Annular colon lipoma: a case report and review of the literature.

Colonic lipomas are generally mildly symptomatic or asymptomatic pedunculated or sessile polyps, although they have been reported to cause intussusception or significant bleeding. The difficulty in differentiation is primarily with adenomatous polyps. We describe the unique case of a symptomatic annular colon lipoma simulating an annular colon carcinoma.