2017 Volume 42 Issue 6 Pages 1044-1051
The patient was a 63-year-old woman who consulted a local physician because of heartburn. Ultrasonography, contrast-enhanced computed tomography, and magnetic resonance imaging of the abdomen showed an intra-abdominal mass about 40 mm in diameter adjacent to the intestine. No distinct feeding vessels could be identified. Close examination of the upper and lower gastrointestinal tract showed no abnormalities. The mass was laparoscopically resected for the purpose of diagnosis and treatment. The mass was located in the omentum proximal to the transverse colon and was mobile, with no invasion of the gastrointestinal tract or other organs. An omental tumor was diagnosed. Immunohistochemically, the mass was negative for c-kit, CD34, and S-100 and positive for vimentin and desmin, with an MIB-1 index of ≤1%. A leiomyoma of the omentum was thus diagnosed. If an intra-abdominal mass is found incidentally, leiomyoma should be considered in the differential diagnosis. Because it is difficult to make a definitive diagnosis before surgery, laparoscopic surgery, which permits minimally invasive observation and resection, is useful.
