Polyp of the posterior urethra.
D002675:Child, Preschool; D006801:Humans; D008297:Male; D011127:Polyps / Q000151:congenital* / Q000000981:diagnostic imaging / Q000601:surgery; D014523:Urethral Neoplasms / Q000151:congenital* / Q000000981:diagnostic imaging / Q000601:surgery; D014524:Urethral Obstruction / Q000209:etiology / Q000601:surgery; D014567:Urography