Thymus removal (Thymectomy)
An operation to remove the thymus gland from the front of the chest, usually for a thymus tumour (thymoma) or to help control myasthenia gravis.
✓ Medically reviewed by a GMC-registered consultant · last reviewed September 2026 · next review September 2027 · how we review
In short
- Thymectomy removes the thymus gland, usually for a thymus tumour (thymoma) or to help control myasthenia gravis.
- For myasthenia gravis it is not a quick fix — benefit can take months to years and is not guaranteed.
- It can often be done with keyhole or robot-assisted surgery, but larger tumours may need the breastbone to be opened.
- This is chest surgery under general anaesthetic, so it should be done by a cardiothoracic surgeon in a unit that does it regularly.
A plain-English summary. The detail — including risks and recovery — is below.
At a glance
A general guide. Your surgeon will give you advice for your situation.
Removes a thymus tumour so it can be examined and, where possible, fully treated
You are not fit enough for a general anaesthetic and chest surgery, where the risks may outweigh the benefit.
You are watched closely, sometimes in a high-dependency area. Drains and the urinary catheter come out as you recover, and you are helped to move, breathe...
Close monitoring of breathing after surgery, with clear escalation if it worsens.
You are watched closely, sometimes in a high-dependency area. Drains and the urinary catheter come out as you...
Most people go home within a few days and feel tired. Wounds are healing; pain is controlled with tablets. Avoid...
Energy improves and many people return to light activities and work. After open (breastbone) surgery, lifting and...
Most physical recovery is complete by a few months. In myasthenia gravis, any improvement in weakness often...
What is thymus removal (thymectomy)?
The thymus is a small gland that sits behind the breastbone, in front of the heart. It is part of the immune system and is most active in childhood. Thymectomy is an operation to remove it.
There are two main reasons it is done. The first is a growth in the thymus, most often a tumour called a thymoma, which usually needs to be removed and examined under a microscope. The second is an autoimmune condition called myasthenia gravis, where removing the thymus can, over time, reduce muscle weakness and the amount of medicine needed.
The gland can be reached in different ways: through small cuts between the ribs (keyhole or robot-assisted surgery), or through a cut that divides the breastbone (an open approach) for larger or more difficult tumours. Your surgeon chooses the approach based on the reason for surgery, the size and position of any growth, and your overall health.
It is important to be realistic. For a thymoma, surgery aims to remove the tumour completely. For myasthenia gravis, thymectomy is not an instant cure: many people improve and some go into remission, but this can take months to years, and a few notice little change.
Types & techniques
There isn't one single operation. The right approach depends on you — which is something to discuss with your surgeon.
Keyhole vs open (breastbone) thymectomy
| Feature | Keyhole / robotic | Open (sternotomy) |
|---|---|---|
| Cuts | Small, between ribs | Down the breastbone |
| Recovery | Usually quicker | Usually longer |
| Best for | Smaller tumours, myasthenia | Larger or tricky tumours |
| Driving/lifting | Restricted for a while | Restricted for longer |
The right approach depends on the reason for surgery and the size and position of any growth. Your surgeon will explain why one suits you.
Preparing for your surgery
- See the operating cardiothoracic surgeon, who will explain the approach (keyhole, robotic or open) and why it suits you.
- If you have myasthenia gravis, your neurologist and surgeon should plan your medicines and timing together, as surgery can affect symptoms.
- Expect scans (such as a CT) of the chest and blood tests before surgery.
- Tell the team about all medicines and supplements, especially blood thinners, and ask what to stop and when.
- Stop smoking as far in advance as you can, as this lowers the risk of chest and wound problems.
- Arrange time off work, help at home, and a lift home, as you should not drive straight after chest surgery.
- Ask whether you may need a short stay in a high-dependency or intensive care area, especially with myasthenia gravis.
What happens
Thymectomy is done under general anaesthetic, so you are asleep throughout. After you are asleep, the surgeon reaches the thymus either through small cuts between the ribs (keyhole or robotic) or by dividing the breastbone (open surgery).
The thymus, and any tumour and surrounding fatty tissue, is carefully separated from nearby structures, including large blood vessels, the lining around the heart and the nerves that control the diaphragm. The tissue is removed and sent to the laboratory.
One or more drains may be left in the chest for a short time to remove air and fluid, and these are taken out on the ward over the following days. You wake up in a recovery area, and some people, particularly those with myasthenia gravis, are watched in a high-dependency or intensive care area at first to keep a close eye on breathing.
Is this operation right for me?
A good consultation should explore whether it's the right choice for you now — including reasons to wait or consider something else.
May not be suitable if…
- You are not fit enough for a general anaesthetic and chest surgery, where the risks may outweigh the benefit.
