Abstract
An asymptomatic 51-year-old man was found to have an abdominal tumor by an abdominal urtrasonography conducted during clinical observation for diabetes. The tumor was visualized along the pancreatic lower edge with obscure border with the pancreas. Abdominal CT and magnetic resonance imaging scans showed that the tumor was hypervascular with necrosis inside on the border of the pancreas. An abdominal angiography revealed that the feeding artery was the first jejunal branch. The patient was operated on with a diagnosis of gastrointestinal stromal tumor (GIST) of the jejunum. A tumor measuring about 6cm in diameter was present in the jejunal wall at 3cm distal from the Treitz' ligament, and a partial resection of the jejunum was performed.
Histopathological examination revealed that the main tumor was composed of spindle-shaped cells with proliferation in HE staining. Immunohistochemically, these cells were strongly positive for c-kit, so we definitely diagnosed the case as jejunal GIST of intermediate malignancy.
