The orbital and sinonasal hemangiopericytoma, 2 case reports:
Background & objective: Hemangiopericytoma is an uncommon vascular tumor derived from the majicontrast red pericytes of Zimmermann.The most common location of the tumor is pelvic retroperitoneum and musculoskeletal system of the lower extremities.It is rarely seen in the head and neck area.In addition, only 0.8% to 3% of all orbital tumor