For cancer in the left colic flexure both the middle and left colic arteries have to be divided centrally.
As a minimum, the intestine on the right side of the transverse colon to the transition descending colon/sigmoid is resected. In emergencies, and possibly in those cases where the transverse/sigmoid anastomosis does not fall nicely, the entire right colon is removed and an ileo/sigmoid anastomosis is performed.