Ureteropelvic junction obstruction.
D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D006801:Humans; D007223:Infant; D007682:Kidney Pelvis / Q000503:physiopathology*; D008297:Male; D014517:Ureteral Obstruction / Q000000981:diagnostic imaging* / Q000209:etiology*; D014567:Urography