Obstruction of the lower ureter by aberrant vessels in children.
D006801:Humans; D006869:Hydronephrosis / Q000151:congenital; D007223:Infant; D008297:Male; D014469:Umbilical Arteries / Q000002:abnormalities*; D014517:Ureteral Obstruction / Q000151:congenital / Q000209:etiology*; D014567:Urography