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Preventive thyroid removal in MEN2: how the age is decided | CION Cancer Clinics
In MEN2, the age for removing the thyroid depends on the exact RET gene change. For the highest-risk change, guidelines suggest surgery within the first year of life; for other high-risk changes, at or before age 5; for moderate-risk changes, often when blood tests start to rise. This page explains the risk groups, what surgery involves, life afterwards and what only your team can decide. CION Cancer Clinics’ surgical oncologists in Hyderabad can talk this through with you.
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Medically reviewed by Dr. Muralidhar MuddusettyConsultant Surgical Oncologist · MBBS (AIIMS), MS (Surgery, AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh) · last reviewed September 2026, next review due September 2027
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On this page
- At what age is the thyroid removed in MEN2?
- How does the RET change affect timing?
- What happens before a child's thyroid is removed?
- What changes for a child after the thyroid is removed?
- What do parents often worry about, and what is true?
- Which words will you see, and what do they mean?
- Who is this not for, and what can this page not tell you?
- Common questions about preventive thyroid removal in MEN2
The short answer
At what age is the thyroid removed in MEN2?
It depends on the exact RET gene change. For the highest-risk change, guidelines suggest removing the thyroid within the first year of life. For other high-risk changes it is usually done at or before age 5, and for moderate-risk changes the timing is often guided by regular blood tests.
Why the thyroid is removed before cancer appears
MEN2 is an inherited condition caused by a change in the RET gene. Almost everyone who carries it develops medullary thyroid cancer at some point. This cancer starts in the C cells of the thyroid and can spread early, sometimes before any lump can be felt. Removing the thyroid while it is still healthy, or while changes are very small, is how most teams prevent it.
Why a child's age is set by the gene
Different RET changes cause cancer at very different ages. That is why the gene report, not the child's symptoms, drives the timing. Relatives who carry the same family change are usually advised on the same basis.
This page explains how timing is usually decided. It cannot tell you when your own child should have surgery.By gene change
How does the RET change affect timing?
Guidelines sort RET changes into risk groups. Your genetic report should say which group the family change belongs to.
Highest risk
Usually the change known as M918T, often seen in MEN2B. Cancer can start in infancy, so surgery is usually suggested within the first year of life, by a surgeon experienced in operating on babies.
High risk
Changes such as C634 and A883F. Surgery is usually suggested at or before age 5. Blood test results can move it earlier.
Checked before surgery
- Calcitonin blood level
- Neck ultrasound
Moderate risk
Other RET changes, where cancer tends to appear later. Children are followed with regular blood tests and scans, and surgery is usually planned when calcitonin starts to rise. Some families prefer earlier surgery to avoid years of testing.
Not sure whether this applies to you?
Ask an oncologistThe pathway
What happens before a child's thyroid is removed?
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Testing the child
Once a RET change is known in the family, children can be tested with a blood sample. Many families test early, because timing for the highest-risk change starts in infancy.
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Blood tests and a neck scan
Calcitonin and CEA levels are measured, and an ultrasound looks at the thyroid and the lymph nodes in the neck, the small glands that can trap cancer cells.
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Checking the adrenal glands
In MEN2A and MEN2B, an adrenal gland tumour called a phaeochromocytoma can make hormones that raise blood pressure dangerously under anaesthesia. It is ruled out, or treated first, before any neck surgery in an older child or adult.
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Meeting the surgical team
You talk through the operation, the two main risks and how your child will be looked after. Ask how often the surgeon operates on children's thyroids.
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Time to prepare the family
Older children do better when told in simple words what will happen. Your team can help you find those words.
Afterwards
What changes for a child after the thyroid is removed?
The most important change is a daily thyroid hormone tablet, taken for life. Levothyroxine, sold in India under names such as Thyronorm and Eltroxin, replaces what the thyroid used to make. The dose is set by blood tests and changes as a child grows.
The two risks to ask about
The parathyroid glands sit beside the thyroid and control calcium. If they are bruised or removed, calcium can fall, causing tingling around the mouth or cramps. This is usually short-lived but can be permanent. The nerves to the voice box also run close by, and damage can change the voice. Both are more likely in very small children, which is why experience matters. Ask your surgeon for their own figures.
Growing up normally
With the right tablet dose, children grow, learn and play normally. Missed tablets show up as tiredness and poor school performance, so a routine the whole family follows helps.
Never change or stop the thyroid tablet without your doctor. Tell any new doctor that your child has no thyroid.Leave a number, we will call you
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Commonly believed
What do parents often worry about, and what is true?
"She is too young for such a big operation. We will wait until she is older."
