Understanding colorectal cancer surgery types and why they differ
Colorectal cancer surgery involves removing cancerous tissue from the colon or rectum, with the precise procedure depending on where the tumour is located, its size and stage, and the patient’s overall health. Understanding colorectal cancer surgery types can help patients know why different operations may be recommended and what factors can influence the surgical approach. In Australia, an estimated 14,784 people were diagnosed with colorectal cancer in 2025, highlighting the importance of understanding available treatment pathways. Surgery is commonly used to treat colorectal cancer, although chemotherapy, radiotherapy or other treatments may also form part of an individual’s care plan.
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The goal of surgery is generally to remove the cancer along with an appropriate amount of surrounding tissue, while preserving as much healthy bowel function as possible. For colon cancer, this may involve removing a segment of the colon and reconnecting the remaining bowel. Rectal cancer can require different procedures because of the rectum’s location and its close relationship with the pelvic organs and anal sphincter. In some circumstances, a temporary or permanent stoma may also be required. In 2025, colorectal cancer was estimated to have an age-standardised incidence rate of 53 cases per 100,000 people in Australia, demonstrating the continuing significance of bowel cancer as a national health concern.
Understanding the main colorectal cancer surgery types
- Colectomy for colon cancer: It removes the section of colon containing the cancer along with nearby tissue and lymph nodes, after which the remaining bowel may be joined together when clinically appropriate.
- Segmental bowel resection: It removes the affected portion of the bowel while keeping healthy sections, with the extent determined by the tumour’s position and the need to achieve appropriate surgical margins.
- Rectal cancer surgery: Operations for rectal cancer remove the affected part of the rectum and surrounding tissue, with the procedure influenced by tumour location and its relationship to nearby structures.
- Local tumour removal: Small, early rectal tumours may sometimes be removed locally without a major bowel resection when specialist assessment indicates that this can provide appropriate cancer treatment.
Exploring how the surgical approach can vary
- Open colorectal surgery: Open surgery uses a larger abdominal incision to reach the bowel and may be considered when the operation is complex or when the circumstances make this approach appropriate.
- Laparoscopic surgery: Laparoscopic surgery uses several small incisions, a camera and specialised instruments to perform the operation and may offer benefits such as smaller wounds and a shorter recovery.
- Robotic-assisted surgery: A less invasive technique in which instruments are controlled through a robotic system, with suitability depending on the procedure, patient and available surgical expertise.
- Selecting the right technique: The approach is determined by factors including tumour location, cancer stage, previous abdominal surgery, general health and the surgeon’s experience with the procedure.
Exploring how the surgical approach can vary
- Open colorectal surgery: Open surgery uses a larger abdominal incision to reach the bowel and may be considered when the operation is complex or when the circumstances make this approach appropriate.
- Laparoscopic surgery: Laparoscopic surgery uses several small incisions, a camera and specialised instruments to perform the operation and may offer benefits such as smaller wounds and a shorter recovery.
- Robotic-assisted surgery: A less invasive technique in which instruments are controlled through a robotic system, with suitability depending on the procedure, patient and available surgical expertise.
- Selecting the right technique: The approach is determined by factors including tumour location, cancer stage, previous abdominal surgery, general health and the surgeon’s experience with the procedure.
Understanding factors that influence surgical decisions
- Considering cancer stage: The stage helps determine whether surgery is appropriate and whether additional treatment such as chemotherapy or radiotherapy may be recommended before or after the operation.
- Assessing tumour location: Whether the cancer is in the colon or rectum, and its exact position, can influence how much bowel needs to be removed and whether normal bowel continuity can be restored.
- Reviewing overall health: Existing conditions, physical fitness, nutritional status and prior operations can influence surgical planning, recovery and the level of support required during treatment.
- Discussing individual priorities: Treatment may also consider expected bowel function, stoma requirements, recovery factors, and the patient’s preferences when different approaches are clinically appropriate.
Understanding bowel reconnection and stoma surgery
- Reconnecting the bowel: After the cancerous section has been removed, the healthy bowel may be joined in an anastomosis when this can be performed safely and is appropriate for the patient’s circumstances.
