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Treatment Explained · Reviewed by CION Oncologists · NABH Accredited
Vaginal Vault Brachytherapy — What It Is Really Like
If you have had surgery for endometrial cancer and been offered brachytherapy, the word alone is enough to worry anyone. What it actually means is a small number of outpatient appointments in which a smooth plastic applicator, not unlike a large tampon, is placed in the vagina and a radiation source is passed through it for a few minutes. No anaesthetic, no admission, and you drive home afterwards. It is aimed at the top of the vagina because that is where endometrial cancer comes back if it comes back locally — and it treats that spot while largely leaving the bowel and bladder alone.
- A few outpatient sessions — typically a handful of appointments over one to two weeks
- No anaesthetic, no admission — the treatment itself takes minutes, and you go home the same day
- Far gentler than pelvic radiation — the dose falls away sharply, so the bowel is largely spared
- The dilator part matters — not optional, and the thing most often left out of the explanation
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What It Is, and Why That Particular Spot
After a hysterectomy, the top of the vagina is closed with stitches where the cervix used to be. That closed end is the vaginal vault. It is the junction between what was removed and what remains — and it is the commonest place for endometrial cancer to reappear locally.
Brachytherapy means treating from inside rather than from outside. A cylindrical applicator is placed in the vagina, and a radioactive source travels through it under computer control, pausing at calculated positions. Because the source sits directly against the tissue being treated, two things follow:
- The vault gets a high dose. Enough to sterilise microscopic disease that might have been left behind, delivered exactly where the risk is.
- Everything nearby gets very little. Radiation dose falls away steeply with distance. A centimetre or two from the applicator, the dose is a fraction of what the surface receives — which is why the bowel is largely spared.
- Nothing stays inside you. The source is retracted into a shielded machine at the end of each treatment. You are not radioactive afterwards, you are not a risk to children or grandchildren, and there are no restrictions on contact. This is the single most common worry, and it is unfounded.
This is quite different from radiation to the whole pelvis, which treats a large volume including the lymph node areas over several weeks. See pelvic radiation for when that is needed instead, and the adjuvant decision for how the choice is made.
Did You Know? Vault brachytherapy exists because of a specific observation: when early endometrial cancer recurs after surgery, it recurs at the vaginal vault far more often than anywhere else. That made it possible to ask whether treating just that small area worked as well as irradiating the whole pelvis. A randomised trial in women with intermediate-risk endometrial cancer answered it — vault brachytherapy was as effective as external beam pelvic radiotherapy at preventing vaginal recurrence, with significantly less bowel toxicity and better reported quality of life. That single result is why most women in this situation are now offered the short internal course rather than several weeks of pelvic treatment. Sources: PORTEC-2 randomised trial of vaginal brachytherapy versus external beam pelvic radiotherapy in endometrial carcinoma; NCCN Clinical Practice Guidelines in Oncology — Uterine Neoplasms; ESGO–ESTRO–ESP guidelines for the management of patients with endometrial carcinoma.
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Vault Brachytherapy Compared With Pelvic Radiation
These are frequently confused, and the difference in what they ask of you is substantial.
| Vault brachytherapy | External beam pelvic radiation | |
|---|---|---|
| What is treated | The vaginal vault and upper vagina only — a small, defined area. | The whole pelvis, including the lymph node regions and the tissues around the vault. |
| How long | A small number of sessions, usually over one to two weeks. | Daily treatment on weekdays for around five weeks. |
| Each appointment | Around 30–60 minutes in the department; the radiation itself takes minutes. | A short daily appointment, but every weekday for weeks — the cumulative burden is the issue. |
| Bowel effects | Minimal. The bowel sits outside the treated volume. | Common during treatment, and a proportion of women have lasting changes in bowel habit. |
| Vaginal effects | Dryness and narrowing are the main issues, and both are manageable with dilator use. | The same vaginal effects, generally over a larger length of the vagina. |
| Lymphoedema risk | Not increased by the brachytherapy itself. | Added risk, particularly if lymph nodes were also removed at surgery. |
| Typically offered to | Intermediate-risk disease confined to the uterus — the largest group needing anything after surgery. | Higher-risk disease: cervical stromal involvement, substantial vessel invasion, node involvement. |
If you are being offered pelvic radiation and wondering whether brachytherapy alone would do, that is a legitimate question and one with a real evidence base behind it for the intermediate-risk group. It is not the right answer for everyone — higher-risk features genuinely change the calculation — but where your case sits near the boundary, ask which risk features are driving the recommendation.
