI returned to normal. These reversible abnormalities may be caused by reversible ischemic change, but disorders of cerebral metabolism and uremic toxins may contribute. PMID:1780056

Okada, J; Yoshikawa, K; Matsuo, H; Kanno, K; Oouchi, M

1991-01-01

255

MRI spectrum of findings in lumbosacral epidural lipomatosis  

International Nuclear Information System (INIS)

Lumbosacral epidural lipomatosis (LEL) has been defined as a disease produced by excessive fat deposition within the spinal canal. In the pre MRI-era, this entity has been commonly overlooked. While a mild (or moderate) epidural fat hypertrophy is basically asymptomatic, severe LEL represents the symptomatic end-stage of this disease, conducing in many cases to surgical fat debulking. Since LEL may be concurrent with other substantial spinal abnormalities (e.g. disk herniation) MRI exams may increase our awareness of this condition to avoid its underestimation. MRI enables a reliable LEL characterization and may show its eventual reversibility in obese or corticosteroid receiving patients. This pictorial essay illustrates the usefulness of MRI to demonstrate the ongoing process of epidural fat accumulation in mild, moderate and severe LEL. The different morphologic patterns of the thecal sac produced by advanced LEL are analyzed. LEL and concurrent spinal disorders with superimposed neurological symptoms and signs are illustrated. (author)

256

MRI and SPECT findings in amyotrophic lateral sclerosis  

International Nuclear Information System (INIS)

MRI was performed in 21 patients and single photon emission computed tomography (SPECT) with N-isopropyl-p-123I iodoamphetamine in 16 patients, to visualize upper motor neurone lesions in amyotrophic lateral sclerosis. T2-weighted MRI revealed high signal along the course of the pyramidal tract in the internal capsule and cerebral peduncle in 4 of 21 patients. SPECT images were normal in 4 patients, but uptake was reduced in the cerebral cortex that includes the motor area in 11. (orig.)

257

Neurotuberculosis: Hallazgos intracraneanos en RM / Neurotuberculosis: Intracranial MRI findings  

Scientific Electronic Library Online (English)

Full Text Available SciELO Argentina | Language: Spanish Abstract in spanish Objetivos. Mostrar nuestra casuística de pacientes con diagnóstico de tuberculosis intracraneana y describir los diferentes tipos de lesiones documentadas en Resonancia Magnética (RM) que caracterizan a esta entidad. Materiales y Métodos. Para el presente trabajo fueron seleccionados, de forma retro [...] spectiva, 20 pacientes con hallazgos positivos de tuberculosis intracraneana. Doce eran de sexo masculino y 8 de sexo femenino, con un rango etario de 8 meses a 49 años de edad (edad media: 21 años). El diagnóstico clínico fue realizado con punción lumbar y cultivo de LCR. Once pacientes presentaron serología positiva para VIH. Las RM fueron realizadas en resonadores de 0.5T y 1.5T, complementadas en dos casos con Tomografía Computada (TC) de cerebro. A dos pacientes se les realizó difusión (DWI) y a un paciente espectroscopía. Resultados. Del total de pacientes (n=20), 14 presentaron compromiso subaracnoideo en la convexidad y 13 compromiso subaracnoideo cisternal basal (afectación leptomeníngea). En 13 se observaron tuberculomas y 11 presentaron angeítis de grandes vasos; mientras que 7 tuvieron angeítis de pequeños vasos, 7 hidrocefalia, 6 infartos parenquimatosos y 1 afectación paquimeníngea. Quince pacientes tenían lesiones combinadas. Conclusión. La localización más frecuente de neurotuberculosis en esta serie fue meníngea con compromiso leptomeníngeo (14 pacientes con afectación subaracnoidea, seguido de afectación cisternal en 13 pacientes) y sólo en un caso fue paquimeníngea. La manifestación parenquimatosa más frecuente fue el tuberculoma (granulomas tuberculosos) con 13 casos. De estos, 5 presentaron un patrón miliar y sólo uno comportamiento pseudotumoral. Abstract in english Purposes. To report our case series of patients with a diagnosis of intracranial tuberculosis and to describe the different types of lesions characterizing this entity on Magnetic Resonance Imaging (MRI). Materials and Methods. For the present study, we retrospectively selected 20 patients with posi [...] tive MRI findings of intracranial tuberculosis. Twelve of them were males and 8 were females, with an age range of between 8 months and 49 years (mean age: 21years). Clinical diagnosis was obtained by lumbar puncture and cerebrospinal fluid (CSF) culture. Eleven patients presented positive HIV serology. MRIs were performed using 0.5T and 1.5 T scanners and computed tomography (CT) of the brain was also performed in two patients. Diffusion-weighted technique was performed in two patients and spectroscopy in one patient. Results. Of the total patients studied (n=20), 14 presented convexity subarachnoid involvement and 13 subarachnoid basal cystern involvement (leptomeningeal involvement), 13 presented tuberculomas, 11 large-vessel angiitis, 7 smallvessel angiitis, 7 hydrocephalia, 6 parenchymatous infarction and one pachymeningeal involvement. Combined lesions were observed in 15 patients. Conclusion. The most frequent location of neurotuberculosis in this series was meningeal with leptomeningeal involvement (14 patients with subarachnoid involvement, followed by cysternal involvement in 13 patients), and only one patient had pachymeningeal involvement. The most frequent parenchymatous finding of tuberculosis was tuberculoma in 13 patients, 5 with a miliary pattern and only one with pseudo-tumoral behavior.

Jorge, Docampo; Carolina, Mariluis; Nadia, González; Carlos, Morales; Claudio, Bruno.

2012-06-01

258

Neurotuberculosis: Hallazgos intracraneanos en RM Neurotuberculosis: Intracranial MRI findings  

Directory of Open Access Journals (Sweden)

Full Text Available Objetivos. Mostrar nuestra casuística de pacientes con diagnóstico de tuberculosis intracraneana y describir los diferentes tipos de lesiones documentadas en Resonancia Magnética (RM que caracterizan a esta entidad. Materiales y Métodos. Para el presente trabajo fueron seleccionados, de forma retrospectiva, 20 pacientes con hallazgos positivos de tuberculosis intracraneana. Doce eran de sexo masculino y 8 de sexo femenino, con un rango etario de 8 meses a 49 años de edad (edad media: 21 años. El diagnóstico clínico fue realizado con punción lumbar y cultivo de LCR. Once pacientes presentaron serología positiva para VIH. Las RM fueron realizadas en resonadores de 0.5T y 1.5T, complementadas en dos casos con Tomografía Computada (TC de cerebro. A dos pacientes se les realizó difusión (DWI y a un paciente espectroscopía. Resultados. Del total de pacientes (n=20, 14 presentaron compromiso subaracnoideo en la convexidad y 13 compromiso subaracnoideo cisternal basal (afectación leptomeníngea. En 13 se observaron tuberculomas y 11 presentaron angeítis de grandes vasos; mientras que 7 tuvieron angeítis de pequeños vasos, 7 hidrocefalia, 6 infartos parenquimatosos y 1 afectación paquimeníngea. Quince pacientes tenían lesiones combinadas. Conclusión. La localización más frecuente de neurotuberculosis en esta serie fue meníngea con compromiso leptomeníngeo (14 pacientes con afectación subaracnoidea, seguido de afectación cisternal en 13 pacientes y sólo en un caso fue paquimeníngea. La manifestación parenquimatosa más frecuente fue el tuberculoma (granulomas tuberculosos con 13 casos. De estos, 5 presentaron un patrón miliar y sólo uno comportamiento pseudotumoral.Purposes. To report our case series of patients with a diagnosis of intracranial tuberculosis and to describe the different types of lesions characterizing this entity on Magnetic Resonance Imaging (MRI. Materials and Methods. For the present study, we retrospectively selected 20 patients with positive MRI findings of intracranial tuberculosis. Twelve of them were males and 8 were females, with an age range of between 8 months and 49 years (mean age: 21years. Clinical diagnosis was obtained by lumbar puncture and cerebrospinal fluid (CSF culture. Eleven patients presented positive HIV serology. MRIs were performed using 0.5T and 1.5 T scanners and computed tomography (CT of the brain was also performed in two patients. Diffusion-weighted technique was performed in two patients and spectroscopy in one patient. Results. Of the total patients studied (n=20, 14 presented convexity subarachnoid involvement and 13 subarachnoid basal cystern involvement (leptomeningeal involvement, 13 presented tuberculomas, 11 large-vessel angiitis, 7 smallvessel angiitis, 7 hydrocephalia, 6 parenchymatous infarction and one pachymeningeal involvement. Combined lesions were observed in 15 patients. Conclusion. The most frequent location of neurotuberculosis in this series was meningeal with leptomeningeal involvement (14 patients with subarachnoid involvement, followed by cysternal involvement in 13 patients, and only one patient had pachymeningeal involvement. The most frequent parenchymatous finding of tuberculosis was tuberculoma in 13 patients, 5 with a miliary pattern and only one with pseudo-tumoral behavior.

Jorge Docampo

2012-06-01

259

MRI findings of vascular dementia following hypertensive intracerebral hemorrhage  

International Nuclear Information System (INIS)

This study reviewed 23 patients with vascular dementia following hypertensive intracerebral hemorrhage. There were 12 male and 11 female patients with an age range between 46 and 88 years (median, 62.6 years). They consisted of 9 putaminal, 9 thalamic and 5 recurrent hemorrhages. Vascular dementia was diagnosed by Hasegawa's test for the demented patient. Patients with Hasegawa's score of less than 21.5 were enrolled as dementia. A superconducting magnet MIR system (MRT-50A, 0.5 Tesla) was used. The highest incidence of finding depicted by MRI was cortical atrophy (100%), followed by periventricular high intensity zone (91.3%), periventricular of deep white matter patchy-like high intensity area (73.9%), hydrocephalus and multiple putaminal low intensity spots (52.1%), scattered cortical high intensity area (47.8%) and subdural ring-like high intensity zone (21.7%). Older group of more than 71 years had more frequent multiple putaminal low intensity spots, scattered cortical high intensity area, and relatively frequent hydrocephalus, periventricular high intensity zone, as compared with younger group of less than 69 years. Subdural ring-like high intensity zone was frequently observed in patients with an interval from onset of more than 2 years. Multiple putaminal low intensity spots were frequently seen in patients with less than 1 year's interval. Multiple putaminal low intensity spots and periventricular high intensity zone were more frequently observed in patients were more frequently observed in patients with thalamic and recurrent hemorrhages, periventricular or deep white matter patchy-like high intensity areas were seen more frequently in patients with putaminal hemorrhage. Both scattered cortical high intensity area and subdural ring-like high intensity zone were more frequently observed in patients with recurrent hemorrhages. Both hydrocephalus and multiple putaminal low intensity spots were more common in demented patients than predemented patients. (J.P.N.)

260

Cine Club  

CERN Multimedia

Thursday 22 August 2013 at 20:00 CERN Council Chamber The Angels’ Share Directed by Ken Loach (UK, 2012) Original version English; french subtitles; 101 minute This bitter sweet comedy follows protagonist Robbie as he sneaks into the maternity hospital to visit his young girlfriend Leonie and hold his newborn son Luke for the first time. Overwhelmed by the moment, he swears that Luke will not have the same tragic life he has had. Escaping a prison sentence by the skin of his teeth, he's given one last chance...While serving a community service order, he meets Rhino, Albert and Mo who, like him, find it impossible to find work because of their criminal records. Little did Robbie imagine how turning to drink might change their lives - not cheap fortified wine, but the best malt whiskies in the world. Will it be 'slopping out' for the next twenty years, or a new future with 'Uisge Beatha' the 'Water of Life?' Only the angels know.... Th...

Ciné Club

2013-01-01

 
 
 
 
261

CINE CLUB  

CERN Multimedia

Thursday 7 October 2010 at 20:30 Jeudi 7 Octobre 2010 à 20:30 CERN Main Auditorium Amphithéâtre Principal Mystic River   By/de : Clint Eastwood (USA, 2003) 132 min With/avec : Sean Penn, Tim Robbins, Kevin Bacon, Laurence Fishburne, Marcia Gay Harden, Laura Linney   During a summer in 1975, Dave Boyle and two friends, Jimmy and Sean, are playing on a sidewalk in Boston when Dave is abducted by two men and subjected to sexual abuse over a period of several days. Eventually escaping, but haunted into adulthood by his trauma, Dave becomes a primary suspect when Jimmy's daughter, Katie, is found murdered. Sean, assigned to investigate the crime, finds himself facing both demons from the past and demons in the present as the circumstances surrounding Katie's death are uncovered.   Original version english with english subtitles Version originale anglaise soutitrée en anglais * * * * * * * Thursday 14 October 2010 at 20:30 ...

CINE CLUB

2010-01-01

262

CINE CLUB  

CERN Multimedia

Thursday 11 November 2010 at 20:30 / Jeudi 11 Novembre 2010 à 20:30 CERN Main Auditorium / Amphithéâtre Principal LE CHOCOLAT By/de : Lasse Hallström (UK/USA, 2000) 121 min With/avec: Lena Olin, Juliette Binoche, Johny Depp, Judi Dench, Alfred Molina, Peter Stormare, Leslie Caron, Carrie-Anne Moss   Vianne Rocher and her young daughter are drifters who are met with skepticism and resistance when they move to a conservative town in rural France and open a chocolate shop during Lent. As Vianne begins to work her magic and help those around her, the townspeople are soon won over by her exuberance and her delicious chocolates - except for the mayor, who is determined to shut her down. When a group of river drifters visit the town, Vianne teaches the townspeople something about acceptance, and finds love for herself along the way. Original version english / french with german subtitles Version originale anglaise / française soutitr&...

CINE CLUB

2010-01-01

263

MRI findings in spinal subdural and epidural hematomas  

Energy Technology Data Exchange (ETDEWEB)

Background: Spinal hematomas are rare entities that can be the cause of an acute spinal cord compression syndrome. Therefore, an early diagnosis is of great importance. Patients and Methods: From 2001 to 2005 seven patients with intense back pain and/or acute progressive neurological deficit were studied via 1.5 T MRI (in axial and sagittal T1- and T2-weighted sequences). Follow-up MRI was obtained in six patients. Results: Four patients showed the MRI features of a hyperacute spinal hematoma (two spinal subdural hematoma [SSH] and two spinal epidural hematoma [SEH]), isointense to the spinal cord on T1- and hyperintense on T2-weighted sequences. One patient had an early subacute SEH manifest as heterogeneous signal intensity with areas of high signal intensity on T1- and T2-weighted images. Another patient had a late subacute SSH with high signal intensity on T1- and T2-weighted sequences. The final patient had a SEH in the late chronic phase being hypointense on T1- and T2-weighted sequences. Discussion: MRI is valuable in diagnosing the presence, location and extent of spinal hematomas. Hyperacute spinal hematoma and the differentiation between SSH and SEH are particular diagnostic challenges. In addition, MRI is an important tool in the follow-up in patients with conservative treatment.

Braun, Petra [Department of Radiology, Hospital La Plana, Ctra. De Vila-real a Borriana km. 0.5, 12540 Vila-real (Castello) (Spain)], E-mail: PetraBraun@gmx.de; Kazmi, Khuram [Department of Radiology, Penn State Milton S. Hershey Medical Center, 500 University Drive, Hershey, PA 17033 (United States); Nogues-Melendez, Pablo; Mas-Estelles, Fernando; Aparici-Robles, Fernando [Department of Radiology, La Fe Hospital, Avenida Campanar, 21, 46009 Valencia (Spain)

2007-10-15

264

MRI findings in spinal subdural and epidural hematomas  

International Nuclear Information System (INIS)

Background: Spinal hematomas are rare entities that can be the cause of an acute spinal cord compression syndrome. Therefore, an early diagnosis is of great importance. Patients and Methods: From 2001 to 2005 seven patients with intense back pain and/or acute progressive neurological deficit were studied via 1.5 T MRI (in axial and sagittal T1- and T2-weighted sequences). Follow-up MRI was obtained in six patients. Results: Four patients showed the MRI features of a hyperacute spinal hematoma (two spinal subdural hematoma [SSH] and two spinal epidural hematoma [SEH]), isointense to the spinal cord on T1- and hyperintense on T2-weighted sequences. One patient had an early subacute SEH manifest as heterogeneous signal intensity with areas of high signal intensity on T1- and T2-weighted images. Another patient had a late subacute SSH with high signal intensity on T1- and T2-weighted sequences. The final patient had a SEH in the late chronic phase being hypointense on T1- and T2-weighted sequences. Discussion: MRI is valuable in diagnosing the presence, location and extent of spinal hematomas. Hyperacute spinal hematoma and the differentiation between SSH and SEH are particular diagnostic challenges. In addition, MRI is an important tool in the follow-up in patients with conservative treatment

265

MRI of articular cartilaginous lesions. MRI findings in osteoarthritis of the knee joint  

International Nuclear Information System (INIS)

An investigation was carried out to assess the usefulness of magnetic resonance imaging for imaging of the knee joint, especially for detecting articular cartilaginous lesions associated with osteoarthritis of the knee. A total of 141 patients with osteoarthritis were examined (23 males, 118 females). Their age range was 40-93 (mean age 66.2). Using radiotherapy examinations, patients were classified according to Hokkaido University Classification Criteria; 22, 49, 46, 16, and 8 patients were classified as Type I, II, III, IV and V, respectively. Articular cartilage defects were examined using MRI, and the number of such defects increased as the X-ray stage progressed. The appearance of a low signal intensity area in the bone marrow was examined using MRI, and the number of patients observed to have such areas increased as the x-ray stages progressed. JOA OA scores were significantly low for patients with meniscal tears. Patients were classified and results reviewed using MRI examinations. Classification by MRI of articular cartilage lesions correlated with the JOA OA scores. Low signal intensity areas in the bone marrow were frequently observed in advanced osteoarthritis cases, and there was correlation between FTA and MRI classifications of these areas. MRI is extremely valuable in detecting articular cartilage lesions in the knee joint, showing those lesions which cannot be detected by conventional radiography examinations. Thus, MRI is judged to be a clinically us Thus, MRI is judged to be a clinically useful method for diagnosis of osteoarthritis. (author)

266

CT and MRI findings of calcified spinal meningiomas: correlation with pathological findings  

International Nuclear Information System (INIS)

This study was designed to present characteristic CT and MR findings of calcified spinal meningiomas that correlate with pathological findings and to assess the efficacy of CT for the detection of calcifications within a mass in comparison to MRI. Between 1998 and 2009, 10 out of 11 patients who had pathologically confirmed psammomatous meningiomas showed gross calcifications on CT images and were included in this study. On CT scans of the 10 patients, the distribution pattern, morphology and number of calcifications within masses were evaluated. MRI was performed in seven patients and signal intensities of masses were assessed. The pathological results analyzed semi-quantitatively were compared with the density or the size of calcifications within a mass as seen on a CT scan. Seven of 10 masses were located at the thoracic spine level. Eight masses had intradural locations. The other two masses had extradural locations. Four masses were completely calcified based on standard radiographs and CT. Symptoms duration, the size of the mass and size or number of calcifications within a mass had no correlation. The location, size, and distribution pattern of calcifications within masses were variable. On MR images, signal intensity of calcified tumor varied on all imaging sequences. All the masses enhanced after injection of intravenous contrast material. A calcified meningioma should be first suggested when extradural or intradural masses located in the spine contain calcifmasses located in the spine contain calcifications regardless of the size or pattern as depicted on CT, especially in the presence of enhancement as seen on MR images. (orig.)

