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Cortical development and focal cortical dysplasia.
Marina Bentivoglio1, Laura Tassi, Emanuel Pech
1Department of Morphological and Biomedical Sciences, University of Verona, Verona, Italy.
Epileptic Disorders : International Epilepsy Journal with Videotape
|November 18, 2003
Summary
Cortical development involves precise neuronal migration, crucial for brain organization. Disruptions in this process can lead to focal cortical dysplasia (FCD), now classified into three subtypes based on neuropathological findings.
Area of Science:
- Neuroscience
- Developmental Biology
- Neuropathology
Background:
- Cortical development (corticogenesis) is a complex process involving ordered temporospatial steps.
- Key events include cell proliferation, migration, differentiation, maturation, and programmed cell death.
- Disruptions in these developmental processes can result in focal cortical dysplasia (FCD).
Purpose of the Study:
- To present a survey of cortical development, emphasizing neuronal migration and its alterations.
- To introduce a novel neuropathological classification of focal cortical dysplasia (FCD) based on revision of cases with intractable epilepsy.
Main Methods:
- Review of established knowledge on corticogenesis and neuronal migration.
- Neuropathological revision of FCD cases associated with intractable epilepsy.
- Analysis of electroclinical, neuroimaging, and postsurgical outcome data.
Main Results:
- Cortical development involves radial migration of pyramidal cells and tangential migration of interneurons.
- Focal cortical dysplasia (FCD) represents a spectrum of maldevelopmental alterations.
- A new classification identifies three FCD subgroups: architectural, cytoarchitectural (with giant neurons), and Taylor-type (with giant, dysmorphic, ectopic neurons, and balloon cells).
Conclusions:
- Neuronal migration is a critical determinant of cortical organization.
- The novel FCD classification provides a framework for understanding these developmental disorders.
- This classification is supported by clinical, imaging, and surgical outcome data, aiding in patient management.