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A Short Course That Protects the One Spot That Matters
Delivered on site, by a radiation oncologist who will tell you honestly whether you need it.
The part nobody describes
What Each Session Is Actually Like
Most information about this treatment stops at “an applicator is inserted”. Women want to know what that means in practice, and the honest detail is less alarming than the imagination.
Before you start: planning
There is a planning appointment before treatment begins. The applicator is selected — they come in different diameters, and choosing one that fits comfortably matters for both comfort and dose accuracy. A scan is done with the applicator in place so the radiation oncologist and physicist can calculate exactly where the source should pause and for how long, given the length of vagina being treated and where the bladder and rectum sit. This is also the appointment to say if anything is uncomfortable, because adjustments are much easier now than later.
Arriving, and the wait
Come with an empty bowel where possible and follow whatever bladder instruction you are given — some units ask for a comfortably full bladder to push the bowel out of the way. You change into a gown. The whole appointment usually runs 30 to 60 minutes, of which the radiation is a few minutes; most of it is positioning, checking and calculation. Bring something to read. Many women find the routine becomes unremarkable by the second session.
The applicator
You lie on your back with your knees bent, as for a smear test. The applicator is a smooth cylinder, lubricated, and is placed in the vagina and gently held in position. For most women it is comparable to a vaginal examination — pressure rather than pain. It can be uncomfortable if the tissues are dry or if healing from surgery is recent, and that is worth saying out loud rather than enduring: a smaller applicator, more lubricant, or simple pain relief beforehand usually resolves it. Its position is checked with imaging before treatment is given.
The treatment itself
The staff connect the applicator to the machine and leave the room, watching and speaking to you over an intercom and camera. The source travels down a fine tube into the applicator, pauses at the calculated positions, and retracts. It takes a few minutes. You feel nothing at all — no heat, no tingling, no sensation of any kind. When it finishes, staff return, disconnect the applicator and remove it. You dress and go home, and can drive yourself.
Afterwards, and between sessions
Most women feel entirely normal and go back to work. Some notice mild vaginal soreness, a little discharge, or slight urinary frequency, building gradually across the course. It settles over the weeks after treatment ends. Fatigue, if it occurs at all, is far milder than with pelvic radiation because so little tissue is being irradiated. There are no restrictions on being around other people, and that includes children and pregnant women, because nothing radioactive remains in your body between sessions.
The dilator conversation — the important one
Radiation causes the vaginal tissue to lose elasticity as it heals, and the vagina can shorten and narrow. Regular dilator use keeps it open, and it is not optional advice. It matters for two reasons: comfortable intercourse if you want it, and — the reason that gets omitted — so the vault can be examined at follow-up. A vagina that has narrowed shut cannot be inspected, and the vault is exactly where recurrence would appear first. If nobody has given you a dilator and shown you how to use it, ask. See vaginal health after treatment.
Side Effects, and What Helps
Vault brachytherapy is among the better-tolerated cancer treatments. These are the effects that do occur, and none of them is something to simply put up with.
Common, short-term
Vaginal Soreness and Discharge
Builds during the course and settles over the following weeks. Simple pain relief and avoiding anything irritating is usually enough. Report anything heavy or offensive-smelling.
Common, long-term
Vaginal Dryness
Often persistent, and worse if the ovaries were removed. Moisturisers and lubricants help considerably. Local oestrogen is sometimes appropriate — a conversation to have with your oncologist.
Common, preventable
Narrowing and Shortening
The main long-term effect, and the one that regular dilator use genuinely prevents. Starting early and continuing long term is what works; starting late works far less well.
Occasional
Urinary Irritation
Mild frequency or stinging during and shortly after the course. Usually settles. Worth ruling out infection rather than assuming it is the radiation.
Uncommon
Bowel Symptoms
Much less common than with pelvic radiation, because the bowel sits outside the treated volume. If bowel symptoms are significant, they deserve investigation rather than attribution.
Always worth raising
Effects on Intimacy
Dryness, discomfort and anxiety about sex after cancer treatment are common and treatable. They are a clinical topic, not a private one. See intimacy after treatment.
Offered Radiation and Want a Second View?
Whether you need it, and whether brachytherapy alone would do instead of pelvic radiation. Both are fair questions. The opinion is free.
Do You Actually Need It?
