A case of metastatic malignant hemangiopericytoma of the ovary: recurrence after a period of 17 years from intracranial tumor

Hemangiopericytoma is an uncommon vascular tumor. Primary or metastatic hemangiopericytoma of the ovary is extremely rare. A 48-year-old Japanese woman had a tumor in the neck. Simultaneously, a solid ovarian tumor was detected. She had received treatment for intracranial hemangiopericytoma 17 years previously. For the ovarian tumor, she underwent a total abdominal hysterectomy and bilateral salpingo-oophorectomy. The left ovarian tumor weighed 1510 g and its cut surface was solid without areas of hemorrhage or necrosis. It was microscopically composed of tightly packed tumor cells outside of many vascular vessels. One or two mitotic figures were counted per 10 high power fields. Immunohistochemically, vimentin was expressed but factor-VIII-related antigen, CD 31, and CD 34 were not expressed in the tumor cells. Electron microscopy showed that the tumor cells were grown outside of the endothelium-lined vascular spaces. A discontinuous external basal lamina was also observed. We present a case of metastatic malignant hemangiopericytoma of the ovary from a primary intracranial hemangiopericytoma with a long interval of 17 years.

Primary angiosarcoma of the ovary: a clinicopathologic, immunohistochemical and electronmicroscopic study

The present report of a 25 year old woman with a primary ovarian angiosarcoma is supplemented by histochemical and ultrastructural studies and reviews the literature of this extremely rare neoplasm. Since this ovarian tumor, especially in young women, may constitute a diagnostic pitfall, problems relating to differential diagnosis are emphasized. Although the origin of this neoplasm appears to occur most likely from the rich ovarian vasculature, other less conventional histogenetic theories such as a possible origin in mixed mullerian tumor, in teratoma or in other ovarian germ cell tumors have also been proposed and are considered in this paper.