Pelvi-ureteric junction obstruction in children.
D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D006801:Humans; D007223:Infant; D007682:Kidney Pelvis / Q000000981:diagnostic imaging / Q000601:surgery*; D011859:Radiography; D012189:Retrospective Studies; D014517:Ureteral Obstruction / Q000000981:diagnostic imaging / Q000601:surgery*; D014546:Urinary Catheterization