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Diffusion tensor imaging of partial intractable epilepsy.

Anne Dumas de la Roque1, Catherine Oppenheim, Francine Chassoux

  • 1Department of Neuroradiology, Sainte-Anne Hospital, 1 rue Cabanis, 75674, Paris cedex 14, France.

European Radiology
|December 30, 2004
PubMed
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Diffusion tensor imaging (DTI) detects white matter (WM) abnormalities in partial intractable epilepsy patients, even when conventional MRI shows none. This advanced imaging technique is valuable for identifying subtle WM changes near lesions.

Area of Science:

  • Neuroimaging
  • Neurology
  • Medical Physics

Background:

  • Partial intractable epilepsy often involves subtle white matter (WM) abnormalities.
  • Conventional MRI may not detect these WM changes, complicating diagnosis and treatment planning.

Purpose of the Study:

  • To evaluate the diagnostic value of diffusion tensor imaging (DTI) for detecting WM abnormalities in patients with partial intractable epilepsy.
  • To compare DTI findings with conventional MRI and histological data.

Main Methods:

  • Diffusion tensor imaging (DTI) with 25 non-collinear directions was performed on 15 patients with cortical lesions.
  • Fractional anisotropy (FA) was measured in the internal capsule and normal-appearing white matter (WM) adjacent to and distant from the lesion.
  • FA values were compared between ipsilateral and contralateral sides, with a 10% threshold for abnormality.

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Main Results:

  • Significantly reduced FA was observed in WM adjacent to and distant from the lesion, while the internal capsule showed normal FA.
  • 13 out of 15 patients exhibited >10% FA reduction in adjacent WM, and 12 out of 15 in distant WM.
  • Histological analysis in 9/10 surgically treated patients confirmed WM alterations like gliosis and axonal loss.

Conclusions:

  • DTI is effective in revealing WM abnormalities not visible on conventional MRI in patients with partial intractable epilepsy.
  • DTI findings correlate with histological evidence of WM damage, suggesting its utility in surgical planning and understanding epilepsy pathophysiology.