267

Correlation of MRI findings with clinical findings of trochanteric pain syndrome  

Energy Technology Data Exchange (ETDEWEB)

Greater trochanter pain syndrome due to tendinopathy or bursitis is a common cause of hip pain. The previously reported magnetic resonance (MR) findings of trochanteric tendinopathy and bursitis are peritrochanteric fluid and abductor tendon abnormality. We have often noted peritrochanteric high T2 signal in patients without trochanteric symptoms. The purpose of this study was to determine whether the MR findings of peritrochanteric fluid or hip abductor tendon pathology correlate with trochanteric pain. We retrospectively reviewed 131 consecutive MR examinations of the pelvis (256 hips) for T2 peritrochanteric signal and abductor tendon abnormalities without knowledge of the clinical symptoms. Any T2 peritrochanteric abnormality was characterized by size as tiny, small, medium, or large; by morphology as feathery, crescentic, or round; and by location as bursal or intratendinous. The clinical symptoms of hip pain and trochanteric pain were compared to the MR findings on coronal, sagittal, and axial T2 sequences using chi-square or Fisher's exact test with significance assigned as p<0.05. Clinical symptoms of trochanteric pain syndrome were present in only 16 of the 256 hips. All 16 hips with trochanteric pain and 212 (88%) of 240 without trochanteric pain had peritrochanteric abnormalities (p=0.15). Eighty-eight percent of hips with trochanteric symptoms had gluteus tendinopathy while 50% of those without symptoms had such findings (p=0.004). Other than tendinopathy, there was no statistically significant difference between hips with or without trochanteric symptoms and the presence of peritrochanteric T2 abnormality, its size or shape, and the presence of gluteus medius or minimus partial thickness tears. Patients with trochanteric pain syndrome always have peritrochanteric T2 abnormalities and are significantly more likely to have abductor tendinopathy on magnetic resonance imaging (MRI). However, although the absence of peritrochanteric T2 MR abnormalities makes trochanteric pain syndrome unlikely, detection of these abnormalities on MRI is a poor predictor of trochanteric pain syndrome as these findings are present in a high percentage of patients without trochanteric pain. (orig.)

Blankenbaker, Donna G.; Ullrick, Steven R.; Davis, Kirkland W.; De Smet, Arthur A. [University of Wisconsin School of Medicine and Public Health, Department of Radiology, Madison, WI (United States); Haaland, Ben; Fine, Jason P. [University of Wisconsin School of Medicine and Public Health, Departments of Biostatistics and Medical Informatics and Statistics, Madison, WI (United States)

2008-10-15

268

Cine Club  

CERN Multimedia

Wednesday 29 June 2011 at 20:30 CERN Council Chamber Arizona Dream  By/de : Emir Kusturica (USA/France, 1993) 142 min With/avec: Johnny Depp, Jerry Lewis, Fay Dunaway, Lily Taylor, Vincent Gallo A romantic comedy about the adventures of an innocent dreamer in the weird and colourful landscape of the American West. Caught between childhood and adulthood he finds himself back in his hometown where he becomes involved with a wealthy widow and her stepdaughter. Original version english; english subtitles Entrance : 2 CHF Projection from DVD http://cineclub.web.cern.ch/Cineclub/     Thursday 7 July 2011 at 20:30 CERN Council Chamber Burn After Reading  By/de : Ethan Coen and Joel Coen (USA/UK/France, 2008) 102 min With/avec: George Clooney, Frances McDormand, Brad Pitt, John Malkovich, Tilda Swinton Osbourne Cox, a Balkan expert, is fired at the CIA, so he begins a memoir. His wife wants a divorce and expects her lover, Harry, a philandering State Dep...

Ciné Club

2011-01-01

269

Cine club  

CERN Multimedia

Thursday 23 October 2014 at 20:00 CERN Council Chamber The Shop on Main Street Directed by Jan Kadar, Elmar Klos Slovakia, 1965, 125 minutes   In 1942, in a small town in Czechoslovakia, the poor carpenter Tony Brtko is assigned "Aryanizator" of a small shop on the main street by his fascist brother-in-law. His greedy wife is seduced with the promise of fortune, but Tony finds that the store owned by the deaf and senile seventy eight year-old widow Rozalie Lautmann is bankrupted and the old lady is financially supported by the Jewish community that promises a salary to him to help her. Tony befriends Mrs Lautmann and helps her in the store and repairs her furniture, and lures his wife with his salary. When the Jews are expelled from the town by the fascists, Tony decides to help the old lady. Original version Slovak; English subtitles   Thursday 30 October 2014 at 20:00 CERN Council Chamber High Noon Directed by Fred Zinnemann USA, 1952, 85 minutes On the ...

Ciné club

2014-01-01

270

MRI findings of the knee in rheumatoid arthritis  

Energy Technology Data Exchange (ETDEWEB)

The studies were done to know in what extent MRI can image the pannus invasion and cysts in the subcartilagious tissues which are not revealed by the scout roentgenogram and how the synovial membrane can be enhanced by gadolinium-DTPA (Gd-DTPA). Twenty five knees in rheumatoid arthritis of 21 patients, mean age of 57.8 years, were subjected to the studies. Thirteen knees were in Larsen grade 0, 3 in grade I, 4 in grade II, 2 in grade III and 3 in grade IV, whose osteolytic degree were small. MRI system was 0.5 Tesla superconducting Toshiba MRT50A. Imaging was performed by the field echo method with 4 mm-thick slice of T1, T2 weighted images of sagittal and frontal sections, and 5 min after intravenous injection of Gd-DTPA, of T1 weighted images of frontal and sagittal sections. Subcartilagious cysts not detectable on the scout roentgenogram were found in 13 knees (52%) on the MRI image. MRI after Gd-DTPA gave the enhanced images of surroundings of joint capsule in 15 cases, of dotted or reticular synovial membrane in 2 and of joint capsule surroundings with dotted membrane in 2. One case showed no enhancement. MRI was thus found useful for detection of cysts and pannus in the early knee rheumatoid arthritis with insignificant osteolysis. MRI after Gd-DTPA enhanced the surroundings of joint capsule in most cases, and in some cases, the synovial membrane in a dotted or reticular manner, which was considered to show the dilated blood vessels or necrotic coagulations of synovial villi. (H.O.)

Kanno, Hiromasa; Yuasa, Shoichi; Choukan, Toshinori; Oonuma, Shinichi; Matsunaga, Toshiki [Jusendo General Hospital, Koriyama, Fukushima (Japan)

1996-03-01

271

MRI findings with periventricular leukomalacia. Correlation with neurological development  

International Nuclear Information System (INIS)

In 22 infants with PVL, who were born at 35 weeks gestational age or less, correlation between severity of white matter lesions on MRI and developmental quotient (DQ) of infants was studied. MRI was obtained later than 7 months of age and the severity of white matter lesions was classified as follows: Group I: periventricular white matter is focally affected (n=7), Group II: periventricular white matter is diffusely affected (n=10), and Group III: subcortical white matter is also affected (n=5). Perinatal characteristics including gestational weeks, birth weight, Apgar score, procedure of delivery, and duration of mechanical ventilation revealed no significant differences between the groups. Seventeen infants developed cerebral palsy, while the other 5 infants (4 in Group I, 1 in Group II) showed normal development at 1 year of age, MRI of 4 among these 5 infants only revealed unilateral cysts around the anterior horn of lateral ventricles. Enjoji developmental test showed significant differences in gross motor DQ between Group I and III at both 1 and 2 corrected ages. Although more quantitative criteria will be required for precise classification, it is suggested that the severity of the white matter lesions on MRI is well correlated with gross motor development in PVL. (author)

272

Transient neonatal hypoglycemia: cranial US and MRI findings  

Energy Technology Data Exchange (ETDEWEB)

A case of transient neonatal hypoglycemia with patchy hyperechogenic white matter abnormalities in the frontal and parietooccipital lobes on cranial US is presented. An MRI examination revealed T1 and T2 shortening of the lesions in the occipital and frontal white matter. Follow-up cranial US demonstrated recovery of white matter changes in the patient with normal neurological outcome. (orig.)

Cakmakci, H.; Usal, C.; Karabay, N.; Kovanlikaya, A. [Dept. of Radiology, Dokuz Eyluel Univ., Izmir (Turkey)

2001-12-01

273

Dobutamine cine magnetic resonance imaging after myocardial infarction; Cine Risonanza Magnetica con dobutamina dopo infarto del miocardio  

Energy Technology Data Exchange (ETDEWEB)

Dobutamine Cine MRI is a new diagnostic imaging technique in the pretreatment (revascularization) assessment of myocardial infarction patients. In this issue are reported the result of a comparative study of the diagnostic yield of dobutamine Cine MRI with that of stress echocardiography in the assessment of viable myocardium. A new method for analysis of Cine MR images, employing digital subtraction, aimed at decreasing subjectivity in the quantitative assessment of myocardial wall thickening. Twenty-six patients (21 men and 5 women) with a history of myocardial infarction who were scheduled for revascularization were submitted to stress echocardiography and dobutamine Cine MRI to evaluate contractile recovery of the segments considered akinetic or hypo kinetic at baseline echocardiography. Dobutamine was administered in growing doses (5, 10, 15{gamma}/kg/min). 16 segments of the left ventricle in each patient were considered. In the 416 segments studied, it was found that 307 normo kinetic, 64 scarred and 45 viable segments with stress echocardiography, versus 302 normo kinetic, 83 scarred and 31 viable segments with dobutamine MRI. Three months after revascularization 15 patients were examined to check contractile recovery of the segments considered as viable. Echocardiography had 79% sensitivity and 97% specificity, while Cine MRI had 96% and 86%, respectively. In patients with anteroseptal wall myocardial infarction stress echocardiography had 75% sensitivity and 97% specificity. Echocardiography permits to distinguish viable myocardium and scarred myocardial tissue with good sensitivity and specificity, but Cine MRI performs better. Cine MRI has much higher sensitivity than stress echocardiography and thus makes the technique of choice to evaluate viable myocardium in these sites. The digital subtraction technique is as accurate as manual measurements, but reduces the error rate and permits quicker evaluation, particularly in subendocardial thickening. [Italian] La cine Risonanza Magnetica (cine RM) con stimolo farmacologico {beta}-adrenergico (stress dobutamina) rappresenta una nuova indagine diagnostica nella valuazione pretrattamento di rivascolarizzazione del paziente con infarto del miocardio. Scopo dello studio e' quello di verificare la validita' diagnostica della cine RM con stimolo farmacologico in confronto con l'ecocardiografia con stimolo farmacologico nella valutazione della vitalita' del miocardio e di proporre un nuovo metodo d'analisi delle immagini di cine RM mediante la sottrazione elettronica d'immagine al fine di ridurre gli elementi soggettivi nella valutazione quantitativa dell'ispessimento parietale. Ventisei pazienti (21 maschi, 5 femmine) con pregresso infarto del miocardio in attesa di intervento di rivascolarizzazione sono stati sottoposti a ecocardiografia con stimolo farmacologico mediante dobutamina e a esame cine RM con dobutamina al fine di verificare la ripresa contrattile dei segmenti giudicati acinetici o ipocinetici all'esame ecocardiografico di base. E' stata infusa dobutamina a dosi crescenti (5, 10, 15{gamma}/kg/min). Per ogni paziente sono stati considerati 16 segmenti del ventricolo sinistro. Nel totale di 416 segmenti miocardici considerati l'analisi qualitativa del movimento parietale con ecocardiografia con dobutamina ha dimostrato 307 segmenti normocinetici, 64 cicatriziali e 45 vitali mentre con la cine Rm sono stati osservati rispettivamente 302 segmenti come normocinetici, 83 cicatriziali e 31 vitali. Tre mesi dopo l'intervento di rivascolarizzazione 15 pazienti sono stati rivalutati per verificare la ripresa contrattile dei segmenti giudicati vitali. L'esame ecocardiografico ha mostrato sensibilita' del 79% e specificita' del 97% mentre per l'analisi qualitativa mediante cine RM la sensibilita' e' stata del 96% e la specificita' dell'86%. Nei pazienti con infarto anterosettale l'ecocardiografia con dobutamina ha dimostrato sensibilita' e specificita' rispetti

Giovagnoni, A.; Ligabue, G.; Romagnoli, R. [Modena Univ., Modena (Italy). Scienze Radiologiche, Dipt. di Medicina Interna; Reggio Emilia Univ., Reggio Emilia (Italy). Cattedra di Cardiologia; Rossi, R.; Muia, N.; Modena, M.G. [Modena Univ., Modena (Italy). Dipt. di Scienze Mediche, Oncologiche e Radiologiche; Reggio Emilia Univ. (Italy). Dipt. di Scienze Mediche, Oncologiche e Radiologiche

1999-12-01

274

Diffusion-weighted imaging findings on MRI as the sole radiographic findings in a child with proven herpes simplex encephalitis  

International Nuclear Information System (INIS)

We present a case of herpes simplex encephalitis in an 8-year-old girl, in whom hyperintensity was detected on diffusion-weighted imaging (DWI) while conventional MRI sequences were normal 1 week after the onset of neurological symptoms. This case is rare in that a child beyond the neonatal period with focal herpes simplex encephalitis had an abnormal DWI sequence as the only MRI finding. (orig.)

275

Spinal cord and cauda equina MRI findings in metachromatic leukodystrophy: case report  

International Nuclear Information System (INIS)

Metachromatic leukodystrophy (MLD) is an autosomal recessive disease with well-documented intracranial findings on neuroimaging both by computed tomography (CT) and MRI. We describe the first case of late infantile MLD with spinal involvement revealed by MRI as marked contrast enhancement of nerve roots at the level of the cauda equina. (orig.)

276

Spinal cord and cauda equina MRI findings in metachromatic leukodystrophy: case report  

Energy Technology Data Exchange (ETDEWEB)

Metachromatic leukodystrophy (MLD) is an autosomal recessive disease with well-documented intracranial findings on neuroimaging both by computed tomography (CT) and MRI. We describe the first case of late infantile MLD with spinal involvement revealed by MRI as marked contrast enhancement of nerve roots at the level of the cauda equina. (orig.)

Toldo, Irene; Battistella, Pier Antonio; Laverda, Anna Maria [University of Padua, Department of Pediatrics, Padua (Italy); Carollo, Carla [Institute of Neuroradiology, Padua (Italy)

2005-08-01

277

A prospective study on MRI findings and prognostic factors in athletes with MTSS.  

Science.gov (United States)

In medial tibial stress syndrome (MTSS) bone marrow and periosteal edema of the tibia on the magnetic resonance imaging (MRI) is frequently reported. The relationship between these MRI findings and recovery has not been previously studied. This prospective study describes MRI findings of 52 athletes with MTSS. Baseline characteristics were recorded and recovery was related to these parameters and MRI findings to examine for prognostic factors. Results showed that 43.5% of the symptomatic legs showed bone marrow or periosteal edema. Absence of periosteal and bone marrow edema on MRI was associated with longer recovery (P?=?0.033 and P?=?0.013). A clinical scoring system for sports activity (SARS score) was significantly higher in the presence of bone marrow edema (P?=?0.027). When clinical scoring systems (SARS score and the Lower Extremity Functional Scale) were combined in a model, time to recovery could be predicted substantially (explaining 54% of variance, P?=?0.006). In conclusion, in athletes with MTSS, bone marrow or periosteal edema is seen on MRI in 43,5% of the symptomatic legs. Furthermore, periosteal and bone marrow edema on MRI and clinical scoring systems are prognostic factors. Future studies should focus on MRI findings in symptomatic MTSS and compare these with a matched control group. PMID:22515327

Moen, M H; Schmikli, S L; Weir, A; Steeneken, V; Stapper, G; de Slegte, R; Tol, J L; Backx, F J G

2014-02-01

278

Liver involvement in HELLP syndrome: CT and MRI findings in two patients  

International Nuclear Information System (INIS)

This report features the CT and MRI findings in two patients with HELLP syndrome, upper abdominal pain, and severe liver cell dysfunction. Despite the extensive hepatic abnormalities seen on CT and MRI studies, both patients recovered fully after delivery. The role of imaging studies for diagnosis and treatment planning in the clinical setting of HELLP syndrome is discussed. (orig.)

279

Liver involvement in HELLP syndrome: CT and MRI findings in two patients  

Energy Technology Data Exchange (ETDEWEB)

This report features the CT and MRI findings in two patients with HELLP syndrome, upper abdominal pain, and severe liver cell dysfunction. Despite the extensive hepatic abnormalities seen on CT and MRI studies, both patients recovered fully after delivery. The role of imaging studies for diagnosis and treatment planning in the clinical setting of HELLP syndrome is discussed. (orig.)

Hoe, L. van [Dept. of Radiology, University Hospitals, Leuven (Belgium); Amant, F. [Dept. of Gynecology and Obstetrics, University Hospitals, Leuven (Belgium); Gryspeerdt, S. [Dept. of Radiology, University Hospitals, Leuven (Belgium); Marchal, G. [Dept. of Radiology, University Hospitals, Leuven (Belgium); Verhaeghe, J. [Dept. of Gynecology and Obstetrics, University Hospitals, Leuven (Belgium); Baert, A. [Dept. of Radiology, University Hospitals, Leuven (Belgium)

1995-11-01

280

Can pathoanatomical pathways of degeneration in lumbar motion segments be identified by clustering MRI findings  

DEFF Research Database (Denmark)

Magnetic Resonance Imaging (MRI) is the gold standard for detailed visualisation of spinal pathological and degenerative processes, but the prevailing view is that such imaging findings have little or no clinical relevance for low back pain. This is because these findings appear to have little association with treatment effects in clinical populations, and mostly a weak association with the presence of pain in the general population.However, almost all research into these associations is based on the examination of individual MRI findings, despite its being very common for multiple MRI findings to coexist. Therefore, this proof-of-concept study investigated the capacity of a multivariable statistical method to identify clusters of MRI findings and for those clusters to be grouped into pathways of vertebral degeneration.

