Epilepsy Surgery Options: Evaluation, Procedures, and Questions to Ask

Understand when epilepsy surgery options may help, what each evaluation test is meant to answer, and how teams compare resection, ablation, disconnection, and implanted stimulation.

Patient and family discussing epilepsy surgery options with a neurologist and neurosurgeon

Learning about epilepsy surgery options can make families think the team has already decided on surgery. It has not. A referral starts a structured review of the diagnosis, prior treatment, seizure-onset network, possible benefits, and possible harms. The review can improve the care plan even when the team recommends no procedure.

An evaluation is a fact-finding process

The International League Against Epilepsy definition of drug-resistant epilepsy uses a person’s response to medication. It means that adequate trials of two tolerated, appropriately chosen, and correctly used antiseizure medication schedules did not achieve sustained seizure freedom. A separate expert consensus on referral recommends offering evaluation as soon as the care team confirms drug resistance for a potential candidate up to age 70. For someone older than 70, it recommends considering referral when the team finds no condition that rules out surgery. The team judges suitability case by case, and referral does not guarantee surgery.

Epilepsy surgery is an umbrella term. Some procedures remove, destroy, or disconnect tissue and may aim for seizure freedom in carefully selected situations. By contrast, implanted stimulation usually aims to reduce seizure burden over time. The right comparison is personal: expected benefit, functional risk, recovery, follow-up, and the person's goals all matter.

Referral is not consent

Evaluation opens a comparison of options. Still, completing it does not commit anyone to an operation or implanted device.

No single test decides

Teams look for agreement across seizure history, video EEG, imaging, and functional assessment. For example, an MRI finding alone is not the whole decision.

Goals differ by option

Selected resection or ablation may aim for seizure freedom. By contrast, stimulation and some disconnection procedures more often aim to reduce disabling seizures.

What this means for you

  • If two appropriate medication schedules have not produced sustained seizure freedom, ask whether a comprehensive epilepsy center evaluation is appropriate. Referral can also be considered earlier for some structural lesions or syndromes.
  • In addition, ask what question each proposed test will answer. Video electroencephalography (video EEG), epilepsy-protocol magnetic resonance imaging (MRI), neuropsychological testing, functional mapping, and invasive EEG are not interchangeable.
  • Request estimates for the specific person and procedure: the chance of seizure freedom or meaningful reduction, the functions at risk, recovery needs, and alternatives including no procedure.

How epilepsy surgery options differ

These epilepsy surgery options are broad families, not a menu to choose from alone. However, eligibility, technique, expected outcome, and risk depend on seizure type, the target, age, other health conditions, and local regulatory approvals.

Resection

What it does: Removes a defined area that the team believes generates seizures. Common terms families may hear include lesionectomy and temporal lobectomy, depending on the target.

Usual goal: Seizure freedom may be the goal in selected focal epilepsy when the team can remove the seizure-generating area while keeping functional risk acceptable.

Key tradeoffs: It is open brain surgery. Recovery and the risks to language, memory, vision, movement, mood, or other functions depend strongly on location and extent.

Laser interstitial thermal therapy

What it does: Uses a stereotactically placed probe to heat and destroy a selected target through a smaller opening than an open resection.

Usual goal: The team may consider seizure freedom a goal for a well-localized target that it can safely reach and treat.

Key tradeoffs: However, it still permanently treats brain tissue and requires precise localization. The target, heat spread, seizure recurrence, and possibility of another procedure all belong in the discussion.

Disconnection surgery

What it does: Interrupts pathways that allow seizures to spread. Corpus callosotomy, hemispherotomy, and hemispherectomy are different terms families may hear in selected situations.

Usual goal: For example, the goal may be fewer dangerous drop attacks or broader seizure control. The syndrome and the part of the network that the procedure disconnects shape that goal.

Key tradeoffs: Some seizures may continue. Possible changes in movement, coordination, language, behavior, or other functions differ greatly by procedure and the person's starting abilities.

Implanted stimulation

What it does: Vagus nerve stimulation (VNS), responsive neurostimulation (RNS), and deep brain stimulation (DBS) deliver electrical stimulation through different targets and programming strategies; they do not remove a seizure focus.

Usual goal: By contrast, these devices usually aim for a meaningful reduction in seizure burden over time. A team may consider them when removal or ablation does not suit the person, the person does not prefer it, or it has not fully controlled seizures.

Key tradeoffs: Benefits may build gradually. Implant risks, stimulation effects, programming visits, hardware or battery procedures, MRI rules, and eligibility differ by device.

