Conclusion
In predicting SFS after fURS, the T.O.HO. score has better predictive ability than the STONE score. The modified T.O.HO. score, which was created by adding the stone area parameter, was able to better predict SFS after fURS. Based on these results, we consider that the modified T.O.HO. score can be used effectively in ureteral and renal stones without losing its practicality. Our study proved the efficacy of the modified T.O.HO. score in predicting SFS but there is a need for large-series studies with a prospective design to validate it.