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CION Cancer Clinics
Serrated and hyperplastic polyps: what they mean and how much they matter | CION Cancer Clinics
A sessile serrated polyp, now usually called a sessile serrated lesion, is a flat precancerous growth that could slowly turn into cancer if left in place. Removing it, which is usually done during the colonoscopy, deals with that polyp, and the finding mainly brings your next colonoscopy forward. Hyperplastic polyps belong to the same serrated family, but small ones are almost always harmless. This page explains the difference and what happens next. 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
- What does a sessile serrated polyp mean for my risk?
- Hyperplastic, sessile serrated or traditional serrated: what is the difference?
- What happens after a serrated polyp is found at colonoscopy?
- What do the words on a serrated polyp report mean?
- Four things people assume about serrated polyps, and what is true
- What this page cannot tell you
- Common questions about serrated and hyperplastic polyps
The short answer
What does a sessile serrated polyp mean for my risk?
A sessile serrated polyp is a flat growth in the lining of the colon that could, over many years, turn into cancer. That makes it precancerous, in the same broad group as adenomas. Once it has been removed whole, that polyp is gone. What remains is a higher chance of new polyps, which is why your next colonoscopy comes sooner.
The serrated family, in one line
Under the microscope, every serrated polyp has a saw-tooth edge to its glands, which is where the name comes from. The family runs from the harmless to the important. Small hyperplastic polyps sit at the gentle end. Sessile serrated lesions and the rarer traditional serrated adenomas are the members that matter.
Why this group gets its own attention
Most colon cancers grow from adenomas. A smaller but real share grow through what doctors call the serrated pathway instead. These polyps tend to be flat, pale and coated in mucus. They favour the right side of the colon, where the bowel is wide and leftover stool is common. That makes them easier to miss than a raised adenoma, and it is why a report naming one is taken seriously.
Precancerous describes what a polyp could become if left alone. It does not mean cancer was found.On the report
Hyperplastic, sessile serrated or traditional serrated: what is the difference?
These names describe polyps with different futures, even though they share a family and can look alike on the screen.
Hyperplastic polyp
The commonest serrated polyp and usually the least worrying. Small ones in the lower colon and rectum carry almost no cancer risk, and on their own they rarely change your follow-up.
Gets a closer look when
- It is a centimetre or larger
- It sits on the right side of the colon
- There are many of them
Sessile serrated lesion
A flat, precancerous polyp, mostly found on the right side. Older reports call it a sessile serrated adenoma or a sessile serrated polyp. All three names mean the same thing.
Removed whole, it is dealt with. The follow-up date is what changes.Serrated lesion with dysplasia
Dysplasia means some cells have started to look abnormal under the microscope. A sessile serrated lesion with dysplasia is further along the road, so it is followed more closely even when it came out completely.
Traditional serrated adenoma
Uncommon, usually raised rather than flat, and more often found on the left side. It is precancerous and is handled much like a sessile serrated lesion when your follow-up plan is made.
Not sure whether this applies to you?
Ask an oncologistAfter it is found
What happens after a serrated polyp is found at colonoscopy?
It is removed during the test
Most serrated polyps are removed there and then with a small wire loop. Large flat ones may first be lifted with an injection of fluid, and some come out in pieces. CION arranges the colonoscopy through an accredited partner hospital or diagnostic centre.
The laboratory reads the tissue
A pathologist names the polyp type and says whether dysplasia is present. The report follows separately, once the laboratory has finished. Our guide to a colon polyp biopsy result walks through the wording.
Two reports are read together
The colonoscopy report gives the number, size and position of each polyp, and how clean the bowel was. The pathology report gives the type. Your doctor needs both, because the plan depends on all of them.
A date for the next colonoscopy
Small hyperplastic polyps usually change nothing. Sessile serrated lesions bring the next test forward, and large ones, ones with dysplasia or ones removed in pieces bring it further forward. Our page on polyp surveillance intervals explains how that date is set.
Words on your report
What do the words on a serrated polyp report mean?
- Serrated
- A saw-tooth outline to the glands under the microscope. It names the family, not the level of risk.
- Sessile
- Flat or only slightly raised, with no stalk. Flat polyps are harder to see and harder to remove in one piece.
- SSL, SSA, SSA/P or SSP
- Different abbreviations for the same polyp. The name has changed over the years. The meaning has not.
- Dysplasia
- Cells that have started to look abnormal. It is a warning sign inside a polyp, and it is still not cancer.
- Proximal or right-sided
- The first part of the colon, near the appendix. Sessile serrated lesions are found here most often.
- Piecemeal removal
- The polyp came out in several pieces. A check of that spot at the next colonoscopy is then usually advised.
