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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
