Malignant schwannoma of the ovary. Report of a case

A malignant schwannoma, apparently arising in the left ovary of a 71-year-old woman is described. The patient had no stigmata of von Recklinghausen's disease. The tumor was located in the position of the left ovary and had metastasized throughout the peritoneal cavity. The neural sheath origin of the tumor was confirmed by electron microscopic examination. The tumor is thought to have arisen from small nerves in the ovarian hilus.