Medical Oncologist
CION Cancer Clinics
Types of colon polyp: adenoma, hyperplastic, serrated and the rest | CION Cancer Clinics
Most colon polyps are either adenomas or hyperplastic polyps. Adenomas and some serrated polyps are precancerous, which means they could slowly become cancer if left in place, while small hyperplastic polyps are almost always harmless. This page explains each type you may see on a pathology report, how the type is decided, and why it is only one of the things that set your next colonoscopy date. At CION Cancer Clinics, our specialists help you judge which bowel symptoms need tests and plan screening that fits your risk.
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Medically reviewed by Dr. Naresh GunduConsultant Medical Oncologist · MBBS, DNB (Internal Medicine), DM (Medical Oncology, AIIMS) · last reviewed October 2026, next review due October 2027
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On this page
- How many kinds of colon polyp are there, and which ones matter?
- Adenoma, hyperplastic, serrated or something else?
- What happens between the colonoscopy and knowing the type?
- Four things people say about polyp types, and what is true
- What this page cannot tell you
- Common questions about types of colon polyp
The short answer
How many kinds of colon polyp are there, and which ones matter?
A polyp is a small growth on the inner lining of the colon. Nearly all polyps fall into two families: adenomas, which can slowly turn into cancer if left alone, and serrated polyps, most of which are harmless hyperplastic polyps but a few of which can also turn. A third, smaller group covers inflammatory and hamartomatous polyps, which are almost never a cancer worry on their own.
Why the type is decided under a microscope
The doctor doing the colonoscopy can often guess the type from its shape, colour and surface pattern. The guess is not the answer. Every polyp that is removed goes to a pathologist, and the word on that report decides what happens next. That is why a polyp found on colonoscopy does not get a label until the report comes back, usually a week or two later.
Who this page is for
It is for anyone holding a colonoscopy or biopsy report with a word such as adenoma, hyperplastic or serrated on it, and for the family member trying to work out whether to worry. It is not for someone who has already been told cancer was found inside a polyp. That is a different situation with its own page on cancer found in a removed polyp.
A polyp is not cancer. Most polyps never become cancer. The type tells your doctor how closely to watch you.The four groups
Adenoma, hyperplastic, serrated or something else?
These are the names you will meet on a report. Each one carries a different level of concern and a different follow-up.
Adenomas
The most common polyp type and the one most colon cancers grow from. An adenoma is precancerous, which means it is not cancer now but could become cancer over many years. Removing it ends that risk for that polyp.
Sub-types on a report
- Tubular, the commonest and lowest concern
- Tubulovillous, a mix of the two patterns
- Villous, the pattern most likely to hold cancer
Hyperplastic polyps
Small, pale and usually found low down in the sigmoid colon and rectum. Almost all are harmless and most doctors treat a few small hyperplastic polyps as no more worrying than a skin tag. They sit in the serrated family but are its gentle member.
A small hyperplastic polyp usually does not shorten your interval to the next colonoscopy.Sessile serrated lesions
Flat, pale polyps, often in the right side of the colon, that are easy to miss and can be mistaken for hyperplastic polyps. They can turn into cancer by a different route from adenomas, so they are treated as precancerous and watched in the same way.
Also in this group
- Traditional serrated adenoma, uncommon
- Serrated lesions with dysplasia, watched more closely
Inflammatory and hamartomatous polyps
Inflammatory polyps form where the lining has been damaged, often in people with ulcerative colitis or Crohn's disease. Hamartomatous polyps, such as juvenile polyps, are overgrowths of normal tissue. Neither is precancerous on its own, though many of them together can point to an inherited syndrome.
Not sure whether this applies to you?
Ask an oncologistFrom finding to follow-up
What happens between the colonoscopy and knowing the type?
The polyp is seen
During colonoscopy the doctor notes where each polyp sits, roughly how big it is and whether it is flat or on a stalk. You may be told how many were found on the day, but not yet what they are.
It is removed in the same sitting
Most polyps are snared or clipped off during the same examination. Very large or awkwardly placed polyps may need a planned second procedure. CION arranges the colonoscopy at a partner endoscopy unit.
It goes to the pathologist
Each polyp is sent in its own labelled pot so the report can say what was found at each site. The pathologist names the type, the pattern and whether any dysplasia, meaning abnormal cells, is present.
The report is read with the colonoscopy findings
Type, size, number and location are read together. One small tubular adenoma and three large villous adenomas lead to very different advice, even though both reports say adenoma.
A surveillance interval is set
Your doctor tells you when the next colonoscopy should be and writes it down. The logic behind that date has its own page on surveillance intervals.
Did you know
Flat serrated polyps on the right side of the colon are the ones most often missed, because they are pale and sit close to the lining. A good bowel preparation matters more for finding these than for any other polyp type, which is why the preparation instructions are worth following exactly.
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Commonly believed
Four things people say about polyp types, and what is true
"Adenoma means I have cancer."
