Abstract
A 69-year-old man visited the hospital with a 2-day history of abdominal pain and a large mass in the left lower abdominal quadrant. Abdominal CT revealed a large mass of the descending colon with telescoping of the colonic segment into the distal colon ; the patient was diagnosed as having intussusception and referred for surgery. We decided to perform elective surgery as there was no sign of intestinal obstruction, and performed MRI before the operation. The preoperative diagnosis was a 12-cm sized tumor of the descending colon with intussusception ; the possibility of malignancy could not be ruled out.
A left hemicolectomy with lymphnodectomy (D3) was performed. During the operation and after the resection, the intussusception persisted. The tumor was finally diagnosed, based on histopathology and immunohistochemistry, as a leiomyosarcoma. The postoperative course was uneventful and the patient has shown no signs of recurrence over the two years since the operation.
