CION Ameerpet
Radiation Therapy · Skull Base & Hearing Nerve
Radiation for Acoustic Neuroma — Vestibular Schwannoma, Hearing and Balance
Medically reviewed by Dr. Gangadhar Vajrala, Radiation Oncologist, MBBS · MD (Radiation Oncology) · MPH · Last reviewed August 2026
An acoustic neuroma is not cancer. It is a benign, slow-growing tumour on the hearing and balance nerve, and you usually have three reasonable options: watch it with scans, treat it with radiosurgery, or remove it with surgery. Radiosurgery aims to stop it growing without an incision, and to protect the hearing and balance you still have.
- It is benign, so you have time — This tumour does not spread elsewhere in the body. Almost no one needs to decide today — take the second opinion first.
- Radiosurgery makes no cut — No incision, no skull opening, no general anaesthesia — usually one session, or a short course of a few sessions, and home the same day.
- Hearing you have is protected, not restored — Treatment is planned to keep the dose to the inner ear as low as possible. Hearing already lost does not come back with any option.
- Delivered at an NABH-accredited partner centre — CION Cancer Clinics does not own a radiosurgery unit. We coordinate your plan, your oncology team, your hearing tests and your follow-up throughout.
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The short answer
Surgery or radiosurgery for an acoustic neuroma?
Both are accepted options, and size usually decides. Small and medium tumours that are not pressing on the brainstem are often treated with radiosurgery, which needs no incision. Large tumours, or tumours causing pressure or fluid build-up, are usually removed surgically. A small, quiet tumour may simply be watched.
The word most patients miss on the report is benign. A vestibular schwannoma grows from the insulating sheath of the balance nerve. It is not a cancer, it does not spread to other parts of the body, and in most people it grows slowly or not at all. That single fact changes the decision: you are choosing between three reasonable paths, not racing one.
Because of that, the honest framework is not “which treatment is better”. It is “what is this tumour doing, what is my hearing doing, and what am I willing to trade”. International guidance from bodies such as NCCN and ASTRO treats observation, radiosurgery and microsurgery as legitimate choices for suitable tumours, and expects the decision to be made by a team that includes a neurosurgeon, an ENT surgeon and a radiation oncologist.
Your radiosurgery is delivered at an NABH-accredited partner centre; CION Cancer Clinics coordinates your treatment plan, your oncology team and your care throughout. CION does not own or operate a linear accelerator, CyberKnife or Gamma Knife unit and is not itself NABH-accredited.
The three paths, side by side
No column here is ranked above the others. Print these rows and ask your team which one fits your scan — and why.
| Factor | Watch and rescan | Radiosurgery / stereotactic radiotherapy | Microsurgical removal |
|---|---|---|---|
| Usually considered for | Small tumours, no or mild symptoms, older age or other health problems | Small to medium tumours not compressing the brainstem | Large tumours, brainstem pressure, fluid build-up, or when tissue diagnosis is needed |
| Is an incision made? | No | No — nothing enters the head | Yes — under general anaesthesia |
| Typical schedule | MRI every 6 to 12 months at first, then less often | One session, or three to five short sessions; sometimes a longer daily course | One operation plus an inpatient stay |
| Goal of the approach | Confirm whether it is actually growing before acting | Stop further growth; the tumour is not removed | Physically remove the tumour |
| Effect on hearing already lost | Not restored | Not restored | Not restored |
| Effect on remaining hearing | Often declines slowly anyway | Planned to keep inner-ear dose low; decline over years is still possible | Depends on the approach used; some approaches sacrifice hearing on that side |
| Balance in the first weeks | Unchanged | Usually little change; mild unsteadiness in some patients | Often intense vertigo at first, settling as the brain compensates |
| Return to routine | Immediate | Usually within a day or two | Weeks, set by the operation and recovery |
| Main trade-off | You live with an untreated tumour and repeat scans | The tumour stays in place and is followed on scans for years | An operation, an anaesthetic and a recovery period |
| Where it happens | Imaging, radiosurgery and surgery are all delivered at NABH-accredited partner centres; CION Cancer Clinics coordinates the plan, the team and the care | ||
| Cost pattern (indicative only, as of August 2026) | Cost of repeat scans and reviews | Usually priced per treatment course — ask for a written estimate | Operation plus inpatient stay — ask for a written estimate |
This table is a framework, not a recommendation. Tumour size, its position against the brainstem, your current hearing and your age all change how these rows read for you.