Jensen, Rikke Krüger; Jensen, Tue S

2013-01-01

 
 
 
 
281

MRI and CT findings of adult Down's syndrome  

International Nuclear Information System (INIS)

Cranial CT and MRI were performed in 29 adult patients with Down's syndrome aged from 20 to 46 years to examine early aging. Morphological changes with aging, such as brain atrophy and ventricular enlargement, were generally sparse; however, calculi of the basal nucleus and lesions of deep-seated white matter were significantly increased with aging. The pallidum and putamen were shown as low intensity signals on T2-weighted images in many of patients in their fourties, suggesting their involvement in the occurrence of dyskinesia and parkinsonism symptoms that are likely to occur in the elderly. Localized changes, as shown on CT and MRI, may reflect abnormally early occurrence of aging, which precedes morphological changes such as brain atrophy. (N.K.)

282

The MRI findings of a de Garengeot hernia.  

LENUS (Irish Health Repository)

The presence of the appendix within a femoral hernia is rare. It was first described by the French surgeon Jacques Croissant de Garengeot in 1731. This phenomenon accounts for 0.8-1% of all femoral hernias. Acute appendicitis occurring within a femoral hernia is even rarer and is difficult to diagnose pre-operatively. This type of hernia is termed a de Garengeot hernia. The ultrasonographic and CT imaging features of de Garengeot hernias have been described previously. We report a case of a 57-year-old female who presented with a painful right-sided groin mass. She underwent MRI of the inguinal region, which successfully diagnosed this rare hernia pre-operatively. To our knowledge, this is the first description of a de Garengeot hernia diagnosed using MRI.

Halpenny, D

2012-03-01

283

A case of subacute combined degeneration: MRI findings  

Energy Technology Data Exchange (ETDEWEB)

The specific spinal cord lesion caused by vitamin B12 deficiency is known as subacute combined degeneration (SCD). Neuropathological studies of SCD show lesions mainly in the posterior and lateral columns, involving the cortico-spinal and spino-cerebellar tracts. We report a case of SCD in a 19-year-old man who presented with 4 weeks history of gradually progressing tingling in both hands. MRI of the cervical spine demonstrated symmetrical areas of T2 signal abnormality involving the dorsal columns of the cervical cord from the C2 through C5 levels associated with spinal cord expansion. He was treated with vitamin B12 supplements and experienced gradual improvement in his clinical symptoms. Repeat MRI of the cervical spine after 2 months revealed slight decrease in the area of abnormal signal. (orig.) With 1 fig., 11 refs.

Yamada, K. [Department of Diagnostic Radiology, University of Rochester Medical Center, Rochester, NY (United States)]|[NMR Center, Massachusetts General Hospital, Charlestown, MA (United States); Shrier, D.A.; Tanaka, H.; Numaguchi, Y. [Department of Diagnostic Radiology, University of Rochester Medical Center, Rochester, NY (United States)

1998-06-01

284

Association between pathological and MRI findings in multiple sclerosis.  

Science.gov (United States)

The identification of pathological processes that could be targeted by therapeutic interventions is a major goal of research into multiple sclerosis (MS). Pathological assessment is the gold standard for such identification, but has intrinsic limitations owing to the limited availability of autopsy and biopsy tissue. MRI has gained a leading role in the assessment of MS because it allows doctors to obtain an ante mortem picture of the degree of CNS involvement. A number of correlative pathological and MRI studies have helped to define in vivo the pathological substrates of MS in focal lesions and normal-appearing white matter, not only in the brain, but also in the spinal cord. These studies have resulted in the identification of aspects of pathophysiology that were previously neglected, including grey matter involvement and vascular pathology. Despite these important achievements, numerous open questions still need to be addressed to resolve controversies about how the pathology of MS results in fixed neurological disability. PMID:22441196

Filippi, Massimo; Rocca, Maria A; Barkhof, Frederik; Brück, Wolfgang; Chen, Jacqueline T; Comi, Giancarlo; DeLuca, Gabriele; De Stefano, Nicola; Erickson, Bradley J; Evangelou, Nikos; Fazekas, Franz; Geurts, Jeroen J G; Lucchinetti, Claudia; Miller, David H; Pelletier, Daniel; Popescu, Bogdan F Gh; Lassmann, Hans

2012-04-01

285

UCSF study finds breast MRI helps predict chemotherapy's effectiveness  

Science.gov (United States)

Magnetic resonance imaging (MRI) provides an indication of a breast tumor's response to pre-surgical chemotherapy significantly earlier than possible through clinical examination, according to a new study published online in the journal Radiology. Women with breast cancer often undergo chemotherapy prior to surgery. Research has shown that women who receive this treatment, known as neoadjuvant chemotherapy, are more likely to achieve breast conservation than those receiving chemotherapy after surgery.

286

Bilateral Renal Lymphangiomatosis: Ultrasound, CT, and MRI Findings  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Background/Objective: Renal lymphangiomatosis (RL) is a rare disorder characterized by developmental malformation of the lymphatic system surrounding the kidneys. Herein we describe the ultrasound, CT scan, and MRI features of renal lymphangiomatosis in an asymptomatic male patient."nCase Presentation: A 21 years-old man underwent abdominal ultrasound due to 1 month history of dyspepsia and epigastric pain which revealed mild enlargement of both kidneys (right: accompanied by increased r...

Bagheri, M. H.; Zare, Z.; Sefidbakht, S.; Nabavizadeh, S. A.; Roozbeh, J.; Salehipour, M.

2008-01-01

287

Ultrasound and MRI findings in appendicular and truncal fat necrosis  

International Nuclear Information System (INIS)

The objective was to evaluate ultrasound and MRI in clinical appendicular and truncal fat necrosis. Thirty-three patients (14 men, 19 women, median age 55, range 29-95) were retrospectively evaluated. Histologically, three groups were seen: Group 1 (n = 18) consisted of patients with subcutaneous masses with septal and extrinsic oedema; in Group 2 (n = 11) necrosis occurred within lipomatous tumours and little oedema; and in Group 3 (n = 4) there were large complex masses consistent with Morel-Lavallee lesions. Two experienced radiologists reviewed MR (n = 30) and ultrasound (n = 32) images with consensus agreement. MRI was performed on a 1.5T system with T1-weighted, T2-weighted fat-suppressed and T1-weighted fat-suppressed post-intravenous gadolinium sequences obtained in two orthogonal planes. Ultrasound (linear 5- to 13.5-MHz probe) was performed in the longitudinal and short axis. Anatomical position, size, shape (oval, linear, ill-defined), internal architecture (lobules, septi or stranding), intrinsic signal characteristics, presence of surrounding pseudocapsule, extrinsic linear stranding and vascularity (gadolinium enhancement or power Doppler) were recorded. Anatomical locations were buttock/thigh (n = 17), leg (n = 6), upper limb (n = 5) and thoracic/abdominal wall (n = 5) with the majority of lesions (30 out of 33) oval/linear in shape. On ultrasound and MRI most lesions showed internal fat lobules, intervening septi and a surrounding pseudocapsule. Fat neti and a surrounding pseudocapsule. Fat necrosis can usually be identified as containing multiple fat lobules on ultrasound and MRI despite a varying degree of inflammatory change surrounding and within the mass. (orig.)

288

Wildervanck or cervico-oculo-acoustic syndrome and MRI findings.  

Digital Repository Infrastructure Vision for European Research (DRIVER)

In 1952, Wildervanck described the first case of what he styled the cervico-oculo-acoustic (COA) syndrome. This comprises Klippel Feil's (KF) anomaly (congenitally fused cervical vertebrae), congenital sensorineural deafness and Duane's retraction syndrome (deficient abduction with retraction on adduction). Since that original paper, there have been further reports describing this triad, either completely or incompletely. A further case of this syndrome is reported and the first report of MRI...

Hughes, P. J.; Davies, P. T.; Roche, S. W.; Matthews, T. D.; Lane, R. J.

1991-01-01

289

MRI findings in the patients with the presumptive clinical diagnosis of Tolosa-Hunt syndrome  

Energy Technology Data Exchange (ETDEWEB)

The aim of this study was to present our experience in MRI diagnosis of 23 patients with the clinical findings suggesting Tolosa-Hunt syndrome (THS). Cranial MRI studies of the patients with a clinical history of at least one episode of unilateral or bilateral orbital and periorbital pain, and associated paresis of one or more of third to sixth cranial nerves, were performed on a 1.5-T MRI scanner. Whereas 5 patients had the diagnosis of THS, paracavernous meningiomas in 4 patients, pituitary macroadenomas with cavernous sinus infiltration in 3 patients, Meckel's cave neurinoma in 1 patient, and suprasellar epidermoid in 1 patient were surgically proven MRI findings. Other pathological MRI findings were leptomeningeal metastases in 3 patients, granulomatous pachymeningitis sequelae in 2 patients, and aneurysm with compression on cavernous sinus in 1 patient. Three patients had normal MRI findings. The incidence of radiologically proven diagnosis of THS among the patients with the clinical findings suggesting THS seemed to be low in our study. In conclusion, MRI is the most valuable imaging technique to distinguish THS from other THS-like entities, and permits a precise assessment, management, and therapeutic planning of the underlying pathological conditions. (orig.)

Cakirer, Sinan [Department of Radiology, Neuroradiology Section, Istanbul Sisli Etfal Hospital, 81120 Istanbul (Turkey)

2003-01-01

290

MRI findings in the patients with the presumptive clinical diagnosis of Tolosa-Hunt syndrome  

International Nuclear Information System (INIS)

The aim of this study was to present our experience in MRI diagnosis of 23 patients with the clinical findings suggesting Tolosa-Hunt syndrome (THS). Cranial MRI studies of the patients with a clinical history of at least one episode of unilateral or bilateral orbital and periorbital pain, and associated paresis of one or more of third to sixth cranial nerves, were performed on a 1.5-T MRI scanner. Whereas 5 patients had the diagnosis of THS, paracavernous meningiomas in 4 patients, pituitary macroadenomas with cavernous sinus infiltration in 3 patients, Meckel's cave neurinoma in 1 patient, and suprasellar epidermoid in 1 patient were surgically proven MRI findings. Other pathological MRI findings were leptomeningeal metastases in 3 patients, granulomatous pachymeningitis sequelae in 2 patients, and aneurysm with compression on cavernous sinus in 1 patient. Three patients had normal MRI findings. The incidence of radiologically proven diagnosis of THS among the patients with the clinical findings suggesting THS seemed to be low in our study. In conclusion, MRI is the most valuable imaging technique to distinguish THS from other THS-like entities, and permits a precise assessment, management, and therapeutic planning of the underlying pathological conditions. (orig.)

291

CORRELATION OF PAIN AND DISABILITY WITH MRI FINDINGS IN PATIENTS WITH LUMBAR DISCOGENIC BACK PAIN  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Background: Lumbar disc prolapse is one of the common causes of low back pain seen in the working population. There are contradictorty reports regarding the clinical significance of various magnetic resonance imaging (MRI) findings observed in these patients. Purpose: The aim of the study was to determine the association of magnetic resonance imaging (MRI) findings with intensity of pain and self reported disability among persons with lumbar discogenic back pain. Material And M...

Wani, Surendra K.; Neha Deshpande

2014-01-01

292

Cyclic sciatica caused by infiltrative endometriosis: MRI findings  

International Nuclear Information System (INIS)

Endometriosis, an important gynecological disorder of reproductive women, affects most commonly the ovaries and less frequently the gastrointestinal tract, chest, urinary tract, and soft tissues. Endometriosis classically appears on MRI as a mass with a large cystic component and variable signal intensities on T1- and T2-weighted images due to the presence of variable degradation of hemorrhagic products. Endometriosis in an atypical location, an infiltrative appearance and without cystic-hemorrhagic components has rarely been described. We report on a 33-year-old woman with cyclic sciatica due to histologically documented infiltrative endometriosis involving the area of the left sciatic notch. (orig.)

293

Cyclic sciatica caused by infiltrative endometriosis: MRI findings  

Energy Technology Data Exchange (ETDEWEB)

Endometriosis, an important gynecological disorder of reproductive women, affects most commonly the ovaries and less frequently the gastrointestinal tract, chest, urinary tract, and soft tissues. Endometriosis classically appears on MRI as a mass with a large cystic component and variable signal intensities on T1- and T2-weighted images due to the presence of variable degradation of hemorrhagic products. Endometriosis in an atypical location, an infiltrative appearance and without cystic-hemorrhagic components has rarely been described. We report on a 33-year-old woman with cyclic sciatica due to histologically documented infiltrative endometriosis involving the area of the left sciatic notch. (orig.)

Yekeler, Ensar; Kumbasar, Basak; Tunaci, Atadan; Barman, Ahmet; Tunaci, Mehtap [Department of Radiology, Istanbul Faculty of Medicine, Istanbul University, 34390, Capa, Istanbul (Turkey); Bengisu, Ergin [Department of Obstetrics and Gynecology, Istanbul Faculty of Medicine, Istanbul University, Istanbul (Turkey); Yavuz, Ekrem [Department of Pathology, Istanbul Faculty of Medicine, Istanbul University, 34390, Capa, Istanbul (Turkey)

2004-03-01

294

MRI Findings of Primary CNS Lymphoma in 26 Immunocompetent Patients  

International Nuclear Information System (INIS)

To record the MR imaging features of primary central nervous system lymphoma (PCNSL) and compare these features in monofocal and multifocal disease. Twenty-one cases of monofocal disease were compared to five cases of multifocal disease. All patients were examined by nonenhanced and contrast-enhanced MRI. Tumor location, tumor size, signal intensity, enhancement characteristics, age distribution, peritumoral edema, cystic changes, and the presence of calcifications were assessed. The MRI features were compared between the monofocal and multifocal disease cases. The 26 cases, including both the monofocal and multifocal cases, exhibited 37 lesions. Contrast-enhanced images showed variable enhancement patterns: homogeneous enhancement (33 lesions), ring-like enhancement (2), and 'open-ring-like' enhancement (2). The 'notch sign' was noted in four of 33 homogeneously enhancing lesions. One case of hemorrhage and three cases of cystic formation were observed. Intra-tumoral calcification was not found. The frontal lobe, the corpus callosum and the basal ganglia were commonly affected in both the monofocal and multifocal groups. Tumor size differed significantly between the two groups (t = 3.129, p 0.05) and the signal characteristics (p > 0.05) between the two groups. Our data show that PCNSL has a vo groups. Our data show that PCNSL has a variable enhancement pattern on MR images. We first reported two lesions with an 'open-ring' enhancement as well as four cases with a 'notch sign'. Monofocal PCNSL cases typically have larger sized tumors with mild or moderate enhancement

295

Retroperitoneal Castleman's disease: US, CT and MRI findings  

International Nuclear Information System (INIS)

Purpose: To describe de imaging features of this unusual localization of Castleman's disease. Materials and methods: Two patients (man: 62 years old, woman: 27 years old) with epigastric abdominal pain were studied. The physical examination was negative in the woman while in the other case a peri umbilical tumor was observed. The laboratory and the tumor markers were negative. Both patients had a history of appendectomy. US, TC and MRI were performed. After surgery the pathological examination included stain techniques with hematoxylin-eosin, Masson's techniques and PAS. Results: Retroperitoneal Castleman's disease in peri pancreatic localization (extremely rare). The US showed slight hypoechoic homogeneous lesions with clear rims. CT without contrast revealed isodense lesions and one of them presented a small calcification, the e.v. contrast CT showed a clear homogeneous reinforcement. MRI demonstrated hypointense lesions on T1, hyperintense on T2, and after the administration of gadolinium these lesions showed a marked reinforcement on the arterial phase, which persisted on the late venous phase. The differential diagnosis with pancreatic tumoral pathology was difficult. The pathological examination revealed a lymphoid angio follicular hyperplasia of hyaline vascular type. Conclusion: Retroperitoneal Castlelman's disease is a rare entity. The different imaging methods did not provide an accurate diagnosis of this entity since there are no pathognomonic features. Thee there are no pathognomonic features. The pathological examination was required to define the diagnosis in both reported cases. (author)

296

Focal Pancreatitis Mimicking Pancreatic Mass: Magnetic Resonance Imaging (MRI)/Magnetic Resonance Cholangiopancreatography (MRCP) Findings Including Diffusion-Weighted MRI  

International Nuclear Information System (INIS)

Background: Focal pancreatitis (FP) is a confined inflammation that mimics a pancreatic mass. Its imaging diagnosis is important to avoid unnecessary procedures. Purpose: To describe the spectrum of magnetic resonance imaging (MRI)/magnetic resonance cholangiopancreatography (MRCP) and diffusion-weighted MRI (DWI) findings of focal pancreatitis mimicking pancreatic masses. Material and Methods: Findings of MRI/MRCP including DWI with a b value of 0 and 600 s/mm2 in 14 patients with pancreatic masses on MRI were retrospectively reviewed and compared to normal pancreas in 14 patients as a control group. Results: FP revealed hypointense signal intensity (SI) (3/14), hypo- to isointense SI (7/14), or isointense SI (4/14) on T1-weighted images, and hypointense SI (1/14), isointense SI (5/14), iso- to hyperintense SI (7/14), or hyperintense SI (1/14) on T2-weighted images compared to remaining pancreas (RP). MRCP images revealed dilatation of the common bile duct (CBD) and main pancreatic duct (MPD) (5/14), dilatation of the MPD only (3/14), dilatation of the CBD only (3/14), and normal MPD and CBD (3/14). Both FP and RP revealed three types of time-signal intensity curves: 1) rapid rise to a peak, with a rapid decline (FP=2, RP=4), 2) slow rise to a peak, followed by a slow decline (FP=5, RP=4), and 3) slower rise to a peak, with a slow decline or plateau (FP=7, RP=6). Mean apparent diffusion coefficient (ADC) values for FP and RP were 2.09±0.18 and 2.03±0.2x10-3-3 mm2/s, respectively. ADC values of FP and RP revealed no significant difference. Conclusion: The spectrum of imaging findings of focal pancreatitis on MRI/MRCP including DWI was described. Findings of FP were not distinctive as compared to the remaining pancreas

297

Focal Pancreatitis Mimicking Pancreatic Mass: Magnetic Resonance Imaging (MRI)/Magnetic Resonance Cholangiopancreatography (MRCP) Findings Including Diffusion-Weighted MRI  

Energy Technology Data Exchange (ETDEWEB)

Background: Focal pancreatitis (FP) is a confined inflammation that mimics a pancreatic mass. Its imaging diagnosis is important to avoid unnecessary procedures. Purpose: To describe the spectrum of magnetic resonance imaging (MRI)/magnetic resonance cholangiopancreatography (MRCP) and diffusion-weighted MRI (DWI) findings of focal pancreatitis mimicking pancreatic masses. Material and Methods: Findings of MRI/MRCP including DWI with a b value of 0 and 600 s/mm2 in 14 patients with pancreatic masses on MRI were retrospectively reviewed and compared to normal pancreas in 14 patients as a control group. Results: FP revealed hypointense signal intensity (SI) (3/14), hypo- to isointense SI (7/14), or isointense SI (4/14) on T1-weighted images, and hypointense SI (1/14), isointense SI (5/14), iso- to hyperintense SI (7/14), or hyperintense SI (1/14) on T2-weighted images compared to remaining pancreas (RP). MRCP images revealed dilatation of the common bile duct (CBD) and main pancreatic duct (MPD) (5/14), dilatation of the MPD only (3/14), dilatation of the CBD only (3/14), and normal MPD and CBD (3/14). Both FP and RP revealed three types of time-signal intensity curves: 1) rapid rise to a peak, with a rapid decline (FP=2, RP=4), 2) slow rise to a peak, followed by a slow decline (FP=5, RP=4), and 3) slower rise to a peak, with a slow decline or plateau (FP=7, RP=6). Mean apparent diffusion coefficient (ADC) values for FP and RP were 2.09+-0.18 and 2.03+-0.2x10-3 mm2/s, respectively. ADC values of FP and RP revealed no significant difference. Conclusion: The spectrum of imaging findings of focal pancreatitis on MRI/MRCP including DWI was described. Findings of FP were not distinctive as compared to the remaining pancreas

Momtahen, A.J.; Balci, N.C.; Alkaade, S.; Akduman, E.I.; Burton, F.R. (Depts. of Radiology and Gastroenterology, St. Louis Univ. Hospitals, St. Louis, MI (US))

2008-06-15

298

Radiological analysis of intraarterial chemotherapeutic effects in osteogenic sarcoma: focussed on MRI and IA DSA findings  

Energy Technology Data Exchange (ETDEWEB)

For the evaluation of the effect of intraarterial chemotherapy with CDDP (cis-diaminedichloroplatinum) in the treatment of osteogenic sarcoma, we compared radiographic findings of magnetic resonance imaging (MRI) and intraarterial digital subtraction angiography (IA DSA) with the degree of tumor necrosis in pathologic specimens. The decrease in neovascularity and tumor stain in IA DSA showed good correlation with tumor response (necrosis) to IA chemotherapy. MRI was useful in the localization of intra-and extramedullary tumor, and detection of skip metastases, but signal intensity changes showed poor correlation with tumor response to chemotherapy. In gadolinium diethyl triamine pentaacetic acid enhanced MRI (Gd-DTPA MRI), the enhancing areas closely correlated with the areas of tumor stain in IA DSA. In conclusion, IA DSA is a good imaging tool and Gd-DTPA MRI is expected to become a more useful modality in the evaluation of tumor response to chemotherapy in osteogenic sarcoma.

