Abstract
An 80-year-old man was admitted to the hospital because of fever and abdominal pain lasting for about one week. On laboratory data, WBC and CRP were remarkably elevated. Abdominal CT scan showed an abdominal mass approximately 12 cm in diameter which contained liquid and air. We diagnosed the mass as abdominal abscess of unknown cause. After administration of antibiotics, symptoms and laboratory data gradually improved. But 11 days later, abdominal pain became worse and abdominal CT scan showed that the abdominal abscess enlarged, therefore emergency operation was performed. On intraoperative findings, the abdominal abscess was a cystic tumor approximately 15 cm in diameter arising from the small intestine which contained necrotic tissue. This tumor was resected with the small intestine. Pathological studies showed that the tumor was composed of spindle cells and epithelioid cells. Immunohistochemically, the tumor cells were positive for c-kit, and the tumor was diagnosed as gastrointestinal stromal tumor of the small intestine. Gastrointestinal stromal tumor of the small intestine complicated with abscess formation is rare, and therefore we report this case with some literature review.