Did you know?
An acoustic neuroma is not a cancer. It grows from Schwann cells — the insulating sheath around the vestibular part of the eighth cranial nerve — which is why doctors call it a vestibular schwannoma. It does not spread to other organs. Many are now found by chance on an MRI ordered for something else, such as one-sided ringing or a headache, and a proportion of those never grow enough to need treatment at all. Current as of 2026.
The fear behind the appointment
Will my hearing be preserved?
Radiosurgery aims to protect the hearing you still have. It does not bring back hearing you have already lost, and no team can promise that hearing will stay unchanged. That is true of surgery and of watching the tumour as well. Being told this plainly is more useful than a reassurance nobody can honour.
Here is the part that is rarely explained. By the time an acoustic neuroma is found, the hearing nerve has usually been under pressure for years. Hearing on that side often continues to slip gradually afterwards, even in people whose tumour never grows again. So a change in hearing after treatment is not automatically caused by the treatment.
What your team can influence is dose. The cochlea — the hearing organ in the inner ear — sits millimetres from the target. Modern planning shapes the dose to keep the cochlear dose as low as the tumour allows, and international practice has moved to lower marginal doses than were used decades ago precisely because that reduced cranial nerve injury.
Three things make a real difference to your own outcome, and you can ask for all three: a baseline audiogram before treatment, a written note of the planned dose to the cochlea, and repeat hearing tests at follow-up so any change is caught early rather than noticed a year later.
If hearing on the treated side does become unusable over time, that is not the end of the conversation. An ENT or audiology review can discuss hearing devices designed for single-sided hearing loss.
The question nobody asks out loud
What about my balance?
Most people are steadier after radiosurgery than they expect. The tumour grew slowly, so the brain has already learned to lean on the other ear, the eyes and the feet. Radiosurgery leaves the balance nerve in place, so that adjustment is not suddenly undone.
Surgery behaves differently. If the balance nerve is divided during removal, the brain loses that input in one moment. Vertigo is often intense for the first days and then settles over weeks as compensation rebuilds. Neither pattern is a complication; they are two different routes to the same endpoint.
After radiosurgery, some patients do notice a few weeks or months of mild unsteadiness, brief spinning on turning the head, or more difficulty walking in the dark. Vestibular rehabilitation — a short set of daily gaze and balance exercises taught by a physiotherapist — is the single most useful thing you can do, and it works better when you start early rather than waiting to see.
Practical measures matter as much as exercises: light at night on the route to the bathroom, no loose rugs, a hand on the rail on stairs, and no driving until you and your team agree that your balance and vision are reliable.
Sudden severe spinning with vomiting, a new severe headache, new facial weakness or a rapid change in walking are not part of normal recovery. Call your team or our helpline on 1800 202 8726 the same day.
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Ask what your own scan actually calls for
A radiation oncologist can go through the MRI, the audiogram and the three options with you — and tell you plainly whether this needs treating now at all. Free, confidential, no commitment.
Start to finish
What actually happens if you choose radiosurgery?
A typical pathway at an NABH-accredited partner centre. Single-session and few-session plans differ only at step 5.
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Confirming the diagnosis
A contrast MRI of the internal auditory canals shows the tumour, its size and how close it sits to the brainstem. A hearing test and a balance assessment record where you are starting from.