Lee, Goo; Kim, In One; Yeon, Kyung Mo; Yoon, Hyun Ki; Ahn, Hyo Seop [Seoul National University College of Medicine, Seoul (Korea, Republic of)

1991-09-15

299

Radiological analysis of intraarterial chemotherapeutic effects in osteogenic sarcoma: focussed on MRI and IA DSA findings  

International Nuclear Information System (INIS)

For the evaluation of the effect of intraarterial chemotherapy with CDDP (cis-diaminedichloroplatinum) in the treatment of osteogenic sarcoma, we compared radiographic findings of magnetic resonance imaging (MRI) and intraarterial digital subtraction angiography (IA DSA) with the degree of tumor necrosis in pathologic specimens. The decrease in neovascularity and tumor stain in IA DSA showed good correlation with tumor response (necrosis) to IA chemotherapy. MRI was useful in the localization of intra-and extramedullary tumor, and detection of skip metastases, but signal intensity changes showed poor correlation with tumor response to chemotherapy. In gadolinium diethyl triamine pentaacetic acid enhanced MRI (Gd-DTPA MRI), the enhancing areas closely correlated with the areas of tumor stain in IA DSA. In conclusion, IA DSA is a good imaging tool and Gd-DTPA MRI is expected to become a more useful modality in the evaluation of tumor response to chemotherapy in osteogenic sarcoma

300

Lumbar Modic Changes - A Comparison Between Findings at Low-and High-field MRI  

DEFF Research Database (Denmark)

Study design A cross-sectional observational study. Objective To investigate if there is a difference in findings of lumbar Modic changes in low-field (0.3 Tesla) magnetic resonance imaging (MRI) as compared to high field (1.5 Tesla). Summary of background data It is a challenge to give patients with low back pain (LBP) a specific diagnosis. Modic changes as seen on MRI have been reported to be a possible source of pain. However, it is unclear if the diagnosis is independent on the field strength. Methods Twenty patients with Modic changes, 11 women and 9 men (mean age 53.6, range 29-81), with or without sciatica, seen in a Danish outpatient LBP clinic were included. All patients had MRI scans on both a high-field and a low-field MRI scanner. Two radiologists evaluated all lumbar endplates independently using a standardized evaluation protocol. Kappa statistics were used to analyze the inter-observer reproducibility. To analyze the difference between low- and high-field MRI we used paired t-test. Results The total number of Modic changes diagnosed with high-field MRI was significantly higher as compared to low-field MRI. However, 3-4 times as many Modic type 1 changes were found with low-field MRI as compared to high-field. Contrarily, with high-field MRI type 2 changes were diagnosed twice as often. Conclusion There was a significant difference between low- and high-field MRI regarding the overall prevalence of any Modic change, but this had opposite directions for type 1 and 2: Type 2 dominated in low field, and conversely in high field. The type of MRI unit should be taken into consideration when diagnosing patients with Modic changes.

Bendix, Tom; Sorensen, Joan S

2012-01-01

 
 
 
 
301

MRI in the acute phase of spiral cord traumatic lesions: relationship between MRI findings and neurological outcome  

International Nuclear Information System (INIS)

Purpose. To evaluate the role of emergency MRI in the diagnosis of acute spinal injuries, and to correlate the MRI pattern with the neurological outcome. Materials and methods. Thirty-eight patients with MRI-proven spinal cord injury were classified according to the Frankel classification. MRI was always performed within 8 hours from trauma. Frankel classification divides spinal cord injuries into 5 classes of decreasing severity based on the presence of motor and/or sensory function loss. On the basis of the MRI findings the patients were classified in 3 groups: group 1 (intramedullary haematoma), group 2 (multi-meta-mer oedema), group 3 (single-metamer oedema). All patients underwent neurosurgery and were clinically evaluated until the stabilization of neurological recovery. Mean follow-up lime was 12 months. The MR images were retrospectively evaluated and correlated to the neurological outcome. Results. Twenty eight patients showed complete motor loss (Frankel classes A and B); of these 28 patients 12 (42.8%) had MRI evidence of intramedullary haematoma, 12 (42.8%) had multi-metamer oedema and 4 (14.4%) had single-meta-mer oedema. Of the 10 patients with incomplete motor loss, none had MRI evidence of haemorrhage, 4 (40%) showed multi-metamer oedema and 6 (60%) showed single-meta-mer oedema. Follow-up clinical assessment revealed that 14/38 patients (36,8%) had clinical improvement and 2/38 cases (5%) had a complete motor recovery, as demonstrated by the move to arecovery, as demonstrated by the move to a higher Frankel class. Conclusions. Our results, consistent with previous reports, confirm a strong correlation between the MRI appearance of traumatic spinal cord injuries in acute phase and long-term recovery of motor and sensory function: patients with initial haemorrhage had a poor prognosis, whereas those with spinal cord oedema had a good clinical outcome, as demonstrated by the passage to a higher Frankel class. MRI is particularly important in the initial evaluation of unconscious patients who cannot undergo a motor and sensory neurological evaluation, and to define the prognosis, which will influence the correct therapeutic choice

302

MRI Findings of Primary CNS Lymphoma in 26 Immunocompetent Patients  

Energy Technology Data Exchange (ETDEWEB)

To record the MR imaging features of primary central nervous system lymphoma (PCNSL) and compare these features in monofocal and multifocal disease. Twenty-one cases of monofocal disease were compared to five cases of multifocal disease. All patients were examined by nonenhanced and contrast-enhanced MRI. Tumor location, tumor size, signal intensity, enhancement characteristics, age distribution, peritumoral edema, cystic changes, and the presence of calcifications were assessed. The MRI features were compared between the monofocal and multifocal disease cases. The 26 cases, including both the monofocal and multifocal cases, exhibited 37 lesions. Contrast-enhanced images showed variable enhancement patterns: homogeneous enhancement (33 lesions), ring-like enhancement (2), and 'open-ring-like' enhancement (2). The 'notch sign' was noted in four of 33 homogeneously enhancing lesions. One case of hemorrhage and three cases of cystic formation were observed. Intra-tumoral calcification was not found. The frontal lobe, the corpus callosum and the basal ganglia were commonly affected in both the monofocal and multifocal groups. Tumor size differed significantly between the two groups (t = 3.129, p < 0.01) and mildly or moderately enhanced lesions were more frequently found in the monofocal group (p < 0.05). There was no statistical difference between perifocal edema (p > 0.05) and the signal characteristics (p > 0.05) between the two groups. Our data show that PCNSL has a variable enhancement pattern on MR images. We first reported two lesions with an 'open-ring' enhancement as well as four cases with a 'notch sign'. Monofocal PCNSL cases typically have larger sized tumors with mild or moderate enhancement

Zhang, Dong; Wang, Wen Xian; Wen, Li; Zou, Li Guang [XinQiao Hospital, Third Military Medical University, ChongQing (China); Hu, Liang Bo [The Second People' s Hospital of ChongQing, ChongQing (Korea, Republic of); Henning, Tobias D.; Ravarani, Elisabeth M. [Technical University Munich, Munich (Germany); Feng, Xiao Yuan [HuaShan Hospital, Medical Center of FuDan University, ShangHai (China)

2010-06-15

303

MRI findings in Tolosa-Hunt syndrome before and after systemic corticosteroid therapy  

International Nuclear Information System (INIS)

Tolosa-Hunt syndrome (THS) is characterized by painful ophthalmoplegia due to a granulomatous inflammation in the cavernous sinus. Corticosteroid therapy dramatically resolves both the clinical and radiological findings of THS. We present MRI findings of six patients with a clinical history of at least one episode of unilateral or bilateral orbital-periorbital pain, clinical findings of associated paresis of one or more of 3rd, 4th, 5th or 6th cranial nerves. All of the patients revealed an enlargement of the symptomatic cavernous sinus on magnetic resonance imaging (MRI) scans. Five patients revealed total resolution of the clinical findings within 1-8 weeks, following systemic corticosteroid treatment. One patient revealed only minor regression of clinical findings within 2 weeks after the initiation of the treatment, so the cavernous sinus lesion was reevaluated as meningioma on MRI, and the patient underwent surgical resection of the mass with resultant histopathological finding of cavernous sinus meningioma. A follow-up MRI scan was performed for five patients at the end of 8-weeks of steroid therapy. Three of these five patients showed total resolution of the cavernous sinus lesions whereas two of them revealed a partial regression of the cavernous sinus lesions. MRI findings before and after systemic corticosteroid therapy are important diagnostic criteria to put the definitive diagnosis of THS and to differentiate it from other cavernous sinus lesions that simrom other cavernous sinus lesions that simulate THS both clinically and radiologically

304

MRI findings in Tolosa-Hunt syndrome before and after systemic corticosteroid therapy  

Energy Technology Data Exchange (ETDEWEB)

Tolosa-Hunt syndrome (THS) is characterized by painful ophthalmoplegia due to a granulomatous inflammation in the cavernous sinus. Corticosteroid therapy dramatically resolves both the clinical and radiological findings of THS. We present MRI findings of six patients with a clinical history of at least one episode of unilateral or bilateral orbital-periorbital pain, clinical findings of associated paresis of one or more of 3rd, 4th, 5th or 6th cranial nerves. All of the patients revealed an enlargement of the symptomatic cavernous sinus on magnetic resonance imaging (MRI) scans. Five patients revealed total resolution of the clinical findings within 1-8 weeks, following systemic corticosteroid treatment. One patient revealed only minor regression of clinical findings within 2 weeks after the initiation of the treatment, so the cavernous sinus lesion was reevaluated as meningioma on MRI, and the patient underwent surgical resection of the mass with resultant histopathological finding of cavernous sinus meningioma. A follow-up MRI scan was performed for five patients at the end of 8-weeks of steroid therapy. Three of these five patients showed total resolution of the cavernous sinus lesions whereas two of them revealed a partial regression of the cavernous sinus lesions. MRI findings before and after systemic corticosteroid therapy are important diagnostic criteria to put the definitive diagnosis of THS and to differentiate it from other cavernous sinus lesions that simulate THS both clinically and radiologically.

Cakirer, Sinan E-mail: scakirer@yahoo.com

2003-02-01

305

Novel MRI finding for diagnosis of invasive placenta praevia: evaluation of findings for 65 patients using clinical and histopathological correlations  

International Nuclear Information System (INIS)

To review established magnetic resonance (MR) criteria and describe a new MR finding for the diagnosis of invasive placenta praevia. A retrospective review of prenatal MRI examinations of 65 patients (median age: 35 years) who underwent MR for the screening of invasive placenta praevia. All MRIs were performed on a 1.5-T unit, including axial, coronal and sagittal T2-weighted half-Fourier single-shot turbo spin echo imaging. Fifteen patients were diagnosed with invasive placenta praevia. Two experienced radiologists reviewed the MR images and evaluated a total of six MRI features of the placenta, including our novel finding of the placental protrusion into the internal os (placental protrusion sign). Inter-rater reliability was assessed by using kappa statistics. Features with a kappa statistic >0.40 were evaluated using Fisher's two-sided exact test for comparison of their capabilities for placental invasion assessment. Interobserver reliability was moderate or better for the intraplacental T2 dark band, intraplacental abnormal vascularity, uterine bulging, heterogeneous placenta and placental protrusion sign. Fisher's two-sided exact test results showed all these features were significantly associated with invasive placenta praevia. The novel MRI finding of a placental protrusion sign is a useful addition to the established MRI findings for the diagnosis of invasive placenta praevia. (orig.)

306

Novel MRI finding for diagnosis of invasive placenta praevia: evaluation of findings for 65 patients using clinical and histopathological correlations  

Energy Technology Data Exchange (ETDEWEB)

To review established magnetic resonance (MR) criteria and describe a new MR finding for the diagnosis of invasive placenta praevia. A retrospective review of prenatal MRI examinations of 65 patients (median age: 35 years) who underwent MR for the screening of invasive placenta praevia. All MRIs were performed on a 1.5-T unit, including axial, coronal and sagittal T2-weighted half-Fourier single-shot turbo spin echo imaging. Fifteen patients were diagnosed with invasive placenta praevia. Two experienced radiologists reviewed the MR images and evaluated a total of six MRI features of the placenta, including our novel finding of the placental protrusion into the internal os (placental protrusion sign). Inter-rater reliability was assessed by using kappa statistics. Features with a kappa statistic >0.40 were evaluated using Fisher's two-sided exact test for comparison of their capabilities for placental invasion assessment. Interobserver reliability was moderate or better for the intraplacental T2 dark band, intraplacental abnormal vascularity, uterine bulging, heterogeneous placenta and placental protrusion sign. Fisher's two-sided exact test results showed all these features were significantly associated with invasive placenta praevia. The novel MRI finding of a placental protrusion sign is a useful addition to the established MRI findings for the diagnosis of invasive placenta praevia. (orig.)

Ueno, Yoshiko; Kitajima, Kazuhiro; Maeda, Tetsuo; Suenaga, Yuko; Takahashi, Satoru; Sugimura, Kazuro [Kobe University Graduate School of Medicine, Department of Radiology, Kobe (Japan); Kawakami, Fumi [Kobe University Graduate School of Medicine, Department of Pathology, Kobe (Japan); Matsuoka, Shozo; Tanimura, Kenji; Yamada, Hideto [Kobe University Graduate School of Medicine, Department of Obstetrics and Gynaecology, Kobe (Japan); Ohno, Yoshiharu [Kobe University Graduate School of Medicine, Department of Radiology, Kobe (Japan); Kobe University Graduate School of Medicine, Advanced Biomedical Imaging Research, Kobe (Japan)

2014-04-15

307

Pulmonary Aspergillus chest wall involvement in chronic granulomatous disease: CT and MRI findings  

International Nuclear Information System (INIS)

Pulmonary Aspergillus infection in patients with chronic granulomatous disease tends to involve the chest wall and consequently carries a high mortality rate. We report the findings of computed tomography (CT) and magnetic resonance imaging (MRI) in three such cases. We suggest that CT and MRI have a complementary role in evaluating chest wall invasion by pulmonary Aspergillus infection in chronic granulomatous disease. (orig./GDG)

308

MRI FINDINGS DO NOT CORRELATE WITH OUTCOME IN ATHLETES WITH CHRONIC GROIN PAIN  

Directory of Open Access Journals (Sweden)

Full Text Available This trial aimed to assess the value of MRI in the differential diagnosis of chronic groin pain in athletes, a condition caused by various pathologies, the most common being posterior abdominal wall deficiency, osteitis pubis and muscular imbalance. Nineteen subjects with clinically ruled-out hernia and recurrent episodes of exercise-triggered groin pain were assessed. Dynamic MRI was performed under Valsalva manoeuver and at rest within a training- free period and after training activity. Follow-up was performed after 4 years using a questionnaire and physical examination. An incipient hernia was seen in one case, Valsalva manoeuver provoked a visible bulging in 7 others (3 bilateral. Eight athletes showed symphysitis (accompanied by bulging in 3 cases. MRI visualized one hydrocele, one osteoma of the left femur, one enchondroma of the pubic bone, and one dilated left ureter without clinical symptoms or therapeutic relevance. MRI findings after training and during the training free period did not vary. Fifteen participants were available for a follow-up control examination 4 years later - one suffered from ongoing pain, eleven were free of symptoms and three had improvement. However, most of them improved only with changing or reducing training. There were four participants with a specific therapy of their MRI findings. MRI revealed a variety of pathological findings in athletes suffering from chronic groin pain, but it was not reliable enough in differentiating between diagnoses requiring conservative or operative treatment. The MRI examination within the training interval did not have an advantage to that within the training-free period. Further randomized prospective trials with a long follow-up should establish whether MRI findings could be of help in the choice between conservative and surgical treatment for chronic groin pain

Adrien Daigeler

2007-03-01

309

Giant Cell Tumor of Soft Tissue: a Case with Atypical US and MRI Findings  

International Nuclear Information System (INIS)

We report the case of a giant cell tumor with diffuse interstitial hemorrhaging and unusually prominent cystic components in the soft tissue of the thigh which has not been reported previously. Magnetic resonance image (MRI), showed signal intensity typical of a giant cell tumor. However, because of its conspicuous large well-circumscribed cystic components, the differential diagnoses, based on the image findings from an ultrasonography (US) and MRI, were complicated epidermoid cyst, cystic change of a neurogenic tumor, and a parasitic cyst

310

Tendon involvement in rheumatoid arthritis of the wrist: MRI findings  

International Nuclear Information System (INIS)

Objective. To evaluate the distribution and extent of wrist tendon alterations in patients with active rheumatoid arthritis (RA) using magnetic resonance imaging (MRI). Design and patients. Forty-three clinically active RA patients with an illness duration of less than 4 years and no clinical evidence of tendons tears were enrolled in the study. There were 10 men and 33 women, with an average age of 52 years (range 33-63 years). MRI of both wrists, with one exception, was performed at 1.0 T using T1- and T2-weighted sequences (slice thickness 3 mm). Twelve healthy subjects (8 women, 4 men; mean age 31 years) were also evaluated as a control group. Two radiologists reviewed each of four schematic anatomical regions (volar, dorsal, ulnar, radial) for the degree of tendon and tendon sheath alterations using two progressive scales. Results. In the control group all tendons had homogeneous low signal intensity on all sequences. A small amount of fluid was found in six subjects but the diameter was always less than 1 mm. In the patient group minimal fluid (5mm) in 26 (31%) and grade 3 fluid (>5 mm) in 24 (28%). Fiftynine (69%) of the grade 1 changes were in the volar compartment but grade 2 involvement was evenly distributed. Grade 3 changes were most common in the dorsal compartment and combined grade 2 and 3 in the dorsal and ulnar compartments were 32 (38%) and 25 (30%) compared with 16 (18%) and 17 (20%) respectivelred with 16 (18%) and 17 (20%) respectively in the volar and radial compartments. The tendons were normal (grade 0) in 47 (46%) wrists. A maximum tendon signal change (grade 1) was demonstrated in 28 wrists (32%). When associated with other individual tendons grades this grade was demonstrated in the dorsal compartment in 30 (35%) wrists, in the volar compartment in 12 (14%), in the radial compartment in 17 (20%) and in the ulnar compartment in 26 (30%). A partial tear (grade 2) was detected in 7 (8%) wrists, all involving the dorsal and ulnar compartments; five underwent surgical repair and one proved to have a complete rupture of extensor digitorum. Three (3%) had a grade 3 complete tendon tear: All of these were in extensor tendons. Surgical repair was successful in one case but two ruptured again within 3 months. (orig.)

