Laser Interstitial Thermal Therapy (LITT) for Epilepsy

Laser interstitial thermal therapy (LITT) is a minimally invasive stereotactic technique that uses laser-generated heat to ablate selected epileptogenic tissue under real-time MRI temperature monitoring.

It is increasingly used in specialist epilepsy centres, particularly for mesial temporal lobe epilepsy and selected deep or well-defined lesions.

How LITT works

A thin laser catheter is inserted through a small skull opening using stereotactic guidance.

During treatment, MRI thermometry estimates tissue temperature and helps the surgeon control the ablation zone.

Why it is attractive

LITT usually requires a much smaller surgical opening than conventional resection.

Potential advantages include shorter hospital stay, less disruption of overlying brain tissue and a potentially faster physical recovery.

Mesial temporal lobe epilepsy

One of the most established epilepsy applications is ablation of the amygdala and hippocampal region in carefully selected drug-resistant mesial temporal lobe epilepsy.

The procedure is often called laser amygdalohippocampotomy.

Seizure freedom compared with open temporal surgery

Evidence consistently suggests that open temporal resection achieves higher average long-term seizure-freedom rates than LITT for mesial temporal lobe epilepsy.

A 2024 meta-analysis reported seizure freedom above 24 months in about 57% after MR-guided LITT compared with about 73% after temporal lobe resection.

A larger 2025 comparative meta-analysis similarly found higher seizure-freedom rates with open resection, while LITT had shorter hospital stays and lower overall morbidity.

Why someone might still choose LITT

The balance is individual.

Some people may value a less invasive operation, shorter recovery or potentially lower risk to particular cognitive functions even if average seizure-freedom rates are somewhat lower.

Cognitive outcomes

Because LITT can spare lateral temporal neocortex, it may reduce some naming and language risks compared with open dominant-temporal resections.

However, memory decline can still occur, particularly when the hippocampal structures being ablated are functionally important.

Visual-field effects

Damage to nearby optic pathways can produce visual-field deficits.

Precise trajectory planning and thermal monitoring are used to reduce this risk.

Hypothalamic hamartoma

LITT is also used in some centres to disconnect or ablate hypothalamic hamartomas causing gelastic seizures.

Deep lesion location makes stereotactic thermal treatment particularly attractive in selected patients.

Focal cortical dysplasia

Selected focal cortical dysplasias can be treated with LITT when the epileptogenic target is compact and can be safely reached.

A 2025 study of bottom-of-sulcus dysplasia found promising seizure outcomes comparable with open surgery in that carefully selected cohort.

Extratemporal epilepsy

Recent evidence also describes LITT for extratemporal epilepsy, but patient numbers are smaller and causes are more heterogeneous than in mesial temporal disease.

What LITT cannot solve

LITT is less suited to broad, poorly defined or distributed epileptogenic networks.

Ablating only part of the true epileptogenic zone can leave seizures unchanged or lead to recurrence.

Repeat treatment and later open surgery

If seizures continue after LITT, some people undergo repeat ablation or conventional resective surgery.

Having LITT first does not automatically prevent later open surgery.

Evidence limitations

A 2026 overview of systematic reviews found that most LITT evidence still comes from observational studies and that certainty remains low to very low for several outcomes.

This is important: promising results should not be presented as equivalent to high-quality randomised evidence.

Complications

Potential complications include haemorrhage, thermal injury to nearby structures, visual-field loss, neurological deficit, infection and incomplete ablation.

Worldwide access

LITT requires stereotactic neurosurgery, compatible laser equipment, intraoperative or interventional MRI capability and specialist multidisciplinary expertise.

Availability therefore varies substantially between countries and centres.

The central point

LITT is a less invasive way to destroy a carefully defined epileptogenic target, but “less invasive” does not mean more effective. In mesial temporal epilepsy, open resection generally has higher seizure-freedom rates, while LITT may offer advantages in recovery and morbidity for selected patients.

Sources

Evidence checked: September 2026.