Journal Detail Information

1

Cite

Share

Ancient Schwannoma of the Thigh mimicking a Plexiform Malignant Peripheral Nerve Sheath Tumor: A Case Report.

Yeon Soo LEE ; Sang Eun PARK ; Jung Uee LEE

Journal of the Korean Society of Magnetic Resonance in Medicine.2011;15(2):170-175. doi:10.13104/jksmrm.2011.15.2.170

Ancient schwannoma is a rare variant of schwannoma and a slow growing benign tumor associated with degeneration that may be diagnosed as a malignant tumor, because it presents with a large size and an inhomogeneous signal intensity. The main differential diagnosis of plexiform soft tissue tumor includes plexiform neurofibroma, malignant peripheral nerve sheath tumor (MPNST). In this case, we describe the MRI findings in a case of ancient schwannoma involving left thigh of a 63-year-old woman mimicking a plexiform MPNST. The tumor appeared as an inhomogeneous signal intensity and multinodular appearance, causing misdiagnosis as a plexiform MPNST.
Diagnosis, Differential ; Diagnostic Errors ; Female ; Humans ; Middle Aged ; Nerve Sheath Neoplasms ; Neurilemmoma ; Neurofibroma, Plexiform ; Peripheral Nerves ; Thigh

2

Cite

Share

Delayed Cerebral Metastases from Completely Resected Cardiac Myxoma: Case Report and Review of Literature.

Ah Hyun KIM ; Jae Wook LEE ; Mi Kyung LEE ; Pyeong Ho YOON ; Min Jung KIM

Journal of the Korean Society of Magnetic Resonance in Medicine.2011;15(2):165-169. doi:10.13104/jksmrm.2011.15.2.165

Cardiac myxoma is the most common benign tumor of the heart. However, low incidence of recurrence and metastasis has been reported. A 49-year-old female patient was admitted in the hospital due to sudden onset of left side weakness. Magnetic resonance imaging (MRI) of brain showed multifocal areas of diffusion restriction on diffusion weighted images. Echocardiography was performed to evaluate the cause of embolic brain infarction and cardiac myxoma was found in the left atrium. The patient underwent complete excision of the mass. One year later, the patient was readmitted with symptoms of dysarthria. Brain MRI showed newly developed multiple hemorrhagic metastatic lesions. The patient underwent radiotherapy of the metastatic lesions. Although rare, cardiac myxoma can cause delayed metastasis. We report a rare case of delayed multiple cerebral metastases from the completely resected cardiac myxoma.
Brain ; Brain Infarction ; Diffusion ; Dysarthria ; Echocardiography ; Female ; Heart ; Heart Atria ; Humans ; Incidence ; Magnetic Resonance Imaging ; Middle Aged ; Myxoma ; Neoplasm Metastasis ; Recurrence

3

Cite

Share

Image Findings of Primary Squamous Cell Carcinoma of the Pancreas in Patient with Chronic Pancreatitis: A Case Report.

Jong Bum KIM ; Mi Young KIM ; Chang Hae SUH ; Kun Young LEE ; Young Chae JOO ; Jae Young CHO

Journal of the Korean Society of Magnetic Resonance in Medicine.2011;15(2):160-164. doi:10.13104/jksmrm.2011.15.2.160

Squamous cell carcinoma of the pancreas is a rare, uncommon tumor that is characterized by squamous metaplasia of the ductal columnar cells. We report the image findings of a rare case of the pancreatic squamous cell carcinoma associated with chronic pancreatitis.
Carcinoma, Squamous Cell ; Humans ; Metaplasia ; Pancreas ; Pancreatitis, Chronic

4

Cite

Share

Testicular Epidermoid Cyst on Diffusion-Weighted MR Imaging and ADC Map : A Case Report.

