High Resolution Rectal MRI 68 year old male presents with rectal bleeding. High resolution MRI demonstrates a pathognomonic appearance of a villous adenoma in the rectum, as well as a colonic adenocarcinoma superiorly in the rectosigmoid. (A) "Apple-core" tumor of the rectosigmoid, with circumferential irregular thickening consistent with colonic adenocarcinoma. (B) Polypoid mass in the rectum, with a shaggy nodular contour, sometimes likened to the appearance of a cauliflower. Histologic correlation demonstrates excellent characterization of the lesion. Click on image to enlarge.

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