Juvenile angiofibroma.
D000293:Adolescent; D018219:Histiocytoma, Benign Fibrous / Q000175:diagnosis / Q000453:epidemiology / Q000209:etiology / Q000473:pathology / Q000601:surgery; D006801:Humans; D008297:Male; D009303:Nasopharyngeal Neoplasms / Q000175:diagnosis / Q000453:epidemiology / Q000209:etiology / Q000473:pathology / Q000601:surgery; D012737:Sex Factors