Thymectomy: Why It's Done, How It Works, and What Recovery Looks Like
Updated: 6 days ago
Written and medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: October 2026 · How we review
Quick Answer: What is a thymectomy?
A thymectomy is surgery to remove the thymus gland and any thymic tumor from the upper chest. It mainly treats myasthenia gravis and thymic tumors such as thymoma. Surgeons use open or minimally invasive approaches. Pain is usually mild and short-lived, but myasthenia gravis benefits can take a year or more to appear. [1]
What the research says
Thymectomy improved myasthenia gravis over 3 years. In a randomized trial of 126 adults with generalized myasthenia gravis, thymectomy plus prednisone lowered symptom scores (6.15 vs 8.99) and cut hospitalizations for flare-ups (9% vs 37%) compared with prednisone alone. (Wolfe et al., N Engl J Med, 2016) [2]
The benefit lasted to 5 years. In the trial's extension, patients who had thymectomy still had lower symptom scores (5.47 vs 9.34) and needed half the prednisone dose (24 mg vs 48 mg on alternate days). (Wolfe et al., Lancet Neurol, 2019) [3]
Robotic surgery shortened hospital stays. A meta-analysis of 10 matched studies (1,729 patients) found robot-assisted thymectomy led to less blood loss, fewer major complications and a hospital stay about 2.3 days shorter than open surgery. (Ahmed et al., J Robot Surg, 2025) [4]
Key takeaways
A thymectomy removes the thymus gland, which sits in the upper chest in front of the heart. [1]
The main reasons are myasthenia gravis and tumors of the thymus. [1]
Surgery can be open (through the breastbone) or minimally invasive (robotic or camera-guided). [1]
Most people stay at least one night in hospital, and surgical pain usually fades within two weeks. [1]
For myasthenia gravis, about 70% see fewer symptoms and less need for medication, usually within a year. [1]
What is a thymectomy?
A thymectomy is an operation to remove the thymus gland and any thymic tumors. The thymus lies in the upper chest, in front of the heart. [1]
Surgeons can reach the gland in several ways. The choice depends on your body mass index (BMI), any previous chest surgery or treatment, and the size of your thymus. [1]
It is not a common operation. Surgeons perform about 1,000 thymectomies a year in the United States. [1]
What conditions does a thymectomy treat?
A thymectomy treats problems that start in the thymus gland. [1] These include:
Condition | What it is | Why surgery helps |
Myasthenia gravis | An autoimmune condition that causes muscle weakness | Can reduce weakness, medicine needs and hospital stays |
Thymoma or thymic carcinoma | A tumor of the thymus, usually slow-growing | Removal can often cure it |
Neuroendocrine tumors | Tumors that can arise in the thymus | Removes the tumor |
Benign tumors | Noncancerous growths in the thymus | Removes the growth |
Read more in our guide to myasthenia gravis.
How do you prepare for a thymectomy?
Preparation for a thymectomy starts with a review of your medical history and a physical exam. [1] Your care team may also order tests to check your heart, lungs and the gland itself:
Test | What it checks |
Pulmonary function test | How well your lungs work |
Electrocardiogram (EKG) | Your heart's rhythm |
Cardiac stress test | How your heart copes with exertion |
CT scan | Detailed images of the chest and thymus |
MRI | Soft-tissue images of the chest |
PET scan | Activity in tissues, often used for tumors |
Before surgery:
Ask whether to pause any medicines or supplements. Only stop a medicine if your provider tells you to. [1]
Expect to stop eating and drinking at midnight before the operation. [1]
If you have myasthenia gravis, you may receive IV immunoglobulin or plasma exchange beforehand to help prevent breathing problems. [1]
Important: People with myasthenia gravis should not stop their regular myasthenia gravis medicines unless their surgeon or anesthesiologist clearly tells them to. [1]
What happens during a thymectomy?
During a thymectomy, the surgeon removes the thymus through either one larger chest incision or several small openings. [1] The operation usually takes two to four hours, depending on the approach and how complex the case is. [1]
Transsternal (open) approach
The surgeon divides the breastbone, fully or partly (a sternotomy).
