Epilepsy Surgery
Epilepsy surgery encompasses a range of neurosurgical procedures designed to control or cure drug-resistant seizures by removing, disconnecting, or ablating the brain region responsible for generating seizures (the epileptogenic zone). When successful, epilepsy surgery can be life-changing, freeing patients from years of uncontrolled seizures and enabling them to return to driving, employment, and independent living.
When this procedure may be recommended
- Drug-resistant focal epilepsy confirmed by comprehensive presurgical evaluation.
- Epilepsy caused by an identifiable structural lesion (mesial temporal sclerosis, cortical dysplasia, cavernoma, low-grade tumour).
- Seizures causing significant disability, injury risk, or cognitive decline despite optimal medical therapy.
- Failed response to at least two appropriately chosen anti-seizure medications.
Who may be a candidate
Candidates must have focal (localised) epilepsy with a clearly identified seizure onset zone confirmed by video-EEG, neuroimaging, and neuropsychological testing. Patients with multifocal or generalised epilepsy may not be suitable for resective surgery but may benefit from neuromodulation.
Advanced medical implant technology (no text). Alternatives to surgery
- Continued anti-seizure medication optimisation.
- Vagus nerve stimulation (VNS) — an implanted nerve stimulator.
- Responsive neurostimulation (RNS) — a closed-loop brain stimulator.
- Ketogenic diet (particularly in paediatric patients).
- MRI-guided laser interstitial thermal therapy (LITT) for small deep lesions.
What to expect
- Presurgical Evaluation: Comprehensive workup including prolonged video-EEG monitoring, high-resolution 3T MRI, PET scan, neuropsychological testing, and Wada test or fMRI.
- Invasive Monitoring (if needed): Stereo-EEG electrodes are implanted to precisely map the seizure onset zone when non-invasive data is inconclusive.
- Surgical Planning Conference: The multidisciplinary epilepsy team reviews all data to define the resection boundaries.
- Resection: The epileptogenic zone is surgically removed via craniotomy. Common operations include anterior temporal lobectomy, selective amygdalohippocampectomy, or lesionectomy.
- Intraoperative Mapping: Cortical stimulation mapping is performed to preserve language and motor function when the seizure focus is near eloquent cortex.
- Closure: Standard craniotomy closure with bone flap replacement and wound closure.
Technology and imaging
Uses stereo-EEG robotics, intraoperative neuronavigation, cortical and subcortical stimulation mapping, and electrocorticography (ECoG) to guide resection margins.
High-precision diagnostic imaging visualization. 
Clinical Zeiss/Leica operating microscope setup. Hospital stay
Typically 4 to 7 nights in hospital, including ICU monitoring.
Recovery milestones
- Days 1-2: ICU monitoring with close neurological and seizure surveillance.
- Days 3-7: Ward mobilisation, speech and neuropsychological assessments, wound care.
- Weeks 1-6: Home recovery with gradual activity increase. Anti-seizure medications are continued initially.
- Months 3-12: Gradual supervised medication tapering if seizure-free. Driving assessment at 12 months seizure-free (per Australian regulations).
Post-operative mobilization and recovery milestones. Risks and complications
- Visual field deficit (superior quadrantanopia) after temporal lobe surgery — common but usually not disabling.
- Memory decline, particularly verbal memory after dominant temporal lobe surgery.
- Transient speech or language difficulties.
- Standard craniotomy risks: infection, bleeding, stroke (1% to 3%).
- Seizure recurrence despite surgery (20% to 40% in temporal lobe epilepsy).
Frequently asked questions
What is the success rate of epilepsy surgery?
Anterior temporal lobectomy for mesial temporal sclerosis achieves seizure freedom in approximately 60% to 80% of patients. Lesional epilepsy surgery (removing a visible cause such as a cavernoma or tumour) has even higher success rates, often exceeding 80%.
Can I stop my medications after epilepsy surgery?
Medication tapering is considered after a sustained period of seizure freedom (usually 12 to 24 months). It is done gradually under close medical supervision. Some patients can eventually stop all anti-seizure medications, while others may continue a reduced regimen.