Electroclinical and magnetoencephalographic studies in epilepsy patients with polymicrogyria
Jorge G Burneo1, Martina Bebin, Ruben I Kuzniecky
1Epilepsy Programme, London Health Sciences Center, University of Western Ontario, 339 Windermere Road, London, Ontario, Canada N6A 5A5. jburneo@uwo.ca
Rationale:
Malformations of cortical development (MCDs) are increasingly recognized as important causes of developmental delay, epilepsy, and other neurological disorders. Polymicrogyria, a type of MCD, is characterized by many small microgyria separated by shallow sulci, a slightly thick cortex, neuronal heterotopia and often enlarged ventricles. The present descriptive study analysis the electroclinical and magnetoencephalographic findings of patients with epilepsy and polymicrogyria without schizencephaly.
Methods:
We studied six patients; mean age was 27 years, who had evidence of polymicrogyria in neuroimaging studies. A single equivalent-current dipole (ECD) model was used to estimate the location of epileptiform spike dipole sources. Analysis was performed on selected data segments containing MEG spikes. MEG results were combined with MRI to create magnetic source images (MSI).
Results:
In all cases we present results of MRI, MEG, Video-EEG monitoring, and other functional neuroimaging studies if performed.
Conclusions:
MSI can be used to accurately localize sources of epileptiform discharges. As such MSI can play a role of directly determining the functional epileptogenic significance of abnormalities depicted in imaging.
Insights
Magnetic source imaging (MSI) accurately pinpoints seizure sources in patients with polymicrogyria, a brain malformation. This technique aids in understanding the functional significance of imaging abnormalities in epilepsy.
Area of Science:
- Neuroscience
- Medical Imaging
- Epileptology
Background:
- Malformations of cortical development (MCDs) are significant causes of neurological disorders.
- Polymicrogyria, a type of MCD, involves numerous small gyri and can be associated with epilepsy.
- This study focuses on epilepsy and polymicrogyria without schizencephaly.
Purpose of the Study:
- To analyze electroclinical and magnetoencephalographic findings in patients with epilepsy and polymicrogyria.
- To evaluate the utility of magnetic source imaging (MSI) in localizing epileptiform discharges.
Main Methods:
- Six patients with polymicrogyria on neuroimaging were studied.
- Magnetoencephalography (MEG) spikes were analyzed using an equivalent-current dipole (ECD) model.
- MEG results were combined with MRI to create magnetic source images (MSI).
Main Results:
- Results from MRI, MEG, and Video-EEG monitoring are presented for all cases.
- Functional neuroimaging studies were included where performed.
Conclusions:
- Magnetic source imaging (MSI) effectively localizes the sources of epileptiform discharges.
- MSI can determine the functional epileptogenic significance of imaging abnormalities in polymicrogyria.
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