RESUMEN
<p><b>OBJECTIVE</b>To evaluate the efficacy and safety of management of renal stone in non-dilated collecting system by percutaneous nephrolithotripsy (PCNL) under ultrasound guidance.</p><p><b>METHOD</b>From September 2003 to April 2005, 132 cases of renal stone in non-dilated collecting system were performed by percutaneous nephrolithotripsy. A stent was first inserted into the pelvis through cystoscope, and saline was instilled to dilate collecting system. Antegrade percutaneous access was obtained by B-type ultrasound guidance. A combination pneumatic and ultrasonic lithotrite were used to disintegrate and remove stone under direct vision. Clinical data including operation time, complications and stone free rate were analyzed retrospectively.</p><p><b>RESULTS</b>The percutaneous renal access was successfully established under B-type ultrasound guidance in all patients, immediate phase I lithotripsy was performed in 129 cases and delayed phase II lithotripsy in 3 cases. Operation time ranged from 70 to 130 minutes, average time was (89 +/- 11) minutes, 3 cases were supported by blood transfusion, severe complications did not occur during nephrolithotripsy. Stones were cleared in 114 out of 132 cases (86.4%) during immediate phase I lithotripsy, residual stone fragment was found in 18 cases who received second PCNL or adjuvant extracorporeal shock wave lithotripsy.</p><p><b>CONCLUSION</b>The management of renal stone in non-dilated collecting system using PCNL appears to be efficacious and safe under B-type ultrasound guidance.</p>