<正>Objective:Nephron-sparing surgery（NSS） for small renal masses offers a similar functional and oncological outcome to that of radical surgery.Laparoendoscopic single-site surgery（LESS） emerges as an advanced alternative for reduced invasiveness and improves cosmesis;LESS is developing quickly and its indications have been expanded

but still in its infancy.The aim of this paper is to report our preliminary experience in transumbilical LESS partial nephrectomy（LESS-PN）

so as to assess its utility

safety and efficacy.Methods:From August 2009 to October 2010

3 patients underwent transumbilical LESS-PN via a novel multi-channel TriPort by a single experienced urologist in our institution.Patient demographics

perioperative and follow-up data were prospectively collected and analyzed.Results:All the three procedures were successfully completed.A 5-mm ancillary trocar was utilized in all 3 cases.The mean operative duration was 226.3（210-254 min） with an estimated blood loss of 56.7 ml （20-100 ml）.Mean warm ischemia time was 35.7 min（19-48 min）.One patient was transfused due to postoperative bleeding. The recovery was uneventful and mean length of postoperative stay was 13 days（12-14 days）.At the latest follow-up

all patients remained symptom-free and had normal renal function without evidence of recurrence

and they were delighted for a hidden transumbilical scar.Conclusion:Transumbilical LESS-PN is a feasible and safe procedure albeit extremely technically challenging.Surgical outcomes at a median follow-up of 2 years are promising

while currently it should be reserved for highly selected patients with favorable tumor anatomy and performed by a very experienced laparoscopic surgeon.