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Structural connectivity differences in left and right temporal lobe epilepsy.

Pierre Besson1, Vera Dinkelacker2, Romain Valabregue3

  • 1Department of clinical neurophysiology EA 1048, Lille University Hospital, France; In-vivo Imaging Platform, IMPRT, Lille University Hospital, France.

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|May 13, 2014
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Summary
This summary is machine-generated.

Temporal lobe epilepsy (TLE) with hippocampal sclerosis significantly alters brain connectivity. Left TLE shows widespread network disruption, particularly in language areas, while right TLE has more localized effects, impacting global brain networks in both cases.

Keywords:
ConnectivityConnectomeHippocampal sclerosisNetwork based statisticsTemporal lobe epilepsy

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Area of Science:

  • Neuroimaging
  • Epilepsy Research
  • Connectomics

Background:

  • Temporal lobe epilepsy (TLE) with hippocampal sclerosis is increasingly understood to affect extensive brain networks.
  • Previous diffusion-weighted imaging studies identified white matter tract alterations, especially in left TLE, but cortical-subcortical connectivity changes require further investigation.

Purpose of the Study:

  • To investigate whole-brain structural connectivity differences in patients with refractory TLE and unilateral hippocampal sclerosis compared to healthy controls.
  • To characterize the impact of lesion side (left vs. right) on brain network architecture.

Main Methods:

  • Whole-brain probabilistic fiber tracking using MRtrix on 39 TLE patients and 28 controls.
  • Segmentation of 164 cortical and subcortical structures using Freesurfer.
  • Computation of structural connectivity graphs and comparison using permutation tests and Network Based Statistics.

Main Results:

  • Left TLE patients exhibited significant, ipsilaterally lateralized connectivity reductions, affecting the infero-lateral cortex, temporal pole, and perisylvian cortex.
  • Right TLE showed less pronounced focal connectivity loss, primarily in limbic structures and the right temporal cortex.
  • Both left and right TLE impacted diffuse global and interhemispheric connectivity, with left TLE displaying more widespread reduced fractional anisotropy (FA).

Conclusions:

  • Unilateral hippocampal sclerosis in TLE leads to distinct patterns of altered brain connectivity, influencing global network architecture.
  • Left-sided TLE is associated with more profound network disruption, including critical language circuitry, highlighting differential impacts of lesion laterality on cerebral connectivity.