The thymus and any affected nearby tissue are removed through the incision.
One or two chest tubes are placed to drain fluid.
The breastbone is closed with wires, then the skin is closed. [1]
Robotic-assisted or VATS approach
VATS stands for video-assisted thoracic surgery.
Three small ports are placed on one side of the chest, including one for a camera.
Robotic arms or long instruments separate the thymus (and any tumor) from nearby structures.
If needed, matching openings are made on the other side to finish the removal.
The tissue is placed in a bag and taken out through one small incision.
One or two chest tubes are placed for drainage.
Medicine is used to block chest-wall nerves to ease pain after surgery.
The ports are removed and the incisions closed. [1]
Feature | Transsternal (open) | Robotic-assisted or VATS |
Access | Breastbone divided | 3 small ports on one side |
Hospital stay | Longer | Shorter |
Blood loss | More | Less |
Pain | More | Less |
Return to normal activity | Slower | Faster |
Compared with open surgery, minimally invasive approaches can mean a shorter hospital stay, less blood loss, fewer complications, less pain and a faster return to normal activity. [1]
What happens right after a thymectomy?
Right after a thymectomy, the breathing tube is removed in the operating room and you move to a recovery room. [1] You'll receive oxygen, fluids and pain medicine at first. Most people move to a regular hospital room the same day. [1]
What are the benefits of a thymectomy?
The benefits of a thymectomy depend on why you need it. [1]
For people with myasthenia gravis, surgery can lead to:
Fewer hospital stays for myasthenia gravis
Less need for prednisone and other treatments
Less muscle weakness
Possible remission, meaning no weakness and no need for medicine [1]
For people with thymoma, a thymectomy can often cure this usually slow-growing cancer. [1]
How successful is a thymectomy?
A thymectomy for myasthenia gravis helps most people within about a year of surgery. [1]
Outcome in myasthenia gravis | Share of people |
At least fewer symptoms and less medication | About 70% |
Complete resolution of symptoms | 30% to 40% |
For thymoma, the chance of cure depends on the stage: [1]
Thymoma stage | Chance of cure | Extra treatment |
Stage I | Greater than 95% | Not specified |
Stage II | 75% to 80% | Radiation therapy may be added |
Stage III | 25% to 40% | With added radiation and chemotherapy |
What are the risks of a thymectomy?
The risks of a thymectomy include bleeding, lung problems and injury to nearby structures. [1] Possible complications are:
Injury to the heart, a nerve or a nearby blood vessel
Bleeding
Pneumothorax (collapsed lung)
Pneumonia
Hemothorax (blood between the lung and chest wall)
Chylothorax (lymphatic fluid between the lung and chest wall)
Very rarely, a myasthenic crisis triggered by the stress of surgery [1]
How long is recovery after a thymectomy?
Recovery after a thymectomy depends on whether you had open or minimally invasive surgery. [1] Most people stay in hospital for at least one night, and some need a little longer. Surgical pain is very treatable and should go away within about two weeks. [1]
When will myasthenia gravis improve?
Myasthenia gravis usually does not improve right away after a thymectomy. [1] Your provider judges the benefit about one year after surgery. Follow-up visits with your neurologist guide how long to continue your medicines, which are usually lowered slowly based on your symptoms. [1]
When can you go back to work or school?
The right time to return to work or school after a thymectomy differs for each person. [1] Fatigue from myasthenia gravis can delay a return to normal activities. People whose jobs involve a lot of standing or lifting need more recovery time than people with desk jobs. [1]
When should you call your doctor after a thymectomy?
Call your healthcare provider after a thymectomy if you notice any of these signs: [1]
Shortness of breath
Pain on one side of your chest
Fast breathing
Fast heart rate
Fever
Cough
Bleeding from a healing incision
Worsening myasthenia gravis symptoms
Conclusion
A thymectomy removes the thymus gland to treat myasthenia gravis and thymic tumors. Today, many operations use small incisions and robotic or camera-guided tools, which can shorten hospital stays and ease pain. Recovery from the surgery itself is usually quick. For myasthenia gravis, the real payoff tends to build over the following year, with most people needing less medicine and many seeing major improvement.
