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Anteromesial Temporal Lobectomy for Medically Intractable Temporal Lobe Epilepsy: An Operative Study
Published on: August 15, 2025
Changes in fiber tract integrity and visual fields after anterior temporal lobectomy
C R McDonald1, D J Hagler, H M Girard
1Department of Psychiatry, Multimodal Imaging Laboratory, University of California-San Diego, 8950 Villa La Jolla Drive, La Jolla, CA 92037, USA. camcdonald@ucsd.edu
Neurology
|October 1, 2010
Summary
Following anterior temporal lobectomy (ATL) for temporal lobe epilepsy (TLE), diffusion tensor imaging (DTI) shows stable fiber tract degeneration within a year. These changes may correlate with visual field defects.
Area of Science:
- Neuroimaging
- Neurosurgery
- Epilepsy Research
Background:
- Temporal lobe epilepsy (TLE) is a common neurological disorder.
- Anterior temporal lobectomy (ATL) is a surgical treatment for TLE.
- Understanding postoperative changes in brain connectivity is crucial.
Purpose of the Study:
- To investigate fiber tract integrity changes after ATL in TLE patients.
- To determine if these changes are progressive or stable.
- To assess the relationship between fiber tract changes and visual field defects.
Main Methods:
- Diffusion tensor imaging (DTI) used to assess fractional anisotropy (FA).
- DTI scans obtained before, 2 months after, and 1 year after ATL in 7 TLE patients.
- Voxel-wise analysis and quantitative visual field analysis performed.
Main Results:
- Decreased FA observed in ipsilateral tracts 2 months post-ATL.
- No significant FA progression from 2 months to 1 year post-surgery.
- FA reductions correlated with the extent and location of visual field defects in some cases.
Conclusions:
- Wallerian degeneration is evident early after ATL and affects directly and indirectly impacted fibers.
- Fiber tract integrity changes appear stable within one year post-surgery.
- Postoperative fiber tract changes may be linked to visual field deficits.
