Laser ablation for mesial temporal epilepsy: a multi-site, single institutional series

Area of Science:

• Neurosurgery
• Epileptology
• Medical Technology

Background:

• Laser interstitial thermal therapy (LiTT) is an emerging surgical option for mesial temporal lobe epilepsy (MTLE).
• Understanding ablation volumes and seizure outcomes is crucial for optimizing LiTT application.

Purpose of the Study:

• To evaluate mesial temporal lobe ablation volumes and seizure outcomes following LiTT.
• To investigate the relationship between ablation extent and treatment efficacy in MTLE patients.

Main Methods:

• Retrospective review of 23 MTLE patients treated with LiTT between 2011-2015.
• Measurement of hippocampal and amygdala ablation volumes using MRI and FreeSurfer.
• Comparison of seizure outcomes and correlation analysis with ablation parameters.

Main Results:

• 48% of patients achieved seizure freedom at a median follow-up of 34 months.
• No significant correlation was found between ablation volume and seizure freedom (p=0.69).
• Visual field deficits occurred in 67% of tested patients; no difference in ablation volume was noted between those with and without deficits.

Conclusions:

• Ablation volume in LiTT for MTLE does not significantly correlate with seizure outcomes.
• Visual field deficits are a common side effect, comparable to open temporal lobectomy.
• Further research is needed to clarify the role of amygdalohippocampal ablation in LiTT for epilepsy.