- Using a temporary stoma: A temporary ileostomy or colostomy may be created to divert bowel contents and protect a healing bowel connection, with reversal considered later when clinically appropriate.
- Creating a permanent stoma: Some rectal cancers necessitate removal of the anus and rectum, meaning a permanent colostomy might be necessary to provide an alternative route for bowel movements.
- Preparing for stoma care: When a stoma is required, patients can receive practical guidance about its management, helping them understand how it may affect daily routines during recovery and beyond.
Understanding bowel reconnection and stoma surgery
- Reconnecting the bowel: After the cancerous section has been removed, the healthy bowel may be joined in an anastomosis when this can be performed safely and is appropriate for the patient’s circumstances.
- Using a temporary stoma: A temporary ileostomy or colostomy may be created to divert bowel contents and protect a healing bowel connection, with reversal considered later when clinically appropriate.
- Creating a permanent stoma: Some rectal cancers necessitate removal of the anus and rectum, meaning a permanent colostomy might be necessary to provide an alternative route for bowel movements.
- Preparing for stoma care: When a stoma is required, patients can receive practical guidance about its management, helping them understand how it may affect daily routines during recovery and beyond.
Preparing for recovery after colorectal cancer surgery types
- Expecting different timelines: Recovery depends on the operation performed, the surgical technique, general health and if further cancer treatment is required. Individual recovery can differ considerably.
- Monitoring possible complications: Surgical teams monitor for risks such as bleeding, infection, blood clots, bowel changes and anastomotic leakage, with individual risks discussed before treatment begins.
- Gradually returning to activity: Early movement is advised after surgery, while returning to work, driving, exercise and other normal activities should follow the treating team’s advice and recovery progress.
- Continuing follow-up care: This includes reviewing pathology results, monitoring recovery and discussing further treatment where required, helping ensure care remains appropriate after the operation.
Specialist care when colorectal cancer surgery is being considered
A colorectal cancer diagnosis can raise practical questions about which operation may be appropriate, how much bowel may need to be removed and what recovery could involve. These decisions are not based on the diagnosis alone. A specialist assessment considers the characteristics of the cancer alongside the patient’s anatomy, medical circumstances and treatment goals to develop an appropriate surgical plan.
Sydney Gut Clinic offers specialist evaluation and management for conditions involving the colon and rectum. Patients can discuss their diagnosis and potential colorectal cancer surgery types pathways with a specialist who can explain the available options and what each may involve. For patients requiring assessment or management of a colorectal condition, colorectal surgery provides access to specialist care tailored to the individual’s circumstances.
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FAQs
What is the most common type of surgery for colon cancer?
A colectomy, also known as a large bowel resection, is commonly performed for colon cancer. The section removed depends on where the tumour is located, and the remaining bowel may be reconnected when appropriate.
Are colorectal cancer surgery types different for colon and rectal cancer?
Yes. Colon and rectal cancers can require different operations because of their anatomical locations. Rectal cancer surgery may involve more complex considerations around the pelvic structures and anal sphincter, while the type of colon resection depends largely on the tumour’s location within the colon.
Will I need a stoma after colorectal cancer surgery?
Not everyone needs a stoma. In some operations, the bowel can be reconnected after the cancerous section is removed. A temporary or permanent stoma may be required when reconnecting the bowel is not considered safe or when the operation involves removal of the rectum and anus.
Is keyhole surgery possible for colorectal cancer?
Laparoscopic surgery can be used for selected colorectal cancer operations. It involves smaller abdominal incisions than traditional open surgery and may offer benefits for appropriate patients. Whether it is suitable depends on the cancer, the planned operation, the patient’s circumstances and available specialist expertise.
Does colorectal cancer always require surgery?
Surgery is an important treatment for many patients with colorectal cancer, particularly when the cancer can be removed. However, treatment is individualised and may also involve chemotherapy, radiotherapy, targeted therapies or other treatments depending on the cancer’s stage and characteristics.