Malformations of cortical development: Embryology and epilepsy

Area of Science:

• Neuroscience
• Developmental Biology
• Epileptology

Background:

• Malformations of cortical development (MCDs) are a significant cause of focal epilepsy, affecting approximately 14% of patients.
• Understanding the intricate processes of normal neocortical development—proliferation, migration, and organization—is crucial for deciphering epileptogenesis in MCDs.

Purpose of the Study:

• To correlate normal human neocortical embryology with common MCDs presenting in epilepsy.
• To elucidate the mechanisms of epileptogenesis by understanding developmental errors.
• To provide insights into the classification, diagnosis, and management of cortical malformations.

Main Methods:

• Review of current literature on neocortical development and MCDs.
• Correlation of embryological stages with specific MCDs: focal cortical dysplasia, heterotopia, and polymicrogyria.
• Integration of magnetic resonance imaging (MRI) findings from a tertiary epilepsy center.

Main Results:

• Focal cortical dysplasia, heterotopia, and polymicrogyria are the most prevalent MCDs associated with epilepsy.
• Imaging findings are presented to discriminate between these malformations.
• The study highlights the clinical implications of MCD classification for patient workup and treatment.

Conclusions:

• A comprehensive understanding of cortical development is essential for diagnosing and managing epilepsy secondary to MCDs.
• Integrating embryological knowledge with imaging data improves the classification and clinical approach to cortical malformations.
• This review provides a framework for understanding the link between developmental errors and epilepsy, guiding future research and clinical practice.