It does not. Adenoma means precancerous, a growth that could become cancer in the future if nobody removed it. It has been removed. The word tells your doctor to watch you, not to treat you for cancer.
"Hyperplastic is just another word for adenoma."
They are different families. A small hyperplastic polyp low in the colon is one of the least worrying findings a colonoscopy can produce. Sessile serrated lesions, which look similar, are the ones in that family that need watching.
"If the doctor said it looked benign, I do not need the report."
The look is a guess. The report is the answer. Flat serrated lesions in particular can pass for harmless on the screen. Ask for the written pathology report and keep it with your colonoscopy report for the next doctor.
"One polyp type means one kind of follow-up."
Type is only one of four things that set your interval. Size, number and whether abnormal cells were seen matter as much. Two people with the same word on the report can be told very different dates for their next colonoscopy, and both can be right.
Being straight with you
What this page cannot tell you
It cannot tell you which type your polyp was. Only the pathology report can, and the words on it only make sense alongside the size, the number and where each polyp sat. If you have the report, the page on reading a colon polyp result walks through it line by line.
It cannot set your next colonoscopy date
Guidelines give ranges, and doctors adjust them for your age, your family history and how clean the bowel was on the day. A polyp that was removed in pieces, or a colonoscopy that did not reach the whole colon, can shorten the interval regardless of type. Ask the doctor who did the procedure, and if the answer is unclear, a CION oncologist can review the reports with you.
Who this does not apply to
If you have been told you have many polyps, or polyps from a young age, the ordinary type-by-type logic does not apply. That pattern can point to an inherited condition such as familial adenomatous polyposis, and the page on when polyposis is suspected is the one to read. Polyps found in long-standing colitis are also judged differently.
Bring the colonoscopy report and the pathology report together. One without the other leaves the doctor guessing.Questions we are asked
Common questions about types of colon polyp
Which type of polyp is most likely to become cancer?
Adenomas with a villous pattern, large adenomas and any polyp with high-grade dysplasia carry the most concern. Sessile serrated lesions are treated as precancerous too. Even in these groups most polyps never become cancer, and removal ends the risk from that polyp.
Is a hyperplastic polyp anything to worry about?
A few small hyperplastic polyps in the lower colon are usually not. Many of them, large ones, or ones higher up in the colon are looked at more carefully, because they can be confused with sessile serrated lesions. Your doctor will say whether they change your follow-up.
What is the difference between tubular and villous?
They describe the pattern the cells make under the microscope. Tubular adenomas form small tube shapes and are the commonest and least worrying. Villous adenomas form finger-like fronds and are more likely to hold abnormal cells. Tubulovillous sits between the two.
Can the doctor tell the type during the colonoscopy?
Experienced endoscopists can often make a good guess from the surface pattern, and some units use special light settings to help. The guess is not the answer. The pathologist's report decides the type, and your follow-up should be based on the report, not the impression on the day.
Does polyp type matter more than polyp size?
Neither wins on its own. A large tubular adenoma can be more worrying than a tiny villous one. Doctors read type, size, number and dysplasia together, which is why the page on polyp size is worth reading alongside this one.
What does sessile mean on my report?
Sessile means flat or broad-based, sitting directly on the lining. The opposite is pedunculated, a polyp on a stalk like a mushroom. Sessile polyps can be harder to remove completely, which is one reason the doctor may want to look again sooner.
My report says inflammatory polyp. Is that precancerous?
On its own, no. Inflammatory polyps are scar-like growths where the lining has healed after damage, often in colitis. What matters more is the condition behind them, because long-standing colitis has its own surveillance rules that your gastroenterologist will explain.
Should my family be checked because I had an adenoma?
One or two small adenomas found at an ordinary age usually do not change advice for relatives. Large or many adenomas, or adenomas at a young age, can. The page on family screening after polyps explains when relatives should ask.
Your Specialists
Meet CION's colon cancer specialists. Bring your colonoscopy, scan or biopsy report.
Our surgical and medical oncologists plan colon cancer care together: which operation, whether chemotherapy is needed, and the follow-up that comes after.
Medical Oncologist
Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
Medical Oncologist
Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
Medical Oncologist
Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
Medical Oncologist
Medical Oncologist
Surgical Oncologist
Dr. Muralidhar Muddusetty
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
Surgical Oncologist
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Sources
- NHS — Bowel polyps
- NIDDK (NIH) — Colon Polyps
- MedlinePlus — Colon Polyp
- National Cancer Institute — Screening Tests to Detect Colorectal Cancer and Polyps
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
Adenomatous polyps and cancer riskThe polyp type most colon cancers grow from, explained in depthSerrated and hyperplastic polypsWhich serrated polyps are harmless and which need watchingPolyp surveillance intervals explainedHow your polyp type turns into a date for the next colonoscopyAre all polyps precancerous?A quick answer for the worry behind most polyp searches
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