A Case of an Intra-abdominal Desmoid Tumor with FDG Uptake on PET

Abstract

A 70-year-old man undergone distal gastrectomy for gastric cancer (T1, N1, M0, Stage IB) about 2 years earlier showed elevated serum CEA at a follow-up study. Colonofiberscopy and computed tomography (CT) revealed a 3 cm submucosal tumor in the transverse colon. Fluorodeoxyglucose positron emission tomography (FDG-PET) showed abnormal uptake of FDG (standard uptake value : SUV max early 5.7, delay 7.0) in the tumor. Either of lymph node recurrence of the gastric cancer, colon cancer or gastrointestinal stromal tumor was likely as preoperative diagnosis, and laparotomy was performed. During surgery we identified the tumor in the vicinity of the hepatic flexure which was in contact with the colonic wall. It was a whitish and elastic hard tumor. We could not rule out a possibility of malignant neoplasm and performed right hemicolectomy. Histopathological examination showed a desmoid tumor. No signs of recurrence have been seen. We report a case of an intra-abdominal desmoid tumor with FDG uptake on PET.