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JYMS : Journal of Yeungnam Medical Science

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Jay Chun Chang 6 Articles
Nonsegmental Abnormal Arterial Attenuation : Transient Hyperperfusion of the Peripheral Zone of the Liver on Arterial Dominant Phase
Won Kyu Park, Jay Chun Chang, Jae Woon Kim
Yeungnam Univ J Med. 2007;24(2 Suppl):S310-318.   Published online December 31, 2007
DOI: https://doi.org/10.12701/yujm.2007.24.2S.S310
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AbstractAbstract PDF
Purpose:This study was done to arrange the cases showing temporally hyperperfusion in the periphery of the liver, to check the etiology and mechanism, and to find out the new radiologic role on diffuse liver disease. Materials and Methods:We reviewed 12 cases of showing transient arterial hyperperfusion in the just peripheral portion of the liver on the arterial dominant phase on dynamic CT and the absence of abnormal perfusion between central and peripheral portion on tissue equilibrium phase. We retrospectively analyzed final diagnosis and the presence of main portal vein thrombi, and cavernous transformation.
Results
:Final diagnosis in 12 cases was as follows: diffuse liver disease was in seven cases, pancreatitis in three and pyogenic portal thrombosis in two. Main portal vein thrombosis were detected all cases of pancreatitis and pyogenic portal thrombosis. In seven diffuse liver disease, two cases shown thrombosed, two cases shown normal and the other cases are collapsed. Cavernous transformation was in three cases of pancreatitis and two of diffuse liver disease.
Conclusion
:We think that the causes of this phenomenon maybe as follows: the difference of the hemodynamic compensation mechanism between central and peripheral zone of the liver, presence of microscopic thrombi in peripheral portal branch which cannot be detected by imaging technique, hypercoagulability in portal area, the systematic destruction of terminal portal branch and the development of ectopic portal pathway.
A Case of Reversed Intestinal Rotation
Won Kyu Park, Jae Ho Cho, Jay Chun Chang, Jae Woon Kim, Mi Soo Hwang
Yeungnam Univ J Med. 2007;24(2 Suppl):S632-635.   Published online December 31, 2007
DOI: https://doi.org/10.12701/yujm.2007.24.2S.S632
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AbstractAbstract PDF
Diagnosis and treatment of a patient with a congenital anomaly of the midgut with persistent symptom in adult can be difficult because it is particularly in adults. Reversed rotation of the midgut is the rarest of all malrotation anomalies. We report a case of reversed intestinal rotation and review the embryology, clinical presentation, and radiographic findings of this disorder. Although this anomaly is rare, it may be diagnosed by the knowledge of embryology and anatomy.
Cystic Dystrophy in Heterotopic Pancreas of Duodenal Wall -A Case Report-
Mi Jin Gu, Won Kyu Park, Yeung Kyong Bae, Jae Ho Cho, Jay Chun Chang, Jae Woon Kim, Kil Ho Cho, Mi Soo Hwang, Bok Hwan Park, Joon Hyuk Choi
Yeungnam Univ J Med. 2007;24(2 Suppl):S647-651.   Published online December 31, 2007
DOI: https://doi.org/10.12701/yujm.2007.24.2S.S647
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Cystic dystrophy is an uncommon, benign poorly understood disease. It is characterized by the development of cysts in heterotopic pancreatic tissue. A 57-year-old-man was hospitalized for abdominal pain for a week. He is a heavy alcohol drinker. There was a cyst at second portion of duodenum on CT. Under the impression of peptic ulcer perforation, Whipple’s operation was performed. Grossly, a cystic space, measuring 3.0 cm in diameter, was noted within the thickened duodenal wall. Microscopically, the cyst was lined by columnar epithelium and granulation tissue and embedded in ectopic pancreatic tissue. The adjacent pancreatic tissue showed focal chronic pancreatitis.
Desmoplastic Small Round Cell Tumor: A Case Report.
Joon Hyuk Choi, Sung Soo Yun, Jay Chun Chang
Yeungnam Univ J Med. 2006;23(1):90-95.   Published online June 30, 2006
DOI: https://doi.org/10.12701/yujm.2006.23.1.90
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Desmoplastic small round cell tumor (DSRCT) is a rare and highly malignant mesenchymal tumor found in the abdominal cavity. It mainly affects young male patients. We report a case of DSRCT that occurred in the abdominal cavity of a 50-year-old man. The tumor was characterized by small round tumor cells with irregular nests in the prominent desmoplastic stroma. The tumor cells showed immunoreactivity for epithelial membrane antigen, desmin, vimentin, and neuron specific enolase.
