Vascular tumors constitute a considerable portion of orbital tumors, but they are not a homogeneous group. Reese1 has divided them into monomorphous and polymorphous groups, depending upon the number of embryonic elements. The polymorphous types are represented by the various hemangiomata and possibly result from congenital rests. The monomorphous types, however, are formed by proliferation of specific components of the blood vessel wall and, hence, more nearly represent true neoplasms. Hemangiopericytoma is a monomorphous type in which the proliferating cell is the pericyte. Its diagnostic features, clinical course, and prognosis when it involves the orbit, have not been established.2-8 It is the purpose of this paper to report the clinical features and microscopic appearance of one of these unusual tumors in a patient who died of an unrelated condition after orbital surgery.
Report of Case
A 69-year-old white male was admitted to the hospital complaining of tissue swelling
HANEY RF. Hemangiopericytoma of the Orbit. Arch Ophthalmol. 1964;71(2):206-208. doi:10.1001/archopht.1964.00970010222013