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Transanal surgery for early rectal cancer | CION Cancer Clinics
Transanal surgery removes a small, early rectal cancer through the anus, with no cut in the belly and without removing the rectum. It is only offered when the MRI and biopsy show the cancer has barely grown into the wall, because the lymph glands are left in place. This page explains which tumours qualify, what happens on the day, and what the laboratory report decides afterwards. CION Cancer Clinics’ surgical oncologists in Hyderabad can talk this through with you.
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Medically reviewed by Dr. Muralidhar MuddusettyConsultant Surgical Oncologist · MBBS (AIIMS), MS (Surgery, AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh) · last reviewed September 2026, next review due September 2027
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On this page
- What is transanal surgery for early rectal cancer?
- Which rectal cancers can be removed this way, and which cannot?
- What actually happens during transanal surgery?
- Words on the pathology report, in plain language
- What families say about the smaller operation, and what is true
- What this page cannot tell you, and what to ask your surgeon
- Common questions about transanal surgery
The short answer
What is transanal surgery for early rectal cancer?
Transanal surgery removes a small, early rectal cancer through the anus, without any cut in the belly and without removing the rectum. The surgeon takes out the tumour with a rim of healthy rectal wall around it, and you keep the rectum, the anus and normal bowel control.
Why it is only for early cancers
The operation removes the tumour and the wall it sits in. It does not remove the fatty tissue around the rectum, which holds the lymph glands. For a cancer that has only just started to grow into the wall, the chance of glands being involved is low enough that many teams accept this. Once a cancer has grown deeper, the glands are at risk, and the standard operation that removes the rectum and the glands together is needed instead.
The names you may hear
Transanal excision, TEM (transanal endoscopic microsurgery) and TAMIS (transanal minimally invasive surgery) are all versions of the same idea. The older method uses instruments through a wide tube. The newer ones use a small port and a camera, so the surgeon can reach higher up the rectum. Which one is used depends on where the tumour sits and what your centre is equipped for.
Not every centre offers transanal surgery, and not every early cancer is suited to it. This page cannot tell you whether your tumour qualifies.Who it is for
Which rectal cancers can be removed this way, and which cannot?
The decision is made on the MRI, the ultrasound through the anus and the biopsy, before anything is removed.
Small and shallow
The tumour has grown only into the inner layer of the rectal wall, which a report calls T1. It is small, and it takes up only part of the circle of the rectal wall. These are the cancers the operation was designed for.
Low-risk under the microscope
The biopsy shows cells that look close to normal, with no sign of cancer inside the small blood or lymph vessels. Those features tell the team the glands are unlikely to be involved.
Usually checked
- Grade of the cells
- Depth into the wall
- Vessel involvement
Reachable from below
The tumour has to be within reach of the instruments. Low and mid-rectal tumours usually are. Higher ones may need the camera-based method, or may be better removed the standard way.
Who it does not suit
Anyone whose tumour has grown through the wall, whose scan shows enlarged glands, or whose biopsy shows aggressive features. Removing only the tumour then leaves disease behind. For these people the standard operation is the safer choice, even though it is bigger.
Someone too unwell for the standard operation may be offered transanal removal as a compromise. The team will say so.Not sure whether this applies to you?
Ask an oncologistOn the day
What actually happens during transanal surgery?
Bowel preparation and anaesthetic
You will usually have an enema or a bowel-clearing drink the day before, and the operation is done under a general or a spinal anaesthetic. There is no cut on the skin anywhere.
The port goes in
A short tube or soft port is placed through the anus and the rectum is gently inflated with gas so the surgeon can see the tumour on a screen, in the same way keyhole surgery works inside the belly.
The tumour is removed
The surgeon cuts around the tumour with a margin of healthy wall, usually taking the full thickness of the wall beneath it. The piece is pinned out flat and sent to the laboratory whole, so the margins can be measured.
Closing and going home
The gap in the wall is stitched closed. Most people go home the same day or the next morning, eat normally within a day or two, and notice some bleeding or urgency for a few weeks while the wall heals.
On your report
Words on the pathology report, in plain language
- T1 and T2
- How deep the cancer has grown. T1 means the inner layer only. T2 means it has reached the muscle of the wall, and at that depth transanal removal alone is usually not enough.
- sm1, sm2, sm3
- A finer split of T1, describing how far into the inner layer the cancer reached. Deeper means a higher chance of gland involvement, and the team weighs this heavily.
- Lymphovascular invasion
- Cancer cells seen inside tiny blood or lymph vessels. If present, the glands are more likely to be involved, and a bigger operation may be advised.
- Margin
- The rim of healthy tissue around the removed piece. A clear margin means no cancer at the edge. A positive margin means cancer reached the edge and something was left behind.
- Completion surgery
- The standard rectal operation, done afterwards, because the removed piece showed higher-risk features than expected. It is not a sign that the first operation went wrong.
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Commonly believed
What families say about the smaller operation, and what is true
"It is a smaller operation, so it must be the safer one."