If you or someone you care for has been offered a thymectomy, ask your surgeon why they recommend a specific approach, and bring your questions to your neurologist too.
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FAQ
What is a thymectomy?
A thymectomy is surgery to remove the thymus gland and any thymic tumors from the upper chest. It is mainly used to treat myasthenia gravis and tumors of the thymus.
Why would someone need a thymectomy?
A thymectomy is most often done for myasthenia gravis or a thymic tumor. Other reasons include neuroendocrine tumors and benign (noncancerous) tumors of the thymus.
How long does a thymectomy take?
A thymectomy usually takes two to four hours. The exact time depends on the surgical approach and how complex the case is.
Is a thymectomy major surgery?
A thymectomy is chest surgery done with a breathing tube in place, either through the breastbone or through small openings with robotic or camera-guided tools. Most people stay in hospital for at least one night.
How long is recovery after a thymectomy?
Recovery after a thymectomy is usually quick, and surgical pain should go away within about two weeks. Minimally invasive surgery often allows a faster return to normal activity than open surgery.
Does a thymectomy cure myasthenia gravis?
A thymectomy can lead to remission of myasthenia gravis in some people, with 30% to 40% seeing complete resolution of symptoms. About 70% have at least fewer symptoms and less need for medicine, usually within a year.
What are the risks of a thymectomy?
The risks of a thymectomy include bleeding, pneumonia, a collapsed lung, fluid or blood around the lung, and injury to the heart, a nerve or a blood vessel. Very rarely, surgery can trigger a myasthenic crisis.
When should I call my doctor after a thymectomy?
Call your doctor after a thymectomy if you have shortness of breath, one-sided chest pain, fast breathing, a fast heart rate, fever, cough, bleeding from the incision, or worsening myasthenia gravis symptoms.
Can thymectomy be done with robotic surgery?
Yes. Many thymectomies are done through small cuts using robotic or camera-guided tools. Compared with open surgery, this can mean less pain, less blood loss and a shorter hospital stay.
Can you live a normal life without a thymus?
Yes. In adults, the thymus has already done most of its work training the immune system, so most people live normally after it is removed.
Related Reading
What Is Myasthenia Gravis? A Plain-Language Guide to This Muscle Weakness Condition explains myasthenia gravis symptoms, diagnosis and treatment options.
Thymoma and Thymic Carcinoma: Symptoms, Treatment and Outlook covers tumors of the thymus and how they are treated.
Video-Assisted Thoracic Surgery (VATS): Procedure and Benefits explains how camera-guided chest surgery works and its recovery.
Sternotomy: Procedure, Recovery Timeline, Wires and Warning Signs describes surgery through the breastbone and how it heals.
References
Cleveland Clinic. Thymectomy: What To Expect. Cleveland Clinic. Last updated June 14, 2023. https://my.clevelandclinic.org/health/treatments/25041-thymectomy
Wolfe GI, Kaminski HJ, Aban IB, et al. Randomized Trial of Thymectomy in Myasthenia Gravis. N Engl J Med. 2016;375(6):511-522. PMID 27509100. https://doi.org/10.1056/NEJMoa1602489
Wolfe GI, Kaminski HJ, Aban IB, et al. Long-term effect of thymectomy plus prednisone versus prednisone alone in patients with non-thymomatous myasthenia gravis: 2-year extension of the MGTX randomised trial. Lancet Neurol. 2019;18(3):259-268. PMID 30692052. https://doi.org/10.1016/S1474-4422(18)30392-2
Ahmed A, Abdel Aziz TA, AlAsaad MMR, et al. Robot-assisted versus open thymectomy a systematic review and meta-analysis of propensity score matched studies. J Robot Surg. 2025;19(1):421. PMID 40711599. https://doi.org/10.1007/s11701-025-02601-0
Medical disclaimer
This article is for general education only and does not replace advice from a qualified healthcare professional. Always talk with your doctor about your own diagnosis, treatment options and recovery.
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