Test and teach number two.
D000293:Adolescent; D018219:Histiocytoma, Benign Fibrous / Q000175:diagnosis / Q000473:pathology*; D006801:Humans; D008297:Male; D009303:Nasopharyngeal Neoplasms / Q000175:diagnosis / Q000473:pathology*; D009305:Nasopharynx / Q000473:pathology