Extrapharyngeal nasopharyngeal fibroma.
D000293:Adolescent; D002648:Child; D005350:Fibroma / Q000175:diagnosis* / Q000473:pathology; D006801:Humans; D008297:Male; D009303:Nasopharyngeal Neoplasms / Q000175:diagnosis* / Q000473:pathology; D009361:Neoplasm Invasiveness