Abstract
Progressive anemia was found in a 73-year-old man with an old myocardial infarction who was seeing a cardiovascular internist regularly. Because a fecal occult blood test showed a positive result, we performed a colonoscopy and observed a pedunculated tumor mass with a diameter of 40 mm in the presence of blood clots on the surface of its tumor mass. We judged that this tumor mass was the cause of the bleeding and therefore performed endoscopic excision. The tumor mass was histopathologically diagnosed as a lipoma. A colonic lipoma is a benign non-epithelial tumor, with a frequency around 3% of autopsy cases ; it is relatively rare in clinical practice.
