Resective surgery prevents progressive cortical thinning in temporal lobe epilepsy

Area of Science:

• Neurology
• Neurosurgery
• Radiology

Background:

• Focal epilepsy, specifically temporal lobe epilepsy (TLE), is linked to accelerated cortical atrophy.
• This atrophy rate in TLE patients is more than double that observed in healthy aging.

Purpose of the Study:

• To investigate whether epilepsy surgery can interrupt the progressive cortical thinning associated with TLE.
• To assess the neuroprotective potential of epilepsy surgery by examining changes in cortical thickness.

Main Methods:

• A longitudinal case-control neuroimaging study involving patients with unilateral TLE (pre- and post-surgery) and healthy volunteers.
• Structural MRI scans were used to measure cortical thickness, with analysis using linear mixed effects models.
• Vertex-wise analysis compared progressive thinning rates between groups.

Main Results:

• Presurgical TLE patients exhibited bilateral cortical atrophy beyond the temporal lobe, with significantly accelerated thinning compared to healthy controls.
• Anterior temporal lobe resection reduced cortical thinning in affected areas postoperatively.
• Patients remaining seizure-free after surgery showed no significant progressive thinning, similar to normal aging. Those with persistent seizures had some continued accelerated thinning.

Conclusions:

• Successful epilepsy surgery, particularly anterior temporal lobe resection, effectively prevents progressive cortical atrophy in TLE.
• The neuroprotective effect is more pronounced in seizure-free patients, normalizing atrophy rates to those of normal aging.
• These findings support early surgical intervention for refractory TLE to prevent further brain damage.