Endourology/Urolithiasis Effectiveness of Flexible Ureteroscopic Stone Removal for Treating Ureteral and Ipsilateral Renal Stones: A Single-Center Experience

Purpose: The aim of this study was to evaluate the effectiveness of simultaneous flexible ureteroscopic removal of stones (URS) for ureteral and ipsilateral renal stones and to analyze the predictive factors for renal stone-free status. Materials and Methods: We retrospectively reviewed the records of patients who under-went simultaneous flexible URS of ureteral and ipsilateral renal stones from January 2010 to May 2012. All operations used a flexible ureteroscope. We identified 74 cases of retrograde intrarenal surgery and 74 ureteral stones (74 patients). Stone-free status was respectively defined as no visible stones and clinically insignificant residual stones ＜3 mm on a postoperative image study. Predictive factors for stone-free status were evaluated. Results: The immediate postoperative renal stone-free rate was 70%, which increased to 83 % at 1 month after surgery. The immediate postoperative ureteral stone-free rate was 100%. Among all renal stones, 15 (20.3%) were separately located in the renal pel-vis, 11 (14.8%) in the upper calyx, 15 (20.3%) in the mid calyx, and 33 (44.6%) in the lower calyx. The mean cumulative stone burden was 92.22±105.75 mm2. In a multi-variate analysis, cumulative stone burden ＜100 mm2 was a significant predictive fac-tor for postoperative renal stone-free status after 1 month (p＜0.01). Conclusions: Flexible URS can be considered simultaneously for both ureteral and re-nal stones in selected patients. Flexible URS is a favorable option that promises high stone-free status without significant complications for patients with a stone burden ＜100 mm2