Congenital ureteral valves.
D002675:Child, Preschool; D003937:Diagnosis, Differential; D006801:Humans; D006869:Hydronephrosis / Q000175:diagnosis; D008297:Male; D008875:Middle Aged; D011859:Radiography; D013997:Time Factors; D014513:Ureter / Q000002:abnormalities* / Q000473:pathology; D014514:Ureteral Calculi / Q000000981:diagnostic imaging / Q000601:surgery; D014517:Ureteral Obstruction / Q000151:congenital* / Q000000981:diagnostic imaging / Q000196:embryology / Q000601:surgery