Intussusception secondary to descending colon lipoma presenting with simultaneous acute appendicitis.

We report a patient with a descending colon lipoma presenting with hematochezia who developed intussusception, which was simultaneously accompanied by acute appendicitis. A 43-year-old man presented with hematochezia. Colonoscopy revealed a submucosal tumor with a reddish surface in the descending colon. A solid mass with fat density value measuring 5 cm in diameter was observed in the descending colon on CT. While awaiting elective resection, the patient developed lower abdominal pain. CT demonstrated antegrade colo-colonic intussusception in the descending colon. Simultaneously, the appendix was inflamed with a high density intraluminal lesion suspected to be a fecalith. The diagnosis of simultaneous intussusception and acute appendicitis was made. Appendectomy and partial resection of the descending colon was performed. Histopathological examination was consistent with descending colon lipoma and acute appendicitis. The mechanism for developing hematochezia and the risk for development of colo-colonic intussusception due to large colon lipoma and acute appendicitis were highlighted.