311

Tendon involvement in rheumatoid arthritis of the wrist: MRI findings  

Energy Technology Data Exchange (ETDEWEB)

Objective. To evaluate the distribution and extent of wrist tendon alterations in patients with active rheumatoid arthritis (RA) using magnetic resonance imaging (MRI). Design and patients. Forty-three clinically active RA patients with an illness duration of less than 4 years and no clinical evidence of tendons tears were enrolled in the study. There were 10 men and 33 women, with an average age of 52 years (range 33-63 years). MRI of both wrists, with one exception, was performed at 1.0 T using T1- and T2-weighted sequences (slice thickness 3 mm). Twelve healthy subjects (8 women, 4 men; mean age 31 years) were also evaluated as a control group. Two radiologists reviewed each of four schematic anatomical regions (volar, dorsal, ulnar, radial) for the degree of tendon and tendon sheath alterations using two progressive scales. Results. In the control group all tendons had homogeneous low signal intensity on all sequences. A small amount of fluid was found in six subjects but the diameter was always less than 1 mm. In the patient group minimal fluid (<2 mm) was found in 35 (41%) wrists, grade 2 fluid (<2>5mm) in 26 (31%) and grade 3 fluid (>5 mm) in 24 (28%). Fiftynine (69%) of the grade 1 changes were in the volar compartment but grade 2 involvement was evenly distributed. Grade 3 changes were most common in the dorsal compartment and combined grade 2 and 3 in the dorsal and ulnar compartments were 32 (38%) and 25 (30%) compared with 16 (18%) and 17 (20%) respectively in the volar and radial compartments. The tendons were normal (grade 0) in 47 (46%) wrists. A maximum tendon signal change (grade 1) was demonstrated in 28 wrists (32%). When associated with other individual tendons grades this grade was demonstrated in the dorsal compartment in 30 (35%) wrists, in the volar compartment in 12 (14%), in the radial compartment in 17 (20%) and in the ulnar compartment in 26 (30%). A partial tear (grade 2) was detected in 7 (8%) wrists, all involving the dorsal and ulnar compartments; five underwent surgical repair and one proved to have a complete rupture of extensor digitorum. Three (3%) had a grade 3 complete tendon tear: All of these were in extensor tendons. Surgical repair was successful in one case but two ruptured again within 3 months. (orig.)

Valeri, G.; Ferrara, C.; Ercolani, P.; De Nigris, E. [Ancona Univ. (Italy). Dept. of Radiology; Giovagnoni, A. [Modena Univ. (Italy). Dept. of Radiology

2001-03-01

312

Identifying biological pathways in the MRI findings of people with low back pain  

DEFF Research Database (Denmark)

Title Identifying biological pathways in the MRI findings of people with low back pain Authors and affiliations Rikke K Jensen1, Tue Secher Jensen1, Per Kjaer1,2, Peter Kent1 1Research Department, Spine Centre of Southern Denmark, Hospital Lillebaelt, Institute of Regional Health Services Research, University of Southern Denmark, Part of the Clinical Locomotion Network, Middelfart, Denmark. 2Institute of Sports Science and Clinical Biomechanics, University of Southern Denmark, Part of the Clinical Locomotion Network, Odense, Denmark Contact email rikke.kruger.jensen@slb.regionsyddanmark.dk Background Investigations into the association between lumbar MRI findings and low back pain (LBP) are complicated by multiple MRI findings being present at the same time. Findings such as lumbar intervertebral disc protrusions or endplate changes almost always co-exist with other degenerative disc findings such as the reduction of disc height and signal intensity. Despite this, the majority of previous research has focused solely on the associations between single imaging findings and pain or other clinical outcomes. Only recently have researchers started to engage with this complexity of MRI findings. An initial strategy to advance this area of investigation would be to recognise which MRI findings typically occur together and whether those clusters appear to reflect discrete biological pathways. Therefore, the objectives of this proof-of-concept study were to identify which vertebral MRI findings cluster together and describe plausible biological pathways that these clusters might represent. Methods All participants were people with chronic LBP seeking a comprehensive evaluation at an outpatient spine clinic in a Danish university hospital. Data for this study was extracted from the MRI findings of 631 people (3,155 lumbar spine motion segments) whose images were quantitatively coded using a detailed research protocol as part of the recruitment phase of two clinical trials. Reproducibility is high when using this MRI coding protocol (kappa 0.52-0.97). The MRI variables included in this study were information on intervertebral disc height and signal intensity, disc protrusions, high intensity zones, size and type of vertebral endplate signal changes, vertebral endplate irregularities and defects, osteophytes, and spondylolisthesis. Latent class analysis (probabilistic data mining) was used to distinguish the best fitting clusters of MRI findings. The distribution of lumbar disc levels in each cluster was also reported. Based on known histological changes inherent in the degeneration process of the motion segment, the clusters were grouped into hypothetical biological pathways. Results Latent class analysis identified twelve clusters of MRI findings. One cluster, characterised by no abnormal MRI findings, contained 52% of the motion segments and represented the normal, pre-degenerative motion segments. The following hypothetical pathways were derived from the content of the other clusters: (i) two clusters representing progressive stages of disc degeneration in the lower lumbar levels; (ii) four clusters representing progressive stages of disc protrusions and endplate changes in the lower lumbar levels; (iii) two cluster with endplate changes at either the upper or the lower endplates; (iv) two clusters containing progressive endplate changes and disc degeneration at the upper lumbar levels only; and lastly, (v) one cluster containing osteophytes at the upper lumbar motion segments. Conclusions MRI findings of lumbar vertebral motion segments were grouped into twelve clusters and those clusters fitted into a model of five different biological pathways of degeneration. Future research will test the association between these clusters and clinically important characteristics such as pain and activity limitation.

Jensen, Rikke Krüger; Jensen, Tue Secher

313

Comparison of hemodynamics of intracranial aneurysms between MR fluid dynamics using 3D cine phase-contrast MRI and MR-based computational fluid dynamics  

International Nuclear Information System (INIS)

Hemodynamics is thought to play a very important role in the initiation, growth, and rupture of intracranial aneurysms. The purpose of our study was to compare hemodynamics of intracranial aneurysms of MR fluid dynamics (MRFD) using 3D cine PC MR imaging (4D-Flow) at 1.5 T and MR-based computational fluid dynamics (CFD). 4D-Flow was performed for five intracranial aneurysms by a 1.5 T MR scanner. 3D TOF MR angiography was performed for geometric information. The blood flow in the aneurysms was modeled using CFD simulation based on the finite element method. We used MR angiographic data as the vascular models and MR flow information as boundary conditions in CFD. 3D velocity vector fields, 3D streamlines, shearing velocity maps, wall shear stress (WSS) distribution maps and oscillatory shear index (OSI) distribution maps were obtained by MRFD and CFD and were compared. There was a moderate to high degree of correlation in 3D velocity vector fields and a low to moderate degree of correlation in WSS of aneurysms between MRFD and CFD using regression analysis. The patterns of 3D streamlines were similar between MRFD and CFD. The small and rotating shearing velocities and higher OSI were observed at the top of the spiral flow in the aneurysms. The pattern and location of shearing velocity in MRFD and CFD were similar. The location of high oscillatory shear index obtained by MRFD was near to that obtained by CFD. MRFD and CFD of intracranial aneurysms correlated fairly wellracranial aneurysms correlated fairly well. (orig.)

314

Clinical and MRI findings in three dogs with polycystic meningiomas.  

Science.gov (United States)

One spayed female Labrador retriever and two castrated male golden retrievers were evaluated for chronic (i.e., ranging from 3 wk to 24 wk) neurologic signs localizable to the prosencephalon. Signs included seizures, circling, and behavior changes. MRI demonstrated extra-axial, contrast-enhancing, multiloculated, fluid-filled, cyst-like lesions with a mass effect, causing compression and displacement of brain parenchyma. Differential diagnoses included cystic neoplasm, abscess or other infectious cyst (e.g., alveolar hydatid cyst), or fluid-filled anomaly (e.g., arachnoid cyst). The cyst-like lesions were attached to the rostral falx cerebri in all cases. In addition, case 2 had a second polycystic mass at the caudal diencephalon. Surgical biopsy (case 3 with a single, rostral tumor via transfrontal craniectomy) and postmortem histology (in cases 1 and 2) confirmed polycystic meningiomas. Tumor types were transitional (cases 1 and 3) and fibrous (case 2), with positive immunohistochemical staining for vimentin. Case 3 was also positive for E-cadherin, s100, and CD34. In all cases, staining was predominantly negative for glial fibrillary acid protein and pancytokeratins, supporting a diagnosis of meningioma. This report describes the first cases of polycystic meningiomas in dogs. Polycystic meningiomas are a rare, but important, addition to the differential diagnoses for intracranial cyst-like lesions, significantly affecting planning for surgical resection and other therapeutic interventions. PMID:22843828

James, Fiona M K; da Costa, Ronaldo C; Fauber, Amy; Peregrine, Andrew S; McEwen, Beverly; Parent, Joane M; Bergman, Robert

2012-01-01

315

Neurovascular compression of cranial nerves: CT and MRI findings  

International Nuclear Information System (INIS)

Purpose: The compression of a nervous structure by an aberrant vessel may be asymptomatic or produce an important symptoms, in these cases CT and MRI show relevant information. Materials and Methods: Between January 1998 and March 2001, we studied 27 patients: 8 with trigeminal neuralgia, 7 with hemi facial spasm, 4 vertigo and tinnitus, 2 hemianopsia, 1 with neuralgia of the amygdalin fossa, 1 with bitonal voice, 1 with tongue deviation with fascicular movements, 2 essential hypertension and 1 with severe headache. All of them had a neurologic evaluation from 2 specialists and 2 neuro radiologists interpreted the results. Results: The CT and RMI images with special sequences allowed to prove the compression of the entry segments of the V, VII, IX, X and XII cranial nerves, of the optic chiasma and the ventrolateral aspect of the medulla oblongata in close relation with the vasopressor centre. Also they demonstrate a rare vessel in the Silvio aqueduct avoiding the normal flow of the CSF. Of the total of patients that were studied, 37% had surgical confirmation. Conclusion: CT and RMI are sensitive and specific methods for the detection of vascular compressions of nervous structures. (author)

316

MRI findings in posterior disc prolapse associated with cervical fracture dislocation  

International Nuclear Information System (INIS)

Although disc injury is common in cervical spinal fractures the mechanism of disc herniation in cervical fracture dislocations is not known. This study evaluated the pathogenesis of disc hernia in cervical fracture dislocations. Twenty-two patients who underwent anterior and posterior spinal fixation were studied. Findings of preoperative magnetic resonance imaging (MRI) were compared with surgical findings. During surgery, cervical disk hernia were found in six patients (27 %), and the MRI finding of these patients were evaluated in detail. We concluded that the characteristic MRI findings of cervical disc hernia are as follows: 1) discontinuity of injured disc, 2) anterior indentation of spinal cord at the site of dislocated vertebral body, and 3) signal irregularity at the site of interspace between dislocated vertebral body and spinal cord. (author)

317

MRI findings in posterior disc prolapse associated with cervical fracture dislocation  

Energy Technology Data Exchange (ETDEWEB)

Although disc injury is common in cervical spinal fractures the mechanism of disc herniation in cervical fracture dislocations is not known. This study evaluated the pathogenesis of disc hernia in cervical fracture dislocations. Twenty-two patients who underwent anterior and posterior spinal fixation were studied. Findings of preoperative magnetic resonance imaging (MRI) were compared with surgical findings. During surgery, cervical disk hernia were found in six patients (27 %), and the MRI finding of these patients were evaluated in detail. We concluded that the characteristic MRI findings of cervical disc hernia are as follows: (1) discontinuity of injured disc, (2) anterior indentation of spinal cord at the site of dislocated vertebral body, and (3) signal irregularity at the site of interspace between dislocated vertebral body and spinal cord. (author).

Maeda, Go; Shiba, Keiichiro; Ueta, Takayoshi; Shirasawa, Kenzo; Ohta, Hideki; Mori, Eiji; Rikimaru, Shunichi; Hida, Shinichi; Tokunaga, Masami (Spinal Injuries Center, Fukuoka (Japan))

1994-03-01

318

Correlation of clinical and MRI findings of tempero mandibular joint internal derangement  

Directory of Open Access Journals (Sweden)

Full Text Available The most common clinical features of tempero-mandibular joint internal derangement are correlated with the MRI findings of shape of the disc in an attempt to find the etiology of tempero-mandibular joint internal derangement. In this study, the clinical parameters of pain, muscle tenderness, clicking with in the joint (like early, middle and late are correlated with the MRI findings of disc shapes. (like biconcave, thick, lengthened, folded, adhesion. The study reveals any trauma that leads to muscle tenderness results in internal derangement of tempero-mandibular joint.

Chowdary U

2006-01-01

319

Cine e identidades virtuales  

Directory of Open Access Journals (Sweden)

Full Text Available The subject is the ability the cinema has performed - since its very begining - as a creation instrument of national and transnational identities. In the first place, it covers Spanish cinema since 1938 and right after the end of the Spanish Civil War, II World War Italian-German cinema, Eisenstein’s, Leni Riefenstahl’s, Griffth’s and Ford’s cinema, the role American war and science fiction productions played, as well as the comedies dealing with the divided Berlin subject. The role of computers and video-games and the new cinema positionings that forecast the end of what is real, is studied through films such as Tron, The Lawnmower Man, Johnny Mnemonic, Ghost in the shell, Simone o Matrix.Se estudia la capacidad del cine desde sus orígenes como instrumento de generación de identidades nacionales y transnacionales. Se realiza, en primer lugar, un recorrido por el cine español desde 1938 y tras el final de la guerra civil, el cine italo-alemán de la II Guerra Mundial, el cine de Eisenstein, Leni Riefenstahl, Griffth y Ford, y el papel que jugaron las producciones norteamericanas bélicas y de ciencia ficción, así como las comedias sobre el Berlín dividido. El papel de los ordenadores y los videojuegos, y los nuevos planteamientos cinematográficos que pronostican el final de lo real se estudia a través de películas como Tron, El cortador de césped, Johnny Mnemonic, Ghost in the shell, Simone o Matrix.

Labrador Ben, Julia María

2006-12-01

320

Cine y Modernismo  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Unidad Didáctica de Innovación Educativa de proyección semiótica interdisciplinar entre Cine y Literatura aplicada al nivel de Cuarto Curso de Educación Secundaria Obligatoria, de acuerdo con las disposiciones legales de la LOE. Sus actividades de aprendizaje siguen una metodología de iniciación a la investigación para el desarrollo del aprendizaje en competencias comunicativas.

Gonza?lez Garci?a, Mari?a; Caro Valverde, Mari?a Teresa

2008-01-01

 
 
 
 
321

Incidental findings on MRI scans of patients presenting with audiovestibular symptoms  

Directory of Open Access Journals (Sweden)

Full Text Available Abstract Background The evaluation of patients presenting with audiovestibular symptoms usually includes MRI of the internal auditory meatus, the cerebellopontine angle and the brain. A significant percentage of these scans will present unexpected, incidental findings, which could have important clinical significance. Objective To determine the frequency and clinical significance of incidental findings on MRI scans of patients with audiovestibular symptoms. Materials and methods A retrospective analysis of 200 serial MRI scans. Results Gender distribution: equal. Age range: 17-82 years. One-hundred and four scans (52% were normal and 1 scan (0.5% demonstrated a unilateral vestibular schwannoma. Ninety-five scans (47.5% demonstrated incidental findings. Sixty-six of these (33% were considered of ishaemic origin and did not require further action. Five (2.5% scans demonstrated significant findings which warranted appropriate referral; Two Gliomas (1%, 2 cases of extensive White Matter Lesions (1%, 1 lipoma (0.5%. The remaining scans demonstrated various other findings. Conclusion Investigation of patients with audiovestibular symptoms with MRI scans revealed incidental findings in a significant percentage (47.5%. The majority of these findings were benign warranting no further action and only 2.5% required further referral. It is the responsibility of the referring Otolaryngologist to be aware of these findings, to be able to assess their significance, to inform the patient and if needed to refer for further evaluation.

