Colorectal Cancer Surgery

What colorectal cancer is

Colorectal cancer describes cancers arising in the lining of the colon or of the rectum, its final segment. It is one of the most frequently diagnosed cancers worldwide. The great majority develop slowly, over years, from benign growths called polyps that gradually undergo malignant change. That slow progression is precisely why screening works so well in this disease.

Symptoms depend on where the tumour sits. A lasting change in bowel habit, blood or mucus in the stool, abdominal pain and bloating, a sense of incomplete emptying, unexplained anaemia and weight loss are the usual presentations; tumours in the right side of the colon can go a long time with anaemia as their only sign. Risk rises with age, and a family history of colorectal cancer or polyps, long-standing inflammatory bowel disease, smoking, excess weight, physical inactivity and a diet high in processed meat are the other recognised contributors.

Why screening matters so much here

Colorectal cancer is one of the few cancers that screening can prevent rather than merely detect. Polyps found during colonoscopy can be removed in the same session, which interrupts the sequence before a cancer ever forms. Tumours that are found are generally caught earlier, when the range of treatment options is wider.

For people without additional risk factors, screening is generally recommended from around 45 to 50 years of age. Those with a family history of colorectal cancer or of multiple polyps may need to begin earlier and be re-examined more often, so the plan should be set with a doctor rather than assumed. Screening is also not a substitute for investigating symptoms: rectal bleeding, a persistent change in bowel habit or unexplained anaemia call for colonoscopy regardless of age.

What the operation removes

In colorectal cancer surgery, removing the tumour is only part of the task. The blood vessels supplying that segment of bowel, and the lymph nodes strung along them, must come out as well. The operation therefore takes the tumour together with its bowel segment, the vascular pedicle at its root and the surrounding lymphatic tissue, after which the two ends of the bowel are joined — an anastomosis — to restore continuity.

Which segment is removed depends on the tumour's location: right hemicolectomy, left hemicolectomy, sigmoid resection, or low anterior resection for rectal tumours. In rectal cancer the standard is total mesorectal excision, in which the rectum is removed intact within the envelope of fat and lymphatic tissue that surrounds it. Performing that dissection along the correct plane matters both for the oncological result and for preserving the pelvic nerves that govern bladder and sexual function.

• Removal of the tumour-bearing segment with its vascular pedicle and lymph nodes
• Restoration of bowel continuity by anastomosis
• Total mesorectal excision for rectal cancer
• A temporary protective stoma where a low join needs to be protected while it heals

Lymph nodes and accurate staging

Most treatment decisions in colorectal cancer follow from the pathological examination of what was removed at surgery. How deeply the tumour penetrated the bowel wall, and how many of the retrieved lymph nodes contain tumour, define the true stage — which is why retrieving an adequate number of nodes is used as a marker of the quality of the operation itself.

Accurate staging determines whether chemotherapy is recommended afterwards. For many early-stage patients, surgery alone is sufficient; where nodes are involved, additional treatment usually enters the discussion. In rectal cancer the order is often reversed, with radiotherapy and chemotherapy given before the operation. All of these decisions are made in a multidisciplinary tumour board.

Laparoscopic surgery, and the stoma question

Colorectal cancer is one of the best-established fields for laparoscopic surgery. The operation is carried out through several small incisions, and the resected bowel is delivered by slightly extending one of them. The oncological content is unchanged: the same segment, the same vascular root and the same lymphatic tissue are removed.

Because the abdominal wall is disturbed far less, pain after surgery is generally lower, bowel function tends to return sooner and patients are usually up and moving earlier — and early mobilisation and early feeding are among the strongest influences on how recovery goes. In the pelvis, the magnified view a camera provides deep in a narrow space is a genuine technical advantage during rectal dissection.

The question patients ask most often is about a stoma. A stoma brings the bowel out to the abdominal wall so that stool collects in a bag, and it is not required in most colon cancer operations. For tumours low in the rectum, a temporary stoma is sometimes created to protect a fresh join while it heals, and is usually closed a few months later. A permanent stoma is needed only in specific circumstances — typically when the tumour involves the anal sphincter — and that possibility is always discussed openly beforehand.

Recovery and long-term surveillance

Getting up and moving early, doing breathing exercises and resuming food as soon as the surgical team allows all shorten recovery. Bowel habit is often irregular for a while; after rectal surgery in particular, patients may notice more frequent motions and a greater sense of urgency. How long this lasts varies from patient to patient, and it tends to improve substantially over the months that follow.

Surveillance in colorectal cancer runs for years, combining clinical review, blood tests including tumour markers, imaging and repeat colonoscopy at set intervals. The purpose is twofold: to detect any recurrence early, and to find and remove new polyps before they become a problem.

Everything set out here is general information. The type of operation, whether a laparoscopic approach is appropriate and the order in which treatments are given are decided for each patient individually, after examination and review of the investigations. Our surgeons see patients at İzmir Cerrahi Merkezi in Konak, İzmir.