Fig. 2

Dissection range of the oral mesentery. A For mesenteric resection on the oral side, the lymph nodes along IMA to SRA were dissected, and LCA was cut. B The mesentery was excised using a vessel sealer to an area of at least 10 cm proximal to the tumor. IMA, inferior mesenteric artery; SRA, superior rectal artery; LCA, left colic artery, S, sigmoid artery