title: Hemangiopericytoma.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001900:Boston; D002681:China; D005260:Female; D006393:Hemangiopericytoma / Q000473:pathology* / Q000601:surgery; D006801:Humans; D008297:Male; D008875:Middle Aged; D009918:Orbital Neoplasms / Q000473:pathology* / Q000601:surgery; D012189:Retrospective Studies