Study on the signs of Ureteral Negative calculi in intravenous urography

Objective: To assess the efficacy of intravenous urography (IVU) in ureteral negative calculi. Method: IVU was taken in 80 patients with suspected calculi in urinary system. Results: Ureteral negative calculi were found 13 cases in the superior segment of ureters, 28 in the middle and 39 in the inferior. They would partially had the signs in filling defect, calculi staining, shortly break in ureter, collapse or narrow in ureter, interruption, kidney blanking and visualization with slightly expanding in the full tract of unilateral ureter. Conclusions: Intravenous urography was an effective and accurate pathway to diagnosis of the urinary diseases especial in the patients with ureteral negative calculi.