Unusual sinus tumors. (I. Hemangiopericytoma, II. Benign osteoblastoma). Case reports.
D001859:Bone Neoplasms; D006393:Hemangiopericytoma; D006801:Humans; D009369:Neoplasms; D018215:Osteoblastoma; D012516:Osteosarcoma; D010255:Paranasal Sinus Neoplasms; D012509:Sarcoma
HEMANGIOPERICYTOMA; SARCOMA, OSTEOGENIC