Safety of Mid and Low Rectal Cancer Surgery Without Dissection of the No.253 Lymph Node (S-M-O-O-T-H)
The goal of this clinical trial is to learn about whether it is safe to omit dissection of the No.253 lymph nodes in mid and low rectal cancer surgery. The main question it aims to answer is that if it is possible to achieve the same long-term survival with and without the dissection of the No.253 lymph node in mid and low rectal cancer surgery. Participants will underwent laparoscopic rectal radical resection with or without the dissection of the No.253 lymph node.