Medical Oncologist
CION Cancer Clinics
Endoscopic resection for large colon polyps | CION Cancer Clinics
A large colon polyp can usually be removed from the inside during a colonoscopy, using a technique called EMR. Fluid is injected under the polyp to lift it, and a wire loop takes it away. There is no cut on the abdomen and most people go home the same day. This page explains what decides whether EMR is possible, what happens on the day, and why a check scope follows. CION Cancer Clinics’ surgical oncologists in Hyderabad can talk this through with you.
MI
Medically reviewed by Dr. Mohammed ImaduddinConsultant Surgical Oncologist · MBBS, MS (General Surgery), MCh (Surgical Oncology) · last reviewed September 2026, next review due September 2027
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On this page
- What does EMR for a large colon polyp actually involve?
- What does the endoscopist look at before choosing EMR?
- What happens from bowel preparation to going home?
- Four things families tell us about large polyps, and what is true
- Words on the colonoscopy and pathology report, in plain language
- What this page cannot tell you
- Common questions about EMR for a large colon polyp
The short answer
What does EMR for a large colon polyp actually involve?
EMR, or endoscopic mucosal resection, removes a large polyp from the inside of the bowel during a colonoscopy. There is no cut on the abdomen. Fluid is injected under the polyp to lift it away from the bowel wall, and a wire loop cuts it free. Most people go home the same day.
Why the fluid injection matters
The bowel wall is thin. The injected fluid forms a cushion underneath the polyp, so the loop takes the polyp and a little lining and leaves the muscle untouched. If the polyp does not lift, that is a warning sign, and the endoscopist will usually stop and take samples instead.
Why a large polyp is handled differently
A small polyp comes away in one snip. A large one often has to be taken in several pieces, called piecemeal EMR. That makes the edges harder to check, so the site is looked at again some months later. Some large polyps are better removed in one piece by ESD, a slower technique not every centre offers. Ask which method your centre would use.
Who it does not suit
EMR is for polyps still within the lining. If the surface suggests a cancer has grown deeper, an operation is usually recommended instead.
Needing EMR does not mean you have cancer. Most large polyps are not. It means leaving the polyp is the greater risk.Before the decision
What does the endoscopist look at before choosing EMR?
Four things decide whether a large polyp can be taken from the inside, and by which method.
Size
Larger polyps are more likely to hide a small area of cancer, to need piecemeal removal, and to need a second look afterwards. Size alone rarely rules EMR out.
Shape
A polyp on a stalk is the easiest to remove, because the stalk keeps the cut away from the wall. A flat or spreading polyp needs the lifting injection and more skill.
Terms you may see
- Pedunculated, meaning on a stalk
- Sessile, meaning flat against the wall
- Laterally spreading, meaning wide and flat
Surface pattern
Under magnification and coloured light, the surface pattern gives a strong clue about whether cancer has started to grow down into the wall. A disturbed pattern, a firm ulcer, or a polyp that will not lift all point towards an operation rather than EMR.
Where it sits
Polyps on the right side of the colon sit on a thinner wall. Polyps wrapped around a fold, near the appendix opening, or very low in the rectum are harder to reach and hold. None of these rule EMR out, but they may change who does it and where.
Not sure whether this applies to you?
Ask an oncologistOn the day
What happens from bowel preparation to going home?
Bowel preparation
You drink a clearing solution the evening before and sometimes again in the morning, so the polyp can be seen clearly. A poorly prepared bowel is the commonest reason a planned EMR is postponed.
Sedation and the scope
Most people have sedation through a drip and remember little. Some centres use a light general anaesthetic for a long or difficult polyp. Your anaesthetist decides this with you.
Lifting and removal
Fluid is injected under the polyp, and a wire loop removes it in one piece or several. The wound edges may be treated with heat to lower the chance of regrowth, and clips may be placed to reduce bleeding.
Retrieval, tattoo and home
Every piece goes to the pathologist. A small permanent ink mark is often placed beside the site so it can be found again at the check scope or, if needed, by a surgeon. You go home once the sedation has worn off, with someone to accompany you.
Commonly believed
Four things families tell us about large polyps, and what is true
"A polyp this big must already be cancer."
Most large polyps are still benign, meaning not cancer, when removed. Size raises the chance that a small area of cancer is hiding inside, which is exactly why the polyp is taken out and examined rather than watched. The pathology report settles it.
"If it is big, an operation is safer than a scope."
Removing a segment of bowel is a major operation with its own risks and a longer recovery. For a polyp still within the lining, removal through the scope is usually considered first. An operation is right when the polyp cannot be removed safely from inside, not simply because it is large.
"Once it is out, that is the end of it."
A large polyp removed in pieces can leave a few cells that regrow. That is why a check colonoscopy is planned and the site is marked with ink. Missing that check undoes much of the benefit.
"We should get a second opinion before letting them remove it."