MR Imaging of Uterine Malignant Mixed Mullerian Tumor: Comparison with Endometrial Carcinoma.
Jae Ho Cho, Jeen Woo Kim, Jay Chun Chang, Bok Hwan Park, Jung Sik Kim
Yeungnam Univ J Med. 1999;16(2):296-301.   Published online December 31, 1999
DOI: https://doi.org/10.12701/yujm.1999.16.2.296
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AbstractAbstract PDF
BACKGROUND
Generally, it is difficult to differentiate uterine malignant mixed Mullerian Tumor(MMMT) from endometrial carcinom in radiological and clinical aspects. Our purpose is to investigate MR findings that distinguishes MMMT from endometrial carcinoma. MATERIALS AND METHODS: We retrogradely evaluated the magnetic resonance imaging findings of pathologically proven 5 cases of malignant mixed Mullerian Tumor(MMMT) and 13 endometrial carcinomas to know the differential points of these two tumors originating in the endometrial cavity. The size of the mass, presence or absence of myometrial or uterine cervical invasion, growth pattern of the mass, signal intensity and degree and pattern of contrast enhancement were analyzed and compared. RESULTS: The length of the long axis of the MMMT was 1.5-9.0cm(average, 5.7cm) but that of the endometrial carcinoma was 0.5-6.0cm(average, 2.5cm). Invasion of uterine cervix which was found in 3 MMMT cases, dilated the endometrial cavity and the lumen of the uterin cervix and showed the pattern of growing into the external os. Invasion of uterine cervix was found in only one case of endometrial carcinoma. The presence or absence of myometrial invasion, the signal intensity and homogeneity on T1-and T2-weighted images, and the degree and patterns of contrase enhancement showed no significant difference. CONCLUSION: Any specific finding to differentiate MMMT from endometrial carcinoma was not ascertained. However, MMMT can be suspected if the size of the endometrial mass is greater than 5cm and if the mass dilates the enocervical canal and invades the uterine cervix.
Assessment of Perirenal Fat Infiltration in Renal Cell Carcinoma by CT.
Dae Hyoun Cho, Jae Ho Cho, Jay Chun Chang, Bok Hwan Park
Yeungnam Univ J Med. 1997;14(1):175-182.   Published online June 30, 1997
DOI: https://doi.org/10.12701/yujm.1997.14.1.175
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AbstractAbstract PDF
Forty-two preoperative CT scans with renal cell carcinoma were reviewed and compared with pathologic findings to evaluate the differential points between stage I and II. Regardless of whole body staging, perirenal fat infiltrations were seen in 9 cases and the other 33 cases showed no infiltration onto perirenal fat tissue. We retrospectively reviewed them by comparing tumor size and CT findings, following three view points, lobulating contour of tumor margin, thickening of Gerota's fascia and strands in perirenal fat tissue. The size of them was 2-15 cm, size of the stage I tumors was 2-15 cm and that of stage II was 6-15 cm. In stage I(n=33), 25 cases(76%) showed smooth margin, and the others(n=8) showed lobulating contours. Thickening of Gerota's fascia was observed in 7 cases(21%) and strands in perirenal fat tissue in 14(42%). Of these, only one positive finding was seen in 7 cases(21%), 2 findings in 6(18%), 3 findings in 3(9%) and nothing in 17cases(51%). In stage II(n=9), 3 cases(34%) showed smooth margin, and the others(n=6) showed lobulating contours. Thickening of Gerota's fascia were observed in 5 cases(55%) and strands in perirenal fat tissue in 9(100%). Of these, one finding was seen in 2 cases(22%), 2 findings in 3(33%), 3 findings in 4(44%). In conclusion, it is insufficient to evaluate the perirenal fat infiltration in renal cell carcinoma with only one positive finding of 3 view points; lobulation of tumor margin, thickening of Gerota's fascia, strands in perirenal fat tissue. But if all these findings are shown, it is helpful to determinate perirenal fat infiltration of renal cell carcinoma.

JYMS : Journal of Yeungnam Medical Science