Appearing and disappearing calyces.
D002648:Child; D002675:Child, Preschool; D003973:Diatrizoate / Q000008:administration & dosage; D006801:Humans; D007674:Kidney Diseases / Q000000981:diagnostic imaging*; D007682:Kidney Pelvis / Q000000981:diagnostic imaging*; D014056:Tomography, X-Ray; D014552:Urinary Tract Infections / Q000000981:diagnostic imaging; D014567:Urography
D003973:Diatrizoate