Khan Mohammad H

2010-06-01

322

Brain MRI findings in patients with initial cerebral thrombosis and the relationship between incidental findings, aging and dementia  

International Nuclear Information System (INIS)

To estimate the relationship between aging, dementia and changes observed on magnetic resonance imaging (MRI) seen in elderly patients with cerebral thrombosis, MRI findings in 103 patients with an initial stroke event (thrombosis group) were compared with those of 37 patients with hypertension/diabetes (high risk group) and 78 patients without those disorders (low risk group). In addition to the causative lesions in the thrombosis group, periventricular hyperintensities (PVH), spotty lesions (SL), silent infarctions (SI), ventricular dilatation (VD), and cortical atrophy (CA) were analyzed in these groups. Infarctions located in the internal capsule/corona radiata were the most frequent causative lesion. Compared to the low risk group, a high incidence of patchy/diffuse PVH, SI, and severe CA was seen in both the thrombosis group and the high risk group. Widespread PVH and multiple SL increased with age in the thrombosis group, while severe CA was seen in each group. SI and VD tended to increase after age 60, though they were not significant. Dementia, diagnosed in 40 out of 78 patients, increased with age. Multivariate analysis revealed the degree of the effects of MRI findings on dementia to be marked in PVH, brain atrophy, causative lesions, and SL, in that order. These results indicated that diffuse PVH and brain atrophy, developing with age, promoted dementia in the elderly with vascular lesions. Moreover, they suggested that a variety of silent brain lesions re that a variety of silent brain lesions recognized on MRI other than infarction can affect symptoms in the elderly. (author)

323

CT and MRI findings and classification study of brain schistosomiasis granuloma  

International Nuclear Information System (INIS)

Objective: To study CT and MRI features and classification of brain schistosomiasis granuloma. Methods: CT and MRI data of 30 cases of brain schistosomiasis granuloma were reviewed. All cases were proved by the surgery or pathological examination and clinical laboratory test. There were 20 males and 10 females, and their age ranged from 5 to 58 years, mean 29.2 years. Plain and enhanced CT were performed in all patients with GE MAX 640 scanner. Ten patients were examined by plain and enhanced MRI with GE Signa profile 0.2 Tesla open scanner. Results: The lesions located in supratentorial region in 27 cases and in infratentorial region in 3 cases. The nodules were isodense or slight hyperdense on CT plain scan, iso or hypointense on T1WI, hyperintense on T2WI, Slight hyperintense on FLAIR. After the contrast material was injected intravenously, CT and MRI findings were multiple or single enhanced nodules at the cortical or subcortical area. There were four types of imaging features: (1) multiple small nodules in 5 cases (presenting as bright stars in the dark sky); (2) single large nodule in 8 cases; (3) mixed nodules in 14 cases; (4) circle-enhanced nodules in 3 cases. Conclusion: The brain schistosomiasis granuloma has typical CT and MRI findings. CT and MRI classification is not only helpful to its diagnosis and differential diagnosis, but also might be useful for the choice of clinical treatment

324

MRI findings in an infant with vaccine-associated paralytic poliomyelitis  

Energy Technology Data Exchange (ETDEWEB)

Although acute flaccid paralysis is a manifestation observed in several neurologic and muscular disorders, vaccine-associated paralytic poliomyelitis (VAPP) is an exceedingly rare etiology. In the clinical setting of acute flaccid paralysis, MRI is useful in differentiating between VAPP and other conditions. Additionally, MRI can assess the extent of lesions. However, reports on MRI findings in VAPP are scarce in the pediatric radiology literature. We report a Brazilian infant who developed VAPP 40 days after receiving the first dose of oral polio vaccine (OPV). MR images of the cervical and thoracic spinal cord showed lesions involving the anterior horn cell, with increased signal intensity on T2-weighted sequences. We would like to emphasize the importance of considering VAPP as a differential diagnosis in patients with acute flaccid paralysis and an MRI showing involvement of medulla oblongata or spinal cord, particularly in countries where OPV is extensively administered. (orig.)

Lopes Ferraz-Filho, Jose Roberto [Sao Jose do Rio Preto Medical School, Department of Radiology, Hospital de Base, Sao Paulo, State (Brazil); Sao Jose do Rio Preto Medical School, Department of Radiology, Sao Jose do Rio Preto, Sao Paulo State (Brazil); Santos Torres, Ulysses dos; Portela de Oliveira, Eduardo; Soares Souza, Antonio [Sao Jose do Rio Preto Medical School, Department of Radiology, Hospital de Base, Sao Paulo, State (Brazil)

2010-12-15

325

Perianal disease in pediatric Crohn disease: a review of MRI findings.  

Science.gov (United States)

Perianal complications of Crohn disease are a common occurrence in children and can result in significant morbidity when not accurately characterized prior to surgical intervention. MRI is an excellent imaging modality for the evaluation of perianal inflammatory bowel disease - allowing characterization and detailed description of perianal fistulas. MRI has many advantages over other imaging modalities for the pediatric patient. Radiologists will benefit from a sophisticated understanding of perianal anatomy, the classification of perianal fistulas, the advantages MRI offers in characterization of perianal fistulas as well as the common and incidental findings that are important in the MRI evaluation of perianal inflammatory bowel disease in children. Perianal fistulas are found at a high rate in pediatric referrals and are more commonly found in male patients. PMID:25246189

Compton, Gregory L; Bartlett, Murray

2014-10-01

326

MRI findings in an infant with vaccine-associated paralytic poliomyelitis  

International Nuclear Information System (INIS)

Although acute flaccid paralysis is a manifestation observed in several neurologic and muscular disorders, vaccine-associated paralytic poliomyelitis (VAPP) is an exceedingly rare etiology. In the clinical setting of acute flaccid paralysis, MRI is useful in differentiating between VAPP and other conditions. Additionally, MRI can assess the extent of lesions. However, reports on MRI findings in VAPP are scarce in the pediatric radiology literature. We report a Brazilian infant who developed VAPP 40 days after receiving the first dose of oral polio vaccine (OPV). MR images of the cervical and thoracic spinal cord showed lesions involving the anterior horn cell, with increased signal intensity on T2-weighted sequences. We would like to emphasize the importance of considering VAPP as a differential diagnosis in patients with acute flaccid paralysis and an MRI showing involvement of medulla oblongata or spinal cord, particularly in countries where OPV is extensively administered. (orig.)

327

Perianal disease in pediatric Crohn disease: a review of MRI findings  

International Nuclear Information System (INIS)

Perianal complications of Crohn disease are a common occurrence in children and can result in significant morbidity when not accurately characterized prior to surgical intervention. MRI is an excellent imaging modality for the evaluation of perianal inflammatory bowel disease - allowing characterization and detailed description of perianal fistulas. MRI has many advantages over other imaging modalities for the pediatric patient. Radiologists will benefit from a sophisticated understanding of perianal anatomy, the classification of perianal fistulas, the advantages MRI offers in characterization of perianal fistulas as well as the common and incidental findings that are important in the MRI evaluation of perianal inflammatory bowel disease in children. Perianal fistulas are found at a high rate in pediatric referrals and are more commonly found in male patients. (orig.)

328

Perianal disease in pediatric Crohn disease: a review of MRI findings  

Energy Technology Data Exchange (ETDEWEB)

Perianal complications of Crohn disease are a common occurrence in children and can result in significant morbidity when not accurately characterized prior to surgical intervention. MRI is an excellent imaging modality for the evaluation of perianal inflammatory bowel disease - allowing characterization and detailed description of perianal fistulas. MRI has many advantages over other imaging modalities for the pediatric patient. Radiologists will benefit from a sophisticated understanding of perianal anatomy, the classification of perianal fistulas, the advantages MRI offers in characterization of perianal fistulas as well as the common and incidental findings that are important in the MRI evaluation of perianal inflammatory bowel disease in children. Perianal fistulas are found at a high rate in pediatric referrals and are more commonly found in male patients. (orig.)

Compton, Gregory L.; Bartlett, Murray [Royal Children' s Hospital, Medical Imaging Department, Parkville, Victoria (Australia)

2014-10-15

329

CORRELATION OF PAIN AND DISABILITY WITH MRI FINDINGS IN PATIENTS WITH LUMBAR DISCOGENIC BACK PAIN  

Directory of Open Access Journals (Sweden)

Full Text Available Background: Lumbar disc prolapse is one of the common causes of low back pain seen in the working population. There are contradictorty reports regarding the clinical significance of various magnetic resonance imaging (MRI findings observed in these patients. Purpose: The aim of the study was to determine the association of magnetic resonance imaging (MRI findings with intensity of pain and self reported disability among persons with lumbar discogenic back pain. Material And Methods: A consecutive series of patients aged between 20 – 50 years, who were investigated by MRI of lumbar spine because of LBP(Low Back Pain were selected.LBP intensity was measured by using Numerical Pain Rating Scale (NPRS and functional disability by Modified Oswestry Disability Questionnaire (MODI. Each MRI scan was assessed and graded by radiologist according to standardized protocol. Results: The Pearson’s correlation coefficient for pain intensity on NPRS (r value = -0.01614 and disability percentage ( r value =-0.5628 in discogenic back pain patients demonstrated negative correlation. Conclusion: Our findings suggest that there is no association of MRI findings in the lumbar spine with intensity of pain and disability among persons with lumbar discogenic back pain.

Surendra K. Wani

2014-04-01

330

CT and MRI findings in patients with suprasellar germ cell tumors  

International Nuclear Information System (INIS)

This is a retrospective analysis of CT and MRI findings in suprasellar germ cell tumors. The study population was comprised of 6 patients with germinomas, one with embryonal carcinoma, and one with mature teratoma. Suprasellar germinoma tended to have intratumoral low density on CT or intensity area on MRI, indicating tumor necrosis or occasionally cyst formation. Germinoma tissue may extend into the pituitary fossa. Sagittal MRI revealed that the extension was limited to the posterior part of the pituitary gland. MRI of the teratoma did not demonstrate extension of the tumor into the pituitary fossa. No germ cell tumor in this region was seen as calcification. Germinoma in this region did not always show marked homogeneous enhancement. These neuroradiological findings failed to determine subtypes of germ cell tumors. Two patients had germinomas in both the pineal and suprasellar areas. Two years after the total removal of pineal teratoma, it recurred in the suprasellar region that was not seen on the first MRI. In these two patients, germinomas called 'double midline tumors' seemed to have originated by CSF dissemination or subependymal seeding, which was not demonstrated on neuroradiological images. The teratoma case was thought to be one form of double midline tumor, because the first tumor tissue in the pineal region had been totally and extracapsulary removed two years earlier and the suprasellar lesion could not be demonstrated on sagittal MRI or CT scans. In costrated on sagittal MRI or CT scans. In conclusion, not only neuroradiological findings but also clinical findings such as tumor markers may be required in preoperative diagnosis of suprasellar germ cell tumors. (N.K.)

331

MRI findings and correlation with pathological features in breast phyllodes tumor  

International Nuclear Information System (INIS)

Objective: To study the MR Imaging features of breast phyllodes tumor (PT), and to correlate it with pathological results. Method: Clinical and MRI findings were retrospectively reviewed in twenty-seven women with 28 PTs lesions confirmed by surgical pathology. Statistical analyses were one-way ANOVA for size analysis, Fisher exact test for analysis of MR appearances and Spearman correlation to study the relationship between MRI findings and BI-RADS categories. Results: (1) The histologic findings were benign, borderline and malignant PTs in 14.3% (4/28), 53.6% (15/28) and 32.1% (9/28) of lesions, respectively. (2) The mean maximum-diameter were (6.4±3.9) cm, (5.7±2.2) cm in borderline type and (4.8±1.8) cm in benign type respectively. The results showed differences in lesion's size among the three type (F= 287.541, P=0.000), especially between malignant and benign type (P=0.033). (3) Internal non-enhanced septation and silt-like changes on enhanced images, as well as time-signal curve on MRI correlated significantly with the histological grade (P<0.05). (4) If the category BI-RADS ? 4a was considered to be a suspicious sign for malignant lesion, the diagnostic accuracy of MRI would be 96.4% (27/28), and the BI-RADS category of the MRI could reflect the PT's histological grade with a low correlation coefficient (r=0.382, P=0.045). Conclusion: The findings of PT on MRI have some characteristics, with tumor size and several MRI features correlating with the histological grade of breast PT. (authors)

332

Whole-heart cine MRI in a single breath-hold. A compressed sensing accelerated 3D acquisition technique for assessment of cardiac function  

Energy Technology Data Exchange (ETDEWEB)

Purpose: The aim of this study was to perform functional MR imaging of the whole heart in a single breath-hold using an undersampled 3 D trajectory for data acquisition in combination with compressed sensing for image reconstruction. Materials and Methods: Measurements were performed using an SSFP sequence on a 3 T whole-body system equipped with a 32-channel body array coil. A 3 D radial stack-of-stars sampling scheme was utilized enabling efficient undersampling of the k-space and thereby accelerating data acquisition. Compressed sensing was applied for the reconstruction of the missing data. A validation study was performed based on a fully sampled dataset acquired by standard Cartesian cine imaging of 2 D slices on a healthy volunteer. The results were investigated with regard to systematic errors and resolution losses possibly introduced by the developed reconstruction. Subsequently, the proposed technique was applied for in-vivo functional cardiac imaging of the whole heart in a single breath-hold of 27 s. The developed technique was tested on three healthy volunteers to examine its reproducibility. Results: By means of the results of the simulation (temporal resolution: 47 ms, spatial resolution: 1.4 x 1.4 x 8 mm, 3 D image matrix: 208 x 208 x 10), an overall acceleration factor of 10 has been found where the compressed sensing reconstructed image series shows only very low systematic errors and a slight in-plane resolution loss of 15 %. The results of the in-vivo study (temporal resolution: 40.5 ms, spatial resolution: 2.1 x 2.1 x 8 mm, 3 D image matrix: 224 x 224 x 12) performed with an acceleration factor of 10.7 confirm the overall good image quality of the presented technique for undersampled acquisitions. Conclusion: The combination of 3 D radial data acquisition and model-based compressed sensing reconstruction allows high acceleration factors enabling cardiac functional imaging of the whole heart within only one breath-hold. The image quality in the simulated dataset and the in-vivo measurement highlights the great potential of the presented technique for an efficient assessment of cardiac functional parameters. (orig.)

Wech, T.; Koestler, H. [Wuerzburg Univ. (Germany). Inst. of Radiology; Wuerzburg Univ. (Germany). Comprehensive Heart Failure Center; Pickl, W.; Tran-Gia, J.; Ritter, C.; Hahn, D. [Wuerzburg Univ. (Germany). Inst. of Radiology; Beer, M. [Wuerzburg Univ. (Germany). Inst. of Radiology; Graz Univ. (Austria). University Hospital Radiology

2014-01-15

333

Whole-heart cine MRI in a single breath-hold. A compressed sensing accelerated 3D acquisition technique for assessment of cardiac function  

International Nuclear Information System (INIS)

Purpose: The aim of this study was to perform functional MR imaging of the whole heart in a single breath-hold using an undersampled 3 D trajectory for data acquisition in combination with compressed sensing for image reconstruction. Materials and Methods: Measurements were performed using an SSFP sequence on a 3 T whole-body system equipped with a 32-channel body array coil. A 3 D radial stack-of-stars sampling scheme was utilized enabling efficient undersampling of the k-space and thereby accelerating data acquisition. Compressed sensing was applied for the reconstruction of the missing data. A validation study was performed based on a fully sampled dataset acquired by standard Cartesian cine imaging of 2 D slices on a healthy volunteer. The results were investigated with regard to systematic errors and resolution losses possibly introduced by the developed reconstruction. Subsequently, the proposed technique was applied for in-vivo functional cardiac imaging of the whole heart in a single breath-hold of 27 s. The developed technique was tested on three healthy volunteers to examine its reproducibility. Results: By means of the results of the simulation (temporal resolution: 47 ms, spatial resolution: 1.4 x 1.4 x 8 mm, 3 D image matrix: 208 x 208 x 10), an overall acceleration factor of 10 has been found where the compressed sensing reconstructed image series shows only very low systematic errors and a slight in-plane resolution loss of 15 %. The results of the in-vivo study (temporal resolution: 40.5 ms, spatial resolution: 2.1 x 2.1 x 8 mm, 3 D image matrix: 224 x 224 x 12) performed with an acceleration factor of 10.7 confirm the overall good image quality of the presented technique for undersampled acquisitions. Conclusion: The combination of 3 D radial data acquisition and model-based compressed sensing reconstruction allows high acceleration factors enabling cardiac functional imaging of the whole heart within only one breath-hold. The image quality in the simulated dataset and the in-vivo measurement highlights the great potential of the presented technique for an efficient assessment of cardiac functional parameters. (orig.)

334

Intracranial hypotension: the nonspecific nature of MRI findings.  

Science.gov (United States)

We present three patients who complained of postural headache related to different types of intracranial hypotension: spontaneous or primary, and secondary, but presenting the same findings on brain magnetic resonance imaging. Diffuse pachymeningeal gadolinium enhancement supports the belief that the enhancement is a nonspecific meningeal reaction to low pressure. PMID:11135032

Bruera, O C; Bonamico, L; Giglio, J A; Sinay, V; Leston, J A; Figuerola, M L

2000-01-01

335

Chest wall invasion by peripheral lung cancer. Preoperative assessment with respiratory dynamic MRI  

International Nuclear Information System (INIS)

The purpose of our study was to evaluate the usefulness of dynamic cine MRI during respiration in the assessment of chest wall invasion by lung cancer. We prospectively performed respiratory dynamic MRI in 34 patients with peripheral lung cancer, in whom the presence of chest wall invasion was indeterminate on CT. Sequential images were obtained during respiration by using fast spoiled GRASS (spoiled gradient recalled acquisition in the steady state (SPGR)) sequence, and were analyzed in cine mode display. In all 23 patients with free movement of the tumor along the chest wall on respiratory dynamic cine MRI, no chest wall invasion was found at surgery (negative predictive value 100%). In eleven patients with fixation of the tumor to the chest wall, invasion was confirmed pathologically in five patients, while benign fibrous adhesion was found in six. Although it has some limitations, dynamic cine MRI during respiration is useful in evaluating chest wall invasion in patients with lung cancer, particularly when CT findings are indeterminate. (author)

336

Incidental findings at MRI-enterography in patients with suspected or known Crohn’s disease  

Directory of Open Access Journals (Sweden)

Full Text Available AIM: To determine the frequency and clinical impact of incidental findings detected with magnetic resonance imaging (MRI-enterography in patients with suspected or known Crohn’s disease (CD.METHODS: Incidental findings were defined as unexpected lesions outside the small intestine, not previously known or suspected at the time of referral, and not related to inflammatory bowel disease. Through a systematic review of medical charts we analyzed the clinical impact of incidental findings, and compared the MRI findings with subsequent diagnostic procedures.RESULTS: A total of 283 patients were included in the analysis, and MRI detected active CD in 31%, fistula in 1.4% and abscess in 0.7%. Extra-intestinal findings not related to CD were recorded in 72 patients (25%, of which 58 patients (20% had 74 previously unknown lesions. Important or incompletely characterized findings were detected in 17 patients (6.0%. Incidental findings led to 12 further interventions in 9 patients (3.2% revealing previously unknown pathological conditions in 5 (1.8%. One patient (0.4% underwent surgery and one patient was diagnosed with a malignant disease. MRI detected incidental colonic lesions in 16 patients of which additional work-up in 4 revealed normal anatomy. Two patients (0.7% benefitted from the additional examinations, whereas incidental findings led to unnecessary examinations in 9 (3.2%.CONCLUSION: In a minority of patients with suspected or known CD, important incidental findings are diagnosed at MRI-enterography. However, a substantial number of patients experience unnecessary morbidity because of additional examinations of benign or normal conditions.

