Multiple intra-abdominal desmoid tumors originating from mesentery of the ascending colon and greater omentum without history of previous surgery-a case report-

Abstract

We report a rare case of multiple intra–abdominal desmoid tumors originating from mesentery of the ascending colon and greater omentum. A 54–year–old man was admitted to our hospital for further examination of an abdominal tumor. He had no history of abdominal surgery, injury and familial adenomatous polyposis (FAP). The abdominal CT revealed a lightly enhanced mass (25×45mm in diameter) located in the colonic mesentery and invading the duodenum. Suspecting a GIST of the duodenum, we conducted laparotomy, which demonstrated the tumor originating from the colonic mesentery, involving the ileocolic artery, vein, and thrid portion of the duodenum. Moreover, two small nodules were also found at the greater omentum. We confirmed small nodules were peritoneal seedings from the main tumor at operation, and were able to remove the tumors completely by right hemi–colectomy with wedge resection of the duodenum. Histopathological examination revealed desmoid tumors with minimal nuclear pleomorphism and minimal mitotic activity. Thus, the tumors were finally diagnosed as multiple intra–abdominal desmoid tumors originating from mesentery of the ascending colon and greater omentum. The patient has shown no sign of recurrence in the 22 months follow–up since surgery.