Abstract
Objective: Investigate areas of correlation between gray matter volumes by MRI and interictal EEG source maps in subtypes of mesial temporal lobe epilepsy (MTLE).Method: 71 patients and 36 controls underwent 3T MRI and and routine EEG was performed. Voxel-based morphometry (VBM) was used for gray matter analysis and analysis of interictal discharge sources for quantitative EEG. Voxel-wise correlation analysis was conducted between the gray matter and EEG source maps in MTLE subtypes.Results: The claustrum was the main structure involved in the individual source analysis. Twelve patients had bilateral HA, VBM showed bilateral hippocampal. Twenty-one patients had right HA, VBM showed right hippocampal and thalamic atrophy and negatively correlated involving the right inferior frontal gyrus and insula. Twenty-two patients had left HA, VBM showed left hippocampal atrophy and negatively correlated involving the left temporal lobe and insula. Sixteen patients had MTLE without HA, VBM showed middle cingulate gyrus atrophy and were negatively correlated involving extra-temporal regions, the main one located in postcentral gyrus.Conclusions: Negative correlations between gray matter volumes and EEG source imaging. Neuroanatomical generators of interictal discharges are heterogeneous and vary according to MTLE subtype.Significance: These findings suggest different pathophysiological mechanisms among patients with different subtypes of MTLE.
Highlights
Interictal spikes in the EEG of patients with mesial temporal lobe epilepsy (MTLE) critically contribute to the diagnosis and lateralization of the epileptogenic zone [1, 2]
Sixteen patients had MTLE without HA, Voxel-based morphometry (VBM) showed middle cingulate gyrus atrophy and were negatively correlated involving extra-temporal regions, the main one located in postcentral gyrus
Neuroanatomical generators of interictal discharges are heterogeneous and vary according to MTLE subtype. These findings suggest different pathophysiological mechanisms among patients with different subtypes of MTLE
Summary
Interictal spikes in the EEG of patients with mesial temporal lobe epilepsy (MTLE) critically contribute to the diagnosis and lateralization of the epileptogenic zone [1, 2]. The second showed widespread cortical thinning when compared to the fisrt one: in the left hemisphere involving cingulate, supramarginal, occipitotemporal an parahippocampal gyri, precuneus and parietal lobule; in the right hemisphere, frontomedial, central and basal gyri and precuneus was envolved. These findings suggest that a large cortical network in this group is affected and showed that the distribution of interictal spikes was associated with widespread cortical thinning beyond the mesiotemporal region [7, 8]
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