- Your myasthenia gravis only affects the eyes (ocular myasthenia), where thymectomy is not usually recommended unless there is another reason such as a thymoma.
- A thymoma has spread widely so that surgery alone is unlikely to help, and other treatments are needed first.
- Your myasthenia is poorly controlled, so symptoms should be stabilised before planning surgery.
Delay surgery if…
- You have an active chest or other infection.
- Your myasthenia gravis is unstable, with worsening weakness, breathing or swallowing problems.
- Blood-thinning medicines have not yet been safely managed.
- Important scans or assessments are not yet complete.
- You are pregnant or could be, until this has been discussed with the team.
Alternatives to discuss
- Medicines alone for myasthenia gravis, managed by a neurologist, without surgery.
- Watchful monitoring of a very small thymus growth in selected cases.
- Non-surgical cancer treatments, such as radiotherapy or chemotherapy, where a thymoma cannot be removed safely.
- A second opinion from a specialist cardiothoracic or neurology centre before deciding.
Before you decide
Use this as a shared-decision checklist. The aim is not just “can this be done?”, but whether it is right for you, now, with the risks and alternatives clearly understood.
What matters most to me?
Think about symptoms, daily life, work, caring responsibilities, sport, fertility, travel, appearance and anxiety — the right choice depends on your priorities, not just the medical facts.
What are all my options?
Ask about waiting, monitoring, medicines, rehabilitation, a smaller or larger procedure, a different test, NHS referral, or a second opinion where that would help.
What would make me pause?
Active infection, pregnancy, unstable medical problems, smoking, medicines that increase bleeding, poor support at home, or feeling pressured are all reasons to slow down and get tailored advice.
What happens if I do nothing today?
For some problems, waiting is safe; for others, delay can make treatment harder. A good consultation should explain the trade-off in plain English.
Anaesthetic choices
The safest option depends on the operation, your health, the facility and your surgeon/anaesthetist. Ask what is planned and why.
Benefits
- Removes a thymus tumour so it can be examined and, where possible, fully treated
- Can reduce muscle weakness in myasthenia gravis over time, and the amount of medicine needed
- Provides a tissue diagnosis that guides any further treatment
- Keyhole and robotic approaches can mean less pain and a quicker recovery than open surgery
- Can lower the chance of a thymoma growing or spreading if removed completely
Risks & complications
- Pain and tiredness for a few weeks, especially after open surgery
- Bruising, numbness or tingling around the wounds
- A temporary cough, breathlessness or reduced energy
- Chest infection or a collection of air or fluid needing a drain
- Wound infection or slow healing
- Bleeding that may need a blood transfusion or a return to theatre
- Injury to the nerve that controls the diaphragm (phrenic nerve), causing breathlessness
- A flare of myasthenia gravis affecting breathing (myasthenic crisis), sometimes needing breathing support
- Injury to large blood vessels, the heart lining or nearby structures
- Blood clots in the legs or lungs
- Serious complications that, very rarely, can be life-threatening
The biggest specific concerns are breathing problems after surgery and, in myasthenia gravis, a flare of weakness called a myasthenic crisis. Ask how your breathing and myasthenia medicines will be managed around the operation, whether you might need intensive-care monitoring, and how the surgeon protects the phrenic nerves that control the diaphragm.
Published figures to discuss
Risk depends heavily on the reason for surgery, the approach, the size of any tumour and your general health, especially how well-controlled any myasthenia gravis is. Reliable single percentages are hard to quote because studies mix different patients and techniques, so the figures below are best treated as cautious guides and discussed with your surgeon.
| Figure | Reported range | How to interpret it | Source / confidence |
|---|---|---|---|
| Myasthenia gravis improvement after thymectomy | Often delayed over months to years; remission or medication reduction varies by patient group | Thymectomy is not an immediate cure, and medical treatment usually continues during recovery. | Guide sourcesClinical context |
| Myasthenic crisis or breathing weakness after surgery | Uncommon but important in myasthenia gravis | Pre-operative optimisation and post-operative respiratory monitoring are central. | Thymectomy for myasthenia gravis (review) — PMCpmc.ncbi.nlm.nih.govSource-linked context |
| Bleeding, phrenic nerve or recurrent laryngeal nerve injury | Uncommon | These can affect breathing, diaphragm movement or voice and should be part of consent. | Thymectomy for myasthenia gravis (review) — PMCpmc.ncbi.nlm.nih.govSource-linked context |
| Conversion from keyhole/robotic to open surgery | Uncommon but recognised | Conversion may be needed for bleeding, adhesions or tumour invasion. | Thymectomy for myasthenia gravis (review) — PMCpmc.ncbi.nlm.nih.govSource-linked context |
These are literature figures, not a personalised prediction. Your own risks and likely benefits depend on your circumstances, your health, and how your care is carried out and followed up.
