title: On the advantages of long delayed films after retrograde pyelography.
mesh_terms: D002648:Child; D006801:Humans; D006869:Hydronephrosis / Q000150:complications / Q000000981:diagnostic imaging*; D052177:Kidney Diseases, Cystic / Q000000981:diagnostic imaging*; D008297:Male; D008722:Methods; D013997:Time Factors; D014517:Ureteral Obstruction / Q000000981:diagnostic imaging* / Q000209:etiology; D014567:Urography