This is an interesting series of percutaneous nephrostolithoto-mies in 45 renal units in the pediatric age group. The author(s) divide their patients into 3 groups, with group 1 representing children younger than 8 years of age, whereas groups 2a and 2b were ages 8-16, with 2a requiring pediatric instrumentation and 2b using adult-sized nephroscopes. Their stone-free clearance rates (81%-83% with percutaneous techniques, 92%-94% with combined percutaneous and ESWL therapy) were quite good and comparable to those reported in other series.
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