Study of clinical strategy of transanal endoscopic microsurgery in patients with colon or rectal tumor YIN Lu， LIN Mou-bin, HUA Zhi-li, et al.Department of Surgery，RuiJin Hospital，Medical school of shanghai Jiaotong University, Shanghai200025, China. Corresponding author: YIN Lu，Email:yindalu@yahoo.com.cn Abstract Objective To evaluate the feasibility of transanal endoscopic microsurgery and discuss the possible difficulties during the operation. Methods The data of 36 patients undergoing transanal endoscopic microsurgery during the period September 2006 to June 2008 in Ruijin hospital were reviewed. Results Transanal endoscopic microsurgery was successfully performed in all the patients. There was no procedure converted to laparotomy. The average operative time was 71(20~200) min. The histologic diagnosis indicated 1 inflammatory mass, 22 adenomas, 5 carcinoids, 8 carcinomas. The average hospital stay after transanal endoscopic microsurgery was 4.7(3~9) days. There was no operation-related mortality. Complications included rectal bleeding (n=1),flatus incontinence (n=1). There was one local recurrence which was found in the 5 month. Conclusion Transanal endoscopic microsurgery is an effective, safe and minimally invasive surgical technique leading to a short hospital stay and less complications. Therefore, transanal endoscopic microsurgery can achieve similar or better consequence than traditional surgery.