Comparison between Micro- and Ultramini- Percutaneous Nephrolithotomy for the Treatment of 10-20 mm Kidney Stones in Preschool Children

Abstract

The incidence of kidney stones in children has steadily increased in recent years. Miniaturized percutaneous nephrolithotomy (PCNL) techniques, such as micro-PCNL and ultramini-PCNL, have become increasingly prevalent in pediatric kidney stone treatment due to their high stone clearance rate and low complication rate. In this study, we aim to compare the efficacy and safety of micro-PCNL and ultramini-PCNL in preschool children with 10–20 mm kidney stones. We conducted a retrospective analysis of data from 64 children under 6 years who received micro-PCNL and ultramini-PCNL surgeries in our hospital between January 2020 and January 2024. Patient demographics, stone characteristics, and intra/postoperative parameters were analyzed. There were 33 patients in micro-PCNL group and 31 patients in ultramini-PCNL group, with a mean age of 3.1 ± 1.3 years and 3.6 ± 1.8 years (p = 0.208), respectively. The stone size was 15 ± 4 mm in the micro-PCNL group and 16 ± 4 mm in the ultramini-PCNL group (p = 0.326). Micro-PCNL and ultramini-PCNL groups showed comparable stone free rates (84.8% vs. 87.1%, p = 0.796) and procedure times (49 ± 17 vs. 54 ± 23, p = 0.218). However, a significantly shorter hospitalization period was observed in the micro-PCNL group compared with the ultramini-PCNL group (2.3 ± 1.3 days vs. 4.6 ± 2.2 days, p < 0.001). Complications were similar between groups, with 12.4% in micro-PCNL group and 16.1% in ultramini-PCNL group and no severe hematuria was observed. In preschool children with 10–20 mm kidney stones, both micro-PCNL and ultramini-PCNL achieve similarly high stone-free rates with minimal complications. However, micro-PCNL, characterized by a smaller tract size, offers the additional advantage of shorter hospital stays.