Two cases of hemangiopericytoma involving the genitourinary tract are reported and the literature reviewed. The clinical data suggest that these tumors are slow growing malignant tumors, and long-range follow-up is extremely important. They are seen on occasion roentgenographically as calcified soft tissue masses and angiographically can be very vascular. Treatment has usually been surgical, although partial success with irradiation and chemotherapy has been reported. A combination of surgery, radiation, and chemotherapy may be most efficacious.
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