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What Is Laser Interstitial Thermal Therapy?

Laser interstitial thermal therapy is a minimally invasive procedure that destroys abnormal tissue with heat generated by a laser placed directly into a target. It is commonly abbreviated LITT. In neurosurgery, magnetic resonance imaging (MRI) is used to guide a thin laser catheter into a brain lesion and monitor temperature changes during treatment. LITT is used for selected brain tumors, radiation necrosis, epileptic seizure foci, and other intracranial abnormalities that can be difficult to reach safely with open surgery.

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What Is Laser Interstitial Thermal Therapy?

Laser interstitial thermal therapy is a minimally invasive procedure that destroys abnormal tissue with heat generated by a laser placed directly into a target. It is commonly abbreviated LITT. In neurosurgery, magnetic resonance imaging (MRI) is used to guide a thin laser catheter into a brain lesion and monitor temperature changes during treatment. LITT is used for selected brain tumors, radiation necrosis, epileptic seizure foci, and other intracranial abnormalities that can be difficult to reach safely with open surgery.

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Why Is Laser Interstitial Thermal Therapy Performed?

LITT is considered when a precisely targeted intracranial lesion can be treated by thermal ablation and a minimally invasive approach is preferable to open resection. It is used for selected primary and metastatic brain tumors, recurrent lesions, radiation necrosis, and drug-resistant focal epilepsy. The technique can be particularly useful for deep or surgically challenging targets because the laser catheter reaches the lesion through a small skull opening. Treatment selection depends on lesion size, shape, location, proximity to critical neural structures, previous radiation or surgery, and the overall treatment goal.

How Is Laser Interstitial Thermal Therapy Performed?

The surgeon creates a small opening in the skull and places a laser catheter into the target using stereotactic navigation. The patient is moved into an MRI environment, where thermal imaging provides real-time estimates of tissue temperature as laser energy is delivered. The laser heats the target in a controlled fashion while software helps the team monitor the predicted boundary of thermal injury and protect nearby structures. Treatment stops when the planned ablation volume is reached or when temperature limits near sensitive tissue require the procedure to end.

What Is Recovery Like After Laser Interstitial Thermal Therapy?

Recovery is usually shorter than after a large open craniotomy because the surgical access is limited to a small catheter tract. Patients are monitored for brain swelling, bleeding, seizures, headache, and new neurologic deficits after the procedure. Corticosteroids can be used to control treatment-related cerebral edema when needed. Follow-up MRI evaluates the ablation zone, swelling, tumor response, or seizure-control outcome over the following weeks and months.

What Are the Risks and Complications?

Possible complications include cerebral edema, intracranial hemorrhage, seizures, infection, thermal injury to nearby brain tissue, and new neurologic deficits. Swelling around the ablation zone can temporarily worsen symptoms and can occasionally require additional treatment or surgery. Damage to critical structures can cause permanent weakness, language problems, vision changes, memory deficits, or other neurologic impairment depending on the target location. The treated tumor or seizure focus can also persist or recur if the entire pathological tissue cannot be safely ablated.

Frequently Asked Questions About Laser Interstitial Thermal Therapy

Is LITT open brain surgery?

No. It is a minimally invasive neurosurgical procedure that usually reaches the target through a small skull opening and a narrow laser catheter.

How does MRI help during LITT?

MRI guides catheter placement and provides real-time thermal monitoring so the team can estimate which tissue is being heated and protect nearby structures.

Can LITT treat epilepsy?

Yes. MRI-guided LITT is used for selected patients with drug-resistant focal epilepsy when the seizure-generating tissue can be safely targeted.

What are the most common serious complications of LITT?

Published reviews identify cerebral edema, focal neurologic deficits, and intracranial hemorrhage among the most important complications.

References

MR-guided laser interstitial thermal therapy in the treatment of brain tumors and epilepsy. PubMed. https://pubmed.ncbi.nlm.nih.gov/39167226/. Date Accessed September 11, 2026.

Complications following laser interstitial thermal therapy: a review. PubMed. https://pubmed.ncbi.nlm.nih.gov/39413572/. Date Accessed September 11, 2026.

Contemporary Applications of Laser Interstitial Thermal Therapy: A Comprehensive Systematic Review. PubMed. https://pubmed.ncbi.nlm.nih.gov/39419170/. Date Accessed September 11, 2026.

Laser interstitial thermal therapy (LITT) for brain metastases: a systematic review and pooled analysis of Efficacy/Safety and the role of combination treatments. PubMed. https://pubmed.ncbi.nlm.nih.gov/42265512/. Date Accessed September 11, 2026.

Outcomes after laser interstitial thermal ablation for temporal lobe epilepsy: a systematic review and meta-analysis. PubMed. https://pubmed.ncbi.nlm.nih.gov/37779130/. Date Accessed September 11, 2026.