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논문 기본 정보

자료유형
학술저널
저자정보
한성태 (가톨릭대학 의학부 방사선과학교실)
저널정보
대한영상의학회 대한방사선의학회지 대한방사선의학회지 제20권 제3호
발행연도
1984.1
수록면
462 - 472 (11page)

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The ability of CT scanning of the mediasinum to distinguish specific tissue densities and to display in a transverse plane often provides unique diagnostic information unobtainable with conventional radiographic mehtods. We retrospectively analyzed the CT findings of 20 cases of proven mediastinal masses at the Department of Radiology, ST. Mary's Hospital, Catholic Medical College from February 1982 to June 1984 CT scans were performed with a Siemens Somatiom 2 scanner. The technical factors involved were tube voltage 125 kVp, exposure time 5 seconds, 230 mAs, 256x256 matrices, and pixel size 1, 3mm. 8mm slices were obtained at 1 cm interval from the apex of the lung to the diaphragm. If necessary, additional scans at 5mm interval or magnifying scans were obtained. After pre-contrast scans, contrast scans were routinely taken with rapid drip-infusion of contrast media (60% Conray, 150cc). The results obtained were as follows; 1. Among 20 cases, 11 were tumors, 4 infectious masses and 5 aneurysms of great vessels, tortuous brachiocephalic artery and pericardial fat pad. In each case CT showed accurate location, extent, and nature of the masses. 2. Solid tumors were thymic hyperplasias, thymoma, thymus carcinoid, neurilemmoma and germ cell tumors (seminoma, embryonal cell carcinoma). Internal architecture was homogeneous in thymoma, thymus carcinoid, neurilemmoma, seminoma but inhomogeneous in thymic hyperplasias and embry onal cell carcinoma. CT numbers raged from 16 to 49 HU and were variably enhanced. 3. Cystic tumors consisted of teratomas, cystic hygroma, and neurilemmoma. Teratomas contained calcium and fat, inhomogeneous mass with strongly enhancing wall. Cystic hygroma was nonenhancing mass with HI of 20 4. All of germ cell tumors (2 teratomas and one each of seminoma and embryonal cell carcinoma) and one of 2 thymic hyperplasias had calcium deposit. 5. Tuberculous lymphadenopathies presented as a mass in the retrocaval pretracheal space and hilar region with HU ranging from 34 to 64 and enhancement was variable. Mediastianl abscess was almost not enhancing, presenting as an inhomogeneous mass of 21 HU with mottled air densities. 6. Aneurysm of great vessels, tortuou brachiocephalic artery and pericardial fat pad which were often misinterpretted as mediastinal tumor on the conventional radiographic study could be easily distinguishable on CT scan.

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