A 54-year-old woman was referred to our hospital for continuous abdominal pain and melena lasting for 2 weeks. Blood examination results were normal. We performed a colonoscopy and observed a tumor of 30-mm diameter with ulcers and bleeding on the surface. Computed tomography showed low absorption densities of lesions larger than 30 mm. Magnetic resonance imaging of the tumor showed high signal intensity on T1-weighted images, iso-signal intensity on T2-weighted images, and low signal intensity on fat-suppressed T2-weighted images. We performed laparoscopic sigmoidectomy, and the tumor was histopathologically diagnosed as a lipoma. A colonic lipoma is a benign nonepithelial tumor, which is relatively rare in clinical practice.
