Medical Oncologist
CION Cancer Clinics
Surveillance for NF2, SMARCB1 and LZTR1 carriers | CION Cancer Clinics
Surveillance means planned scans and tests that catch a growing tumour before it causes lasting harm. For NF2, that usually means MRI scans of the brain and spine, hearing tests and eye checks, starting in childhood. For SMARCB1 and LZTR1 the checks start later and are lighter. This page explains what each check does, how the plan changes through life, and which symptoms should not wait. At CION Cancer Clinics, our oncologists explain what a gene result means for you and your family, and plan the checks that follow.
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Medically reviewed by Dr. Naresh GunduConsultant Medical Oncologist · MBBS, DNB (Internal Medicine), DM (Medical Oncology, AIIMS) · last reviewed September 2026, next review due September 2027
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On this page
- What does surveillance for NF2 actually involve?
- Which tests are on the list, and what does each one look for?
- How does the plan change from childhood to adult life?
- How do NF2 checks differ from SMARCB1 or LZTR1 checks?
- What this page cannot tell you
- Four things families believe about NF2 checks
- Common questions about NF2 and schwannomatosis surveillance
The short answer
What does surveillance for NF2 actually involve?
It is a planned set of scans and tests, repeated through life, that looks for tumours while they are still small. In NF2 the tumours are almost always non-cancerous. They grow on nerves in the head and spine, where even a slow growth can cost hearing, balance or strength. Surveillance exists to find them early enough to protect those things.
Why it is different from cancer screening
Most screening is about catching a cancer. NF2 surveillance is mostly about catching a benign tumour before it presses on something that matters. The question after a scan is rarely whether this is cancer. It is whether the tumour is growing, and whether it is time to act. That is why the same small tumour can be watched for years in one person and treated early in another.
Who plans it
An NF2 plan is usually shared between a neurosurgeon, an ENT surgeon who looks after hearing, an audiologist, an eye specialist and a genetics team. The steadiest plans come from a clinic that sees many NF2 families. At CION, the genetics team can confirm the result, explain it in Telugu or English, and help you reach the right specialists.
Surveillance does not stop tumours forming. It finds them early, while there are more choices.The checks themselves
Which tests are on the list, and what does each one look for?
Four kinds of check make up most NF2 plans. Each one looks at a different part of the body.
MRI of the brain and spine
A magnetic scan, usually with a contrast injection. It shows schwannomas on the hearing nerves, meningiomas on the brain's lining and growths along the spine. It uses no radiation, which matters because it will be repeated many times.
Hearing tests
A test in a sound booth, plus a check of how clearly spoken words are understood. A falling score can be the first sign that a tumour on the hearing nerve is growing, sometimes before the scan changes.
Eye examination
Children and young people with NF2 can develop a clouding of the lens or changes at the back of the eye. An eye specialist looks for these, because early changes are easy to miss at home.
Skin and nerve examination
A doctor checks the skin for small tumours and tests strength, feeling and reflexes in the arms and legs.
Worth mentioning at every visit
- Numbness or tingling in a hand or foot
- Ringing in one ear
- Unsteadiness in the dark
- Weakness on one side of the face
Not sure whether this applies to you?
Ask an oncologistAcross a lifetime
How does the plan change from childhood to adult life?
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Early childhood
A child known to carry the family's NF2 fault is usually seen regularly for hearing, eye and skin checks and a nerve examination. Regular MRI often begins later, because young children may need sedation to lie still. It starts sooner if there are symptoms.
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Later childhood and the teenage years
Brain and spine MRI is added and hearing tests become routine. Scans are closer together at first, so the team can learn how fast any tumour is growing.
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Early adult life
For most people with NF2, the first tumours have shown themselves by now. The pace of scanning follows the last result. A stable picture can mean longer gaps. A growing tumour means shorter ones.
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Later adult life
Checks continue, because new tumours can still appear and old ones can change. The focus often shifts towards keeping hearing, balance and everyday independence for as long as possible.
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After any treatment
Surgery, radiotherapy or drug treatment changes the plan rather than ending it. Scans then watch the treated area as well as every other site.
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Symptoms that should not wait for the next scan
If hearing drops suddenly in one ear, over hours or a day or two, see an ENT doctor the same day. Treatment for sudden hearing loss works best when it starts early. New weakness in an arm or leg, loss of bladder or bowel control, a severe headache with vomiting, or new trouble swallowing also cannot wait. Go to the nearest emergency department and say the person has NF2.
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Side by side
How do NF2 checks differ from SMARCB1 or LZTR1 checks?
NF2
SMARCB1 or LZTR1
Checks usually begin in childhood
Checks usually begin in adult life
Tumours on the hearing nerves are the main concern
Tumours on nerves elsewhere, often painful, are the main concern
Hearing tests are central to the plan
Hearing is affected far less often
MRI of the brain and spine
MRI of the spine and body, sometimes the whole body
Scan spacing set closely by growth
Scans usually further apart
Being straight with you
What this page cannot tell you
It cannot give you your own schedule. NF2 varies widely between families, and even between a parent and a child with the same fault. When scans start, how far apart they are and what counts as a worrying change are set by the team that knows your scans.
