[A man with a strange mass in his defecation].

A 56-year-old patient underwent a preventive colonoscopy. We found a large mass in his colon with a benign aspect. The 'unroofing' technique was used for further diagnosis and we suspected the diagnosis of 'lipoma'. Nine days after the colonoscopy, a part of the lipoma was evacuated through the stool. Histopathological examination of this tissue confirmed the diagnosis of 'lipoma'.