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Abstract Stone impaction is a major issue in the management of ureteral stones as it may lead to failure of spontaneous passage of the stones and response to medical expulsive therapy (MET). Moreover, ureteroscopic lithotripsy (URSL) may be more difficult to perform in patients with impacted stones with a higher risk of developing intra-operative complications, resulting in adverse surgical outcome (poor stone free rate) and postoperative complications. Therefore, there is a need to identify preoperative factors predictive of stone impaction and the need for immediate URSL or advanced surgical techniques |