Colonic Stenting

Overview

A colonic stent is a small metal tube — like a tiny wire mesh scaffold — that is placed inside your blocked bowel to prop it open. Mr Nguyen positions it using a camera (a colonoscope) and X-ray guidance at the same time, so there's no need for a large incision. Once in place, the stent gently expands and restores the flow through the bowel.

If you're having this as a first step before an operation (called a "bridge to surgery"), stenting gives you time to recover and be properly assessed, rather than having emergency open surgery. In some situations — when surgery is not the right path for you — stenting can also be used as a long-term measure to keep you comfortable and avoid a permanent colostomy (a bag).

Who needs this procedure?

• Your large bowel has become suddenly blocked by a colorectal cancer, and a stent is needed to open it up while surgery is being planned ("bridge to surgery")
• Surgery is not the right option for you right now, and a stent can relieve your symptoms and maintain your quality of life (palliation)
• The cancer has come back at a previous bowel join and is causing a blockage
• A narrowing (stricture) in the large bowel from a non-cancerous cause, in selected cases
• You were admitted as an emergency with a blocked bowel and the team wants to avoid an emergency operation and colostomy
• You need a few weeks to build up your nutrition and fitness before a major cancer operation

Benefits

• Avoids emergency surgery — and the emergency colostomy (bag) that often comes with it
• Gives your body and your medical team breathing room: time to do full staging scans, improve your nutrition, and plan the safest surgical approach
• Works in more than 9 out of 10 cases — a very high technical success rate
• No large incision — the stent is placed through the bowel camera, so you just need sedation, not general anaesthesia
• Much shorter hospital stay compared with emergency open surgery
• For patients who aren't having surgery, stenting can allow you to eat normally and avoid a permanent bag

Risks & considerations

• Stent migration — the stent can occasionally slip out of position, which happens in about 1 in 10 cases. It can usually be repositioned or replaced.
• Perforation (a small tear in the bowel wall) — this is the most serious risk, occurring in 4–5% of cases. The risk is higher if you're on a chemotherapy drug called bevacizumab. If this happens, it requires urgent treatment.
• Re-obstruction — the stent can become blocked again as the tumour grows through the mesh. This happens in roughly 1 in 7 patients by 6 months and can usually be treated by placing a second stent inside the first.
• Bleeding — uncommon and usually minor.
• Discomfort from the stent expanding — some patients feel pressure or cramping for a day or two after the procedure. This typically settles on its own.
• Theoretical concern about tumour spread — some research has raised questions about whether stenting before surgery might allow small numbers of cancer cells to spread. This is still debated by experts and will be discussed with you if it's relevant to your situation.

Before the procedure

• You'll be admitted to hospital — because your bowel is blocked, this procedure is nearly always done as an inpatient
• A drip (IV fluids) will be started to rehydrate you and correct any salt imbalances
• A CT scan of your abdomen and pelvis will be done to see exactly where the blockage is and plan where to place the stent
• Mr Nguyen will talk you through the procedure, the risks, and what the alternatives are — including emergency surgery — so you can give informed consent
• Blood tests will be taken, including checks on how well your blood clots
• Where possible, your case will be reviewed by a cancer team (oncology and colorectal MDT — a group of specialists who discuss your care together) before the stent is placed

On the day

• A sedation (relaxing medication through your drip) is given by the anaesthetist so you're comfortable and drowsy throughout — you won't need a general anaesthetic
• A colonoscope (a flexible camera) is gently guided through the bowel to reach the blockage, while X-ray guidance (fluoroscopy) is used at the same time to help with precision
• A fine wire is passed through the narrowed area under X-ray to create a pathway
• The stent is placed over the wire and deployed — it opens up on its own, like a spring, and holds the bowel open
• Mr Nguyen confirms the stent is in the right position and the blockage is relieved before finishing
• You'll be monitored in hospital afterwards, and your diet will be slowly built back up as your bowel starts working again

Recovery & aftercare

• Day 0–1: You'll be monitored closely for any signs of complications such as pain, bleeding, or perforation. Most patients feel relief from their blockage symptoms quite quickly.
• Days 1–3: Your bowel should progressively start working again. Fluids are introduced first, then soft food, and then a normal diet as you tolerate it.
• Going home: Most patients are ready to leave hospital within 3–7 days, depending on how things settle.
• If stenting was your bridge to surgery, your oncology team will complete your staging scans and the MDT will meet to confirm the plan for your operation — usually within 3–6 weeks.
• If you're not having surgery, Mr Nguyen and your oncology team will continue to follow up with you in clinic to monitor the stent and manage your care.

Related patient guides

Helpful articles written for patients and their families on topics related to this procedure.