Mi Sun KIM ; Kyung Ah KIM ; Sun Hee CHANG

Journal of the Korean Society of Magnetic Resonance in Medicine.2011;15(2):154-159. doi:10.13104/jksmrm.2011.15.2.154

Testicular epidermoid cyst is a rare benign tumor, accounting for 1-2% of all testicular tumors. It can be cured by organ preserving surgery, so accurate preoperative diagnosis is very important for preventing unneccessary and extensive orchiectomy. We experienced a case of an 18-year-old man who presented with a painless lump in his right testis. The testicular mass showed an onion ring sign on ultrasonography. Computed tomography images showed the mass as a low attenuating lesion with curvilinear calcification. On Magnetic resonance imaging (MRI), the mass appeared as high signal intensity with internal alternating low signal intensity patterns on T2-weighted images. The mass was displayed as having homogeneous high signal intensity on diffusion magnetic resonance imaging and showed lower apparent diffusion coefficient values than normal testis parenchyma, similar to intracranial epidermoid cysts. Testicular MRI with DWI and ADC map can help to more accurately diagnose testicular epidermoid cyst.
Accounting ; Adolescent ; Diffusion ; Diffusion Magnetic Resonance Imaging ; Epidermal Cyst ; Humans ; Magnetic Resonance Imaging ; Onions ; Orchiectomy ; Testicular Neoplasms ; Testis

5

Cite

Share

Female External Genitalia and Urethra on MR Imaging: Optimal Pulse Sequence and Comparison of Anatomy in Premenopausal and Postmenopausal Women.

Shin Young WHANG ; Kyung Sik AHN ; Deuk Jae SUNG ; Beom Jin PARK ; Min Ju KIM ; Sung Bum CHO ; Nam Joon LEE

Journal of the Korean Society of Magnetic Resonance in Medicine.2011;15(2):146-153. doi:10.13104/jksmrm.2011.15.2.146

PURPOSE: To describe normal anatomy and compare the differences of external genital organs and urethra on MR imaging in pre- and postmenopausal women. MATERIALS AND METHODS: A total of 19 pre- and 18 postmenopausal healthy women underwent pelvis MR imaging at 1.5 T. Two radiologists retrospectively scored and compared the image quality of female external genitalia and urethra on axial T2-weighted images (T2WI) and axial fat-suppressed contrast-enhanced T1-weighted images (FSCE-T1WI) by using Wilcoxon signed ranks test. The radiologists compared the wall thickness or size of external genital organs and urethra on FSCE-T1WI between two groups by using Student t test. RESULTS: Image quality was better with FSCE-T1WI than with T2WI in all subjects (p < 0.05). The vestibular bulb, clitoris and labium minor were more clearly visualized on FSCE-T1WI in premenopausal subjects rather than in postmenopausal subjects (p < 0.05). The urethra had a target-like appearance with three layers in premenopausal and postmenopausal subjects. Postmenopausal subjects were observed to have significantly smaller vaginal wall thickness, urethral wall thickness and vestibular bulb width than premenopausal subjects (p < 0.05). CONCLUSION: The anatomy and morphologic changes of female external genital organs and urethra were well discernible on FSCE-T1WI.
Clitoris ; Female ; Genitalia ; Humans ; Pelvis ; Retrospective Studies ; Urethra

6

Cite

Share

Acute Adverse Reactions to Gadolinium-based Intravenous Contrast Agents for MRI : Retrospective Analysis Using Computed Reporting System.

Moon Hyung CHOI ; Joon Il CHOI ; Seung Eun JUNG ; Kook Jin AHN ; Hae Giu LEE

Journal of the Korean Society of Magnetic Resonance in Medicine.2011;15(2):139-145. doi:10.13104/jksmrm.2011.15.2.139

