Urethral valve obstruction.
D002675:Child, Preschool; D004106:Dilatation; D006801:Humans; D006869:Hydronephrosis / Q000473:pathology; D007223:Infant; D007231:Infant, Newborn; D007668:Kidney / Q000601:surgery; D008297:Male; D014513:Ureter / Q000473:pathology; D014521:Urethra / Q000473:pathology; D014525:Urethral Stricture / Q000145:classification / Q000151:congenital* / Q000175:diagnosis / Q000473:pathology; D001743:Urinary Bladder / Q000473:pathology; D014552:Urinary Tract Infections / Q000209:etiology; D014567:Urography