“…Most frequently, a solitary rectal or rectosigmoid mass develops that may have a papillary appearance, as in the presented patient, suggestive of either a neoplastic process or colonic pseudopolyps. In some patients with distal disease, rectal pro lap e may occur (12) and, very rarely, as recorded in one prior instance ( 13 ), complete intestinal obstruction may develop necessitating surgical decompression. In the current report, the presentation was dramatic with sigmoidorectal intussception of an apparent colonic papillary mass lesion; the gross appearance raised the possibility of a neoplastic complication of colitis, a common difficulty noted in the clinical and pathological literature ( 6,13).…”