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Bilateral limbic diffusion abnormalities in unilateral temporal lobe epilepsy.

Luis Concha1, Christian Beaulieu, Donald W Gross

  • 1Department of Biomedical Engineering, University of Alberta, Edmonton, Alberta, Canada.

Annals of Neurology
|November 25, 2004
PubMed
Summary
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Temporal lobe epilepsy (TLE) with unilateral mesial temporal sclerosis shows symmetrical white matter damage in the fornix and cingulum. This suggests bilateral limbic system pathology in TLE patients.

Area of Science:

  • Neuroimaging
  • Neuroscience
  • Medical Physics

Background:

  • Diffusion tensor imaging (DTI) provides quantitative microstructural information on white matter integrity and brain connectivity.
  • DTI-derived tractography enables in vivo analysis of white matter pathways like the fornix and cingulum.
  • Previous studies have not utilized DTI tractography to examine these structures in temporal lobe epilepsy (TLE).

Purpose of the Study:

  • To investigate white matter integrity of the fornix and cingulum in patients with medically intractable TLE and unilateral mesial temporal sclerosis using DTI.
  • To compare microstructural differences in these limbic pathways between TLE patients and healthy controls.

Main Methods:

  • Eight patients with medically intractable TLE and unilateral mesial temporal sclerosis and nine healthy controls underwent DTI.

Related Experiment Videos

  • Fiber tracking was employed to delineate the fornix and cingulum.
  • Quantitative analysis of fractional anisotropy and diffusivity metrics was performed.

    • Main Results:

    • Patients with TLE exhibited bilateral symmetrical reductions in fractional anisotropy in the fornix.
    • Increased water mobility perpendicular to the fiber axis was noted in the fornix of TLE patients.
    • Similar bilateral abnormalities, including increased bulk diffusivity, were observed in the cingulum.

    Conclusions:

    • Medically intractable TLE with unilateral mesial temporal sclerosis is associated with symmetrical bilateral axonal integrity abnormalities in the fornix and cingulum.
    • These findings suggest widespread bilateral limbic system pathology in TLE, extending beyond the unilateral temporal sclerosis.