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Network Analysis of the Default Mode Network Using Functional Connectivity MRI in Temporal Lobe Epilepsy
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Brain structure and aging in chronic temporal lobe epilepsy.

Kevin Dabbs1, Tara Becker, Jana Jones

  • 1Department of Neurology, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin 53792, USA.

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Individuals with chronic childhood-onset temporal lobe epilepsy (TLE) show widespread brain abnormalities. While most age-related brain changes are similar to controls, TLE patients experience accelerated ventricular enlargement.

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Area of Science:

  • Neuroimaging
  • Epilepsy Research
  • Developmental Neuroscience

Background:

  • Chronic temporal lobe epilepsy (TLE) originating in childhood or adolescence can impact brain development.
  • Understanding structural brain differences and age-related changes in TLE is crucial for long-term prognosis.

Purpose of the Study:

  • To compare brain structure and age-related changes in individuals with chronic childhood/adolescent onset TLE versus healthy controls.
  • To identify specific brain regions and patterns affected by TLE across the lifespan.

Main Methods:

  • Magnetic resonance imaging (MRI) was used to assess brain structure in 55 TLE patients and 53 healthy controls (ages 14-60).
  • FreeSurfer software analyzed lobar thickness, area, volume, and subcortical/cerebellar structures.
  • Group differences and age-related changes were modeled cross-sectionally.

Main Results:

  • Extensive abnormalities were found in TLE patients, including subcortical structures, cerebellum, and cortical regions.
  • Both groups showed age-related brain changes, but TLE patients exhibited accelerated enlargement of the third and lateral ventricles.
  • Patterns of age-related change were otherwise largely comparable between TLE patients and controls.

Conclusions:

  • Chronic TLE starting in youth leads to significant, widespread neurodevelopmental brain abnormalities.
  • Brain changes in TLE generally follow age-appropriate patterns, with accelerated ventricular expansion being a key exception.
  • These cumulative structural burdens in TLE may have long-term consequences into older age.