The four questions an evaluation needs to answer

Instead of following a fixed order, these evidence lanes often develop in parallel. The team looks for agreement across them and names what remains uncertain.

Are the events epileptic, and is the epilepsy drug resistant?

The center reviews seizure descriptions or videos, medication choices and doses, side effects, prior records, and whether every event is epileptic. The first question is whether the diagnosis and drug-resistance history are secure.

Where does the seizure-onset network appear to be?

Video EEG and epilepsy-protocol MRI are common starting points. For example, teams may add positron emission tomography (PET), single-photon emission computed tomography (SPECT), magnetoencephalography (MEG), or repeat monitoring when the initial evidence is incomplete or does not agree.

Which functions could treatment affect?

A neuropsychological assessment tests memory, thinking, mood, and other skills. Selected language, movement, or sensory mapping can also help estimate what treatment could change. The team may discuss stereoelectroencephalography (stereo-EEG) when other tests cannot answer a focused question about where seizures begin.

Which option best matches the person's goals?

Epilepsy specialists, neurosurgeons, imaging experts, neuropsychologists, and other team members compare how well the findings agree, likely outcomes, alternatives, and the person's priorities. The recommendation may be a procedure, more testing, another therapy, or no surgery.

Tests that help compare epilepsy surgery options

Video EEG. Records brain electrical activity together with video, often long enough to capture typical events. It can help confirm which events are epileptic and suggest where seizures begin, but it rarely answers every localization question by itself.

Epilepsy-protocol MRI. Imaging experts use specific sequences and review to look for subtle structural causes. However, a normal or nonlocalizing scan does not by itself rule out focal epilepsy or referral for evaluation.

Neuropsychological testing and functional mapping. Establish a baseline and help estimate how treatment could affect memory, language, movement, vision, or other functions. For a specific question, the team may consider functional MRI or, in selected cases, a Wada test.

PET, SPECT, and MEG. May add metabolic, blood-flow, or magnetic-source information when the history, EEG, and MRI are incomplete or do not agree. Not everyone needs each test.

Invasive EEG. Stereo-EEG or, in selected settings, subdural recordings can sample suspected brain areas when a focused uncertainty remains and the answer could change treatment. These are invasive procedures, not routine tests for everyone.

Compare potential benefits, risks, and burdens

When comparing epilepsy surgery options, the decision is not 'surgery versus no risk.' Instead, a useful conference compares a proposed procedure with the risks and burdens of ongoing seizures and the other realistic options.

Potential benefits to ask about

  • Chance of seizure freedom or a meaningful reduction in the person's most disabling seizures.
  • Possible reduction in injuries, emergency care, rescue treatment, or recovery time after seizures.
  • Possible gains in participation, sleep, learning, development, independence, mood, or quality of life.
  • Diagnostic clarity and a more focused care plan, even if evaluation ends without a procedure.

Possible harms and burdens to ask about

  • Infection, bleeding, anesthesia complications, stroke, neurological change, or need for another procedure.
  • Possible effects on memory, language, vision, movement, sensation, mood, behavior, or thinking.
  • Incomplete seizure control, seizure recurrence, rehabilitation needs, and continued safety restrictions.
  • For devices: stimulation effects, programming, hardware complications, battery changes, and imaging restrictions.
  • Time in hospital, travel, time away from work or school, caregiving, cost, and access to long-term follow-up.

Ask the team to separate estimates of seizure freedom from estimates of seizure reduction. Also ask what evidence supports each estimate. A general success rate from another diagnosis, age group, or procedure may not apply.

People commonly continue antiseizure medication after a procedure. The treating team should make changes only through a plan tailored to that person. Never reduce or stop medication because of this page.

From referral to long-term follow-up

A typical path through an epilepsy surgery evaluation

There is no universal schedule. Tests can overlap, and the team may need to repeat some of them. Shared decision-making should continue throughout.

  1. Step 1 Referral and records The center gathers medication trials, seizure descriptions or videos, prior EEG and imaging, injuries, development or cognition, mental health history, and the person's goals.
  2. Step 2 Phase 1 noninvasive evaluation Video EEG, epilepsy-protocol MRI, and neuropsychological assessment are common. Teams add other imaging or functional studies only when they answer a defined question.
  3. Step 3 First multidisciplinary review The team asks whether the evidence supports the diagnosis, whether it localizes a treatable network, and whether the existing information suffices to compare options.
  4. Step 4 Additional mapping when needed If uncertainty remains and resolving it could change treatment, the team may discuss stereo-EEG or other invasive mapping. Not everyone needs this phase.
  5. Step 5 Recommendation and shared decision The team explains the proposed option, alternatives, expected outcomes, material risks, recovery, and what could happen without the procedure. A second opinion remains reasonable.
  6. Step 6 Procedure, recovery, and ongoing care Follow-up tracks seizures, medication, cognition, mood, function, rehabilitation, and device programming when relevant. Outcomes can change over months or years.

