Juvenile nasopharyngeal angiofibroma.
D000293:Adolescent; D000367:Age Factors; D003937:Diagnosis, Differential; D018219:Histiocytoma, Benign Fibrous / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000473:pathology; D006801:Humans; D008297:Male; D009303:Nasopharyngeal Neoplasms / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000473:pathology; D011859:Radiography; D012737:Sex Factors