Case of primary orbital hemangiopericytoma.

A case of primary orbital hemangiopericytoma was reported. A 44-year-old woman was first seen at our clinic in June 1970, complaining of exophthalmos of the right eye. On examination, the right eye showed a 6-mm proptosis and an upward displacement. Cerebral angiography revealed a vascularized mass occupying the lower and mid orbit. The tumor was surgically removed and diagnosed histologically as hemangiopericytoma. After the initial surgery, recurrent tumors in the right orbit were resected twice, in June 1975 and December 1979. The purpose of this presentation is to discuss the clinicopathologic features of the tumor. In addition, it is emphasized that hemangiopericytomas originating from the orbit or brain may be histopathologically identical to angioblastic meningiomas.