Fig. 1

Surgical approach. a The rectum was fully exposed with an anal retractor, then the tumor lesion location was confirmed and the level of incision in the lumen was accurately decided. b The rectal lumen was tightly occluded, and a full-thickness circumferential dissection was performed. c The glove single-port platform was constructed by the surgical gloves and trocars. d The specimen was extracted through the anus