title: Frequency of backflow in acute renal colic.
mesh_terms: D000328:Adult; D000368:Aged; D003287:Contrast Media; D004231:Diuresis; D005260:Female; D006801:Humans; D007668:Kidney / Q000503:physiopathology; D008068:Lipomatosis / Q000000981:diagnostic imaging; D008297:Male; D008875:Middle Aged; D013997:Time Factors; D014514:Ureteral Calculi / Q000000981:diagnostic imaging*; D014517:Ureteral Obstruction / Q000000981:diagnostic imaging; D014567:Urography
chemical_list: D003287:Contrast Media