A second opinion is reasonable and your team will not mind. What matters is that the polyp is not left for months while opinions are collected. Take the colonoscopy report and any pathology with you.
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On your report
Words on the colonoscopy and pathology report, in plain language
- Adenoma
- The commonest kind of polyp, and the kind that can slowly turn into cancer if left. Removing it is the point of the procedure.
- Dysplasia
- Cells that look abnormal under the microscope but have not grown into the deeper wall. High-grade is a step further along than low-grade, and is still not an invasive cancer.
- Laterally spreading lesion
- A wide, flat polyp grown along the surface rather than up on a stalk. These are the polyps most often removed by EMR or ESD.
- Non-lifting sign
- The polyp did not rise on the fluid cushion. It often means scar or deeper growth underneath, and usually rules out removal from inside.
- Piecemeal
- Removed in several pieces. The report says this so the check scope is planned correctly.
- Tattoo
- A spot of permanent ink placed in the bowel wall beside the site so it can be found again. It is harmless.
Being straight with you
What this page cannot tell you
This page cannot tell you whether your own polyp can be removed by EMR. That depends on what the endoscopist sees on the day, under magnification. It cannot tell you whether the polyp contains cancer. Only the pathology report can.
What may change after the pathology report
If the report shows a benign polyp with clear edges, the next step is usually a check colonoscopy and nothing more. If it shows an area of cancer, the team looks at how deep it went and whether it was cut clear. An operation may then still be recommended. That is not a failure of the EMR. The EMR is what found the cancer early.
What recovery usually looks like
Most people eat lightly that evening and return to normal food over the next day or two. Some bloating, mild cramping and a little blood on the first stool are common. Heavy bleeding, worsening abdominal pain, a fever or a hard swollen belly are not, and need same-day attention.
What to ask before you agree
Ask whether the polyp will come out in one piece or several, what happens if it contains cancer, and when the check scope will be.
Send us your colonoscopy report and photographs. A CION surgical oncologist will tell you whether the next step is a scope or an operation.Questions we are asked
Common questions about EMR for a large colon polyp
Is EMR for a large polyp painful?
The bowel lining has no pain nerves, so the removal itself is not felt. What people notice is bloating from the gas used to open the bowel, and some cramping afterwards. Both settle within hours in most cases. With sedation, most people remember little of the procedure at all.
Will I have to stay in hospital?
Usually not. Most EMR procedures are day cases, and you go home once the sedation has worn off and you have passed urine and taken fluids. A very large polyp, a polyp on the thin right side of the colon, or a health condition of your own may lead the team to keep you overnight.
How will I know if the polyp was cancer?
From the pathology report, which usually takes several working days. The report states whether cancer is present, how deep it went and whether the edges are clear. Your endoscopist or surgeon will go through it with you. Do not try to read it alone at night.
Why do I need another colonoscopy afterwards?
Because a large polyp removed in pieces can leave a few cells behind that regrow. The check scope looks at the tattooed spot, takes samples if needed, and removes any regrowth while it is small. Your endoscopist sets the timing from how the polyp came out and what the pathology showed.
I take a blood thinner. Can I still have it done?
Often yes, but the plan around your medicine has to be made in advance. Tell the team about every tablet you take, including aspirin, clopidogrel, warfarin and the newer blood thinners. Your cardiologist, endoscopist and anaesthetist decide together what to pause and when. Never stop a blood thinner on your own.
What if the polyp cannot be removed through the scope?
The endoscopist takes samples, marks the site with ink, and refers you to a surgical oncologist. The usual next step is a keyhole or open operation to remove that segment of bowel. Being turned down for EMR means the polyp needs a different tool, and the tattoo makes the surgeon's job easier.
Can this be done in Hyderabad, or do we need to travel?
EMR for large polyps is done in several centres in Hyderabad. What varies is experience with very large or flat polyps, and whether ESD is available. Ask your centre how often they remove polyps of this size and what they do when one turns out to be more complex than expected.
Is it covered by Aarogyasri or my insurance?
Often yes. Aarogyasri, CGHS, ECHS and EHS each have their own rules, and most cashless insurers ask for pre-approval with the colonoscopy report attached. Call the helpline and we will check your cover before you book.
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Sources
- NHS — Bowel polyps
- Cancer Research UK — Colonoscopy
- American Cancer Society — Surgery for colon 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
EMR and ESD ExplainedThe two techniques compared in more detailComplex Polypectomy Instead of ColectomyWhen a scope can replace a bowel operationReading the Endoscopic Resection Specimen ReportWhat the pathology report words meanSurveillance After Endoscopic ResectionWhy the check scope matters and when it happensDeciding on Cancer SurgeryWhat the team weighs when an operation is recommended
Talk to us
Been told your polyp is too large for a simple snip?
Send us the colonoscopy report and any photographs. A CION surgical oncologist will tell you whether the next step is a scope or an operation, and what to ask your centre.