PURPOSE: To assess the frequency and severity of acute adverse reactions to intravenous administration of gadolinium-based contrast agents using computerized reporting system at a single large academic institution. MATERIALS AND METHODS: We assessed data from electronic hospital information system from October 2008 to December 2010. Reactions were classified as mild, moderate, or severe. We compared the frequency of adverse reactions among three contrast agents (Gd-BT-DO3A, Gd-DTPA and Gd-EOB-DTPA). RESULTS: The total number of administrated contrast agents was 33,600, and the number of administration of Gd-BT-DO3A, Gd-DTPA and Gd-EOB-DTPA were 20,824 (62%), 10,417 (31%) and 2,359 (7%), respectively. Total 39 adverse reactions were reported accounting for 0.1161% of all administrations. The incidences of adverse reactions were 0.1248% (26/39, 67%) for Gd-BT-DO3A, 0.0768% (8/39, 21%) for Gd-DTPA, and 0.2120% (5/39, 13%) for Gd-EOB-DTPA. The difference of frequencies of adverse reaction among three contrast agents was not significant. Most cases of the adverse effect were mild (35/39, 89.7%). Moderate and severe adverse reactions were encountered in two patients, respectively. CONCLUSION: Among Koreans, adverse effects were rare, and especially, moderate to severe adverse reactions were much rarer. There was no difference among the frequencies of adverse reactions caused by three different contrast agents.
Accounting ; Administration, Intravenous ; Contrast Media ; Electronics ; Electrons ; Gadolinium DTPA ; Hospital Information Systems ; Humans ; Incidence ; Retrospective Studies

7

Cite

Share

Functional MRI of Language: Difference of its Activated Areas and Lateralization according to the Input Modality.

Jae Wook RYOO ; Jae Min CHO ; Ho Chul CHOI ; Mi Jung PARK ; Hye Young CHOI ; Ji Eun KIM ; Heon HAN ; Sam Soo KIM ; Yong Hwan JEON ; Hyun Soo KHANG

Journal of the Korean Society of Magnetic Resonance in Medicine.2011;15(2):130-138. doi:10.13104/jksmrm.2011.15.2.130

PURPOSE: To compare fMRIs of visual and auditory word generation tasks, and to evaluate the difference of its activated areas and lateralization according to the mode of stimuli. MATERIALS AND METHODS: Eight male normal volunteers were included and all were right handed. Functional maps were obtained during auditory and visual word generation tasks in all. Normalized group analysis were performed in each task and the threshold for significance was set at p<0.05. Activated areas in each task were compared visually and statistically. RESULTS: In both tasks, left dominant activations were demonstrated and were more lateralized in visual task. Both frontal lobes (Broca's area, premotor area, and SMA) and left posterior middle temporal gyrus were activated in both tasks. Extensive bilateral temporal activations were noted in auditory task. Both occipital and parietal activations were demonstrated in visual task. CONCLUSION: Modality independent areas could be interpreted as a core area of language function. Modality specific areas may be associated with processing of stimuli. Visual task induced more lateralized activation and could be a more useful in language study than auditory task.
Brain ; Frontal Lobe ; Hand ; Humans ; Magnetic Resonance Imaging ; Male

8

Cite

Share

Follow-Up MR Imaging Assessment of Natural History of Lumbar Disc Herniation in Patients with Recurred Low Back Pain.

Kyung Mi LEE ; Ji Seon PARK ; Kyung Nam RYU ; So Young PARK ; Wook JIN

Journal of the Korean Society of Magnetic Resonance in Medicine.2011;15(2):123-129. doi:10.13104/jksmrm.2011.15.2.123

PURPOSE: To compare lumbar disc changes between initial lumbar spine (L-spine) MRI and follow-up (f/u) MRI that were performed due to recurred backaches. MATERIALS AND METHODS: A total 50 patients who had undergone f/u L-spine MRI were retrospectively reviewed. Five discs (L1-S1) were surveyed in each f/u MRI. Lumbar disc changes were defined as no change, aggravations, or improvements compared to initial disc states. These states were defined on the basis of morphologic status and disc levels. RESULTS: In a total of 250 discs in 50 patients, 31 discs (12.4%) showed morphologic changes of disc lesions, whereas 219 discs (87.6 %) showed no changes. Among the 31 disc lesions, 24 were aggravated and 7 were partially improved. And on the basis of disc status, initially abnormal discs revealed any morphologic changes of the degree of disc herniation. A total of 33.3% of the morphologic changes are noted in initially extruded discs. Fifteen morphologic changes of disc lesions were located at the L4-5 level. CONCLUSION: Our results suggest that correlations between lumbar disc herniations and back pain symptoms are limited, and that evaluations of extra disc lesions are required.
Back Pain ; Follow-Up Studies ; Humans ; Intervertebral Disc ; Low Back Pain ; Natural History ; Retrospective Studies ; Spine

