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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 TriPortTM 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.