Michael Dam Jensen, Torben Nathan, Jens Kjeldsen, Søren Rafael Rafaelsen

2010-01-01

337

Evaluation of MRI findings in non-specific inflammatory processes in the parasellar region  

Energy Technology Data Exchange (ETDEWEB)

We report the MRI findings on 6 patients with a non-specific inflammatory process in the parasellar region. Ophthalmoplegia developed in all patients. Only two patients complained of boring pain behind the eye and one of mild headache. The other three patients did not complain of pain. MRI clearly showed the extent of the lesions. In two patients the lesion was localized in the cavernous sinus. In the other patients, the lesions extended to the orbital apex, intrasellar and suprasellar regions, infratemporal fossa, or other neighboring regions beyond the cavernous sinus. The signal intensity of the lesions on T[sub 2]WI was variable. The lesions were significantly enhanced after administration of Gd-DTPA. They were non-homogeneously enhanced in some patients. In three patients the lesions were well enhanced on the initial MRI scans. However, they were less enhanced on subsequent follow-up MRI or CT. The signal intensity and the degree of enhancement may vary substantially during the evolution of the inflammatory process or by blood flow in the cavernous sinus. Painful ophthalmoplegia is encountered in diseases of diverse pathogenesis in which the signal intensity and the extent of the lesions are variable. The MRI findings in one patient were not different from those of perineural spread from extracranial lesions, especially the one in the nasopharynx. However, MRI showed no abnormality in the nasopharynx and the base of the skull. In this patient, the clinical symptoms and MRI findings improved spontaneously. In some patients, the clinical symptoms and the extent of the pathological process were different from those in the classic Tolosa-Hunt syndrome. It could be suggested that the spectrum of non-specific inflammatory processes in the parasellar region is wider than the criteria for classic Tolosa-Hunt syndrome. (J.N.M.).

Nishihara, Mamiko; Takeda, Keiko (Niigata Univ. (Japan). School of Medicine); Ito, Jusuke; Okamoto, Kouichirou; Tokiguchi, Susumu

1994-06-01

338

Evaluation of MRI findings in non-specific inflammatory processes in the parasellar region  

International Nuclear Information System (INIS)

We report the MRI findings on 6 patients with a non-specific inflammatory process in the parasellar region. Ophthalmoplegia developed in all patients. Only two patients complained of boring pain behind the eye and one of mild headache. The other three patients did not complain of pain. MRI clearly showed the extent of the lesions. In two patients the lesion was localized in the cavernous sinus. In the other patients, the lesions extended to the orbital apex, intrasellar and suprasellar regions, infratemporal fossa, or other neighboring regions beyond the cavernous sinus. The signal intensity of the lesions on T2WI was variable. The lesions were significantly enhanced after administration of Gd-DTPA. They were non-homogeneously enhanced in some patients. In three patients the lesions were well enhanced on the initial MRI scans. However, they were less enhanced on subsequent follow-up MRI or CT. The signal intensity and the degree of enhancement may vary substantially during the evolution of the inflammatory process or by blood flow in the cavernous sinus. Painful ophthalmoplegia is encountered in diseases of diverse pathogenesis in which the signal intensity and the extent of the lesions are variable. The MRI findings in one patient were not different from those of perineural spread from extracranial lesions, especially the one in the nasopharynx. However, MRI showed no abnormality in the nasopharynx and the base of the skull. In this patient, the clinical sthe skull. In this patient, the clinical symptoms and MRI findings improved spontaneously. In some patients, the clinical symptoms and the extent of the pathological process were different from those in the classic Tolosa-Hunt syndrome. It could be suggested that the spectrum of non-specific inflammatory processes in the parasellar region is wider than the criteria for classic Tolosa-Hunt syndrome. (J.N.M.)

339

Correlation between the outcome of extracorporeal shockwave therapy and pretreatment MRI findings for chronic plantar fasciitis.  

Science.gov (United States)

Background. The purpose of this study was to investigate the relationship between magnetic resonance imaging (MRI) findings before extracorporeal shockwave therapy (ESWT) and the treatment outcome of ESWT. Methods. This study examined 50 feet with chronic plantar fasciitis. The scores before ESWT and after a six-month follow-up were investigated using the Japanese Society for Surgery of the Foot (JSSF) Ankle-Hindfoot Scale and the Visual Analog Scale (VAS). MRI before ESWT was used for image evaluation. MRI revealed thickening of the plantar fascia (PF), and an investigation was conducted regarding the findings of a high-signal-intensity area (HSIA) inside the PF, edema near the PF, and bone marrow edema (BME) of the calcaneus. Results. The average JSSF score and VAS score improved significantly at follow-up. In total, 44 feet were noted in the improved group. MRI revealed that the average amounts of PF thickening did not significantly differ between the improved group and the non-improved group. HSIA, edema near the PF, and BME were observed in 36, 41, and 11 feet in the improved group, respectively; and 2, 4, and 2 feet in the non-improved group, respectively. Conclusions. An HSIA in the PF predicted symptom improvement more easily than other MRI findings. Level of Evidence: IV. PMID:25401230

Maki, Masahiro; Ikoma, Kazuya; Imai, Kan; Kido, Masamitsu; Hara, Yusuke; Arai, Yuji; Fujiwara, Hiroyoshi; Kubo, Toshikazu

2014-11-17

340

The accommodation of EMG and MRI findings in patients with radicular low back pain  

Directory of Open Access Journals (Sweden)

Full Text Available "nBackground: There are multiple diagnostic methods for evaluation of patients with low back pain with a radicular pattern, each one has it's own accuracy and diagnostic ability and so comparing them with each other would help the clinicians to find the best diagnostic method. The main objective of our study was to compare the diagnostic accommodation of electromyography (EMG and Magnetic Resonance Imaging (MRI findings in patients with low back pain and radiculopathy. "n"nMethods: In this descriptive cross-sectional study, 101 patients with low back pain and radiculopathy attending to Sina Hospital in Tehran, Iran from 2007 to 2009 that had indication for both EMG and MRI were evaluated for their demographic characteristics and disease-related factors. "n"nResults: Totally, 90 out of 101 patients (89% had abnormal EMG findings and 94 out of 101 subjects (93% had abnormal MRI results. The concordance rate was 88% (89 patients with no significant difference (p> 0.05. The sensitivity and specificity of MRI were 95.6% and 27.3%, respectively, and the sensitivity and specificity of EMG were 91.5% and 60%, respectively. "n"nConclusion: According to the results of this study and in comparison with other studies it may be concluded that MRI and EMG are both accurate and use of them in a concomitant manner would result in increased diagnostic ability in patients with low back pain and radiculopathy.

Koushan A

2010-08-01

 
 
 
 
341

Spinal MRI Findings of Guillain-Barré Syndrome  

Directory of Open Access Journals (Sweden)

Full Text Available

Guillain-Barré syndrome is a relatively common, acute, and rapidly progressive, inflammatory demyelinating polyneuropathy. The diagnosis is usually established on the basis of symptoms and signs, aided by cerebrospinal fluid findings and electrophysiologic criteria. Previously, radiologic examinations have been used only to rule out other spinal abnormalities. We report a case of systemic lupus erythematosus associated with Guillain-Barré syndrome with marked enhancement of nerve roots of the conus medullaris and cauda equina on MR imaging. These MR observations may help confirm the diagnosis of Guillain-Barré syndrome.

Ozlem Alkan

2009-03-01

342

MRI findings of malignant lymphoma presenting in bones  

Energy Technology Data Exchange (ETDEWEB)

To analyze the MR finding of skeletal malignant lymphoma. The authors retrospectively reviewed the MR imaging findings (location, signal intensity and contrastenhancement of lesions, and patterns of bone marrow involvement) of 12 patients with malignant lymphoma presenting in bones and confirmed by incisional biopsy, blind bone marrow biopsy or follow-up MR imaging. Among the 15 lesions in 12 patients, the spine was the most commonly involved site (n=3D5), followed by the ilium (n=3D4), femur (n=3D3), sternum (n=3D2), titia (n=3D1). On T1-weighted images, lesions showed signal intensity close to muscle, while on T2-weighted images, involved bones showed variable signal intensity from muscle to water signal intensity. Patterns of bone marrow involvement were nodular (n=3D2), diffuse (n=3D5), or segmental (n=3D8). All cases of segmental bone marrow involvement also produced soft tissue mass. In two cases in which this occurred, cortical breakdown was not noted. On T1- and T2-weighted MR images, particularly the latter, bone marrow involvement of malignant lymphoma was observed, with variable signal intensity. Contrast enhanced images revealed distinct lesion. Patterns of bone marrow involvement varied. (author)

Moon, Sungwook; Cho, Jeamin; Suh, Jin Suck [College of Medicine, Yonsei University, Seoul (Korea, Republic of); Ha, Doohoe [CHA General Hospital, College of Medicine, Pochon CHA University, Seoul (Korea, Republic of)

2000-02-01

343

MRI findings in patients with defecatory dysfunction after surgical correction of anorectal malformation  

International Nuclear Information System (INIS)

Postoperative anorectal malformation patients frequently have defecatory dysfunction. MRI may be useful in the management of these patients. To analyze static and dynamic MRI findings in patients with defecatory dysfunction after correction of anorectal malformation (ARM), and compare differences between patients with constipation and fecal incontinence. Pelvic MRI studies of 20 constipated and 32 incontinent postoperative ARM patients were analyzed retrospectively to determine the location and morphology of the neorectum, presence of peritoneal fat herniation, presence of scarring, development of the striated muscle complex (SMC) and any other abnormalities. The two groups were then compared using ? 2-test. Eighteen patients also underwent MRI defecography to evaluate pelvic floor function and abnormalities are reported. The children with incontinence were more likely to have abnormal location of the neorectum (P = 0.031), increased anorectal angle (ARA) (P = 0.031) and peritoneal fat herniation (P = 0.032), and less likely to have dilation of the neorectum (P = 0.027), than the children with constipation. There were no significant differences between the two groups in incidence of focal stenosis of the neorectum (P = 0.797), presence of extensive scarring (P = 0.591) and developmental agenesis of the SMC (P > 0.05). MRI defecography showed 6 anterior rectoceles, 6 cystoceles and 18 pelvic floor descents. MRI is a helpful imaging modality in postoperativehelpful imaging modality in postoperative ARM patients with defecatory dysfunction, and it shows distinct differences between the children with constipation and incontinence and provides individualized information to guide further treatment. (orig.)

344

MRI findings in patients with defecatory dysfunction after surgical correction of anorectal malformation  

Energy Technology Data Exchange (ETDEWEB)

Postoperative anorectal malformation patients frequently have defecatory dysfunction. MRI may be useful in the management of these patients. To analyze static and dynamic MRI findings in patients with defecatory dysfunction after correction of anorectal malformation (ARM), and compare differences between patients with constipation and fecal incontinence. Pelvic MRI studies of 20 constipated and 32 incontinent postoperative ARM patients were analyzed retrospectively to determine the location and morphology of the neorectum, presence of peritoneal fat herniation, presence of scarring, development of the striated muscle complex (SMC) and any other abnormalities. The two groups were then compared using {chi} {sup 2}-test. Eighteen patients also underwent MRI defecography to evaluate pelvic floor function and abnormalities are reported. The children with incontinence were more likely to have abnormal location of the neorectum (P = 0.031), increased anorectal angle (ARA) (P = 0.031) and peritoneal fat herniation (P = 0.032), and less likely to have dilation of the neorectum (P = 0.027), than the children with constipation. There were no significant differences between the two groups in incidence of focal stenosis of the neorectum (P = 0.797), presence of extensive scarring (P = 0.591) and developmental agenesis of the SMC (P > 0.05). MRI defecography showed 6 anterior rectoceles, 6 cystoceles and 18 pelvic floor descents. MRI is a helpful imaging modality in postoperative ARM patients with defecatory dysfunction, and it shows distinct differences between the children with constipation and incontinence and provides individualized information to guide further treatment. (orig.)

Cui, Yong; Shao, Guang-rui [Second Hospital of Shandong University, Department of Radiology, Jinan (China); Wang, Ruo-yi [Second Hospital of Shandong University, Department of Pediatric Surgery, Jinan (China); Zhang, Yuan [Second Hospital of Shandong University, Evidence-based Medical Center, Jinan (China); Zhang, Shu-hui [Second Hospital of Shandong University, Department of Laboratory, Jinan (China)

2013-08-15

345

MRI  

Medline Plus

Full Text Available Magnetic Resonance Imaging Scan (MRI) Introduction An MRI scan, or magnetic resonance imaging scan, is a test that provides very clear pictures of structures inside the body. Doctors may recommend an MRI ...

346

MRI  

Medline Plus

Full Text Available Magnetic Resonance Imaging Scan (MRI) Introduction An MRI scan, or magnetic resonance imaging scan, is a test that provides very ... and risks of this procedure. Test A Magnetic Resonance Imaging scan, known as an MRI scan or ...

347

CT and MRI findings of cystadenofibromas of the ovary  

Energy Technology Data Exchange (ETDEWEB)

The aim of this study was to assess imaging findings on CT or MR images of histologically proven ovarian cystadenofibromas. In the period 1995-2001, 32 histologically proven ovarian cystadenofibromas were identified in 28 women. Of the 32 ovarian cystadenofibromas, 16 tumors were purely cystic and the remaining 16 were complex cystic on CT or MR images. Solid components of 16 complex cystic tumors were seen as nodular (n=8) or trabecular (n=9) solid areas. One tumor had both nodular and trabecular solid components. Among 16 complex cystic tumors, 14 had thick or irregular septa; thus, half of ovarian cystadenofibromas had morphological imaging features of malignancy on CT or MR images. On histology, solid components in the cystic tumors were correlated with fibrous stromas that occasionally made a false-positive result for malignancy on imaging. (orig.)

Cho, Song-Mee; Byun, Jae Young; Rha, Sung Eun; Jung, Seung Eun; Jung, Na Young; Lee, Jae Mun [Department of Radiology, College of Medicine, The Catholic University of Korea, 505 Banpo-Dong, Seocho-Gu, Seoul (Korea); Park, Gyeong Sin; Kim, Byung Kee [Department of Pathology, College of Medicine, The Catholic University of Korea, 505 Banpo-Dong, Seocho-Gu, Seoul (Korea); Kim, Bohyun [Department of Radiology, Sungkyunkwan University School of Medicine, Samsung Medical Center, 50 Ilwon-Dong, Kangnam-Gu, Seoul (Korea); Cho, Kyoung-Sik [Department of Radiology, University of Ulsan College of Medicine, Asan Medical Center, 388-1 Poongnap-Dong, Songpa-Gu, Seoul (Korea); Kim, Seung Hyup [Department of Radiology, College of Medicine, Seoul National University, 28 Yongon-Dong, Chongno-Gu, Seoul (Korea)

2004-05-01

348

CT and MRI findings of cystadenofibromas of the ovary  

International Nuclear Information System (INIS)

The aim of this study was to assess imaging findings on CT or MR images of histologically proven ovarian cystadenofibromas. In the period 1995-2001, 32 histologically proven ovarian cystadenofibromas were identified in 28 women. Of the 32 ovarian cystadenofibromas, 16 tumors were purely cystic and the remaining 16 were complex cystic on CT or MR images. Solid components of 16 complex cystic tumors were seen as nodular (n=8) or trabecular (n=9) solid areas. One tumor had both nodular and trabecular solid components. Among 16 complex cystic tumors, 14 had thick or irregular septa; thus, half of ovarian cystadenofibromas had morphological imaging features of malignancy on CT or MR images. On histology, solid components in the cystic tumors were correlated with fibrous stromas that occasionally made a false-positive result for malignancy on imaging. (orig.)

349

Meningiomas with conventional MRI findings resembling intraaxial tumors: can perfusion-weighted MRI be helpful in differentiation?  

International Nuclear Information System (INIS)

To investigate the contribution of perfusion-weighted MRI to the differentiation of meningiomas with atypical conventional MRI findings from intraaxial tumors. We retrospectively analyzed 54 meningiomas, 12 glioblastomas and 13 solitary metastases. We detected 6 meningiomas with atypical features on conventional MRI resembling intraaxial tumors. The regional cerebral blood flow (rCBV) ratios of all tumors were calculated via perfusion-weighted MRI. The signal intensity-time curves were plotted and three different curve patterns were observed. The type 1 curve resembled normal brain parenchyma or the postenhancement part was minimally below the baseline, the type 2 curve was similar to the type 1 curve but with the postenhancement part above the baseline, and the type 3 curve had the postenhancement part below the baseline accompanied by widening of the curve. Student's t-test was used for statistical analysis. On CBV images meningiomas were hypervascular and the mean rCBV ratio was 10.58±2.00. For glioblastomas and metastatic lesions, the rCBV ratios were 5.02±1.40 and 4.68±1.54, respectively. There was a statistically significant difference in rCBV ratios between meningiomas and glioblastomas and metastases (P<0.001). Only one of the meningiomas displayed a type 2 curve while five showed a type 3 curve. Glioblastomas and metastases displayed either a type 1 or a type 2 curve. None of the meningiomas showed a type 1 curve and none of the glioblastomas or metastasesnone of the glioblastomas or metastases showed a type 3 curve. (orig.)

350

CineGlob  

CERN Multimedia

CERN will be hosting the next CineGlobe International Film Festival from March 18 to 23 at the Globe of Science and Innovation with the theme “Beyond the Frontier”, This 4th edition will see 66 short films “inspired by science” in competition, including fiction films as well as documentaries. From Tuesday the 18th to Friday the 21st, special lunch sessions are organized from 12:30 to 13:30. Food will be available for purchase at the tent “Café Cinéma” next to the Globe. Special evenings While the short film screenings are the heart of the festival, every year CineGlobe also organizes compelling special events every night, from feature films to special musical performances: Tuesday 18th: The Swiss premiere of the acclaimed documentary film Particle Fever. Presented by BBC Storyville with Fabiola Gianotti and director Mark Levinson in attendance; Wednesday 19th: The result of the “Story Matter” Hacka...

