Prolapsed pedunculated lipoma: a cause of rectosigmoid intussusception.

We report the case of a male in his early 30s who presented with a large prolapsed anal mass, a single episode of rectal bleeding and a 1 day history of lower abdominal pain. Contrast-enhanced CT imaging of the abdomen and pelvis revealed a 4.4 cm lipomatous mass protruding through the anal canal, originating from the sigmoid colon, which had intussuscepted into the rectum and anus. The patient was successfully managed with flexible sigmoidoscopy and excision of the mass. Histopathological examination confirmed the diagnosis of a colonic lipoma.