Laser Interstitial Thermal Therapy (LITT)
Updated: 3 days ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: October 2026
Laser interstitial thermal therapy (LITT) is a minimally invasive brain procedure that uses MRI-guided laser heat to destroy unhealthy brain tissue. It is used for conditions such as brain tumors, radiation damage, and epilepsy, and compared with open surgery it often offers greater precision and a faster recovery. Most people go home within one to two days [1].
Quick Answer: What is laser interstitial thermal therapy?
Laser interstitial thermal therapy (LITT) is a minimally invasive brain procedure in which a thin laser probe placed through a tiny skull opening uses MRI-guided heat to destroy unhealthy tissue. It treats brain tumors, radiation necrosis and drug-resistant epilepsy. It takes about two to five hours under general anesthesia, and most people go home in one to two days. [1]
What the research says
About 6 in 10 people with temporal lobe epilepsy became seizure-free after LITT. A systematic review and meta-analysis of 13 studies (551 patients) found a pooled seizure-freedom rate of 58% (95% CI 54% to 62%), rising to 66% (95% CI 58% to 74%) in people with mesial temporal sclerosis; the overall complication rate was 17% (95% CI 13% to 22%) (Kerezoudis et al., World Neurosurg, 2020 [2]).
Open surgery achieved seizure freedom more often, but with more minor complications. In a meta-analysis of mesial temporal lobe epilepsy with follow-up beyond 24 months, 72.5% of people were seizure-free after temporal lobe resection compared with 57.1% after LITT (P < 0.01), while minor complications were less frequent with LITT (4.1% vs 9.9%; P = 0.04) (Ekman et al., World Neurosurg, 2024 [3]).
Results were encouraging for brain metastases that came back after radiosurgery. A meta-analysis of 14 studies (470 patients, 542 lesions) found local control of 78.5% at 6 months and 69.0% at 12 months, with a pooled median survival of 17.15 months; local control at 6 months was better for radiation necrosis than for metastasis recurrence (87.4% vs 67.9%) (Chen et al., Int J Hyperthermia, 2021 [4]).
What Is Laser Interstitial Thermal Therapy?
Laser interstitial thermal therapy (LITT) is a minimally invasive brain procedure that uses MRI-guided laser heat to treat conditions such as brain tumors, epilepsy, and radiation damage. During LITT, a surgeon places a small tube through a tiny opening in your skull and uses focused heat to destroy unhealthy tissue. The laser targets the problem area while helping protect nearby healthy brain tissue [1].
Because the incision is very small, recovery is often faster and easier than with traditional open brain surgery. Providers may recommend LITT when a condition is difficult to reach with standard surgery or when open surgery may be too risky [1]. Real-time MRI lets the team see the target and monitor temperature while the treatment is happening [1].
What conditions does laser interstitial thermal therapy (LITT) treat?
LITT may treat or manage several conditions [1]:
Condition category | Specific applications |
|---|---|
Brain tumors | Gliomas and brain metastases. |
Epilepsy | Seizures that medications don't fully control. |
Radiation damage | Radiation necrosis or radiation-related tissue damage after cancer treatment. |
Recurrent conditions | Recurrent or hard-to-treat conditions. |
A laser probe passes through a small opening in the skull to reach the target tissue.
How does the laser interstitial thermal therapy (LITT) procedure work?
LITT usually takes about two to five hours from start to finish. The exact time depends on the size and shape of the treatment area and on how many times the surgeon needs to adjust the laser [1].
Preparation and Planning
Before surgery, you have exams and scans, such as an MRI, to plan the procedure. Your surgeon may adjust or stop certain medicines, such as blood thinners, and you will not eat or drink for several hours beforehand. Your team also reviews the risks, benefits, and what to expect [1]. Your care team uses MRI, and sometimes CT scans, to map the treatment area in your brain [1].
Surgical Execution
You receive general anesthesia, so you are asleep and feel no pain. Your care team positions your head carefully so the surgeon can guide the laser accurately. The surgeon makes a small cut in your scalp and a tiny hole in your skull, then guides a thin tube (the laser probe) to the target area. An MRI confirms that the probe is in the correct spot [1].
Thermal Destruction
When the probe is in place, the laser turns on and heats the abnormal tissue. Your team watches this in real time on MRI to control the treatment, and the surgeon may move the probe slightly to treat the whole area safely. The system continuously monitors temperature and stops if heat gets too close to healthy brain areas [1]. When treatment is complete, the surgeon removes the probe and closes the small incision [1].
Real-time MRI temperature mapping lets the team monitor heat while the laser works.
What does recovery after laser interstitial thermal therapy (LITT) involve?
One of the main advantages of LITT is a shorter recovery than open surgery. You usually stay in the hospital for one to two days so your care team can monitor you [1].
Immediate Recovery
It is normal to feel tired, have a headache or mild pain, or feel nauseated at first. In the days and weeks after surgery, temporary brain swelling can cause symptoms such as weakness, trouble speaking, or seizures, depending on the area treated. This can feel concerning, but it is often expected and may improve as the swelling goes down [1].
Long-Term Healing
Your provider may prescribe medicines such as steroids or anti-seizure medications to help manage symptoms during recovery. Over time, the treated area heals and returns to its proper size. Some changes get better quickly, while others take longer, and full healing can take weeks to months depending on your condition [1].
