1.5 cm stone in the lower calyx flexible ureteroscopy versus percutaneous nephrolithotomy. IntroductionLiatsikos, Evangelosa,bCurrent Opinion in Urology: September 2019 - Volume 29 - Issue 5 - p 556 doi: 10.1097/MOU.0000000000000631 POINT-COUNTERPOINT Free Author InformationAuthors Article OutlineOutline Article MetricsMetrics aUniversity of Patras, Rion, Patras, Greece bMedical University of Vienna, Vienna, Austria Correspondence to Evangelos Liatsikos, MD, PhD, University Hospital of Patras, Rion, Patras 26504, Greece. E-mail: firstname.lastname@example.org Acknowledgements Financial support and sponsorship Conflicts of interest REFERENCES Lower pole stones (LPS) are defined as stones located in the inferior pole calyx of the kidney and are the most common renal stones. These stones usually require some kind of active treatment as these are less likely to pass spontaneously . The optimal treatment of LPS with a size of 1–2 cm represents a point of debate among the endourologists. A variety of factors, such as the anatomy of the pelvicalyceal system, patient body habitus, and patient preference may influence the selection of the treatment method . Both percutaneous nephrolithotomy (PNL) and retrograde intrarenal surgery (RIRS) have been reported to be effective in the management of these lower pole stones with advantages and disadvantages associated with both the approaches [2–4]. Two well recognized experts, Dr Ghani and Dr Skolarikos will support RIRS and PNL for the management of LPS with a maximal diameter of 1.5 cm, respectively. Back to Top | Article Outline Acknowledgements None. Back to Top | Article Outline Financial support and sponsorship None. Back to Top | Article Outline Conflicts of interest There are no conflicts of interest.Back to Top | Article Outline REFERENCES 1. Donaldson JF, Lardas M, Scrimgeour D, et al. Systematic review and meta-analysis of the clinical effectiveness of shock wave lithotripsy, retrograde intrarenal surgery, and percutaneous nephrolithotomy for lower-pole renal stones. Eur Urol 2015; 67:612–616. Cited Here... 2. Skolarikos A, Gross AJ, Krebs A, et al. Outcomes of flexible ureterorenoscopy for solitary renal stones in the CROES URS Global Study. J Urol 2015; 194:137–143. Cited Here... 3. Knoll T, Jessen JP, Honeck P, Wendt-Nordahl G. Flexible ureterorenoscopy versus miniaturized PNL for solitary renal calculi of 10-30 mm size. World J Urol 2011; 29:755–759. Cited Here... 4. Turk C, Petrik A, Sarica K, et al. EAU Guidelines on interventional treatment for urolithiasis. Eur Urol 2016; 69:475–482. Cited Here... Copyright © 2019 Wolters Kluwer Health, Inc. All rights reserved.