1.Absence of the Intrahepatic Inferior Vena Cava with Polysplenia Syndrome on Multidetector Computed Tomography: A Case Report
Journal of the Korean Radiological Society 2019;80(6):1271-1275
Various anomalies of the inferior vena cava (IVC) can arise from a failure in the normal embryogenic processes. Agenesis of the intrahepatic segment of the IVC with azygos continuation, which is caused by failure of formation of the right subcardinal–hepatic anastomosis, is a rare IVC anomaly. In this paper, we report a case of interrupted IVC with azygos vein continuation, combined with polysplenia, intestinal malrotation, and truncated pancreas, which was incidentally found on abdominal CT and thoracic aorta CT angiography.
2.High-Altitude Cerebral Edema Evaluated with MRI: A Case Report
Sungjun HWANG ; Byung Hoon LEE ; Yoon Joon HWANG ; Jin Woo KIM
Journal of the Korean Radiological Society 2019;80(6):1247-1252
High-altitude cerebral edema (HACE) is a rare life-threatening condition observed in individuals who climb high altitudes. This report describes the case of a 38-year-old man who recently climbed a 5000-m-high mountain, showing the following radiologic findings at 3 different anatomical locations: 1) increased T2 signal intensity (SI) without restricted diffusion, with full recovery in the posterior limb of the left internal capsule; 2) increased T2 SI with restricted diffusion, with full recovery in the splenium of the corpus callosum; and 3) increased T2 SI with restricted diffusion and microbleeds, resulting in bilateral encephalomalacia in the globus pallidus. Herein, we report the concurrent typical and atypical radiologic findings of this rare condition caused by vasogenic and cytotoxic edema.
3.Mucosa-Associated Lymphoid Tissue Lymphoma of the Cheek Mimicking Benign Entities: a Case Report
Hyun HWANG ; Jae Ho SHIN ; Yon Kwon IHN ; Sungjun HAN ; Hong Sik PARK
Investigative Magnetic Resonance Imaging 2021;25(2):129-134
The prevalence of cheek lymphoma, especially a mucosa-associated lymphoid tissue lymphoma (MALT), is very rare. Non-specific symptoms and image findings of cheek lymphoma may mimic benign entities and make it difficult to diagnose. In this case report, we present a case of MALT lymphoma of the cheek mimicking benign entities on computed tomography and magnetic resonance imaging.
4.Mucosa-Associated Lymphoid Tissue Lymphoma of the Cheek Mimicking Benign Entities: a Case Report
Hyun HWANG ; Jae Ho SHIN ; Yon Kwon IHN ; Sungjun HAN ; Hong Sik PARK
Investigative Magnetic Resonance Imaging 2021;25(2):129-134
The prevalence of cheek lymphoma, especially a mucosa-associated lymphoid tissue lymphoma (MALT), is very rare. Non-specific symptoms and image findings of cheek lymphoma may mimic benign entities and make it difficult to diagnose. In this case report, we present a case of MALT lymphoma of the cheek mimicking benign entities on computed tomography and magnetic resonance imaging.
5.Lower Leg MRI Features in Axonal Charcot-Marie-Tooth Patients with MFN2 Mutations.
Bum Chun SUH ; Dong Suk SHIM ; Jeeyoung OH ; Sang Beom KIM ; Sungjun KIM ; Ki Wha CHUNG ; Jung Hee HWANG ; Kee Duk PARK ; Seung Min KIM ; Il Nam SUNWOO ; Byung Ok CHOI
Journal of the Korean Neurological Association 2007;25(1):23-32
BACKGROUND: Mutations in mitofusin2 (MFN2) are a major underlying cause of axonal Charcot-Marie-Tooth neuropathy (CMT). It has been reported that patients with an early age of onset (<10 years, EO) show more severe clinical phenotypes than those of patients with a later age at onset (> or =10 years, LO) in CMT2A with MFN2 mutations. There are few studies about CMT patients with MRI studies and we performed leg MRIs for better understanding of CMT2A. METHODS: We identified 19 patients (EO=10; LO=9) with MFN2 mutations. We used functional disability scales and CMT neuropathy scales for the grading of disability. Nerve conduction studies and MRIs of the lower leg were performed in all patients. RESULTS: We confirmed that EO had more severe leg muscle involvement than LO by leg MRI. In 7 out of 9 in LO, there were some degree of asymmetric leg muscle weakness and MRI findings explained the nature of asymmetry, that is, asymmetric cross-sectional areas or fatty infiltration. MRI of EO showed marked fatty infiltration on all three compartments whereas that of LO showed rather selective involvement of the posterior compartment. These results were well correlated with clinical findings that in LO, five patients could not do toe walking whereas only one could not do heel walking. CONCLUSIONS: MRI of the leg may be a useful tool for evaluating axonal CMT neuropathy, and asymmetric leg muscle weakness may be the characteristics of an axonal CMT. In addition, more prominent involvement of the posterior leg in LO is a very interesting phenomenon, which is in contrast to the length-dependent involvement in congenital demyelinating neuropathy.
Age of Onset
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Axons*
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Charcot-Marie-Tooth Disease
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Heel
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Humans
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Leg*
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Magnetic Resonance Imaging*
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Muscle Weakness
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Neural Conduction
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Phenotype
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Toes
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Walking
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Weights and Measures
6.Interobserver and Test-Retest Reproducibility of T1ρ and T2 Measurements of Lumbar Intervertebral Discs by 3T Magnetic Resonance Imaging.
Yeon Hwa YOO ; Choon Sik YOON ; Na Lae EUN ; Moon Jung HWANG ; Hanna YOO ; Robert D PETERS ; Tae Sub CHUNG ; Young Han LEE ; Jin Suck SUH ; Sungjun KIM
Korean Journal of Radiology 2016;17(6):903-911
OBJECTIVE: To investigate the interobserver and test-retest reproducibility of T1ρ and T2 measurements of lumbar intervertebral discs using 3T magnetic resonance imaging (MRI). MATERIALS AND METHODS: This study included a total of 51 volunteers (female, 26; male, 25; mean age, 54 ± 16.3 years) who underwent lumbar spine MRI with a 3.0 T scanner. Amongst these subjects, 40 underwent repeat T1ρ and T2 measurement acquisitions with identical image protocol. Two observers independently performed the region of interest measurements in the nuclei pulposi of the discs from L1–2 through L5–S1 levels. Statistical analysis was performed using intraclass correlation coefficient (ICC) with a two-way random model of absolute agreement. Comparison of the ICC values was done after acquisition of ICC values using Z test. Statistical significance was defined as p value < 0.05. RESULTS: The ICCs of interobserver reproducibility were 0.951 and 0.672 for T1ρ and T2 mapping, respectively. The ICCs of test-retest reproducibility (40 subjects) for T1ρ and T2 measurements were 0.922 and 0.617 for observer A and 0.914 and 0.628 for observer B, respectively. In the comparison of the aforementioned ICCs, ICCs of interobserver and test-retest reproducibility for T1ρ mapping were significantly higher than T2 mapping (p < 0.001). CONCLUSION: The interobserver and test-retest reproducibility of T1ρ mapping were significantly higher than those of T2 mapping for the quantitative assessment of nuclei pulposi of lumbar intervertebral discs.
Humans
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Intervertebral Disc Degeneration
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Intervertebral Disc*
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Magnetic Resonance Imaging*
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Male
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Spine
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Volunteers