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Updated: Jun 15, 2026
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Electromagnetic Source Imaging in Presurgical Evaluation of Children with Drug-Resistant Epilepsy
Published on: September 20, 2024
Electrical source imaging for presurgical focus localization in epilepsy patients with normal MRI
Verena Brodbeck1, Laurent Spinelli, Agustina M Lascano
1Functional Brain Mapping Laboratory, 4 Rue Gabrielle-Perret-Gentil, Geneva, Switzerland. verena.brodbeck@unige.ch
Epilepsia
|March 4, 2010
Summary
Electroencephalography source imaging (ESI) successfully identified the seizure focus in 80% of patients with normal MRI scans, leading to improved surgical outcomes for 90% of those treated. This technique aids in epilepsy surgery for magnetic resonance imaging-negative cases.
Area of Science:
- Epileptology
- Neuroimaging
- Neurosurgery
Background:
- Focal epilepsy patients with normal MRI (MRN-E) have poorer surgical outcomes (40-70%) than those with identifiable lesions (60-90%).
- Extratemporal MRN-E patients face the lowest seizure freedom rates (around 50%).
Purpose of the Study:
- To evaluate electroencephalography source imaging (ESI) for identifying the epileptic focus in MRN-E patients.
- To assess ESI's contribution to surgical decision-making in cases with normal MRI findings.
Main Methods:
- ESI was performed on 10 operated epilepsy patients with nonlesional MRI and at least 1-year follow-up.
- Methods included surface/intracranial EEG, MRI, FDG-PET, and SPECT; 8 patients had intracranial monitoring.
Main Results:
- ESI accurately localized the epileptic focus within resection margins in 8 out of 10 patients.
- Nine of the 10 patients achieved favorable postsurgical outcomes.
Conclusions:
- ESI demonstrates significant diagnostic value for MRN-E patients.
- The study supports expanding ESI use in presurgical evaluation for epilepsy when surface EEG shows localized spikes.
