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Extra-hippocampal grey matter density abnormalities in paediatric mesial temporal sclerosis
Francesca Cormack1, David G Gadian, Faraneh Vargha-Khadem
1Developmental Cognitive Neuroscience Unit, Institute of Child Health, University College London, London WC1N 1EH, UK. f.cormack@ich.ucl.ac.uk
Neuroimage
|July 12, 2005
Summary
Children with temporal lobe epilepsy show reduced grey matter in the hippocampus and other brain regions. These abnormalities may stem from recurrent seizures disrupting brain development and hippocampal input.
Area of Science:
- Neuroscience
- Pediatric Neurology
- Radiology
Background:
- Temporal lobe epilepsy (TLE) with mesial temporal sclerosis (MTS) is a common epilepsy syndrome in children.
- Understanding the neuroanatomical changes associated with pediatric TLE-MTS is crucial for diagnosis and treatment.
- Previous studies have focused on hippocampal changes, but extra-temporal alterations are less understood.
Purpose of the Study:
- To identify and characterize grey matter density abnormalities in children diagnosed with TLE and MTS.
- To investigate the spatial distribution of these abnormalities in relation to the seizure focus.
- To explore potential correlations between grey matter changes and known neurodevelopmental impacts of epilepsy.
Main Methods:
- Acquisition of T1-weighted 3D magnetic resonance imaging (MRI) datasets from pediatric patients with TLE (left/right sided) and age-matched healthy controls.
- Utilized voxel-based morphometry (VBM) for automated, objective comparison of grey matter density between groups.
- Analyzed volumetric differences in grey matter across the entire brain, focusing on temporal and extra-temporal regions.
Main Results:
- Significant grey matter density reductions were observed ipsilateral to the seizure focus, extending beyond the hippocampus to the lateral temporal lobe.
- Extra-temporal regions, including the thalamus, posterior cingulate cortex, and cerebellum, also exhibited reduced grey matter density.
- Bilateral grey matter differences were noted in the frontal and parietal opercular cortices and lateral temporal regions, suggesting widespread network involvement.
Conclusions:
- Pediatric TLE with MTS is associated with widespread grey matter density reductions, not confined to the mesial temporal structures.
- These observed abnormalities align with the known connectivity patterns of the hippocampus, indicating network-level disruption.
- Recurrent seizures and altered functional input from the sclerotic hippocampus likely contribute to impaired cortical development and grey matter loss in affected children.