A case of extraluminal pedunculated gastrointestinal stromal tumor of the small intestine, preoperatively diagnosed as an ovarian tumor

Abstract

A 65-year-old woman, complaining of abdominal fullness, was found to have an abdominal tumor by a nearby clinic, and was referred to our hospital for further examination. Ultrasonography and magnetic resonance imaging revealed a pelvic mass, 7×5 cm in diameter, which was diagnosed as an ovarian tumor as it was adjacent to the uterus. A laparotomy demonstrated that the tumor was not arising from the ovary but from the small intestine, and was growing extraluminally with a narrow peduncle, with no invasion to the surrounding organs. We resected the tumor by partial resection of the small intestine. The tumor was immunohistochemicallly positive for KIT and was diagnosed as gastrointestinal stromal tumor of the small intestine. Although extraluminal pedunculated gastrointestinal stromal tumors of the small intestine are rare and difficult to diagnose before surgery, they remain one possible differential diagnosis for pelvic tumors.