Radiolucent folds in the upper urinary tract.
D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D002908:Chronic Disease; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007223:Infant; D007682:Kidney Pelvis / Q000000981:diagnostic imaging*; D008297:Male; D011704:Pyelonephritis / Q000000981:diagnostic imaging / Q000517:prevention & control; D014513:Ureter / Q000000981:diagnostic imaging* / Q000473:pathology; D014552:Urinary Tract Infections / Q000000981:diagnostic imaging* / Q000628:therapy; D014567:Urography; D014718:Vesico-Ureteral Reflux / Q000000981:diagnostic imaging