For a tumor larger than 2 cm, a hemicolectomy may be recommended. This is the removal of a portion of the colon next to the appendix; removal of nearby blood vessels and lymph nodes is often done at the same time. A right hemicolectomy is surgery performed on the right side of the colon. Even though a large amount of the large intestine is removed, the operation usually does not result in the need for a colostomy or stoma, which is an opening in the abdomen through which the bowel contents are emptied into a bag.