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Published on: August 16, 2024
Pediatric frontal lobe epilepsy: white matter abnormalities and cognitive impairment
H M H Braakman1, M J Vaessen, J F A Jansen
1Department of Neurology, Maastricht University Medical Centre, Maastricht, the Netherlands; Research School for Mental Health & Neuroscience, Maastricht University Medical Centre, Maastricht, the Netherlands; Department of Research and Development, Epilepsy Centre Kempenhaeghe, Heeze, the Netherlands.
Insights
Children with frontal lobe epilepsy (FLE) show white matter abnormalities, particularly in posterior regions. Impaired cognition in these children is linked to more severe white matter differences, suggesting developmental issues.
Area of Science:
- Neuroscience
- Pediatric Neurology
- Radiology
Background:
- Cognitive impairment is common in children with frontal lobe epilepsy (FLE).
- The underlying causes of cognitive deficits in FLE are not well understood.
- Diffusion tensor imaging (DTI) can assess white matter integrity.
Purpose of the Study:
- To investigate cerebral white matter properties in children with FLE using DTI.
- To explore the association between white matter characteristics and cognitive function in pediatric FLE.
- To compare white matter integrity between children with FLE and healthy controls.
Main Methods:
- Thirty children (aged 8-13) with FLE and 39 age-matched healthy controls underwent neuropsychological testing and brain MRI.
- Structural and diffusion-weighted MRI scans were acquired for all participants.
- Patients were categorized as cognitively impaired or unimpaired for comparative analysis.
Main Results:
- Children with FLE exhibited reduced diffusion coefficients and fractional anisotropy (FA) in posterior white matter tracts compared to controls.
- A reduced FA was observed in the right frontal-occipital white matter tract.
- Cognitively impaired FLE patients showed increased occipital lobe FA and reduced FA in tracts connecting frontal to occipital/subcortical regions, with smaller tract volumes.
Conclusions:
- White matter abnormalities in pediatric FLE are not restricted to the seizure focus, often affecting posterior regions.
- Cognitively impaired children with FLE display more significant white matter alterations.
- These findings suggest disturbed white matter maturation may contribute to cognitive impairment in FLE.
Objectives:
Cognitive impairment is frequent in children with frontal lobe epilepsy (FLE). Its etiology remains unknown. With diffusion tensor imaging, we have studied cerebral white matter properties and associations with cognitive functioning in children with FLE and healthy controls.
Methods:
Thirty children aged 8-13 years with FLE of unknown cause and 39 healthy age-matched controls underwent neuropsychological assessment, structural and diffusion-weighted brain MRI. Patients were grouped as cognitively impaired or unimpaired, and their white matter diffusion properties were compared with the controls.
Results:
Children with FLE had reduced apparent diffusion coefficients in various posteriorly located tract bundles, a reduced fractional anisotropy (FA) of the white matter tract between the right frontal and right occipital lobe, and smaller volumes of several collections of interlobar bundle tracts, compared with controls. The cognitively impaired patient group demonstrated significant increases in FA of the white matter of both occipital lobes, a reduced FA of white matter tract bundles between the right frontal and both left occipital lobe and subcortical white matter area, and smaller volumes of two collections of tract bundles connecting the frontal lobe with the temporal and parietal lobes, compared with controls.
Conclusions:
Children with FLE had white matter abnormalities mainly in posterior brain regions, not confined to the area of the seizure focus. Cognitively impaired children with FLE showed the most pronounced white matter abnormalities. These possibly reflect disturbed maturation and might be part of the etiology of the cognitive impairment.
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