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Commonly believed
Four things people assume about serrated polyps, and what is true
"Hyperplastic and serrated are both harmless words."
Every hyperplastic polyp is serrated, but many serrated polyps are not hyperplastic. A small hyperplastic polyp is usually harmless. A sessile serrated lesion is precancerous and changes your follow-up, so the exact word on your report matters.
"It has been removed, so I never need another colonoscopy."
Removal deals with that polyp. Anyone who grew one is more likely to grow another, and flat lesions taken out in pieces can regrow at the same spot. The follow-up test is how both are caught early.
"My last colonoscopy was clear, so nothing was missed."
Flat serrated lesions can hide under mucus or leftover stool, especially on the right side. If your report says the bowel preparation was poor, ask whether the test should be repeated sooner.
"Serrated polyps mean cancer runs in my family."
Most people with one or two serrated polyps have no inherited condition. Age, smoking and excess weight are linked to them, along with plain chance, and nobody is to blame for growing one. Only an unusually large number raises the question of a syndrome.
Being straight with you
What this page cannot tell you
It cannot give you your own date for the next colonoscopy. That depends on how many polyps were found, their size and type, whether each came out whole and how clean the bowel was. Two people with the same polyp name can be given different dates, and both can be right.
It cannot settle a disputed label
Telling a large hyperplastic polyp from a sessile serrated lesion is one of the harder calls in bowel pathology. If your report sounds unsure, or two reports disagree, a second look at the slides can help. Asking for one is a fair request.
Who this does not apply to
This page is about one or a few serrated polyps found at an ordinary colonoscopy. It does not cover people with many serrated polyps, which raises the question of polyposis, or people with long-standing colitis, whose checks follow separate rules. If cancer was found inside the polyp, read our page on cancer found in a removed polyp instead.
If you have a report and are not sure what it means, call the helpline. A CION oncologist can go through it with you.Questions we are asked
Common questions about serrated and hyperplastic polyps
Is a sessile serrated polyp cancer?
No. It is a precancerous polyp, which means it could slowly become cancer if it were left in place for many years. Once it has been removed whole, the risk from that polyp is gone. The finding mainly means your next colonoscopy comes sooner than it otherwise would.
Should I worry about a hyperplastic polyp?
Usually not. Small hyperplastic polyps in the lower colon and rectum are among the most harmless findings a colonoscopy produces. Large ones, ones on the right side, or many of them get a closer look, because they can resemble sessile serrated lesions.
Why does one report say adenoma and another say lesion?
They are the same polyp. Pathologists have renamed it more than once, so older reports say sessile serrated adenoma or polyp and newer ones say lesion. The abbreviations SSA, SSP and SSL all refer to it. The risk and the follow-up are the same whichever name is used.
How soon will I need my next colonoscopy?
That depends on how many serrated polyps you had, how large they were, whether any showed dysplasia and whether they came out whole. A few small hyperplastic polyps may change nothing. Sessile serrated lesions bring the date forward. Your doctor sets it from both reports together.
Why are serrated polyps easy to miss?
They are often flat, pale and covered in a thin layer of mucus, so they blend into the normal lining. They also favour the right side of the colon, where leftover stool is common. A thorough bowel preparation and an unhurried look are the two things that help most.
Does my family need screening because of my polyp?
One or two serrated polyps do not usually change your relatives' screening on their own. Their plan depends on their own age and family history. If you had many serrated polyps, or very large ones at a young age, ask your doctor whether a family assessment is needed.
Can I lower my chance of getting more of them?
Not smoking is the clearest step, since smoking is linked to serrated polyps. A healthy weight, regular activity and plenty of fibre from dal, vegetables and millets support bowel health generally. None of these replaces the follow-up colonoscopy your doctor advises.
Can CION review my colonoscopy and pathology reports?
Yes. A CION oncologist can go through both reports with you, explain what the polyp names mean and say what follow-up makes sense. If another colonoscopy is needed, CION arranges it through a partner hospital or diagnostic centre. One helpline serves every CION centre.
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Sources
- NHS — Bowel polyps
- NIDDK (NIH) — Colon Polyps
- National Cancer Institute — Screening Tests to Detect Colorectal Cancer and Polyps
- National Cancer Institute — Surgical Pathology Reports
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
Polyp surveillance intervals explainedHow your polyp type turns into a date for the next colonoscopyTypes of colon polypWhere serrated polyps sit among every polyp type on a reportToo many polyps: when polyposis is suspectedWhat it means if many serrated polyps were foundSerrated polyposis explainedThe rare syndrome behind very large numbers of serrated polyps
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