Massive lower gastrointestinal bleeding due to Dieulafoy lesion of colon.

A 25-year-old man with massive lower gastrointestinal bleeding underwent emergency mesenteric angiography. An actively bleeding lesion was found in the cecum. Right hemicolectomy was performed. Histology revealed a Dieulafoy lesion of the cecum. This is an extremely rare lesion responsible for massive lower GI bleeding.

Mantle cell lymphoma presenting as solitary polypoid colonic lesions.

Mantle cell lymphoma of the intestine is rare, usually presenting as multiple small polyps. We report three men with colonic mantle cell lymphoma in the form of single large polypoid mass. The clinical picture suggested adenocarcinoma; the diagnosis was made at histology and immunohistochemistry of the colectomy specimens.