Surgery for malformations of cortical development causing epilepsy.

Area of Science:

• Neuroscience
• Neurology
• Neurosurgery

Background:

• Malformations of cortical development (MCD) are a significant cause of refractory epilepsy in pediatric and adult populations.
• Surgical treatment outcomes for MCD-related epilepsy are challenging to evaluate due to limited and variable reporting in existing literature.

Purpose of the Study:

• To assess the efficacy of surgical interventions for epilepsy caused by malformations of cortical development.
• To analyze the factors contributing to surgical outcomes and identify areas for improvement in presurgical evaluation and surgical strategies.

Main Methods:

• Review of published literature on surgical treatment of malformations of cortical development (MCD) and epilepsy.
• Analysis of seizure-free outcomes at a minimum 2-year follow-up.
• Examination of the relationship between MCD subtypes, epileptogenic zone characteristics, and surgical success.

Main Results:

• Approximately 40% of surgically treated MCD cases achieve seizure freedom, a rate comparable to focal cortical dysplasia (FCD) but lower than hippocampal sclerosis.
• The epileptogenic zone in MCD may be spatially and temporally distributed, potentially extending beyond visualized malformations.
• Certain MCD types, like polymicrogyria and schizencephaly, may have visualized abnormalities that are not the primary drivers of seizures.

Conclusions:

• Current surgical outcomes for MCD-related epilepsy are suboptimal, likely due to the complex biology and distributed nature of the epileptogenic zone.
• Improved presurgical evaluation techniques and standardized reporting, potentially via a central registry, are crucial for enhancing surgical planning and patient selection.
• Refined surgical strategies tailored to specific MCD subtypes and epileptogenic zone understanding are needed to improve seizure control.