This deserves its own section, because a page describing a treatment tends to imply you should have it, and for a large group of women the correct answer is no.
After surgery for endometrial cancer, the tumour board weighs stage, grade, depth of invasion into the muscle wall, lymphovascular invasion, histological type and molecular group, and sorts the case into a risk category. From there:
- Low risk — usually nothing. A Grade 1 or 2 endometrioid tumour with shallow invasion and no substantial vessel involvement generally needs no radiation at all. Treating everybody in this group would expose many women to side effects to benefit very few.
- Intermediate risk — vault brachytherapy. This is the group the treatment was designed for and where the randomised evidence sits. A short course targeted at the vault, rather than several weeks of pelvic treatment.
- High risk — pelvic radiation, often with a vault boost. Where cervical stromal involvement, substantial vessel invasion or node involvement is present, treating the wider pelvis is usually recommended. See stage 2 and stage 3.
- Molecular group can move you. A POLE-mutated tumour behaves favourably even at high grade and may warrant less treatment than the grade alone would suggest. See molecular testing.
Where the absolute benefit is a few percentage points, your own view of that trade-off is a legitimate part of the decision. A good oncologist will give you the numbers rather than the conclusion.
Why Having Brachytherapy On Site Matters
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Common questions
Vaginal Vault Brachytherapy — Frequently Asked Questions
Does vaginal vault brachytherapy hurt?
The radiation itself produces no sensation at all — no heat, no tingling, nothing. What women feel is the applicator, and for most that is comparable to a vaginal examination or a smear test: pressure rather than pain. It can be uncomfortable if the tissues are dry, or if you are still healing from surgery. That is worth saying rather than enduring, because there are straightforward fixes — a smaller-diameter applicator, more lubricant, or simple pain relief taken before the appointment. No anaesthetic is needed, and you can drive yourself home afterwards. If any session is genuinely painful, tell the team before the next one.
Will I be radioactive afterwards?
No. This is the most common worry about brachytherapy and it is entirely unfounded for the way this treatment is given. The radioactive source travels into the applicator from a shielded machine, stays for a few minutes, and is retracted back into the machine before the applicator is removed. Nothing remains inside you between sessions or after the course finishes. You are not a hazard to anyone, there are no restrictions on contact, and you can hug your grandchildren, share a bed and sit next to a pregnant woman on the same day as treatment. The staff leave the room during treatment because they would otherwise receive small doses many times a day, every day.
How many sessions will I need?
A small number — typically a handful of appointments spread over one to two weeks, though the exact number and the dose per session vary between units and depend on whether brachytherapy is being given alone or as a boost after pelvic radiation. Each appointment takes roughly 30 to 60 minutes in the department, of which the radiation itself is only a few minutes; most of the time is positioning, imaging to confirm the applicator is correctly placed, and dose calculation. Compared with external beam pelvic radiation, which means daily treatment on weekdays for around five weeks, the burden is very much smaller.
Why do I need to use a vaginal dilator?
Because radiation makes vaginal tissue lose elasticity as it heals, and without regular stretching the vagina can shorten and narrow — sometimes considerably. Regular dilator use prevents that, and it matters for two reasons. The obvious one is being able to have comfortable intercourse if you want to. The one that is often left out is that your follow-up appointments involve examining the vaginal vault, because that is exactly where a recurrence would appear first. A vagina that has narrowed shut cannot be examined properly. Starting early, once healing allows, and continuing long term is what works; starting months later works far less well.
Is brachytherapy as good as full pelvic radiation?
For the right group of women, yes — and this has been tested directly rather than assumed. A randomised trial in women with intermediate-risk endometrial cancer compared vaginal brachytherapy with external beam pelvic radiotherapy and found brachytherapy equally effective at preventing recurrence at the vaginal vault, with significantly less bowel toxicity and better reported quality of life. That is why it is now standard for that group. It is not equivalent for everyone: where there is cervical stromal involvement, substantial lymphovascular invasion, or lymph node involvement, the wider pelvis carries meaningful risk and treating only the vault would leave that untreated.
Medical disclaimer: This page describes vaginal vault brachytherapy in general terms and is reviewed by a CION radiation oncologist, following current NCCN and ESGO–ESTRO–ESP guidance. The number of sessions, dose and applicator used vary between units and between women. It is not advice about your own treatment. Whether radiation is needed after surgery at all is a decision made on your final pathology by the oncology team treating you.