napkin ring lesion

napkin ring lesion

a circumferential adenocarcinoma of the rectum, often a cause of rectal stricture.

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napkin ring lesion

Apple core lesion Radiology A pattern of GI constriction caused by mucosal erosion and stenosis with 'shouldering' of the margins, corresponding to an exophytic encircling mass in the colonic lumen, usually corresponding to a large adenocarcinoma, more in the left colon;
the mass may obstruct fecal flow, inducing pencil-thin stools, and be partially mimicked by concentric amebomas in Entamoeba histolytica granulomas, by exuberant submucosal fibrosis in Crohn's disease, in the stenosing fibrotic stages of diverticulosis coli, in an SCC arising in a dermoid cyst of the ovary with invasion of the muscularis of the rectosigmoid colon and in small intestinal adenoCA. See Squamous cell carcinoma.