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72-year-old man with adenocarcinoma of ascending colon.
A. Contrast-enhanced axial CT scan shows irregular thickening of ascending colon (arrows) and pericolic fat stranding (curved arrow).
B. Caudal to colon wall thickening, there are colon wall defect (arrowheads) at level of ileocecal valve and adjacent peritoneal fluid (short arrow). Free perforation was surgically confirmed at proximal portion of colon cancer.
