Hemangiopericytoma of the head and neck.
D000293:Adolescent; D000328:Adult; D006393:Hemangiopericytoma / Q000473:pathology* / Q000628:therapy; D006801:Humans; D007012:Hypopharyngeal Neoplasms / Q000473:pathology* / Q000628:therapy; D008297:Male; D008441:Maxillary Neoplasms / Q000473:pathology* / Q000628:therapy; D010610:Pharyngeal Neoplasms / Q000473:pathology*