Rectal cancer surgery can be technically challenging because the rectum lies deep within the pelvis, a confined space surrounded by important nerves, blood vessels and other structures. The surgeon must remove the cancer while aiming to preserve surrounding structures and, where possible, maintain normal bowel function.
Robotic-assisted surgery is one approach that may be used for selected patients. It allows the surgeon to control specialised instruments through small abdominal incisions while viewing the operating area through a magnified, three-dimensional camera. However, it is important to understand what the technology can and cannot do, and whether it is appropriate for a particular cancer.
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What Is Robotic Rectal Cancer Surgery?
The rectum is the final section of the large intestine, ending at the anus. Rectal cancer surgery aims to remove the tumour together with an appropriate margin of surrounding tissue and the lymph nodes that may contain cancer cells.
In robotic-assisted surgery, the surgeon makes several small incisions in the abdomen. A camera and specialised instruments are inserted through these openings. The surgeon sits at a console and controls the instruments using hand and finger movements. The camera provides a magnified, three-dimensional view of the operating area.
The robotic system translates the surgeon’s movements into precise movements of the instruments inside the body. It does not make decisions, identify cancer independently or perform the operation without the surgeon.
Depending on the tumour’s location and stage, the operation may involve removing part or all of the rectum, together with the surrounding fatty tissue and lymph nodes. For many rectal cancer operations, this includes a procedure known as total mesorectal excision (TME), in which the rectum and its surrounding tissue are removed along the appropriate anatomical plane.
Why Can Rectal Cancer Surgery Be Challenging?
The rectum is located deep within the pelvis, a relatively narrow space surrounded by bones, muscles, nerves, blood vessels and other organs. This can make surgery technically demanding, particularly when the tumour is low in the rectum or when the patient has a narrow pelvis.
The anal sphincter muscles are also important considerations. These muscles help control the passage of stool and gas. If a tumour is close to or involves the sphincter, the surgeon must assess whether it is possible to remove the cancer while preserving these muscles safely.
Robotic instruments have articulated tips that can move in several directions. Together with the magnified camera view, these features may assist the surgeon when performing detailed dissection in the confined pelvic space.
However, the technical features of a robotic system are only one part of the operation. Careful planning, the surgeon’s training and experience, the cancer’s characteristics and adherence to established cancer surgery principles remain essential.
How Is Robotic Rectal Cancer Surgery Planned?
Before surgery is considered, the care team needs to establish the location and extent of the cancer. Assessment commonly includes a colonoscopy and biopsy to confirm the diagnosis. Magnetic resonance imaging (MRI) of the pelvis is particularly useful for assessing the rectal tumour and its relationship to surrounding structures.
Computed tomography (CT) or positron emission tomography (PET) scans may be performed to check whether the cancer has spread to other parts of the body. Blood tests and an assessment of the patient’s general fitness may also be required.
Some patients with locally advanced rectal cancer are advised to undergo treatment before surgery. This may include radiotherapy with chemotherapy, or chemotherapy and radiotherapy delivered in a planned sequence. Such treatment is known as neoadjuvant therapy.
The purpose may be to minimized the risk of local recurrence, reduce the size or extent of the tumour and help guide the subsequent operation. The recommended treatment sequence depends on the cancer stage, MRI findings, tumour characteristics and the patient’s circumstances.
A multidisciplinary team may be involved in planning treatment. This can include colorectal surgeons, medical oncologists, radiation oncologists, radiologists, pathologists and specialist nurses.
What Happens During The Operation?
Robotic rectal cancer surgery is performed under general anaesthesia. The surgeon inserts a camera and robotic instruments through small incisions in the abdomen. The robotic system is positioned beside the operating table, while the surgeon controls the instruments from the console.
The surgeon carefully separates the rectum and surrounding tissue from nearby structures. The section containing the tumour is removed, together with the relevant lymph-node-bearing tissue. The remaining bowel may then be reconnected, if this is considered safe and appropriate.
The connection between two sections of bowel is called an anastomosis. If the join is low in the pelvis, the surgeon may recommend a temporary stoma to divert stool while the join heals.
Not every patient can have the bowel reconnected. If the tumour involves the anal sphincter, or if an adequate cancer margin cannot be achieved while preserving it, an abdominoperineal resection may be recommended. This operation removes the anus and sphincter muscles and requires a permanent colostomy.
The decision depends on the tumour and the need for adequate cancer clearance, rather than simply on whether robotic surgery is being used.
