Methylene blue-guided retroperitoneoscopy technique: alternative for percutaneous nephrolithotomy in cases with renal access failure

Objective: To present our ‘methylene blue-guided retroperitoneoscopy technique’ that we apply in cases where extravasation develops for various reasons and is complicated as a result Percutaneous Nephrolithotomy surgery (PNL). Material Methods: A total of 36 patients, who underwent PNL with the blue at Bakirkoy Dr. Sadi Konuk Training Research Hospital between 2014 2020, were retrospectively evaluated. The study included only which was used due to inability advance Amplatz sheath targeted calyx renal scarring or staghorn stone filling calyx, withdrawn from kidney guidewire inattention assistant surgical team contrast material extravasation. patients’ demographic, preoperative, perioperative, postoperative data recorded, stone-free complication rates noted. Results: mean age patients 45.1 (36-55) years, body mass index 27.8±4 kg/m2, size 3.4±0.7 cm, volume 22.3±10.2 cm3. operation time calculated 95.8±30.3 minutes. rate 68% on first day 75% third month. Eight (22.2%) secondary procedure (extracorporeal shock wave lithotripsy flexible ureterorenoscopy). Conclusion: under retroperitoneoscopic direct vision safe practical option re-accessing by locating partially completely dilated. Keywords: methylene blue, retroperitoneoscopy, access failure, percutaneous nephrolithotomy