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Small cell carcinoma of the colon: barium study and CT findings

Department of ¹ Diagnostic Radiology and ³ Pathology, Soonchunhyang University, Cheonan Hospital, 23–20 Bongmyung-dong, Cheonan, Chungcheongnam-do, 330-721 and ² Department of Diagnostic Radiology, College of Medicine, Soonchunhyang University, Bucheon Hospital, 1174 Jung-dong, Wonmi-gu, Bucheon, Gyeonggi-do, 420-021, Republic of Korea

View larger version (56K): [in a new window]   Figure 1. Post contrast enhanced CT images of the small cell carcinoma of the colon. (a) Axial CT image shows bulky poorly enhancing mass (black arrows) encircling the transverse colon (open arrows). (b) Axial CT image obtained 55 mm above the mass shows extensive metastatic lymph node enlargement (white arrows) in the both para-aortic areas and along the mesenteric root.

View larger version (108K): [in a new window]   Figure 2. Barium enema examination shows mild annular narrowing of the transverse colon with thick interhaustral folds due to circumferential invasion by the small cell carcinoma. The proximal and distal margins of the lesion (arrows) are gradually tapered.