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Cerebral activation in malformations of cortical development
M P Richardson1, M J Koepp, D J Brooks
1Epilepsy Research Group, Institute of Neurology, National Hospital for Neurology and Neurosurgery, London, UK.
Brain : a Journal of Neurology
|July 29, 1998
Summary
Malformations of cortical development (MCD) can affect brain regions involved in cognitive tasks. Even visually normal brain areas may show atypical organization in patients with MCD, impacting surgical planning.
Area of Science:
- Neuroscience
- Developmental Neuroscience
- Epileptology
Background:
- Malformations of cortical development (MCD) are a key cause of epilepsy.
- Prior studies show abnormalities in MCD beyond visible MRI.
- The functional capacity of MCD-affected brain regions is not fully understood.
Purpose of the Study:
- To assess the functional participation of MCD-affected brain regions in cognitive and motor tasks.
- To compare task-related brain activity in MCD patients versus healthy controls.
- To identify atypical cortical organization associated with MCD.
Main Methods:
- Used H2(15)O PET scans during visual attention and motor learning tasks.
- Studied patients with occipital and left frontal lobe MCD.
- Employed statistical parametric mapping for data analysis.
Main Results:
- Eight out of ten MCD patients showed altered blood flow in affected regions during tasks.
- Affected regions included dysplastic cortex, clefts, and heterotopia.
- Five patients exhibited atypical overall activation patterns in MRI-normal cortex.
Conclusions:
- MCD-affected brain regions can participate in cognitive functions.
- Widespread atypical cortical organization is observed in MCD patients.
- Findings have significant implications for surgical planning in MCD cases.