it is an interventional single arm study for treating pediatric renal stones≤2cm by FURS and Holmium laser fragmentation.pediatric groups is benig compared for stone free rate, complication rate , success rate. 3 groups of children . group 1 up to 6 years, group 2 from 7 to 12 years , group 3 from 13 to 18 years
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stone free rate
Timeframe: within 2 months after intervention