Role of Preoperative Renal Stone Complexity Assessment by Guy's Stone Score as a Predictor of Percutaneous Nephrolithotomy Outcomes.

Introduction: Various nephrolithometric scoring systems have recently emerged to predict the outcomes of percutaneous nephrolithotomy (PCNL). However, there is no consensus upon an ideal tool. The current study aimed to assess the correlation between Guy's stone score (GSS) and PCNL outcomes.