RESULTS• Mean tract size was 18.2 ± 2 F (15-20) and 26.8 ± 2 F (24-30), P value < 0.0001 in the miniperc and standard PNL, respectively. Holmium LASER and pneumatic lithotripter were the main energy sources used in miniperc and standard PNL, respectively.• Miniperc operative time was longer than that of standard PNL (45.2 ± 12.6 vs 31 ± 16.6 min, P = 0.0008 respectively).• Conversely, there was an advantage of miniperc over standard PNL in terms of a significantly reduced hemoglobin drop (0.8 ± 0.9 vs 1.3 ± 0.4 gram%, P = 0.01), analgesic requirement (55.4 ± 50 vs 70.2 ± 52 mg tramadol, P = 0.29) and hospital stay (3.2 ± 0.8 vs 4.8 ± 0.6 days, P ≤ 0.001), respectively.• Intra-operative conversion of the procedure into a tubeless PNL was significantly more in the miniperc group ( P ≤ 0.001). The miniperc and standard PNL group had clearance rates of 96% and 100%, respectively at 1 month follow up. CONCLUSIONS• This study demonstrated significant advantages of the miniperc procedure in terms of reduced bleeding leading to a tubeless procedure and reduced hospital stay.• The stone free rates and the complications were similar in either group. What's known on the subject? and What does the study add? Standard PNL is known to have higher clearance rates for stones 1-2 cm. However, it is not promoted because of its associated morbidity, especially bleeding. Minitiarization of the PNL has spawned a new interest in this modality for treating small bulk urolithiasis. KEYWORDSThe study adds to a growing body of evidence in a prospective manner that smaller tract PNL "miniperc" is associated with a similiar efficacy of achieving stone-clearance rates while decreasing the invasiveness of the procedure and associated morbidity. OBJECTIVE
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