To evaluate the clinical efficacy, indications and safety of super-mini percutaneous nephrolithotomy (SMP) in the treatment of kidney stones.

Clinical data of 26 patients with renal stones and treated by SMP in the People’s Hospital of Longhua District Shenzhen from January 2016 to February 2017 were reviewed respectively. The study group was consisted of 18 males and 8 females, aged from 28 to 60 years and the mean age was (44.0 ±2.8) years. The diameters of stones ranged from 1.5 cm to 2.7 cm and the mean stone diameter was (2.1 ± 0.6) cm. The cases of stones in the subrenal calyx, midrenal calyx, renal pelvic and renal pelvic combined subrenal calyx were 10, 4, 10, 2, respectively.

Twenty five patients were successfully managed by SMP at one time, and one patient needed the adjuvant therapy of the extracorporeal shock wave lithotripsy (ESWL). The operative time ranged from 45 to 130 min. The mean hemoglobin drop was (13.5 ± 8.4) g/L and no transfusion was needed. There were 2 cases (7.7%) treated with nephrostomy tube after the operation and 5 cases (19.2%) treated with double J stent because of the larger renal stones (initial period) and the other 19 cases (73.1%) were not treated with nephrostomy tube or double J stent. The postoperative hospital stay ranged from2 to 5 days and no serious complications occured. The stone-free rate (SFR) after 24 hours and 3 months were 76% (20/26) and 100%, respectively.

SMP is safe and effective for the management of renal stones about 2 cm.