Recovery — what to expect, and when
Recovery depends a lot on the approach. Keyhole and robotic surgery usually allow a quicker return to normal life, while open surgery that divides the breastbone takes longer because the bone needs time to heal.
- Feeling tired and needing more rest than usual for several weeks
- Discomfort, tightness or numbness around the wounds or breastbone
- A weaker cough or feeling short of breath on exertion at first
- Slow, gradual change in myasthenia symptoms rather than a sudden improvement
Aftercare
- Take pain relief as advised so you can breathe deeply, cough and move about.
- Do the breathing exercises the team teaches you to lower the risk of chest infection.
- Keep wounds clean and dry and follow advice on showering and dressings.
- Avoid heavy lifting, and after breastbone surgery follow specific limits on pushing, pulling and driving.
- If you have myasthenia gravis, keep taking your medicines exactly as planned and do not change them without advice.
- Build up walking and gentle activity gradually rather than all at once.
- Go to all follow-up appointments, including those to discuss the laboratory results.
- Pain relief collected and a plan for taking it
- Time off work arranged (longer for open surgery)
- Someone to help at home for the first week or two
- A lift home and cover for driving while restricted
- Myasthenia medicine plan written down and clear
- Contact number for the surgical team saved
- Follow-up and results appointment booked
Scars and how they heal
Keyhole and robotic surgery leave a few small scars between the ribs, which usually fade well. Open surgery leaves a longer scar down the front of the chest over the breastbone. Scars are firm and pink at first and soften and pale over months. Protecting healing scars from the sun helps them settle.
⚠ Get urgent help if…
- New or worsening shortness of breath, or difficulty breathing — seek urgent help
- Increasing weakness, difficulty swallowing or a weak cough (possible myasthenic flare)
- Chest pain, palpitations or feeling faint
- A high temperature, or a wound that is red, hot, swollen or leaking
- Coughing up blood, or sudden severe breathlessness
- A swollen, painful calf, which can signal a blood clot
Who to contact: your surgeon or clinic first (keep their number to hand). For urgent advice when you can't reach them, call NHS 111. In an emergency, call 999.
General guidance — it doesn't replace the specific advice your surgeon gives you.
Results & realistic expectations
For a thymoma, a good result means the tumour has been removed and the laboratory confirms the type and whether it was fully removed. This guides whether any further treatment, such as radiotherapy, is needed, and what follow-up scans are sensible.
For myasthenia gravis, success usually means gradually less muscle weakness and less reliance on medicines over months to years. Improvement is not guaranteed and varies from person to person, so your neurologist will keep reviewing your treatment alongside the surgery.
Removing a thymoma completely offers the best chance of long-term control, but because some thymomas can come back, regular follow-up scans are usually advised for several years. In myasthenia gravis, any improvement from thymectomy tends to build slowly and can be long-lasting, though many people still need some medicine and ongoing neurology review.
Combining with other procedures
Thymectomy is part of wider care rather than a stand-alone fix. For a thymoma, it may be combined with radiotherapy or other cancer treatments depending on the laboratory results. For myasthenia gravis, it sits alongside medicines managed by your neurologist, and the timing of surgery is planned around your symptoms and treatment.
Follow-up & long-term care
You will usually be seen in clinic a few weeks after surgery to check healing and discuss the laboratory results. For a thymoma, follow-up scans are typically arranged over several years to watch for any recurrence. If you have myasthenia gravis, your neurologist continues to review your symptoms and adjust medicines.
- Regular follow-up scans for several years after removal of a thymoma
- Ongoing neurology review and medicine adjustment for myasthenia gravis
- Prompt review if symptoms of weakness, breathing or swallowing change
Revision and secondary surgery reality
- A thymoma can sometimes come back, which is why surveillance scans are arranged for years afterwards.
- If a tumour was not fully removed, further surgery or other treatment may be needed.
- In myasthenia gravis, improvement can be slow and partial, and most people still need some ongoing medicine.
Ask your surgeon for their own revision rate, what counts as a revision, and what is included in the written aftercare policy.
What good aftercare looks like
- Close monitoring of breathing after surgery, with clear escalation if it worsens.
- Joint follow-up between the cardiothoracic surgeon and the neurologist for people with myasthenia gravis.
- A clear plan and contact route for any flare of weakness, swallowing or breathing problems.
- A written results and surveillance plan, including any scans needed for a thymoma.
- Breathing exercises and a gradual, supported return to normal activity.
