INTERURETERIC RIDGE EDEMA - INCIDENCE AND ETIOLOGY

Background: Interureteric ridge edema may be seen at intravenous urogr aphy (TW) and is related to acute lower ureteral obstruction, trauma, or calculi. The purpose of this study was to explore the relationship between interureteric ridge edema and acute distal ureteral obstructio n caused by ureteral calculi. Methods: A total of 338 patients who had IVU for various indications during a 6-month period were reviewed for the presence of interureteric ridge edema. Results: Interureteric rid ge edema was seen in 12 (4%) of 338 patients, all with acute lower ure teral obstruction from stones. Interureteric ridge edema was best demo nstrated with the partially filled bladder him or postvoid bladder fil m in all cases. Conclusion: Interureteric ridge edema is most commonly caused by stone-induced distal ureteral obstruction and is less commo nly seen with recent passage of a stone or other etiologies. Interuret eric ridge edema was present in 26% of patients with acute lower urete ral obstruction.