For high-risk RET changes, waiting can allow cancer to start and spread before any sign appears. Timing is set by the gene for that reason. Discuss your concerns openly with the team before deciding.
"Without a thyroid, a child cannot live a normal life."
Children on the right daily tablet grow and develop normally. What matters is taking it every day and having regular blood tests.
"He has no lump and no symptoms, so the gene result must be wrong."
Medullary thyroid cancer can start long before any lump or symptom. A normal-feeling neck does not mean the thyroid is free of changes. That is why blood tests are used.
"Once the thyroid is out, the MEN2 problem is over."
MEN2 can also affect the adrenal glands, and in MEN2A the parathyroid glands. Checks for these usually continue for life.
On your report
Which words will you see, and what do they mean?
- RET
- The gene whose change causes MEN2. The exact change, such as M918T or C634, sets the risk group.
- MEN2A and MEN2B
- The two main forms of multiple endocrine neoplasia type 2. MEN2B usually carries the highest thyroid risk.
- Calcitonin
- A hormone made by the thyroid's C cells. A rising level can be an early sign of medullary thyroid cancer.
- Total thyroidectomy
- Removal of the whole thyroid gland.
- Hypoparathyroidism
- Low parathyroid hormone after surgery, leading to low calcium in the blood.
Being straight with you
Who is this not for, and what can this page not tell you?
Preventive thyroid removal is only for people with a confirmed harmful RET change. It is not offered for a family history of other thyroid cancers, or on an uncertain gene result. Adults found to carry a RET change are assessed differently, because cancer may already be present.
What this page cannot do
It cannot tell you your child's risk group, the right age for your child, or whether surgery should happen now. It cannot tell you what a particular centre offers. Those answers come from the gene report, the blood tests and a team experienced with children.
What to ask
Ask which risk group the family change belongs to. Ask whether the lymph nodes in the neck would be removed too, and why. Ask who will manage the thyroid tablet and calcium afterwards, and how often blood tests will be needed.
Questions we are asked
Common questions about preventive thyroid removal in MEN2
Should all our children be tested for the RET change?
When a RET change is known in a family, testing children is usually advised early, because the result decides whether and when surgery is needed. A genetic counsellor can explain the test and the result. It is a simple blood sample, and children who do not carry the change need no thyroid surgery.
Can we just do blood tests and wait?
For moderate-risk changes, many teams follow children with regular calcitonin tests and scans before surgery. For highest-risk and high-risk changes, waiting is usually not suggested, because cancer can begin before tests show it. Ask your team which applies to your family.
How long will my child stay in hospital?
Stays are usually short, but the team watches calcium levels closely before going home. If calcium falls, a child may stay longer and go home on calcium tablets for a while. Ask what warning signs to watch for at home.
Will there be a visible scar?
There will be a scar low in the front of the neck, usually placed in a natural skin crease. In children it often fades a great deal as they grow. Your surgeon can explain how to care for it while it heals.
What should we do if our child has tingling or cramps?
Tingling around the mouth or fingers, or muscle cramps, after surgery can mean low calcium. Call the surgical team the same day, or go to an emergency department if symptoms are severe. Do not wait for the next appointment.
Does the child need radioactive iodine afterwards?
Radioactive iodine does not treat medullary thyroid cancer, because C cells do not take up iodine. It is not part of preventive surgery for MEN2. Follow-up is with blood tests for calcitonin and CEA instead.
I am an adult and just found out I carry RET. Is it too late?
Adults found to carry a RET change are assessed with blood tests and scans, because cancer may already be present. Surgery is often still advised, but it may be planned as a cancer operation. Your team will explain what the tests show and what comes next.
Is thyroid surgery for MEN2 covered by schemes?
Cover for preventive surgery varies between schemes and insurers, and often needs the gene report and a specialist's letter. Aarogyasri, CGHS, ECHS and EHS rules differ. Call the helpline with your card or policy details and we will help you check your cover.
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Sources
- Cancer.Net — Multiple Endocrine Neoplasia Type 2
- National Cancer Institute — Thyroid Cancer
- American Cancer Society — Thyroid Cancer
- NHS — Thyroid cancer
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
Genetic Testing Before Preventive SurgeryHow the gene result is confirmed firstTalking to Your Family About Genetic RiskTelling relatives who may carry the same changeWho Is Offered Risk-Reducing Surgery?The gene changes where preventive surgery is discussedCaretaker and Family Guide to SurgeryLooking after someone before and after an operation
Talk to us
Has a RET change been found in your family?
Tell us what has been found so far and we will help you reach a specialist who can talk through timing for your family. One helpline serves every CION centre.