Abstract
We report a case of mesenteric schwannoma of the small intestine, which was mistaken for an ovarian tumor. A 72-year-old woman was admitted for abdominal pain. Computed tomography showed a 10-cm mass in the lower abdominal cavity. Considering the age and sex, malignant ovarian tumor was thought to be the most likely diagnosis, and surgery was performed. The tumor was derived from the mesentery of the small intestine and was resected. It was found to be composed of spindle-shaped cell bundles and was S-100 protein-positive, CD34-negative, CD117-negative, and α-SMA-negative. There were no findings of malignancy. The final diagnosis was a benign mesenteric schwannoma. Although mesenteric schwannoma of the small intestine is rare, it should be considered in the differential diagnosis of ovarian tumors.
