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Purpose Diagnosis of colorectal carcinoma on contrast-enhanced CT relies on demonstration of rectosigmoid wall thickening, perirectal fat stranding, and perirectal lymph nodes. Wall thickening may be the only sign in early carcinoma, and may be mimicked by spasm or adherent faecal matter. Rectosigmoid carcinoma may result in earlier venous return in inferior mesenteric vein (IMV) compared to superior mesenteric vein (SMV). This study evaluates faster venous return of intravenous contrast agent in IMV as a diagnostic sign for colorectal carcinoma.

Fast venous return in inferior mesenteric vein: a new sign for rectosigmoid carcinoma on CT