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Epilepsy and malformations of the cerebral cortex
Renzo Guerrini1, Federico Sicca, Lucio Parmeggiani
1Institute of Child Neurology and Psychiatry, University of Pisa, Calambrone, Italy. Renzo.Guerrini@inpe.unipi.it
Epileptic Disorders : International Epilepsy Journal with Videotape
|November 18, 2003
Summary
Malformations of the cerebral cortex (MCC) cause many drug-resistant epilepsies. These brain development disorders include conditions like focal cortical dysplasia and lissencephaly, impacting neuronal growth and organization.
Area of Science:
- Neuroscience
- Developmental Biology
- Genetics
Background:
- Malformations of the cerebral cortex (MCC) are a significant cause of severe epilepsy and developmental delay, accounting for approximately 40% of drug-resistant epilepsy cases.
- MCC classification is based on disruptions in embryological brain development, including neuronal proliferation, migration, and cortical organization.
Purpose of the Study:
- To provide an overview of various Malformations of the Cerebral Cortex (MCC).
- To highlight the association between MCC and epilepsy, developmental delay, and genetic underpinnings.
- To describe the clinical presentation and diagnostic features of specific MCC types.
Main Methods:
- Literature review and synthesis of existing research on MCC.
- Analysis of clinical presentations, imaging findings (MRI), and genetic mutations associated with MCC.
- Categorization of MCC based on embryological origins and affected developmental processes.
Main Results:
- Hemimegalencephaly presents as enlarged dysplastic hemispheres, leading to severe early-onset epileptic encephalopathy or partial epilepsy.
- Focal cortical dysplasia (FCD) shows thickened cortex and simplified gyration on MRI, often causing drug-resistant epilepsy with high remission rates after surgical ablation.
- Tuberous sclerosis (TS), caused by TSC1/TSC2 mutations, frequently involves epilepsy and infantile spasms.
- Bilateral periventricular nodular heterotopia (BPNH), linked to Filamin A mutations, presents with epilepsy in females.
- Lissencephaly (LIS) is characterized by absent convolutions, severe developmental delay, and epilepsy, with XLIS mutations causing classical lissencephaly in males.
- Schizencephaly (cleft brain) and Polymicrogyria exhibit a wide spectrum of clinical manifestations, including partial epilepsy and cognitive impairments.
Conclusions:
- MCC represents a diverse group of brain malformations with significant neurological consequences, particularly epilepsy.
- Understanding the specific type of MCC, its genetic basis, and associated clinical features is crucial for diagnosis and management.
- Further research into the underlying mechanisms and therapeutic strategies for MCC-related epilepsy is warranted.