Epilepsy-related cytoarchitectonic abnormalities along white matter pathways

Area of Science:

• Neuroimaging
• Epilepsy Research
• White Matter Integrity

Background:

• Temporal lobe epilepsy (TLE) is a common neurological disorder with unclear clinical outcomes.
• Current diagnostic methods do not fully capture the network abnormalities in TLE.
• Understanding white matter (WM) connectivity changes is crucial for TLE characterization.

Purpose of the Study:

• To investigate microstructural changes in WM pathways in TLE using diffusional kurtosis imaging (DKI).
• To compare along-the-tract measures in TLE patients and controls.
• To explore the relationship between WM changes, seizure burden, and antiepileptic drug control.

Main Methods:

• Utilized diffusional kurtosis imaging (DKI) for characterizing microstructural WM changes.
• Compared along-the-tract measures in 32 TLE subjects and 36 controls across key WM pathways (FF, PWMB, AF, ILF, UF, CB).
• Investigated limbic pathways in relation to seizure burden and medication.

Main Results:

• Identified localized WM abnormalities in specific subregions of the FF, PWMB, UF, AF, and ILF in TLE patients.
• DKI detected abnormalities missed by conventional diffusivity-based measures.
• Structural WM changes in the bilateral PWMB and cingulum correlated with seizure burden.

Conclusions:

• DKI enhances the characterization of TLE-associated network abnormalities.
• DKI reveals connectivity issues not apparent with other imaging modalities.
• DKI is a promising tool for assessing structural network abnormalities and phenotypic characterization in TLE.