Potential Benefits And Limitations Of Robotic Surgery
Robotic surgery provides the surgeon with a magnified, three-dimensional view and instruments with articulated tips. These features may be useful when operating deep within the pelvis, where movement can be restricted.
However, robotic surgery should not be described as automatically safer or more effective than laparoscopic or open surgery. Research comparing robotic and conventional laparoscopic rectal cancer surgery has not established that the robotic approach is superior for every important outcome.
The choice of surgical approach may also depend on the surgeon’s experience, the patient’s anatomy, previous abdominal operations, the extent of the tumour and the resources available at the hospital.
Robotic surgery may involve longer operating times or higher costs in some settings. An operation that begins using a minimally invasive approach may also need to be converted to open surgery if the surgeon considers this safer.
The priority is complete and safe cancer removal, not completing the operation through small incisions at all costs.
Recovery And Possible Risks
Recovery varies according to the extent of surgery, the patient’s general health and whether complications occur. Patients are usually encouraged to begin moving as soon as it is safe. The care team will guide the gradual return to eating and drinking.
Possible complications include bleeding, infection, blood clots, bowel obstruction, injury to nearby organs and leakage from the bowel join. Pelvic surgery can also affect nerves involved in urinary and sexual function.
Some patients experience changes in bowel habits after rectal surgery. These may include more frequent bowel movements, urgency, difficulty emptying the bowel or episodes of leakage. The degree of change varies between individuals.
A stoma may be temporary or permanent. Even when a temporary stoma is planned, reversal is not guaranteed. Healing, complications, further cancer treatment and the patient’s overall fitness can affect whether it is safe to close the stoma.
Follow-up appointments allow the team to review recovery and discuss the final pathology report. Depending on the cancer stage and findings after surgery, further treatment such as chemotherapy may be recommended.
Who May Be Considered For Robotic Rectal Cancer Surgery?
A robotic approach may be considered for patients who need rectal cancer surgery and are suitable for minimally invasive surgery. Factors include the tumour’s location and extent, previous abdominal or pelvic operations, body habitus, other medical conditions and the surgeon’s assessment.
Patients can ask whether robotic, laparoscopic or open surgery is being proposed and why. It is also useful to discuss the planned operation, whether treatment is needed before surgery, the possibility of a temporary or permanent stoma, and the potential effects on bowel, bladder and sexual function.
The most appropriate approach is the one that allows the care team to achieve the required cancer operation safely and effectively. A consultation should include a discussion of alternatives, expected recovery and possible complications.
Related Content
- Colorectal Surgery In Singapore: Keyhole / Laparoscopic Surgery For Colorectal Cancer Treatment
- How Does Robotic Colorectal Surgery Improve Outcomes For Patients?
Health365 Preferred Doctor You Can Consider
Dr Lee Kuok Chung of Crest Surgical Practice is a health365 Preferred Doctor whose clinical focus includes robotic colorectal surgery, particularly for colorectal cancer, as well as benign colorectal and perianal conditions.
Patients considering surgery for rectal cancer may wish to discuss their diagnosis, staging results and proposed treatment plan with a colorectal surgeon. A consultation can help clarify whether robotic, laparoscopic or open surgery is appropriate, what the operation involves, and whether a temporary or permanent stoma may be needed.
Further information about Dr Lee’s clinical background is available through his health365 doctor profile. Patients can use a consultation to discuss the potential benefits, limitations, risks and alternatives relevant to their circumstances.
Contact MedicalTravel.asiaFrequently Asked Questions
No. The surgeon performs the operation and controls the robotic instruments. The aim is to remove the tumour and the relevant surrounding tissue and lymph nodes. The robotic system assists with instrument control and visualisation; it does not identify or remove cancer independently.
No. A stoma may be needed temporarily to protect a bowel join or permanently if the anus and sphincter muscles must be removed to achieve adequate cancer clearance. The tumour’s position and extent are important factors.
Not for every patient or every outcome. Robotic surgery has technical features that may help in selected operations, but evidence has not established universal superiority. The recommended approach should reflect the cancer findings, the surgeon’s expertise and the patient’s circumstances.
This medical content has been reviewed by Dr Lee Kuok Chung, a highly experienced colorectal surgeon specialising in minimally invasive and robotic surgery for colorectal cancer and complex perianal conditions. He is also one of the few surgeons in Singapore skilled in advanced endoscopic techniques such as EMR and ESD, allowing large polyps and early cancers to be removed without major surgery.
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