It is safer for the body on the day. It is only safer against the cancer when the tumour is truly early. For a deeper tumour, the small operation leaves glands untreated, and that is the bigger risk. Which is safer depends entirely on the stage.
"Once it is out, that is the end of it."
The laboratory report on the removed piece decides what happens next. If it confirms a low-risk cancer, the plan is follow-up. If it shows deeper growth, vessel involvement or a positive margin, the team may advise the standard operation or radiotherapy.
"We can ask for this to avoid the stoma."
Avoiding a stoma is a fair thing to want. It is not what makes a tumour suitable. The team can only offer this operation when the scans and biopsy say the cancer is early. Ask what your own reports show before asking for a particular operation.
"No cut means no recovery time."
Recovery is much quicker than after rectal removal, but the rectal wall still has a healing wound inside it. Some bleeding, urgency and discomfort on passing stool are usual for a few weeks. Heavy bleeding or fever are reasons to call the same day.
Being straight with you
What this page cannot tell you, and what to ask your surgeon
This page cannot tell you whether your cancer is early enough for transanal removal. That depends on your MRI, an ultrasound through the anus if one was done, and the biopsy, read together by the surgeon, the radiologist and the pathologist.
Questions worth asking
Ask what stage the scan suggests and how confident the team is in it. Ask what would happen if the laboratory report showed something worse than expected, and whether you would accept the bigger operation then. Ask how follow-up would run, because after a local removal the rectum is checked more often. Ask which method the centre uses and how often they do it.
What the page also cannot say
It cannot tell you how likely the cancer is to come back after either operation, because that depends on features only the final report shows. And it is not advice to have or to avoid any operation. That decision belongs to you and your treating team.
If you have been offered transanal surgery and want the reports explained in plain words, call the helpline. A surgical oncologist will go through them with you.Questions we are asked
Common questions about transanal surgery
Is transanal excision the same as a polyp removal during colonoscopy?
No. A colonoscopy snare takes a polyp off the surface. Transanal surgery removes a disc of the full rectal wall beneath the tumour, with a margin, so the pathologist can measure how deep the cancer went and whether the edges are clear. It needs an anaesthetic and a theatre, not just a scope room.
Will there be a stoma?
Not for the operation itself. Nothing is disconnected, so there is no join to protect and no bag. A stoma only enters the picture if the laboratory report later shows the cancer was deeper than expected and the standard rectal operation is advised.
How long is the hospital stay?
Usually a night or less. Many people go home the same day once they have passed urine and eaten. You may notice a little blood with stool and some urgency for a few weeks. Your surgeon will tell you what is expected and what would need a call.
What if the report says the margin is positive?
It means cancer reached the cut edge and some may have been left behind. The team then discusses the options, which usually include the standard rectal operation and sometimes radiotherapy. It is a known outcome of local removal, planned for from the start, not a failure of the operation.
Can this be done after chemoradiation instead of the big operation?
In some programmes, yes. Where a tumour has shrunk to a small scar after radiotherapy, some teams remove that area through the anus to check for remaining cancer, as part of keeping the rectum. This is a specialised approach and not routine everywhere. Ask your team whether it applies to you.
Will bowel control change afterwards?
The anal muscles are stretched by the port, and some people notice a little leakage or urgency in the first weeks. For most this settles. It is far less than the change after a low join, which is one of the reasons the operation is offered when the cancer allows it.
Does CION do transanal surgery?
Whether any particular centre offers a particular method is a question to put directly to that centre, along with how often they do it. Bring your MRI and biopsy reports. The more useful first step is to find out whether your tumour is early enough for it at all.
How will the cancer be watched afterwards?
More closely than after a standard operation, because the rectum is still there. Expect examinations and a scope through the anus at set intervals, with MRI scans and blood tests, for several years. Your surgeon will give you the schedule. Keeping every appointment is what makes the smaller operation safe.
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Dr. Muralidhar Muddusetty
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
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Dr. Vinay Mamidala
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Dr. Vajja Sandeep Kumar
MBBS, MS (General Surgery), DrNB (Surgical Oncology), FALS Oncology
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Sources
- American Cancer Society — Surgery for Rectal Cancer
- National Cancer Institute — Rectal Cancer Treatment (PDQ) - Patient Version
- Cancer Research UK — Surgery for bowel cancer
- NICE — Colorectal cancer (NG151)
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
Rectal Cancer Surgery: What Your Options AreWhere local removal sits among the other operationsWatch and Wait Instead of Rectal SurgeryThe other way of keeping the rectumTotal Mesorectal Excision: Why It MattersThe standard operation that removes the glands as wellThe Pathology Report After SurgeryHow to read the report that decides the next stepFollow-Up After Rectal Cancer SurgeryHow the rectum is watched afterwards
Talk to us
Been offered transanal surgery, or wondering if it applies?
Send us your MRI and biopsy reports or call the helpline. A surgical oncologist will explain what stage they suggest and which operations are on the table. One helpline serves every CION centre.