Fig. 3

A Trocars position. B The descending colon was on the medial side of the left kidney. C The congenital adhesion of the sigmoid colon was lost to the left abdominal wall, and the left ureter and reproductive vessels were exposed outside the mesentery. D The sigmoid colon mesentery adhered to the ileocecum. E The sigmoid colon adhered to the ileal mesentery to block IMA exposure. F Take a sling to bind the rectum and mesentery and lift it from the caudal to the cranial to expand the retro rectal space. G IMA exposure through a cephalic intermediate approach. H The IMA branches were dissected and classified. I The specimens were taken out through a paraumbilical incision