Renal Lithiasis Treatment with Ureterorenoscopy: Single center experience


  • Luísa Cerqueira Serviço de Fisiologia e Cirurgia Cardiotorácica, Faculdade de Medicina da Universidade do Porto, Porto, Portugal
  • Rui J Cerqueira Serviço de Fisiologia e Cirurgia Cardiotorácica, Faculdade de Medicina da Universidade do Porto, Porto, Portugal
  • Paulo Dinis, Prof. Dr. Faculdade de Medicina da Universidade do Porto, Porto, Portugal; Serviço de Urologia, Hospital de São João, Porto, Portugal



Kidney Calculi, Treatment Outcome, Ureteroscopy, Urolithiasis


Introduction: In this study, we evaluated the initial results of this procedure in our hospital, aiming to evaluate retrograde intrarenal surgery efficacy and safety and possible success predictors of this technique.

Material and Methods: After collecting data from the medical records and imaging studies of all patients undergoing retrograde intrarenal surgery in 2014 e 2015 at Centro Hospitalar de São João, and applying our exclusion criteria, we analyzed the data of 138 patients (total of 179 retrograde intrarenal surgery). The primary outcomes of our study were the immediate success rate, assessed by the surgeon’s perception intraoperatively, and postoperative success rate, assessed by image control. Residual lithiasis was considered significant in the presence of calculi > 3 mm.

Results: The overall success rate was 67.0%, considering the surgeon’s perception. Considering the image control, the success rate was 66.7% for calculi smaller than 150 mm2 and located outside the ICG, but smaller in other locations or bigger calculi. In the univariate analysis, stone burden, calculi number and location were statistically significant predictors of retrograde intrarenal surgery success.

Conclusion: Location in the ICG was considered a predictor of retrograde intrarenal surgery failure and, in this location, RIRS was more effective for calculi < 150 mm2; this differenced was not encountered for calculi outside the ICG. It is a safe intervention, which allows a staged use.


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