Neurodevelopmental disruption in early-onset temporal lobe epilepsy: evidence from a voxel-based morphometry study

Area of Science:

• Neuroscience
• Developmental Neurology
• Pediatric Epilepsy

Background:

• Childhood epilepsy, particularly temporal lobe epilepsy (TLE), is linked to impaired brain development and cognitive deficits.
• The timing of epilepsy onset may significantly influence its impact on neurodevelopmental trajectories.

Purpose of the Study:

• To investigate whether earlier onset of temporal lobe epilepsy (TLE) negatively impacts distant brain structures compared to later onset.
• To explore the neurodevelopmental consequences of early-onset TLE using advanced neuroimaging techniques.

Main Methods:

• Quantitative magnetic resonance imaging (MRI) was employed to assess brain structure.
• Voxel-based morphometry (VBM) was utilized to compare gray matter volume between early-onset (≤14 years) and late-onset (>15 years) TLE patient groups.
• One hundred ten patients with TLE were categorized into early (N=58) and late (N=52) onset groups.

Main Results:

• Voxel-based morphometry revealed significant onset-dependent gray matter abnormalities, primarily in frontal brain regions.
• Patients with early-onset TLE exhibited a gray matter excess in these frontal regions, an atypical finding for TLE.
• This gray matter excess is interpreted within a neurodevelopmental framework as indicative of disrupted development.

Conclusions:

• Early-onset TLE is associated with secondary neurodevelopmental disruptions in distant brain regions, particularly the frontal lobes.
• Quantitative MRI is valuable for detecting subtle abnormalities in focal TLE.
• Emphasizes the critical importance of early and effective seizure management in children with intractable TLE to mitigate long-term neurodevelopmental effects.