Abstract
A 71-year-old woman seen for dizziness having anemia was found on physical examination to have tenderness and rebound tenderness of the upper abdomen. Abdominal computed tomography showed a solid mass 10 cm in diameter in contact with the gastric wall, and hemoperitoneum. Emergency laparotomy showed 1200 ml of hemoperitoneum and a solid mass with a short stalk at the posterior stomach wall. The mass was resected with wedge-shaped resection of the gastric wall. The tumor was capsulated and filled with massive coagula. Histologically, the mass consisted of spindle-shaped cells and rare mitosis. Immunohistochemical staining showed positive c-kit, and partial positive α-SMA. We made a diagnosis of gastrointestinal stromal tumor (GIST) with differentiation to muscular tissue. Only 7 cases of hemoperitoneum caused by GIST, including our case, have been reported.
