Urethral valves.
D002648:Child; D002675:Child, Preschool; D000013:Congenital Abnormalities / Q000175:diagnosis; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D008722:Methods; D014513:Ureter / Q000601:surgery; D014521:Urethra / Q000002:abnormalities* / Q000601:surgery