Possible result: A procedure, more testing, another therapy, or no surgery. The person and team can revisit the decision when goals or evidence change.

Questions families ask about epilepsy surgery options

ILAE expert consensus recommends offering referral as soon as a care team establishes drug-resistant epilepsy for people up to age 70 who could be candidates. For people older than 70, it recommends considering referral when there is no surgical contraindication. In addition, some lesions or syndromes may prompt an earlier conversation. Suitability and timing still require individualized clinical judgment.

No. Evaluation can confirm a different diagnosis, improve medication or diet planning, identify a device option, lead to more observation, or conclude that no procedure offers a favorable balance of benefit and risk.

Yes. A normal or nonlocalizing MRI does not by itself rule out referral. Specialized EEG, imaging, neuropsychological testing, and sometimes invasive recording may help. However, evaluation does not guarantee that the team will find a safe target.

Stereo-EEG uses temporary depth electrodes to record from selected brain regions. A center may propose it when a focused uncertainty remains after noninvasive testing and the answer could change treatment. Many evaluations do not require it.

Procedures, devices, and next steps

No. It uses a smaller opening, but it still permanently treats brain tissue. Safety and effectiveness depend on target size and location, heat spread, localization confidence, and the alternative that the team is comparing.

No. They stimulate different targets, use different programming approaches, and have different eligibility, evidence, follow-up, and imaging considerations. A center should explain why one device fits the treatment goal better than another.

Sometimes a team may discuss a gradual reduction later, but many people continue medication for a substantial period or indefinitely. The timing depends on the procedure, seizure outcome, EEG findings, diagnosis, and individual risk. Never taper without the treating team's plan.

Yes, especially when tests disagree, more than one procedure is plausible, the predicted functional risk is substantial, or the person wants another center to review the evidence. Ask how the centers can transfer records and imaging.

Look for a comprehensive epilepsy center with the monitoring, imaging, neuropsychology, neurosurgery, rehabilitation, mental health, and long-term follow-up expertise needed for the person's age and condition.

Glossary

Video electroencephalography records brain electrical activity together with video so a team can compare clinical events with EEG changes.

Magnetic resonance imaging performed with sequences and expert review intended to look for structural findings associated with epilepsy.

Failure of adequate trials of two tolerated, appropriately chosen, and correctly used antiseizure medication schedules to achieve sustained seizure freedom.

Agreement among different parts of the evaluation, such as seizure history, EEG, imaging, and neuropsychological findings. Agreement can increase confidence but does not remove uncertainty.

The brain area or network where recordings suggest seizures begin. It is one part of defining what tissue might need treatment.

Surgery that removes brain tissue the team judges likely to generate seizures when it believes removal carries an acceptable functional risk.

A stereotactic procedure, which clinicians often shorten to LITT, that uses heat from a laser probe to destroy a selected target.

A procedure that interrupts pathways through which seizures spread rather than simply removing a small seizure focus.

Treatment that delivers electrical stimulation to alter seizure networks. VNS, RNS, and DBS differ in target, programming, eligibility, and evidence.

Specialized centers use temporary depth electrodes to record seizures from selected brain regions when noninvasive tests leave a focused localization question.

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The Planned Laser (MRgLITT) vs. Open Surgery Trial

How Centromedian DBS Targeting Is Planned

More research

Sources

Sources checked July 26, 2026. This educational draft has not received independent medical review and is not medical advice.

Prepare to discuss epilepsy surgery options

Before discussing epilepsy surgery options, bring a current medication history, seizure diary or videos when available, prior EEG and imaging reports, and a short list of the outcomes and tradeoffs that matter most to the person and family. The U.S. directory below lists NAEC-accredited centers. Outside the United States, use the ILAE national chapters link in Sources to identify country-specific epilepsy resources.

Find a U.S. NAEC-accredited epilepsy center Get plain-language epilepsy updates

Where does the team think seizures begin? Which findings agree, which do not, and what additional test would resolve the uncertainty? Could the suspected network involve more than one area?

For this person and this procedure, what is the estimated chance of seizure freedom, meaningful reduction, no improvement, and later recurrence? Which factors make the estimate more or less certain?

Which language, memory, movement, vision, mood, or behavior changes are plausible? What rehabilitation, school or work planning, medication follow-up, and caregiver support might this person need?