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Endometrial Polyp or Cancer — How They Are Told Apart
Being told a scan has found “something in the cavity” is enough to keep anyone awake, so the proportions go first. Endometrial polyps are common, they are a frequent cause of abnormal bleeding, and the overwhelming majority are entirely benign. Most women told they have one are told the right thing. What is also true, and the reason polyps are removed rather than watched, is that a small minority contain hyperplasia or cancer — and no scan can tell which is which. The tissue has to be looked at. That is the whole of the answer to how they are distinguished.
- Polyps are common and usually benign — a frequent and treatable cause of abnormal bleeding
- No scan can tell for certain — imaging suggests; only examining the tissue settles it
- Which is why they are removed and examined — the procedure is both the treatment and the test
- Some features raise the odds — postmenopausal, bleeding, larger, or with risk factors
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What a Polyp Actually Is
An endometrial polyp is a localised overgrowth of the lining that projects into the cavity, usually on a stalk — a small tag of tissue rather than a lump within the wall of the uterus.
They are common, become more so with age, and behave in a characteristic way:
- They bleed unpredictably. A polyp has its own fragile blood supply and does not participate in the organised monthly shed, so it produces spotting between periods, bleeding after intercourse, or bleeding after the menopause. This is usually how they are found.
- They are often symptomless. A large proportion are discovered incidentally on a scan done for something else entirely, in a woman with no bleeding at all — and that situation is managed differently from a polyp found because of bleeding.
- They can inflate the thickness measurement. A polyp makes the lining measure thicker than it is, which is one reason a thickened endometrium on a scan does not mean what people assume. See endometrial thickness.
- They are not fibroids. Fibroids are muscular growths in the wall of the uterus. Polyps arise from the lining. Different tissue, different behaviour, different management — though a fibroid bulging into the cavity can look similar on a scan.
Did You Know? The reason a polyp is removed with a hysteroscope rather than scraped out blindly is worth knowing, because the two are not equivalent. A polyp sits on a stalk and moves when instruments pass, so blind curettage frequently misses it altogether or removes only part of it — and a partially removed polyp produces a specimen that may not represent the whole thing, while leaving tissue behind that continues to bleed. Removing it under direct vision allows the polyp to be taken at its base and retrieved intact. The point is not surgical elegance: it is that the pathologist receives the entire polyp, so the answer applies to all of it. Sources: RCOG / BSGE guidance on the management of endometrial polyps and on outpatient hysteroscopy; NCCN Clinical Practice Guidelines in Oncology — Uterine Neoplasms; ESGO–ESTRO–ESP guidelines for the management of patients with endometrial carcinoma.
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Which Features Raise the Odds
None of these means a polyp is cancerous. They shift the probability, and they influence how firmly removal is recommended.
| Feature | Why it matters |
|---|---|
| You are postmenopausal | The single most important factor. The proportion of polyps containing hyperplasia or cancer is meaningfully higher after the menopause than before it, which is why removal is recommended more consistently in this group. |
| The polyp caused bleeding | A polyp found because of bleeding carries a higher likelihood of significant pathology than one found incidentally in a woman with no symptoms. Symptomatic and incidental polyps are genuinely different situations. |
| It is large | Larger polyps are more likely to harbour hyperplasia or carcinoma than small ones. Size alone is not decisive but it contributes to the decision. |
| You have endometrial risk factors | Obesity, diabetes, or long-standing unopposed oestrogen exposure raise the background likelihood of abnormal lining tissue anywhere, including within a polyp. See obesity and endometrial cancer. |
| You take hormonal breast cancer treatment | Some hormonal treatments used after breast cancer act on the uterine lining and are associated with a higher rate of polyps, and of polyps containing abnormal tissue. See the breast cancer link. |
| It looks unusual on hysteroscopy | An irregular surface, atypical blood vessels or a broad base rather than a narrow stalk all prompt closer attention — though appearance still does not substitute for examining the tissue. |
The point of the whole table: these features change how strongly removal is advised, not whether the answer can be known without it. Even a polyp with none of these features cannot be declared benign on a scan. Removal is what converts a probability into an answer.
Told You Have a Polyp and Left Waiting?
Removal and examination usually settle it in one procedure — and often resolve the bleeding at the same time.
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Removing It Is Both the Test and the Treatment
It answers the question definitively, and it usually stops the bleeding that led to the scan.
How They Are Actually Told Apart
Three stages, and only the last of them is definitive.
- Ultrasound suggests. A transvaginal scan may show a focal mass within the cavity, sometimes with a visible feeding vessel. Saline infusion sonography — fluid instilled into the cavity during the scan — outlines a polyp more clearly. This tells you something is there and roughly what shape it is.
- Hysteroscopy sees. A telescope passed through the cervix shows the polyp directly: its size, its base, its surface, the pattern of its vessels. An experienced eye can form a strong impression at this point — and a strong impression is still not a diagnosis. See hysteroscopy and D&C.
- Pathology decides. The removed polyp is examined under a microscope. This is the only step that distinguishes a benign polyp, a polyp containing hyperplasia, and a polyp containing carcinoma. Everything before it is a probability.
- And the surrounding lining is assessed too. A biopsy of the endometrium around the polyp is usually taken at the same time, because a polyp can coexist with an abnormality in the rest of the lining — and finding one does not exclude the other.
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What Each Possible Result Means
Four outcomes, in descending order of how often they occur.
