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To assess the safety, feasibility, and efficacy of a modified process we developed in order to perform decortication surgeries for simple renal cysts through a percutaneous approach, 18 patients with simple renal cysts larger than 5 cm were treated with our new technique, from November 2016 to January 2019. All of the cysts were evaluated with ultrasonography and contrast-enhanced computed tomography. The Surgical procedure: as the standard mini-Percutaneous Nephrostomy procedure, a puncture was made directly into the cyst through the cyst roof under ultrasound guidance. After the inner cyst wall examination, the sheath was then retracted to just outside the cyst roof. The sheath together with the scope was used to detach the roof from the perirenal fat, after which the cyst roof was resected using a laser. A drain tube was left in the retroperitoneal space for 1-2 days. Subsequently, all patients were discharged 1 to 2 days post-surgery. Skin incision was less than 1 cm. No major complication was observed. The follow-up time ranges from 14 to 37 months. One case had an incompletely resected cyst with the cyst volume being decreased by more than 60%. This patient didn't receive any additional treatments during his follow-up. For all the other patients, the cysts had completely disappeared and no relapse had occurred. In conclusion, in the selected patients with a simple posterior renal cyst, our new technique is a safe and an effective option. It is also considered the least invasive decortication surgery for posterior renal cyst.

Percutaneous nephrostomic decortication: a microinvasive surgery for posterior renal cyst