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Abstract Background: Urolithiasis has a well documented common occurrence in the general population. Percutaneous nephrolithotomy (PCNL), has prevailed over other more morbid procedures, like open surgeries in the management of such stones PNL in complex renal stones is a challenging procedure because it requires considerable experience in gaining percutaneous tracts, performing delicate and judicious intrarenal manipulations, mastering all techniques of intracorporeal stone disintegration, and weighing the benefits of complete stone clearance against the risks of complications. Aim of the Work: GSS and Nephrolithometric Nomogram. Scoring system in predicting PCNL outcomes. The ability of the GSS and STONE score to correlate with the post-operative change in the quality of life. Patients and Methods: In a non-randomized prospective study we evaluated the two scoring systems Guy’s and S.T.O.N.E. nephrolithometry scoring systems in predicting the success rate of PCNl and the quality of life. This study included 100 patients with renal stones who were scheduled for PCNL at El Demerdash University Hospitals and Nasser institute hospital in the period from April 2017 to October 2018. Results: Our study included 100 patients (34 were female, 66 were male) with a mean age of 46.16 (range from 28 to 68). The mean GUY score was 1.57± 0.73 and the mean STONE score was 5.76± 1.19.the overall stone free rate was 89% with a complication rate of 18% with a mean stone burden <400 mm.GUY and STONE score were able to predict SFR and complications after PCNL. Conclusion: Both GSS and S.T.O.N.E Nephrolithometry Score can be used to stratify the complexity of renal stone before PCNL to predict the stone clearance and complication. Both can be valuable tools for providing uniformity for comparison of outcome, proper planning of the surgery and preoperative counseling of the patient. |