A benign polyp
By far the commonest result. The polyp was exactly what it appeared to be, it has been removed, and in most women the bleeding that led to the investigation resolves. No further treatment is needed, though polyps can recur and new bleeding in future should be reported rather than assumed to be another harmless one.
A polyp containing hyperplasia without atypia
The polyp contained an overgrown but not precancerous lining. Not cancer, and generally managed with progestin treatment and repeat sampling to confirm the rest of the lining has cleared — because hyperplasia inside a polyp raises the question of what the surrounding endometrium is doing. See endometrial hyperplasia.
A polyp containing atypical hyperplasia
Uncommon, and it changes the situation materially. Atypical hyperplasia is a recognised precancer wherever it is found, and it prompts the same conversation as atypia found anywhere in the lining — including whether hysterectomy is advised. See atypical hyperplasia.
A polyp containing carcinoma
The least common outcome, and when it happens it is usually found early — the polyp bled, the woman reported it, and it was investigated. Staging and treatment then follow the usual pathway, and cancers found this way are frequently confined to the uterus. See stage 1 endometrial cancer.
What If It Was Found by Accident?
A polyp discovered on a scan done for something else, in a woman with no bleeding at all, is a genuinely different situation from one found because of symptoms — and it is worth knowing that, because the advice you receive may reasonably differ from what this page implies elsewhere.
- The likelihood of significant pathology is lower. Symptomless polyps in premenopausal women are the group least likely to contain anything abnormal, and observation is a defensible option in some cases.
- Menopausal status is the main determinant. After the menopause, removal is recommended much more consistently, even without bleeding, because the odds shift.
- Small polyps sometimes resolve on their own. Particularly in premenopausal women. This is a recognised phenomenon and part of why watchful waiting is sometimes reasonable.
- Removal is also considered for fertility reasons. Polyps can interfere with implantation, so a woman trying to conceive may be advised to have one removed on those grounds regardless of the cancer question.
If you have been offered observation rather than removal for an incidental polyp, that is not necessarily under-treatment — but it is worth asking directly what the plan is if it grows, if bleeding starts, or if you pass the menopause in the meantime.
Why Removal Under Vision Matters
A blindly scraped polyp gives a partial specimen and leaves tissue behind. Taken under vision, the pathologist gets all of it.
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Common questions
Endometrial Polyp vs Cancer — Frequently Asked Questions
Are endometrial polyps usually cancerous?
No — the overwhelming majority are entirely benign, and most women told they have a polyp are told the right thing. Polyps are common, become more frequent with age, and are a well-recognised cause of abnormal bleeding. A small minority, however, contain endometrial hyperplasia or carcinoma, and that minority is larger in postmenopausal women, in women whose polyp was found because of bleeding rather than incidentally, in larger polyps, and in women with risk factors such as obesity or hormonal breast cancer treatment. Because no scan can distinguish which is which, removal and examination of the tissue is how the question is settled.
Can a scan tell whether a polyp is cancerous?
No, and this is the central point. Ultrasound can show that a focal mass is present in the cavity, and saline infusion sonography outlines it more clearly. Hysteroscopy goes further, showing the polyp directly — its size, its base, its surface, the pattern of its blood vessels — and an experienced gynaecologist can form a strong impression from that appearance. But a strong impression is not a diagnosis. Only histological examination of the removed tissue distinguishes a benign polyp from one containing hyperplasia or carcinoma. This is why removal is both the treatment and the definitive test.
Why is the polyp removed with a hysteroscope rather than scraped out?
Because a polyp sits on a stalk and moves when instruments pass, so blind curettage frequently misses it altogether or removes only part of it. That matters for two reasons. A partially removed polyp yields a specimen that may not represent the whole thing, so the pathologist's answer applies only to the fragment that arrived. And tissue left behind continues to bleed, so the symptom that prompted the investigation persists. Removing the polyp under direct vision allows it to be excised at its base and retrieved intact, which means the result covers the entire polyp and the bleeding is more likely to resolve.
My polyp was found by accident and I have no symptoms. Does it still need removing?
Possibly not, and this is a genuinely different situation from a polyp found because of bleeding. Symptomless polyps in premenopausal women are the group least likely to contain significant pathology, small ones sometimes resolve spontaneously, and observation is a defensible option. After the menopause the calculation shifts and removal is recommended much more consistently, even without bleeding, because the likelihood of abnormal tissue is higher. Removal may also be advised for fertility reasons, since polyps can interfere with implantation. If observation has been offered, ask what the plan would be if it grows, if bleeding starts, or once you pass the menopause.
If the polyp is benign, is that the end of it?
Usually, and with two caveats worth knowing. First, a biopsy of the lining around the polyp is normally taken at the same time, because a polyp can coexist with an abnormality elsewhere in the endometrium — finding one does not exclude the other, and it is the surrounding lining result that completes the picture. Second, polyps can recur, and new bleeding in future should be reported and investigated rather than assumed to be another harmless polyp. Beyond that, a benign result means the polyp was exactly what it appeared to be, it has been removed, and in most women the bleeding that led to the investigation settles.
Medical disclaimer: This page explains how endometrial polyps are distinguished from cancer and is reviewed by a CION oncologist, following RCOG/BSGE guidance on the management of endometrial polyps and current NCCN guidance. The great majority of endometrial polyps are benign. It is general health information rather than advice about your own case, and decisions about whether a particular polyp should be removed or observed should be made with the clinician who has seen your imaging.