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배오근 대한영상의학회 1997 대한영상의학회지 Vol.36 No.2
Purpose : To evaluate the radiologic findings of acute intramural hematoma of the aorta, and the clinical follow up thereof. Materials and Methods : Among 34 cases confirmed clinically and radiologically as aortic dissection, an analysis was carried out based on 15 cases in which intramural hematoma without false lumen was demonstrated, on initial CT, 12 cases of in which follow up CT was used and five cases involving an aortogram. Elements such as the shape of the thickened aortic wall, ulcer-like intimal defects, and intimal calcification were examined. Changes in these elements were also examined on follow up CT. Results : DeBackey types I and II accounted for one and 14 cases, respectively. Initial precontrast CT demonstrated continuous, crescentic high attenuation areas along the wall of the descending aorta. In postcontrast scans, the crescentic areas were of relatively lower-attenuation and appeared along the aorta wall. Displaced intimal calcifications were seen in nine of fifteen patients. There was no intimal flap on all five aortogram, while aortic wall thickening and atherosclerotic change were demonstrated in four cases and in one case, case, respectively. Focal ulcers were seen in three cases. Ulcer-like intimal defects were demonstrated in a total of eleven cases (eight on CT, two on aortogram, and one on both). In ten of the twelve cases seen on follow up CT, the thickness of the intramural hematoma was seen to be reduced. Among the 15 cases, the operation was performed in two cases, and the remaining 13 received conservative treatment. In ten cases observed for more than twelve months, a recurrence of symptoms did not occur. Conclusion : Eccentric aortic wall thickening in patients who complain of acute chest pain is the result of acute aortic dissection with intramural hematoma, or a penetrating atherosclerotic ulcer of the aorta. The latter may be differentiated from the former by the presence of on ulcer-like intimal defect. When both diseases are limited to the descending aorta, conservative treatment may be effective, unless patients experience persistent or recurrent chest pain, or unless intramural hematoma progresses further.
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뇌수막종의 자기공명영상:T2 신호강도와 병리조직소견과의 상관관계
배오근 대한영상의학회 1995 대한영상의학회지 Vol.32 No.5
Purpose: To correlate histologic subtypes with MR signal intensity in meniagioma and to find etiologic factorsresponsible for the signal characteristics of T2WI. Materials and methods: We reviewed MRIs and histopathologicstudies in 35 cases of meningioma. MR signal intenisty was measured with respect to cerebral cortex(gray matter)as hypointense,isointense,or hyperintense. Pathologically, meningioma was classified into subtypes, acording tothe new WHO classification of brain tumors. The degree of cellularity,collagen,and vascularity was graded from 1to 3, and presence or absence of psammoma bodies,microcysts,micronecrosis and microhemorrhage was obeserved.Multiple linear regression analysis was done to find relationship between the pathologic findings and MR signalintensity of T2WI. Results: Even in the same subtype, cellularity,collagen and vascularty of the tumor weredifferent. T1WI was not useful in discriminating pathologic subtype because most tumors were isointense orhypointense to the cortex regardless of histologic type. Most tumors showed various signal intensity on T2WI, butT2WI were not useful, either. Exceptionally, all five cases of microcystic meningiomas were hyperintense on T2W1.In analysing the relationship between MR signal intensity and pathologic factor, increased collagen contentproduced decreased signal intensity (P<0.01) and the existence of microcyst resulted in high signalintensity(P<0.01). Cellularity, vascularity, microcalcification, micronecrosis and microhemorrhage had norelationship with signal intensity on T2WI. Conclusion: Except for the five microcystic meningiomas withhyperintense on T2WI, there was no relationship between MR signal intensity and subtype of meningiomas. Pathologicfactors influencing T2 signal intensity were microcyst and collagen. Even in the same subtypes of meningiomas, theT2 signal intensity was different. This may be due to different ratio of microcyst and collagen.
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이학수,이승로,배오근,박동우,최요원,전석철,박충기,함창곡,이중달 대한영상의학회 1997 대한영상의학회지 Vol.36 No.2
폐 모세포종은 매우 드문 원발성 폐 종양으로 태아의 폐와 유사한 간엽성 조직 성 분과 상피성 조직 성분으로 구성도어 있다. 저자들은 32세 남자에서 발생한 폐 모세포종의 단발성 출혈성 뇌 전이를 경험하였는데, 뇌 CT상고밀도의 출혈성 병소와 괴사에 의한 저밀 도 병소로 구성되고 조영 증강되는 부분이 적어 다른 뇌출혈들과의 감별이 어려웠다. Pulmonary blastoma is a rare primary lung malignancy consisting of mesenchymal and epithelial components resembling the fetal lung. We report a case of pulmonary blastoma with solitary hemorrhagic brain metastasis in a 32-year-old man. This metastatic lesion was composed mainly of hemorrhagic high density and central necrotic low density areas; on CT it showed partial contrast enhancement and was thus impossible to distinguish from other hemorrhagic lesions.
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