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What's known on the subject? and What does the study add?Renal stone size has traditionally been used as the primary predictor for residual fragments after retrograde intrarenal surgery (RIRS), and volume assessment is often overlooked in routine clinical practice.This prospective study highlights that stone volume may be a more accurate predictor of stone burden and residual fragments post-RIRS than stone size alone, suggesting the need for incorporating volumetric analysis into preoperative planning.