Abstract
A 42-year-old woman was emergently admitted to the hospital because of epigastralgia lasting for a day. We confirmed peritoneal irritation sign on the upper abdomen during the first examination. Furthermore, abdominal CT scan showed a heterogeneous tumor with partial calcification and ascites in the pelvis. We performed laparotomy with a suspected diagnosis of dissemination of a malignant tumor or a submucosal tumor of the stomach, or an intraperitoneal abscess with panperionitis. Intraoperative findings revealed a palpable tumor on the greater curvature of the stomach in contact with the pyloric ring. The tumor was 10 cm in diameter with an edematous appearance and indistinctive margin which firmly adhered to the stomach. Thus, we removed the tumor with a part of the stomach. Pathological examination showed the heterotopic pancreas with exocrine glands and ducts and the islets of Langerhans. The final diagnosis was heterotopic pancreas of Heinrich type I.
