Epilepsy surgery in MRI-negative epilepsies.

Area of Science:

• Neurology
• Neurosurgery
• Medical Imaging

Background:

• Epilepsy surgery is a treatment option for drug-resistant epilepsy.
• MRI-negative epilepsy presents diagnostic challenges.
• Identifying the seizure onset zone is crucial for surgical success.

Purpose of the Study:

• To review strategies for MRI-negative epilepsy surgery.
• To evaluate the role of advanced MRI and functional imaging.
• To correlate imaging findings with postsurgical outcomes.

Main Methods:

• Review of postacquisition MRI data processing techniques.
• Analysis of functional imaging modalities including PET, SPECT, and MEG.
• Integration of statistical parametric mapping and PET-MRI coregistration.
• Correlation with intracranial EEG localization.

Main Results:

• Advanced MRI processing identified previously undetected abnormalities.
• Resection of identified abnormalities led to excellent seizure control.
• Functional imaging, particularly PET and SPECT with SPM, improved evaluation.
• PET-MRI coregistration demonstrated superiority over conventional PET.
• Magnetoencephalography (MEG) showed promise, with single clusters correlating with intracranial EEG and good surgical outcomes.

Conclusions:

• Advanced MRI techniques are vital for detecting subtle lesions in MRI-negative epilepsy.
• Functional imaging (PET, SPECT, MEG) enhances seizure onset zone localization.
• Intracranial EEG confirmation is essential for surgical planning.
• Successful MRI-negative epilepsy surgery relies on integrating advanced imaging and EEG data.