What affects the cost
Costs vary a great deal between people and providers, and we don't publish prices. What matters is understanding what drives the cost and making sure your quote is complete. The main things that affect it:
- Whether surgery is keyhole, robot-assisted or open, and the theatre time needed
- Surgeon and anaesthetist fees
- Length of hospital stay, including any high-dependency or intensive-care time
- Pre-operative scans (such as CT) and tests
- Laboratory analysis of the removed tissue
- Any further treatment, such as radiotherapy, after the results
- Follow-up appointments and surveillance scans
- The operating surgeon's and anaesthetist's fees
- Hospital/theatre fee and expected length of stay, including possible high-dependency care
- Pre-operative scans and tests, and laboratory analysis of the thymus
- What is included if you need a longer stay or a return to theatre
- Follow-up appointments and surveillance scans
- The cancellation policy
- What happens, and who pays, if a complication occurs
On the NHS? Thymectomy is routinely available on the NHS when clinically indicated, such as for a thymoma or to help control myasthenia gravis; private access is mainly used for speed, choice of surgeon or a second opinion.
You're entitled to your total cost in writing — including aftercare and any revision — before you decide.
Consent traps and marketing red flags
These are not small details. They are often where patients lose choice, time to reflect, or realistic expectations.
Consent traps
- Being told thymectomy will cure myasthenia gravis, rather than that it may help over time.
- No clear plan for managing myasthenia medicines and breathing around the operation.
- No discussion of the chance of needing intensive-care monitoring after surgery.
- No mention of phrenic nerve injury or the possibility of converting from keyhole to open surgery.
- No written aftercare plan or emergency contact for breathing or weakness problems.
Marketing red flags
- Promising a cure or guaranteed remission of myasthenia gravis.
- Selling robotic surgery as without risks or always better, without explaining when open surgery is safer.
- Downplaying that this is major chest surgery under general anaesthetic.
- No mention of the cardiothoracic unit's experience or results.
Choosing a surgeon safely
- Check your surgeon is on the GMC Specialist Register for this area.
- Make sure they practise at a CQC-registered location, and look for membership of bodies like BAAPS or BAPRAS.
- You're entitled to a two-stage consent process with time to reflect (a cooling-off period). The surgeon who will operate must consent you — not a salesperson.
- Be wary of pressure: time-limited offers, discounts or deposits taken before you've had time to think are red flags, not bargains.
- You're entitled to your total cost in writing — including aftercare and any revision — before you decide.
Questions to ask your medical professional
Take this to your consultation. A good surgeon will welcome every one of these.
- Why is thymectomy being recommended for me, and what happens if I do not have it?
- Will you use a keyhole, robotic or open approach, and why?
- If I have myasthenia gravis, how will my medicines and breathing be managed around surgery?
- How will you protect the nerves to my diaphragm and the structures near the thymus?
- What do the laboratory results change, and will I need any treatment afterwards?
- How often do you do this operation, and what are your unit's results?
- Are you on the GMC Specialist Register for this area, and which Royal College or professional body are you a member of?
- Will you be the surgeon who carries out my operation, and who looks after me afterwards?
- What are the risks for someone like me, and how often do your own patients have a problem or need it repeated or redone?
- What does a realistic result look like — and what can this operation not achieve?
- What are my options, including waiting, doing nothing for now, or choosing a different approach?
- Can I have written information, results and aftercare instructions in a format I can use, including any accessibility or communication support I need?
- What is the total cost in writing, including any follow-ups, and how much time do I have to decide?
Frequently asked questions
Can I have a thymectomy on the NHS?
Will removing my thymus cure my myasthenia gravis?
Will I have my breastbone cut open?
Do I need my thymus as an adult?
How long will I be off work?
Is thymectomy dangerous?
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How we made this page
Medically reviewed by a GMC-registered consultant. Written in plain English, checked against NHS, NICE, GMC and relevant Royal College / specialist-society guidance, and kept under review. No clinic paid to appear on this page, and we publish no pricing. This is general information to help you prepare — it is not a substitute for advice from your own clinician. How we review our guides →
Source hierarchy: UK regulator and NHS/NICE guidance first, then relevant Royal College or specialist-society guidance, then peer-reviewed evidence for procedure-specific figures where available.
Sources & standards: NHS — Myasthenia gravis: treatment SCTS — Thymectomy (patient information) UCLH — Having a thymectomy procedure Thymectomy for myasthenia gravis (review) — PMC Value of thymectomy in non-thymomatous myasthenia gravis — PMC
Reviews reflect patients' experience of care, not clinical outcomes. For procedure volumes and outcome data see PHIN.
Last medically reviewed 2026-09-21. Spotted something wrong or out of date? Report an error in this guide.
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