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The joint decision
A radiation oncologist, a neurosurgeon and an ENT surgeon review the same images together. You should leave that meeting knowing why one path was recommended over the other two.
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Immobilisation and planning scan
A custom mask, or on some platforms a lightweight frame, holds the head still to sub-millimetre accuracy. A planning scan is taken with it in place. Nothing is treated on this visit.
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Building the plan
A physicist and your radiation oncologist shape the dose around the tumour while pulling it away from the cochlea, the facial nerve, the trigeminal nerve and the brainstem. This takes days, not minutes.
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Treatment itself
You lie still while the machine delivers the beams. There is nothing to feel and no pain. A single session commonly runs under an hour; a few-session plan repeats this on consecutive days.
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Home the same day
Most people go home within hours and return to routine activity in a day or two. You are not radioactive and it is safe to be around children and pregnant family members.
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Follow-up scans and hearing tests
MRI is usually repeated at around six and twelve months, then at widening intervals for several years, alongside hearing tests. The result is read from the trend across scans, never from one.
Sight, honestly
Can radiation near the ear affect my eye or my vision?
The optic nerves sit well away from an acoustic neuroma, so vision loss is not an expected effect of treating one — though no team can guarantee any nerve outcome. The eye risk here is indirect, and it comes from the facial nerve rather than from the beam reaching the eye.
The facial nerve runs alongside the tumour. If it becomes weak, the eyelid on that side may not close completely. A blink that does not fully meet leaves the surface of the eye exposed and dry, and a dry cornea is what actually threatens sight in this situation — not the radiation dose itself.
That is why the follow-up plan should include your eye, not only your ear. Report new dryness, watering, redness, a gritty feeling, sensitivity to light or a blink that feels incomplete straight away. Lubricating eye care, protecting the eye at night and an eye specialist review are simple, effective and time-sensitive.
Facial numbness or tingling on the same side of the face can also occur, because the trigeminal nerve passes nearby. It is usually mild, and it should still be reported so your team can record it against your baseline.
Related reading: Radiation Near the Eye: Will I Lose My Vision? covers the situations where the eye itself is inside the treated area.
After the treatment day
What do the follow-up years look like?
Radiosurgery does not remove the tumour. It aims to stop it growing, and that result is read from a series of scans over years — which is why the follow-up plan matters as much as the treatment.
The scan that scares people
Early swelling is common
A temporary increase in size, often with a dark centre where contrast no longer takes up, is well recognised in the first six to eighteen months. It usually settles on its own.
Timescale
Months and years, not weeks
Do not judge the result from a six-week scan. Teams look for stability or gradual shrinkage across repeated scans, which is why the schedule stretches over years.
Tinnitus
Ringing rarely disappears
Neither radiosurgery nor surgery is aimed at tinnitus. It may stay the same or fluctuate. Sound therapy and habituation strategies from an audiologist help more than waiting.
Facial nerve
Weakness is uncommon now
Lower marginal doses in current practice have reduced facial nerve injury compared with the doses used decades ago. Any new weakness must be reported the day you notice it.
Rare but urgent
Fluid build-up in the brain
Uncommon, and more likely with larger tumours. Persistent headache, vomiting, blurred vision or a change in walking needs same-day assessment, not a wait-and-see.
Long-term risk
A new tumour is very rare
A radiation-related second tumour is a recognised but very rare long-term risk, and one reason younger patients discuss all three options carefully. Ask your team how it applies at your age.
Bring these to your consult
Seven questions to ask before you agree to anything
Each one turns a frightening diagnosis into a plan you can actually prepare for.
- How big is it, and is it touching the brainstem? — this single answer drives most of the decision between the three paths.
- Do we have proof it is growing, or only one scan? — a second scan a few months later sometimes replaces treatment altogether.
- What is my hearing now, in numbers? — ask for the audiogram before treatment so later changes can be measured, not guessed.
- What dose will reach my cochlea and my facial nerve? — a good team will show you this from the plan.
