Papillary adenocarcinoma arising in a duplication of the cecum.

Malignant carcinomatous change is a rare complication in an enteric duplication cyst, and papillary adenocarcinoma is especially unusual. We describe a papillary adenocarcinoma, arising from a duplication of the colon, seen as a cyst with an enhancing papillary projection nodule located adjacent to the wall of the ascending colon and cecum on computed tomography.