<正>Objective:To describe two cases of bilateral transumbilical laparoendoscopic single-site（LESS） surgeries in a single operative session and assess the safety

feasibility and efficacy.Methods:One patient underwent right ureterolithotomy and left varicocelectomy

and the patient was performed with right simple nephrectomy for nonfunctioning kidney due to ureteral calculus and left ureterolithotomy using a novel multichannel TriPort? via a single 2-3 cm transumbilical incision. Results:The right-side ureterolithotomy and left-side varicocelectomy were finished in 229 minutes

with a total estimated blood loss of 50 ml.The right-side simple nephrectomy and left-side ureterolithotomy in the other patient were finished in 340 minutes

with a total estimated blood loss of 100 ml.There were no major complications.At the latest follow-up

both patients remained symptom-free and there were no evidences of recurrence.Both of them were delighted for the single scar. Conclusion:Synchronous LESS urologic procedure via a single umbilical incision is technically feasible

safe and efficacious with a promising potential.