title: Urinary retention due to congenital posterior urethral polyp in a boy.
mesh_terms: D001002:Anuria / Q000209:etiology*; D002675:Child, Preschool; D006801:Humans; D008297:Male; D011127:Polyps / Q000150:complications* / Q000151:congenital; D014523:Urethral Neoplasms / Q000150:complications* / Q000151:congenital