Do Larger Resections Cut It? Relating Temporal Lobe Epilepsy Surgery and Seizure Outcome

Area of Science:

• Neurosurgery
• Epileptology
• Neuroimaging

Background:

• Anterior temporal lobe resection (ATLR) offers seizure freedom for approximately 50% of drug-resistant temporal lobe epilepsy (TLE) patients.
• The relationship between the extent of ATLR and seizure freedom remains debated, with conflicting findings on whether larger resections improve outcomes.

Purpose of the Study:

• To investigate the association between the volume of anterior temporal lobe resection and 12-month seizure freedom in TLE patients.
• To analyze both total resection volume and regional resection percentages in relation to surgical outcomes.

Main Methods:

• Retrospective analysis of 283 patients undergoing ATLR, collecting demographic data and resection volumes.
• Calculation of percentage resection for Desikan-Kiliany parcellated brain regions.
• Statistical analysis using Area Under the Curve (AUC) for effect sizes and Wilcoxon ranksum tests for significance.

Main Results:

• Total resection volumes were greater in males and for right-sided ATLR compared to left.
• When normalized to brain tissue percentage, only hemisphere differences persisted, not total volume.
• No significant correlation was found between total or regional resection volume and 12-month post-operative seizure freedom.

Conclusions:

• Within the typical range of ATLR, increasing resection volume does not enhance the likelihood of seizure freedom.
• Differences in resection volumes between sexes and hemispheres are attributed to brain size and surgical conservatism in dominant hemispheres.
• Future research should explore the impact of specific gray matter structures and white matter tracts on seizure control post-ATLR.