Gamma knife surgery for mesial temporal lobe epilepsy

Area of Science:

• Neurosurgery
• Epileptology
• Radiation Oncology

Background:

• Gamma knife radiosurgery (GKS) precisely targets tissue with minimal damage to surrounding areas.
• Existing GKS epilepsy treatments primarily address lesions; this study explores its use in non-lesional epilepsy.
• Mesial temporal lobe epilepsy (MTLE) is often drug-resistant, necessitating alternative therapeutic approaches.

Purpose of the Study:

• To evaluate the efficacy and safety of GKS for treating drug-resistant MTLE in patients without space-occupying lesions.
• To determine the seizure reduction and potential side effects associated with GKS in this patient population.

Main Methods:

• Twenty-five patients with drug-resistant MTLE were selected for the study.
• Sixteen patients underwent GKS targeting amygdalohippocampal structures, with over 24 months follow-up.
• Standard preoperative evaluations for MTLE microsurgery were performed prior to GKS.

Main Results:

• 81% (13/16) of patients became seizure-free, with 2 additional patients showing improvement.
• Seizure cessation occurred at a median of 10.5 months post-GKS; aura cessation at 15.5 months.
• No permanent neurological deficits, morbidity, or mortality were observed; three patients had transient visual field deficits.

Conclusions:

• GKS demonstrates short- to middle-term efficacy and safety for treating MTLE without space-occupying lesions.
• GKS may offer a less invasive and lower morbidity alternative to traditional epilepsy surgery.
• Long-term follow-up is necessary to fully ascertain the durability of GKS treatment for MTLE.