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Borderline & premalignant

Borderline Ovarian Tumour: — What the Diagnosis Means

A borderline ovarian tumour is not a benign cyst and it is not invasive cancer. It is a recognised middle category in pathology, and the distinction matters for how it is treated.

Medically reviewed by Dr. C. Raghavendra Reddy, Medical Oncologist, MBBS (Gold Medal) · DNB · DM (Medical Oncology, Gold Medal) · Last reviewed September 2026

  • Not invasive cancer — Borderline tumours have abnormal cells but have not broken through into the surrounding tissue.
  • Not benign either — Unlike a simple cyst, a borderline tumour needs surgical treatment and long-term follow-up.
  • Surgery is the treatment — Chemotherapy is not routinely used. Surgery to remove the tumour is the standard approach.
  • Ask about fertility before surgery — For younger patients with one ovary affected, a more limited operation may be possible. Raise it before the operation is planned.
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A borderline ovarian tumour sits between a benign cyst and invasive cancer. The cells are abnormal, but they have not invaded the surrounding tissue — that absence of invasion is the defining feature. Surgery is the standard treatment. Your oncologist will explain what your specific pathology report means for your management.

What the words in your pathology report mean

Borderline tumour
A growth with abnormal cells that has not invaded the surrounding tissue layer. It is a genuine middle category — neither a benign cyst nor an invasive cancer. The distinction is made by examining the removed tissue under a microscope.
Low malignant potential (LMP)
The other name for the same diagnosis. Both terms appear in pathology reports and clinical guidelines. They mean the same thing.
Stromal invasion
The feature borderline tumours do not show. Invasive cancer breaks through into the stromal layer beneath the surface cells. Borderline tumours stay within the surface layer — that absence of invasion is what places them in their own category.
Stage
A description of where the tumour was found at surgery. Most borderline ovarian tumours are found at stage I, meaning confined to the ovary. Stage guides decisions about further treatment and follow-up.

Is a borderline ovarian tumour actually cancer?

It is not invasive cancer. The cells look abnormal under a microscope, but they have not invaded the ovarian stroma — the tissue layer beneath the surface. That absence of stromal invasion is the line pathologists draw between borderline and malignant.

It is also not benign. Unlike a simple cyst, a borderline tumour requires surgical treatment and long-term follow-up. The word 'borderline' reflects a genuine biological category, not an uncertain or incomplete diagnosis.

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What treatment does a borderline ovarian tumour need?

Surgery is the standard treatment. For most patients this means removing the affected ovary and fallopian tube, along with a staging procedure to confirm how far the tumour has spread. Chemotherapy is not routinely recommended after surgery for borderline histology — this is consistent with ESMO and NCCN guidance.

If preserving fertility matters to you, raise it before surgery is planned. For some patients with one ovary affected, a more limited operation may be an option. Your surgeon will explain whether this applies in your case and what it means for follow-up.

Questions about your diagnosis and what comes next

Does borderline mean it will eventually turn into cancer?

A borderline tumour is not a pre-cancer in the way that a bowel polyp precedes bowel cancer. After complete surgical removal, most borderline tumours do not progress to invasive disease. When recurrence does happen, it most often presents as another borderline tumour rather than as invasive cancer. The risk depends on the tumour type, the stage at diagnosis, and whether a fertility-preserving operation was performed. Your oncologist will discuss your individual situation based on your pathology and staging results.

What follow-up will I need after surgery?

Long-term follow-up is recommended because borderline tumours can recur years after surgery, even when the operation appeared complete. This typically involves periodic pelvic examination and ultrasound, and sometimes a tumour marker such as CA-125 depending on the tumour type. The schedule is decided by your oncologist based on your stage, tumour type, and surgical approach. Patients who had a fertility-preserving operation are generally followed more closely. Ask your oncologist at your next appointment what your specific plan includes.

Can I still have children after this diagnosis?

For many patients with a borderline tumour affecting only one ovary, fertility-preserving surgery — removing the affected ovary while keeping the other ovary and the uterus — is a recognised option discussed in ESMO and NCCN guidance. It is associated with a small risk that the tumour could recur in the remaining ovary, which is why more frequent follow-up is recommended. The decision depends on your age, fertility priorities, the tumour type, and the surgical findings. Raise this before your operation is planned.

Is a second opinion on the pathology worthwhile?

It is a reasonable request, particularly for a diagnosis in an intermediate category. The distinction between borderline and invasive disease is made by examining the removed tissue under a microscope, and it requires expertise in gynaecological pathology. If there is any uncertainty about the diagnosis, or the terminology has not been fully explained, ask your oncologist to arrange a review by a specialist gynaecological pathologist. This is a routine request and does not imply any criticism of your treating team.

Did you know?

A borderline ovarian tumour cannot be diagnosed from imaging alone. CT and MRI can identify an unusual ovarian mass, but the diagnosis requires laboratory examination of the tissue removed at surgery. The final pathology result sometimes differs from what imaging suggested — which is why the surgical specimen is the definitive step.

Source: ESMO Guidelines: Ovarian Cancer, Fallopian Tube Cancer and Primary Peritoneal Cancer

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Common questions

Frequently asked questions

What exactly is a borderline ovarian tumour?

A borderline ovarian tumour has abnormal cells that have not invaded the surrounding tissue. That absence of invasion — called stromal invasion — is what separates it from ovarian cancer. It is also called a low malignant potential tumour. Both names describe the same recognised pathological category, distinct from both benign ovarian cysts and invasive cancer.

Is a borderline tumour the same as stage 0 cancer?

No. Stage describes where in the body a tumour has spread. Borderline refers to the biology of the cells — whether they are invasive or not. These are two separate pieces of information on a pathology report. A borderline tumour can be found at different stages. Your oncologist will explain both your stage and your tumour type and what each means for your management.

Do I need chemotherapy for a borderline ovarian tumour?

Chemotherapy is not routinely recommended after surgery for borderline histology. ESMO and NCCN guidelines do not include it as standard treatment for this diagnosis. Surgery to remove the tumour is the primary treatment. Whether any additional treatment applies in your case is a question your oncologist will answer based on your stage, tumour type, and what was found at surgery.

Will I need both ovaries removed?

That depends on your age, fertility priorities, and which ovaries were involved. Removal of both ovaries and fallopian tubes is the complete surgical option. For younger patients with one ovary affected, a more limited fertility-preserving operation is sometimes possible. This needs to be discussed with your surgeon before the operation, because the surgical approach affects both the procedure and the follow-up plan.

How long does follow-up go on for?

ESMO guidance recommends long-term follow-up because recurrence can happen years after surgery. There is no single standard duration — the schedule depends on your stage, tumour type, and whether you had fertility-preserving surgery. Patients who kept their remaining ovary are generally followed more frequently. Ask your oncologist at your next appointment what your plan includes and when it would be reviewed.

Should I get a second opinion?

It is always reasonable to request one, particularly for a diagnosis in an intermediate category. A second opinion from a gynaecological oncologist, or a review of your tissue slides by a specialist gynaecological pathologist, can provide additional confidence in the diagnosis and the management plan. Ask your oncologist to facilitate this — it is a routine request and does not reflect poorly on your treating team.

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