Recovery phase | Typical timeline |
|---|---|
Hospital stay | About 1 to 2 days |
Initial improvement | A few days to weeks |
Full healing | Weeks to months |
Recovery after LITT typically moves from hospital monitoring to gradual healing over weeks to months.
LITT may not cure the condition, but it may help you manage it or reduce symptoms, and it may slow disease progression [1].
What are the risks and side effects of laser interstitial thermal therapy (LITT)?
Laser interstitial thermal therapy (LITT) is generally safe, but like any procedure it can cause side effects. These are uncommon and may include [1]:
Neurologic symptoms: weakness, speech problems, or changes in sensation. These are often temporary but are sometimes long-lasting.
Brain swelling: can cause headaches or a temporary worsening of symptoms.
Seizures: new or worsening seizures.
Bleeding: usually small, but sometimes more serious.
Infection or other complications: such as fluid buildup.
There is also a small risk of injury to nearby healthy brain tissue or a slight misplacement of the probe, and your care team monitors you closely to help manage these risks [1]. In pooled studies of LITT for temporal lobe epilepsy, the overall complication rate was about 17% [2].
What is the bottom line on laser interstitial thermal therapy (LITT)?
LITT offers a precise, minimally invasive option for people with complex brain conditions. By combining laser heat with real-time MRI monitoring, it can treat tumors, radiation damage, and epilepsy with a shorter recovery than open surgery, though it may not cure the underlying condition [1]. If you or a loved one is considering the procedure, talk with a neurosurgical specialist about whether LITT is right for your situation.
Your next step: ask your care team which condition is being targeted, what results to expect, how long recovery usually takes in your case, and which symptoms need urgent attention [1].
Frequently Asked Questions
What is the main benefit of LITT over open surgery?
LITT is minimally invasive, needing only a small cut in the scalp and a tiny hole in the skull. That usually means a shorter hospital stay (often one to two days) and a faster recovery than open brain surgery [1].
Is LITT a cure for brain tumors?
LITT may not cure the condition, but it can help manage it, reduce symptoms, and may slow disease progression [1]. Depending on the condition, further treatment may still be needed, and your team will discuss this with you.
How long does the LITT procedure take?
About two to five hours from start to finish, depending on the size and shape of the treatment area and how many times the surgeon needs to adjust the laser [1].
Will I be awake during the procedure?
No. LITT is done under general anesthesia, so you are asleep and feel no pain [1].
How does the surgeon know where to put the laser?
The team maps the treatment area with MRI, and sometimes CT scans, before surgery. During the procedure, an MRI confirms that the probe is in the correct spot and shows the heat in real time [1].
What are the most common side effects of LITT?
Fatigue, headache or mild pain, and nausea are common at first. Temporary brain swelling can cause weakness, trouble speaking, or seizures that often improve as the swelling goes down [1].
Can LITT treat all types of epilepsy?
No. It is considered when medications don't fully control seizures. Pooled studies suggest it works best for well-defined lesions, such as mesial temporal sclerosis, and less well for non-lesional epilepsy or epilepsy with generalized seizures [1][5].
How long is the hospital stay after LITT?
Most people go home within one to two days [1].
Are there any restrictions after the surgery?
Your care team gives instructions based on what was treated. You may be prescribed steroids or anti-seizure medicines, and full healing can take weeks to months. Ask when you can return to exercise, work, and driving [1].
When should I contact my healthcare provider after LITT?
Contact your care team if you have a high fever, increasing redness or swelling at the incision, severe or worsening headaches, new or worsening seizures, or sudden changes in speech or movement. For severe symptoms, call your local emergency number.
How do I prepare for LITT?
You'll have exams and scans, such as an MRI, to plan the procedure. [1] Your surgeon may adjust or stop certain medicines, like blood thinners, and you won't eat or drink for several hours beforehand. [1] Your team also reviews the risks, benefits and what to expect before, during and after surgery. [1]
Related Reading
References
Cleveland Clinic. Laser Interstitial Thermal Therapy. Cleveland Clinic. May 10, 2026. https://my.clevelandclinic.org/health/procedures/laser-interstitial-thermal-therapy-litt
Kerezoudis P, Parisi V, Marsh WR, et al. Surgical outcomes of laser interstitial thermal therapy for temporal lobe epilepsy: systematic review and meta-analysis. World Neurosurg. 2020;143:527-536.e3. PMID 32750511. https://doi.org/10.1016/j.wneu.2020.07.194
Ekman FR, Bjellvi J, Ljunggren S, et al. Laser interstitial thermal therapy versus open surgery for mesial temporal lobe epilepsy: a systematic review and meta-analysis. World Neurosurg. 2024;192:224-235.e15. PMID 39332763. https://doi.org/10.1016/j.wneu.2024.09.090
Chen C, Guo Y, Chen Y, et al. The efficacy of laser interstitial thermal therapy for brain metastases with in-field recurrence following SRS: systematic review and meta-analysis. Int J Hyperthermia. 2021;38(1):273-281. PMID 33612043. https://doi.org/10.1080/02656736.2021.1889696
Chen JS, Lamoureux AA, Shlobin NA, et al. Magnetic resonance-guided laser interstitial thermal therapy for drug-resistant epilepsy: a systematic review and individual participant data meta-analysis. Epilepsia. 2023;64(8):1957-1974. PMID 36824029. https://doi.org/10.1111/epi.17560
Medical disclaimer
This article is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. The clinical information in this guide reflects source material last reviewed in May 2026.
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