CineGlob

2014-01-01

351

Inflammatory myofibroblastic tumour of the maxillary sinus: CT and MRI findings  

International Nuclear Information System (INIS)

Aim: To characterize the computed tomography (CT) and magnetic resonance imaging (MRI) findings of inflammatory myofibroblastic tumours (IMTs) of the maxillary sinus. Materials and methods: The imaging findings of eight patients with IMTs of the maxillary sinus were reviewed retrospectively. Of the eight patients, four patients underwent unenhanced and contrast-enhanced CT, and one patient underwent unenhanced CT only; three patients underwent unenhanced and contrast-enhanced MRI. Results: Five cases of IMTs occurred in the left maxillary sinus, while three cases were right-sided. Four cases occupied the entire sinus, and the other four cases only partially occupied the sinus. Unenhanced CT images showed heterogeneous masses in four cases and a homogeneous mass in one case. One of the tumours showed some areas of calcification. T1-weighted MRI images showed isointense lesions. T2-weighted images showed mixed isointense and mild hyperintense lesions. All cases showed bone destruction and had infiltrated into the nasal fossa, orbit, infratemporal fossa, and other adjacent tissues. Seven cases showed mild to moderate heterogeneous enhancement on contrast-enhanced CT or T1-weighted MRI images. Conclusion: IMTs of the maxillary sinus can be characterized as a soft-tissue mass with bony destruction and infiltration of the adjacent tissues, with mild to moderate enhancement after the injection of contrast medium. CT and MRI can help to diagnose IMTs, determine the extent of to diagnose IMTs, determine the extent of the lesion and its relationship with adjacent tissues, and thus facilitate the prediction of surgical resectability.

352

Localized hypertrophic neuropathy of the sciatic nerve in children: MRI findings  

International Nuclear Information System (INIS)

Localized hypertrophic neuropathy (LHN) of the sciatic nerve in children is a rare condition characterized by a painless neurological deficit in the sciatic nerve territory. To demonstrate the role of MRI using a specific protocol and describe the primary findings in LHN. Imaging in four children (age 2 years to 12 years) is presented. All children presented with lower limb asymmetry. Three had a steppage gait. LHN was confirmed by electrophysiological studies and by MRI of the whole sciatic nerve with a dedicated protocol covering the lumbar spine and the lower limb. There were four direct MRI findings: (1) linear and focal hypertrophy with progressive enlargement of a peripheral nerve or plexus diameter, (2) abnormal hyperintensity of the nerve on T2-weighted images, (3) preserved fascicular configuration, and (4) variable enhancement after intravenous gadolinium administration. In addition there were atrophy and fatty infiltration of innervated muscles. MRI was helpful for determining the extent of lesions and in excluding peripheral nerve compression or tumour. MRI of the whole sciatic nerve is the method of choice for diagnosing LHN of the sciatic nerve. (orig.)

353

MRI findings of pancreatic lymphoma and autoimmune pancreatitis: A comparative study  

Energy Technology Data Exchange (ETDEWEB)

Purpose: To clarify whether there are differences in MRI findings between pancreatic lymphomas and autoimmune pancreatitis (AIP). Materials and methods: MRI of 8 patients with pancreatic lymphomas and 21 patients with AIP were retrospectively reviewed. For multifocal pancreatic lymphomas (n = 2) and AIP (n = 4), the largest 2 lesions were evaluated. Ten pancreatic lymphomas and 25 AIP were compared on three bases: the signal intensity on T2-weighted images, internal homogeneity, and presence or absence of capsule-like rim. In 8 lymphomas and 19 AIP, the enhancement pattern on dynamic MRI was compared, as well. Results: On T2-weighted images, pancreatic lymphomas comprised 5, 5 and 4 lesions with low (iso), slightly high, and moderately high intensity, respectively, while the numbers for AIP were 14, 10, and 1 (P < 0.01). Nine of 10 (90%) lymphomas appeared homogenous, and 11 of 25 (44%) AIP were homogenous (P < 0.05). A capsule-like rim was present in 9 of 25 (36%) AIP, but was not seen in lymphomas (P < 0.05). On dynamic MRI, 18 of 19 (94.7%) AIP showed persistent (n = 5) or delayed enhancement (n = 13), and 6 of 8 (75%) lymphomas showed low intensity without delayed enhancement (P < 0.001). Conclusion: MRI findings for pancreatic lymphomas and AIP were significantly different, which may be helpful for the differential diagnosis of these two diseases.

Ishigami, Kousei, E-mail: Ishigamikousei@aol.co [Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582 (Japan); Tajima, Tsuyoshi; Nishie, Akihiro; Ushijima, Yasuhiro [Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582 (Japan); Fujita, Nobuhiro [Department of Anatomic Pathology, Graduate School of Medical Sciences, Kyushu University (Japan); Asayama, Yoshiki; Kakihara, Daisuke; Irie, Hiroyuki [Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582 (Japan); Ito, Tetsuhide; Igarashi, Hisato [Department of Medicine and Bioregulatory Science, Graduate School of Medical Sciences, Kyushu University (Japan); Nakamura, Masafumi [Department of Surgery and Oncology, Graduate School of Medical Sciences, Kyushu University (Japan); Honda, Hiroshi [Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582 (Japan)

2010-06-15

354

MRI findings of pancreatic lymphoma and autoimmune pancreatitis: A comparative study  

International Nuclear Information System (INIS)

Purpose: To clarify whether there are differences in MRI findings between pancreatic lymphomas and autoimmune pancreatitis (AIP). Materials and methods: MRI of 8 patients with pancreatic lymphomas and 21 patients with AIP were retrospectively reviewed. For multifocal pancreatic lymphomas (n = 2) and AIP (n = 4), the largest 2 lesions were evaluated. Ten pancreatic lymphomas and 25 AIP were compared on three bases: the signal intensity on T2-weighted images, internal homogeneity, and presence or absence of capsule-like rim. In 8 lymphomas and 19 AIP, the enhancement pattern on dynamic MRI was compared, as well. Results: On T2-weighted images, pancreatic lymphomas comprised 5, 5 and 4 lesions with low (iso), slightly high, and moderately high intensity, respectively, while the numbers for AIP were 14, 10, and 1 (P < 0.01). Nine of 10 (90%) lymphomas appeared homogenous, and 11 of 25 (44%) AIP were homogenous (P < 0.05). A capsule-like rim was present in 9 of 25 (36%) AIP, but was not seen in lymphomas (P < 0.05). On dynamic MRI, 18 of 19 (94.7%) AIP showed persistent (n = 5) or delayed enhancement (n = 13), and 6 of 8 (75%) lymphomas showed low intensity without delayed enhancement (P < 0.001). Conclusion: MRI findings for pancreatic lymphomas and AIP were significantly different, which may be helpful for the differential diagnosis of these two diseases.

355

Localized hypertrophic neuropathy of the sciatic nerve in children: MRI findings  

Energy Technology Data Exchange (ETDEWEB)

Localized hypertrophic neuropathy (LHN) of the sciatic nerve in children is a rare condition characterized by a painless neurological deficit in the sciatic nerve territory. To demonstrate the role of MRI using a specific protocol and describe the primary findings in LHN. Imaging in four children (age 2 years to 12 years) is presented. All children presented with lower limb asymmetry. Three had a steppage gait. LHN was confirmed by electrophysiological studies and by MRI of the whole sciatic nerve with a dedicated protocol covering the lumbar spine and the lower limb. There were four direct MRI findings: (1) linear and focal hypertrophy with progressive enlargement of a peripheral nerve or plexus diameter, (2) abnormal hyperintensity of the nerve on T2-weighted images, (3) preserved fascicular configuration, and (4) variable enhancement after intravenous gadolinium administration. In addition there were atrophy and fatty infiltration of innervated muscles. MRI was helpful for determining the extent of lesions and in excluding peripheral nerve compression or tumour. MRI of the whole sciatic nerve is the method of choice for diagnosing LHN of the sciatic nerve. (orig.)

Roux, Adrien; Treguier, Catherine; Bruneau, Bertrand; Marin, Franck; Gandon, Yves; Gauvrit, Jean-Yves [University Hospital, Department of Radiology, Hopital Sud, 16 Boulevard de Bulgarie, BP 90347, Rennes cedex 2 (France); Riffaud, Laurent [University Hospital, Department of Pediatric Neurosurgery, Hopital Sud, Rennes (France); Violas, Philippe [University Hospital, Department of Pediatric Surgery, Hopital Sud, Rennes (France); Michel, Anne [University Hospital, Department of Neurological Functional Explorations, Hopital Sud, Rennes (France)

2012-08-15

356

Hepatic Angiomyolipoma: Dual-Contrast MRI Findings Using Superparamagnetic Iron Oxide (SPIO) and Gadolinium Agents  

International Nuclear Information System (INIS)

To analyze imaging findings of hepatic angiomyolipomas (AMLs) on dualcontrast MRI using superparamagnetic iron oxide (SPIO) and gadolinium (Gd) agents. Five histopathologically-proven hepatic AMLs were enrolled in this study. Patients underwent dual-contrast MRI using SPIO and Gd agents on a 3.0T unit and performed a qualitative analysis consisting of measuring the signal intensity (SI) of the lesion, presence of fat, hemorrhage, early draining vein, tortuous tumoral vessels, as well as capsule and enhancement patterns. The signal drop of the lesion on post-SPIO images was also assessed. For the quantitative analysis, relative signal decrease (RSD, %) was calculated. The presence of fat was noted in three lesions. An early draining vein and prominent tortous tumoral vessels were depicted in four lesions. No lesion was found to have a capsule. Four lesions showed early wash-in and early wash-out enhancement patterns, while the remaining lesion depicted strong and persistent enhancement. On post-SPIO images, signal drop was noted in the two lesions with no fat within the lesion. Their RSD was 21.1% and 38.0%, respectively. The presence of an early draining vein and tortuous tumoral vessels are characteristic dynamic enhanced MRI features of hepatic AMLs. In fat-deficient hepatic AMLs, the combination of dynamic enhanced MRI and SPIO-enhanced MRI might findings might increase the accuracy of making a correct diagnosis

357

Hepatic Angiomyolipoma: Dual-Contrast MRI Findings Using Superparamagnetic Iron Oxide (SPIO) and Gadolinium Agents  

Energy Technology Data Exchange (ETDEWEB)

To analyze imaging findings of hepatic angiomyolipomas (AMLs) on dualcontrast MRI using superparamagnetic iron oxide (SPIO) and gadolinium (Gd) agents. Five histopathologically-proven hepatic AMLs were enrolled in this study. Patients underwent dual-contrast MRI using SPIO and Gd agents on a 3.0T unit and performed a qualitative analysis consisting of measuring the signal intensity (SI) of the lesion, presence of fat, hemorrhage, early draining vein, tortuous tumoral vessels, as well as capsule and enhancement patterns. The signal drop of the lesion on post-SPIO images was also assessed. For the quantitative analysis, relative signal decrease (RSD, %) was calculated. The presence of fat was noted in three lesions. An early draining vein and prominent tortous tumoral vessels were depicted in four lesions. No lesion was found to have a capsule. Four lesions showed early wash-in and early wash-out enhancement patterns, while the remaining lesion depicted strong and persistent enhancement. On post-SPIO images, signal drop was noted in the two lesions with no fat within the lesion. Their RSD was 21.1% and 38.0%, respectively. The presence of an early draining vein and tortuous tumoral vessels are characteristic dynamic enhanced MRI features of hepatic AMLs. In fat-deficient hepatic AMLs, the combination of dynamic enhanced MRI and SPIO-enhanced MRI might findings might increase the accuracy of making a correct diagnosis

Kim, Min Uk; Kim, Se Hyung; Kim, Hyo Cheol; Lee, Jae Young; Kim, Min A; Han, Joon Koo; Choi, Byung Ihn [Seoul National University Hospital College of Medicine, Seoul (Korea, Republic of)

2010-12-15

358

MRI Findings of Extramedullary Hematopoiesis in the Thoracic and Lumbosacral Spine in Patients with Thalassaemia  

Directory of Open Access Journals (Sweden)

Full Text Available Background/Objective: Extramedullary hematopoiesis (EMH is a rare but well-known compensatory mechanism of red blood cell production when the normal site of red bone marrow is unable to produce sufficient number of red blood cells. When the body demand for erythrocyte cells is high, it leads to EMH. Patients with hemoglobinopathies are more likely to have EMH in paraosseous locations. The aim of our study was to evaluate MRI findings of extramedullary hematopoiesis in the thoracic and lumbosacral spine in patients with thalassaemia"nPatients and Methods: A total of 42 patients between 16 to 44 years with thalassaemia intermedia (22 cases and major (20 cases who referred to MRI center of Sari in North of Iran were studied using MRI technique. "nThe patients had thoracic or low back pain or paresthesia and progressive paraparesia and paraplegia. Axial, coronal and Sagital MRI scans were obtained from thoracic and lumbosacral spine in all patients."nResults: In 35 patients, EMH masses were detected in the paraspinal area and in 22 subjects the masses were intraspinal vertebral canal in thoracic region. Soft tissue masses were observed in sacral canal, (mostly lower than S2 level, in 21 cases, the condition was also noted in paravertebral location in 26 patients. "nConclusion: Based on our findings, the sacral spine should be closely examined by using MRI.

R. Adibi

2008-01-01

359

Clinical, MRI and perfusion SPECT findings in strategic infarct dementia  

International Nuclear Information System (INIS)

Strategic infarct dementia (SID) is characterized by focal ischemic lesions involving specific sites that are critical for higher cortical functions. The mechanism of SID are not well understood. We evaluate lesion sites, neuropsychiatric symptoms, brain perfusion SPECT and neuropsychological findings in patients with SID. Eleven patients with SID according to NINDS-AIREN criteria for vascular dementia were included. All patients performed brain MR and MRA, Tc-99m HMPAO brain perfusion SPECT. Various sites were responsible for SID; thalamus(n=3), medial temporal lobe(n=3), medial frontal lobe(n=1), genu of internal capsule(n=1), caudate nucleus(n=1), angular gyrus(n=1) and temporooccipital lobe(n=1). The most common neuropsychiatric symptoms were apathy and indifference by K-NPI. Brain perfusion SPECT revealed ipsilateral cortical hypoperfusion, mainly in frontal and temporal lobe area, in patients with subcortical strategic infarct. On neuropsychological assessment, cognitive deficits on attention and frontal executive function were prominent. The thalamus and medial temporal lobe were the most common sites responsible for SID. It was suggested that strategic disruption of frontal-subcortical circuit be an important role to produce SID in patients with subcortical strategic lesions

360

Brain MRI findings in two cases with eclampsia  

International Nuclear Information System (INIS)

Neurological complications in patients with eclampsia are varied and include headache, visual disturbances, focal neurological deficits, altered mental status and coma. Occasionally, a focal neurological deficit includes a variety of visual disturbances. The pathophysiology of CNS abnormalities in patients with eclampsia is uncertain. Our cases, combined with a review of the literature, demonstrate that there is no correlation among severity of hypertension, parity, and location of lesions at initial magnetic resonance (MR) imaging findings or between the severity of hypertension and neurological symptoms. Two typical patterns are seen on MR images of patients with eclampsia. Lesions in the region of the posterior cerebral circulation are most common and are frequently associated with visual disturbances. Although there are lesions in the deep white matter or basal ganglia, a focal neurological deficit or alterations in mental status may not develop. This demonstrates the sensitivity of MR imaging in the detection of abnormalities in patients with eclampsia, even those without neurological deficits. 13 refs., 1 tab., 2 figs

 
 
 
 
361

MRI findings of ovarian tumors : differentiation of benign from malignant lesions  

International Nuclear Information System (INIS)

To evaluate the usefulness of MRI findings in the differentiation of benign from malignant ovarian lesions. Using MR findings, 29 surgically proven ovarian masses in 22 patients (14 bilateral tumors) were evaluated Twenty-one benign tumors in 16 patients(5 simple cysts, 4 mucinous cystadenomas, 4 serous cystadenomas, 4 endometriomas, 3 cystic teratomas and 1 tuboovarian abscess), and eight malignant tumors in six patients(4 serous papillary cystadenocarcinomas and 4 mucinous cystadenocarcinomas) were included. MRI was performed with SE T1WI, FSE T2WI and Gd-T1WI. MRI findings of lesion size, thickness of wall and of internal septations, number of internal septations, nodularities, and ancillary findings such as adhesion in the pelvic cavity, dissemination, ascites and 1ymphadenopathy were retrospectively analyzed. Malignant ovarian lesions were larger(18cm : 11cm) and had more internal septations, more solid components and nodularities(63% : 5%) than benign lesions. On T1WI, cystic lesions, both benign and malignant, showed low signal intensity. Hemorrhage, fat components and mucin containing lesions showed high signals and solid components and nodularities were isointense with muscle on T1WI. Solid components and nodularities were well-enhanced after gadolinium enhancement. Adhesion(50% : 10%), dissemination(38% : 0%) and ascites(63% : 24%) were more frequent in malignant lesions. MRI, especially with gadolinium-enhanced T1WI is useful in the differentiation of benig is useful in the differentiation of benign from malignant ovarian lesions

362

MRI findings of an intermuscular lipoma in a 2-year-old  

Energy Technology Data Exchange (ETDEWEB)

We report the MRI findings of a large deep intermuscular lipoma in a 2-year-old child with a painless palpable shoulder mass, and its differentiation from liposarcoma and other soft-tissue masses. To our knowledge, the imaging features of deep lipomas in children have not been reported. (orig.)

Grandbois, Lindsey; Vade, Aruna; Lim-Dunham, Jennifer [Loyola University Medical Center, Department of Radiology, Maywood, IL (United States); Al-Masri, Hytham [Mount Sinai Hospital, Department of Pathology, Chicago, IL (United States)

2006-09-15

363

Pituitary duplication and nasopharyngeal teratoma in a newborn: CT, MRI, US and correlative histopathological findings  

Energy Technology Data Exchange (ETDEWEB)

The computed tomography and MRI imaging findings in a case of pituitary duplication and epipharyngeal teratoma are described in a newborn baby girl with respiratory difficulties. Associated skull base and central nervous system malformations are presented. Teratoma diagnosis was confirmed by histology. The embryological pathogenesis is discussed. (orig.)

Huisman, Thierry A.G.M.; Straube, Torsten [University Children' s Hospital Zurich, Department of Diagnostic Imaging, Zurich (Switzerland); Fischer, Ursin; Gysin, Claudine [University Children' s Hospital Zurich, Division of Ear, Nose and Throat Surgery, Zurich (Switzerland); Boltshauser, Eugen [University Children' s Hospital Zurich, Department of Neurology, Zurich (Switzerland)

2005-07-01

364

Pituitary duplication and nasopharyngeal teratoma in a newborn: CT, MRI, US and correlative histopathological findings  

International Nuclear Information System (INIS)

The computed tomography and MRI imaging findings in a case of pituitary duplication and epipharyngeal teratoma are described in a newborn baby girl with respiratory difficulties. Associated skull base and central ner