Current management and clinical outcome of hemangiopericytomas.
Hemangiopericytoma is a rare vascular tumor with variable malignant potential. We report perioperative embolization of a hemangiopericytoma and review the Virginia Mason Clinic experience with six patients during the period 1975 to 1990 with respect to demographics, diagnosis, treatment, and outcome. Our experience suggests that hemangiopericytomas have a variable but predictable malignant potential based on histology and clinical behavior. Three of six patients died of their disease. The remainder were alive and well at 1, 3.5, and 12 postoperative years. These tumors can be specifically and completely delineated preoperatively using magnetic resonance imaging and angiography, the diagnostic procedures of choice. Hemangiopericytomas are highly vascular and amenable to preoperative transarterial embolization. Our most recent case was performed without blood transfusion. This differs from literature reports of massive transfusion requirements and two cases of exsanguination following resection. Finally, recent literature has reported these tumors to respond to greater than 4,500 cGy of local postoperative radiotherapy. We conclude that this interval review of hemangiopericytomas is both timely and relevant with respect to recent developments in imaging and catheter technology. We recommend routine angiography and perioperative embolization prior to wide excision and postoperative radiotherapy.