An atypically localized gastrointestinal stromal tumor: a case report of pancreas gastrointestinal stromal tumor.

Gastrointestinal stromal tumors (GISTs) are the most common mesenchymal tumors of the gastrointestinal tract. They can arise from any part of the tract as well as the omentum, mesentery or retroperitoneum. In this study, we present a case of a GIST originating from an extraordinary site, the pancreas. Evaluation of 30-year-old man with complaints of abdominal distension revealed a cystic, distal pancreatic lesion 13 cm in diameter. There were no intra-abdominal or distant organ metastases. The patient was operated with a diagnosis of cystic pancreas tumor, distal pancreatectomy and splenectomy was performed. The lesion was diagnosed as gastrointestinal stromal tumor upon histopathological examination. He was discharged on the sixth postoperative day without any complications and is being followed up for 21 months without systemic or local recurrence. Extragastrointestinal GISTs are reported rarely. To our knowledge, only one pancreatic GIST has been reported previously in the English literature.