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The colon, or large bowel, has three sides: the ascending colon (right side), the transverse colon, and the descending colon (left side). Patients with colon cancer and colorectal cancer may have hemicolectomy. Surgery to remove part of the colon or large intestine is called hemicolectomy or sigmoid colectomy. Depending on where the cancer is located will determine which side of the colon is removed.


The primary treatment for colon cancer is surgery. The part of the large bowel with cancer is removed, along with surrounding lymph nodes. Removal of the colon is called a colectomy. The remaining bowel is then joined together. Joining the bowel is called an anastomosis. When cancer is found in the ascending colon, the right side is removed. The colon is then joined to the small intestine.

At Cedars-Sinai, the majority of colon and rectal operations are performed using minimally invasive techniques (laparoscopy). The benefits of minimally invasive surgery include less pain after surgery, faster return of bowel function, quicker healing, less scarring and fewer days in the hospital to recover. Laparoscopy, however, may not be suitable for all patients. Ask your surgeon if you are an appropriate candidate for minimally invasive surgery.



After the surgeon removes the section of the colon, a pathologist evaluates the cancer under a microscope. If the pathologist sees evidence that cancer has spread to the lymph nodes, or if the cancer is a type that grows quickly, the oncologist will usually recommend further treatment with chemotherapy.

Follow-up Care

Bowel movements might be more frequent after a colectomy, but usually become more normal after one year. Your doctor can recommend a bowel care plan to help normalize bowel movements.

The most common time a cancer recurs is within the first two years following diagnosis and treatment. Follow-up care with the surgeon, gastroenterologist and oncologist is important. Periodic checkups may include a physical exam, blood tests, colonoscopy, CT scan or PET scan.

© 2000-2022 The StayWell Company, LLC. All rights reserved. This information is not intended as a substitute for professional medical care. Always follow your healthcare professional's instructions.
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