A Case of a Primary Gastrointestinal Stromal Tumor of the Omentum Presenting as an Intra─abdominal Hemorrhage

Abstract

A 58-year-old man was admitted for left hypochondrium pain：enhanced computed tomography (CT) revealed a cystic lesion of the intra-abdominal space. He was referred as a case of intra-abdominal hemorrhage and we aspirated the cyst for diagnosis. Since the aspirated cyst showed just stromal and blood component, we performed diagnostic laparoscopic surgery and excised the mass including the omentum. The pathology report showed the mass was a hematoma, but the outermost layer was uniformly surrounded by c-kit positive cells. The diagnosis was a primary gastrointestinal stromal tumor (GIST) of the omentum. Primary omental GISTs and cystic GIST lesions are rare. We report herein on a case of omental GIST which was difficult to diagnose. We have also included a short discussion of the relevant medical literature in our report.