- Single session or a few sessions, and why for me? — there should be a reason specific to your tumour.
- What is the follow-up scan schedule, and what would count as a good result? — so an early swelling scan does not frighten you unnecessarily.
- What is the indicative cost, and is it covered by my insurance or scheme? — get it in writing before you decide.
Prefer to ask these out loud? Call 1800 202 8726 and we will book you a free consultation with a radiation oncologist.
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Common questions
Radiosurgery for acoustic neuroma — your questions answered
Should I choose surgery or radiosurgery for an acoustic neuroma?
There is no single right answer, and both are accepted options. Size and position usually decide. Small and medium tumours that are not pressing on the brainstem are often suitable for radiosurgery, which is delivered without an incision. Large tumours, tumours causing pressure or fluid build-up, and tumours where the diagnosis itself is uncertain are usually managed with microsurgery. A small, quiet tumour in an older adult may simply be watched with repeat scans instead. Your radiation oncologist, neurosurgeon and ENT surgeon should give you a reason specific to your scan, not a general preference.
Will my hearing be preserved after radiosurgery for acoustic neuroma?
Radiosurgery aims to protect the hearing you still have. It cannot bring back hearing that is already lost, and no team can promise that hearing will stay the same. Hearing on the treated side tends to decline gradually over years in many patients, whether the tumour is treated or watched, because the tumour has already affected the hearing nerve. What helps is a baseline hearing test before treatment, careful planning that keeps the dose to the inner ear as low as possible, and repeat hearing tests during follow-up so any change is picked up early.
What happens to my balance after radiation for a vestibular schwannoma?
Most people are steadier after radiosurgery than they expect. Because the tumour grows slowly, the brain has usually already learned to rely on the other ear, the eyes and the feet for balance. Radiosurgery does not remove the balance nerve, so that adjustment is not suddenly undone. Some patients notice a few weeks or months of mild unsteadiness or brief spinning afterwards. Surgery is different: if the balance nerve is divided, vertigo is often intense for the first days and then settles as the brain compensates. Vestibular rehabilitation exercises help in both situations.
My scan shows the tumour got bigger after radiosurgery. Has treatment failed?
Not necessarily. A temporary increase in size, often with a dark centre on the scan where the contrast no longer takes up, is a well recognised pattern in the first six to eighteen months after radiosurgery. It reflects swelling and changes inside the tumour rather than true growth, and it usually settles without any further treatment. This is why teams do not judge the result from a single early scan. Your team will compare a series of scans over time. Tell them straight away about new facial weakness, severe headache, persistent vomiting or a sudden change in balance.
Can radiation for an acoustic neuroma affect my eye or my vision?
The optic nerves sit well away from an acoustic neuroma, so vision loss is not an expected effect of treating one, although no nerve outcome can be guaranteed. The real eye risk is indirect. The facial nerve runs beside the tumour, and if it becomes weak the eyelid may not close fully, which dries the surface of the eye. Report any new eye dryness, watering, redness, gritty pain or incomplete blink to your team at once. Lubricating eye care and an eye specialist review protect the surface of the eye while the nerve recovers.
Where is radiosurgery for acoustic neuroma delivered, and what does it cost?
CION Cancer Clinics does not own or operate a linear accelerator, CyberKnife or Gamma Knife unit, and CION is not itself NABH-accredited. Your radiosurgery is delivered at an NABH-accredited partner centre; CION Cancer Clinics coordinates your treatment plan, your oncology team and your care throughout, including imaging, hearing tests and follow-up. Costs are indicative only, as of August 2026, and vary with the platform, the number of sessions and the delivering centre, so a single figure is not meaningful. Ask for a written estimate and let our team check your insurance or scheme eligibility first.
This page explains radiation treatment for acoustic neuroma (vestibular schwannoma) in general terms. It is not a substitute for guidance from your own radiation oncology, neurosurgery and ENT team about your tumour, its size and position, and your hearing.