title: Posterior urethral valves presenting as an abdominal mass lesion due to perirenal urinoma.
mesh_terms: D000008:Abdominal Neoplasms / Q000175:diagnosis / Q000209:etiology*; D003560:Cysts / Q000175:diagnosis / Q000209:etiology*; D006801:Humans; D007231:Infant, Newborn; D007668:Kidney; D008297:Male; D014463:Ultrasonography; D014524:Urethral Obstruction / Q000150:complications*