annular carcinoma

annular carcinoma

A term of art referring to a malignancy (most commonly an adenocarcinoma arising in the colonic mucosa) that grows centripetally, forming what radiologists commonly call an apple core lesion and pathologists more often refer to as a napkin ring lesion.

DiffDx
Tuberculosis, Crohn’s disease, lymphoma, yersiniosis.
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Radiographically, the prototype of the malignant colonic stricture is that caused by an annular carcinoma narrowing the lumen abruptly; a portion of tumor can project into the area of normal colon and produce a shoulder defect resulting in the phenomenon of an apple-core appearance.