9

Cite

Share

Anatomical Brain Connectivity Map of Korean Children.

MinHee UM ; Bumhee PARK ; Hae Jeong PARK

Journal of the Korean Society of Magnetic Resonance in Medicine.2011;15(2):110-122. doi:10.13104/jksmrm.2011.15.2.110

PURPOSE: The purpose of this study is to establish the method generating human brain anatomical connectivity from Korean children and evaluating the network topological properties using small-world network analysis. MATERIALS AND METHODS: Using diffusion tensor images (DTI) and parcellation maps of structural MRIs acquired from twelve healthy Korean children, we generated a brain structural connectivity matrix for individual. We applied one sample t-test to the connectivity maps to derive a representative anatomical connectivity for the group. By spatially normalizing the white matter bundles of participants into a template standard space, we obtained the anatomical brain network model. Network properties including clustering coefficient, characteristic path length, and global/local efficiency were also calculated. RESULTS: We found that the structural connectivity of Korean children group preserves the small-world properties. The anatomical connectivity map obtained in this study showed that children group had higher intra-hemispheric connectivity than inter-hemispheric connectivity. We also observed that the neural connectivity of the group is high between brain stem and motorsensory areas. CONCLUSION: We suggested a method to examine the anatomical brain network of Korean children group. The proposed method can be used to evaluate the efficiency of anatomical brain networks in people with disease.
Brain ; Brain Stem ; Child ; Diffusion ; Humans

10

Cite

Share

Pre-operative Evaluation of Consistency in Intra-axial Brain Tumor with Diffusion-weighted Images (DWI) and Conventional MR Images.

Moon Sik OH ; Kook Jin AHN ; Hyun Seok CHOI ; So Lyung JUNG ; Yoon Joo LEE ; Bum Soo KIM

Journal of the Korean Society of Magnetic Resonance in Medicine.2011;15(2):102-109. doi:10.13104/jksmrm.2011.15.2.102

PURPOSE: To retrospectively evaluate the usefulness of diffusion-weighted images, ADC maps and conventional MR images for determination of brain tumor consistency. MATERIALS AND METHODS: Twenty-three patients with brain tumor underwent MR examinations with T1, T2 and diffusion-weighted images. Regions of interest (ROIs) were drawn in the tumors, and the measured signal intensities (SI) were normalized with the contralateral side. We evaluated the correlation between SI ratios from various images and tumor consistency assessed at surgery. In three patients with both cystic and solid components, each component was evaluated independently. Qualitatively observed SIs were also correlated with tumor consistency. RESULTS: Statistical analysis revealed significant correlation between tumor consistency and ADC ratio (r = -0.586, p = 0.002), SI ratios on T2-weighted images (r = -0.497, p = 0.010), and observed SIs on T2-weighted images (r = -0.461, p = 0.018). The relative ratio of ADC value correlated with tumor consistency most strongly. CONCLUSION: The measured ratio of ADC, SI ratio and observed SI grade on T2-weighted images can provide valuable information about the consistency of brain tumor.
Brain ; Brain Neoplasms ; Humans ; Retrospective Studies

DISPLAY OPTIONS

Cite

Share

Cite

Share

Cite

Share

Cite

Share

Cite

Share

Cite

Share

Cite

Share

Cite

Share

Cite

Share

Cite

Share