... with a residual stone surface area ≤50% of baseline after the first ESWL, while the efficacy rate was 32.4% for other patients. The efficacy was 92.2% for stones ≤400 mm 2 and those with lower radiodensity, as determined by a plain (KUB) film. Conclusions: For renal stones with a surface area ≤400 mm 2...