A Case of Sporadic Abdominal Desmoid Tumor Causing Colon Diverticulitis and Perforation in a Patient Without a History of Abdominal Surgery

Abstract

A 38–year–old man with no history of surgery was admitted to hospital because of acute abdominal pain. An enhanced abdominal CT scan showed a mass with a diameter of 4 cm in the left transverse colon. A colonoscopy revealed a longitudinal ulcer, and he was treated conservatively with observation in the outpatient clinic. Seven months thereafter, he was admitted to hospital once again because of acute epigastric abdominal pain, and an enhanced abdominal CT scan showed a larger mass with a diameter of 5 cm in the same area and free air around this mass. He was diagnosed as having colon perforation, and emergency surgery was performed. An extramural tumor was found in the left colic flexure, and abscess formation was seen at the omental bursa. We resected the tumor together with the transverse colon. Histological examination revealed a desmoid tumor comprised of spindle cells with collagen fibers. We report a case of sporadic abdominal desmoid tumor with no history of abdominal surgery that might have caused diverticulitis, which might have been related to colon perforation.