A case of gastrointestinal stromal tumor of the duodenum with difficulty in diagnosis

Abstract

A 73-year-old man who had been aware of right hypochondoralgia since March 2006 was seen at another hospital, when abdominal echography revealed a 7cm-sized pancreatic tumor. Abdominal CT scan performed in our hospital showed a cystic tumor with solid mass formation in the pancreatic head. Malignant potential on mucocele of the pancreas was considered, and pyrolus preserving pancreatoduodenectomy was performed. Histlogically the tumor showed spindle cells arranged in whorls with storiform pattern. Immunohistologically the tumor was positive for c-kit and CD34, but negative for α-SMA and S-100.
Thus duodenal gastrointestinal stromal tumor (GIST) was diagnosed. He has had no signs of recurrence for approximately one year after the operation.