Gamma Knife radiosurgery relative to microsurgery: epilepsy

Area of Science:

• Neurosurgery
• Neurology
• Radiation Oncology

Background:

• Medically intractable epilepsy poses significant challenges.
• Microsurgery for epilepsy, particularly temporal resections, offers high seizure-free rates (65-70%) with low morbidity (<5%) and mortality (<1%).
• Open surgery allows for electrocorticography, functional mapping, and precise resection but involves significant invasiveness.

Purpose of the Study:

• To investigate the efficacy and safety of Gamma Knife radiosurgery (GKRS) for medically intractable epilepsy.
• To compare GKRS outcomes with established microsurgical treatments.
• To explore the potential of GKRS in epilepsy associated with various pathologies.

Main Methods:

• Review of preliminary evidence from series of patients treated with GKRS for epilepsy.
• Analysis of outcomes in patients with epilepsy secondary to arteriovenous malformations, tumors, or cavernous angiomas.
• Evaluation of GKRS in patients with mesial temporal sclerosis and hypothalamic hamartomas.

Main Results:

• GKRS has achieved results comparable to surgery in epilepsy associated with vascular malformations and tumors.
• In 15 patients with mesial temporal sclerosis, 14 achieved seizure freedom with minimal morbidity.
• Six of eight patients with hypothalamic hamartoma-associated epilepsy showed seizure improvement with no major morbidity.

Conclusions:

• Gamma Knife radiosurgery is an effective and safe treatment option for a majority of patients with intractable epilepsy.
• GKRS offers a less invasive alternative to open surgery.
• Emerging evidence suggests potential for seizure control without complete ablation of the epileptogenic target.