Multidisciplinary analysis of patients with extratemporal complex partial seizures. I. Intertest agreement

Area of Science:

• Neurology
• Neuroscience
• Epileptology

Background:

• Epilepsy diagnosis often relies on identifying the seizure's origin.
• Extratemporal epilepsies present diagnostic challenges compared to temporal lobe epilepsy.
• Accurate localization is crucial for effective treatment strategies.

Purpose of the Study:

• To investigate the utility of neuropsychological tests and fluorodeoxyglucose-positron emission tomography (FDG-PET) in localizing extratemporal epilepsy origins.
• To compare the diagnostic accuracy of these methods with electroclinical findings.

Main Methods:

• Hypothesized extratemporal seizure origins in 15 patients using surface electroencephalography (EEG) and video recordings.
• Administered neuropsychological tests and performed computed tomography (CT), magnetic resonance imaging (MRI), and FDG-PET scans.
• Correlated findings from tests and imaging with hypothesized ictal onset zones.

Main Results:

• Neuropsychological tests revealed abnormalities in 86.6% of patients.
• FDG-PET scans showed abnormalities in 73% of patients.
• Neuropsychological tests and FDG-PET correctly localized or lateralized dysfunction to the same sites as electroclinical characteristics in 85% of patients (P < 0.01).
• CT and MRI scans showed limited correlation with ictal origin due to high rates of normal or non-specific findings.

Conclusions:

• Neuropsychological testing and FDG-PET are valuable tools for localizing extratemporal epilepsy.
• These methods demonstrate high concordance with electroclinical data in identifying seizure origins.
• Further validation in larger patient cohorts is recommended.