Rirs Technique
The patients in this group were placed in the lithotomy position, and a semirigid ureteroscope (Karl Storz 9-11F, Tuttlingen, Germany), followed by a9.5-11-F access sheath (Boston Scientific, USA)were inserted with a through a sensor guide (PTFE-Nitinol Guidewire with Hydrophilic Tip, Boston Scientific, Marlborough, USA) under fluoroscopy control. The stone was accessed using a flexible ureteroscope (7,95 F Olympus, USA), and fragmentation was performe dusing Holmium YAG laser with 272-µm laser fibers(Quanta System, Litho Holmium, YAG Laser, Turkey).Large fragments were extracted using a 1.7 F retrieval basket (Zerotip, Boston Scientific Corp, Natick, MA, USA).