Urinary stone diseaseis less common in pediatric age group and it has anincreasing incidence. In this study, our hypothesis is toevaluate if one of the techniques, PNL or RIRS is superiorthan the other in terms of stone free status (SFR), fluoroscopytime (FT), operation time (OT), complication rate(CR), JJ stent insertion rate, and hospitalization duration(HD) in children.