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Related Experiment Video

Updated: Sep 21, 2025

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Event-based modeling in temporal lobe epilepsy demonstrates progressive atrophy from cross-sectional data.

Seymour M Lopez1, Leon M Aksman1,2, Neil P Oxtoby3

  • 1Centre for Medical Image Computing, Department of Medical Physics and Biomedical Engineering, University College London, London, UK.

Epilepsia
|June 3, 2022
PubMed
Summary

Researchers mapped the progression of brain changes in mesial temporal lobe epilepsy and hippocampal sclerosis (MTLE-HS) using MRI. This sequence of neuroimaging alterations correlates with epilepsy duration, age at onset, and medication resistance, aiding in disease staging.

Keywords:
MTLEdisease progressionduration of illnessevent-based modelpatient staging

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Area of Science:

  • Neuroimaging
  • Epilepsy Research
  • Brain Morphology

Background:

  • Common epilepsies exhibit characteristic, potentially progressive cortical thinning patterns.
  • Previous studies suggest sequential changes in brain structure in epilepsy.

Purpose of the Study:

  • To investigate the sequential nature of regional morphometric changes in mesial temporal lobe epilepsy and hippocampal sclerosis (MTLE-HS).
  • To correlate these neuroimaging changes with clinical features of MTLE-HS.

Main Methods:

  • Utilized T1-weighted MRI scans from 804 MTLE-HS patients and 1625 controls from the ENIGMA-Epilepsy consortium.
  • Employed an event-based model (EBM) trained on regional brain measures (cortical thickness, surface area, subcortical volumes) with Cohen's d ≥ 0.5.
  • Assessed associations between EBM-derived disease stage and epilepsy duration, age at onset, and antiseizure medicine (ASM) resistance.

Main Results:

  • Identified a sequence of brain changes in MTLE-HS: hippocampal volume reduction/asymmetry, followed by neocortical thinning, thalamus volume reduction, and ventricle enlargement.
  • EBM stage correlated significantly with illness duration (ρ = 0.293), age at onset (ρ = -0.18), and ASM resistance (AUC = 0.59).
  • Associations were primarily driven by early-stage MTLE-HS (EBM Stage 0) with subtle MRI abnormalities.

Conclusions:

  • Reconstructed a cross-sectional MRI-based disease progression model for MTLE-HS, aligning with longitudinal findings.
  • The developed model can stage MTLE-HS patients in new cohorts.
  • This imaging-based staging can help link disease progression to clinical characteristics.