Managing a long-recurring primary orbital hemangiopericytoma.

Hemangiopericytomas are uncommon vascular neoplasms that originate from the pericytes lining capillaries and postcapillary venules. Few cases of primary orbital hemangiopericytoma have been reported. We present a 61-year-old woman with longstanding, recurrent benign orbital hemangiopericytoma and results of its successful removal.