It cannot read your scan or your report
A radiology report may describe sizes and changes in words that sound alarming. Only the team comparing it with earlier images can say whether it matters. What your specific variant means is a question for the counsellor who ordered the test.
Who this does not apply to
If a single tumour was found on one hearing nerve in later life, and nobody else in the family is affected, you most likely do not have NF2. Most such tumours are one-off growths. The plan on this page is for people with a confirmed or strongly suspected inherited fault.
Ask for your images on a disc or a download link, not just the printed report, so the next team can compare them properly.Commonly believed
Four things families believe about NF2 checks
"The scan was clear, so we can stop checking."
A clear scan is good news for now. In NF2 new tumours can appear years later, so checks continue through life, with the pace set by what the scans show.
"The tumours are not cancer, so they are not serious."
Most NF2 tumours are benign, but where they sit matters. A slow growth on a hearing nerve or inside the spine can still cost hearing, balance or strength. Protecting those is the whole point of surveillance.
"Radiotherapy is the simple answer for every tumour."
Radiotherapy is used in NF2, but more carefully than in people without it. In a small number of people with NF2 it has been linked with harmful later changes in the treated tumour, so it is weighed against surgery, drug treatment and watching.
"My child has no symptoms, so the scan can wait."
NF2 tumours often grow quietly for a long time before they cause symptoms. That quiet period is when the choices are widest. Skipping checks because a child seems well is how that window is most often lost.
Questions we are asked
Common questions about NF2 and schwannomatosis surveillance
How often will I need an MRI?
It depends on what the scans show. Scans are usually closer together at first, so the team can learn how fast any tumour is growing, then spaced out if things stay stable. A growing tumour brings the next scan forward. Your NF2 team sets the gap and changes it as your picture changes.
Does my child need to be sedated for an MRI?
Young children often cannot lie still for long enough, so sedation or a light anaesthetic is sometimes used. Older children usually manage awake, especially after a practice visit. Ask the scanning centre how they prepare children. A short, honest explanation beforehand helps most children more than anything else.
Is the contrast injection safe to repeat many times?
Contrast is used routinely, and most people have it many times without problems. There are open questions about tiny amounts staying in the body after repeated use, so teams give it when it genuinely adds information. Tell the scanning team about any kidney problem or past reaction before each scan.
Can a hearing test show a problem before the scan does?
Sometimes. A drop in how clearly words are understood can appear before a tumour visibly grows. That is why hearing tests sit alongside scans rather than replacing them. Keep a copy of every hearing report, so each new test can be compared with the one before.
Can surveillance be done in Hyderabad, or do we have to travel?
Much of it can be done here. MRI, hearing tests and eye checks are available in Hyderabad. The harder part is finding a team that sees NF2 often enough to judge small changes. Many families have routine checks near home and send the images to a specialist team for review.
What happens if a scan shows a tumour has grown?
Growth does not automatically mean surgery. The team looks at the size, the speed, what the tumour is pressing on and your hearing. Options include closer watching, surgery, radiotherapy and drug treatment. What your own result means is a question for the team who reviewed the scan.
Does SMARCB1 or LZTR1 schwannomatosis need the same checks?
No. These faults cause tumours on nerves elsewhere in the body far more often than on the hearing nerves, and pain is usually the main problem. Checks tend to start in adult life and are spaced further apart. The plan depends on symptoms and on what earlier scans found.
Will insurance or a government scheme pay for surveillance scans?
It varies. Some policies and schemes cover scans only once a tumour is diagnosed, not routine checks in a person who feels well. Ask your insurer in writing before a planned scan, and ask the hospital billing desk what Aarogyasri or Ayushman Bharat cover applies. Keep every report, as it supports any claim.
Your Specialists
Meet CION's oncologists. Bring your family history or genetic report to them.
Our medical oncologists see people with a strong family history of cancer, arrange genetic counselling and testing where it fits, and plan the checks that follow.
Medical Oncologist
Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
Medical Oncologist
Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
Medical Oncologist
Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
Medical Oncologist
Medical Oncologist
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Patient stories
Hear it from people we have treated
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Where to find us
Our centres in and around Hyderabad
Addressed by landmark, because that is how this city navigates. One helpline books a consultation at any of these centres, and your team will tell you where counselling and testing take place.
Warangal
Vizag
Sources
- GeneReviews (NCBI Bookshelf) — NF2-Related Schwannomatosis
- NHS — Neurofibromatosis type 2
- MedlinePlus Genetics — Schwannomatosis
- National Institute of Neurological Disorders and Stroke — Neurofibromatosis
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
Hearing surveillance and NF2The hearing tests in detail, and what a falling score meansNF2 positive: what happens nextThe first weeks after a positive resultSchwannomatosis vs NF2Why the three genes lead to different plansTesting the family for NF2 and schwannomatosis genesWhich relatives to test, and when children are included
Talk to us
Not sure whether your NF2 checks are on track?
Tell us what has been done so far and when. We will help you understand the result and reach the right specialists for the next check. One helpline serves every CION centre.