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Anteromesial Temporal Lobectomy for Medically Intractable Temporal Lobe Epilepsy: An Operative Study

Anteromesial Temporal Lobectomy for Medically Intractable Temporal Lobe Epilepsy: An Operative Study

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Standard versus tailored left temporal lobe resections: differences in cognitive outcome?

W C J Alpherts¹, J Vermeulen, P C van Rijen

¹Department of Psychology, Epilepsy Centre of the Netherlands Foundation (SEIN), Heemstede, The Netherlands. walpherts@sein.nl

Neuropsychologia

|October 9, 2007

Summary

Standard resections for temporal lobe epilepsy risk verbal IQ decline, while tailored resections may impact short-term memory and attention. Careful surgical planning is crucial for cognitive outcomes.

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Last Updated: Jul 11, 2026

Anteromesial Temporal Lobectomy for Medically Intractable Temporal Lobe Epilepsy: An Operative Study

Anteromesial Temporal Lobectomy for Medically Intractable Temporal Lobe Epilepsy: An Operative Study

Published on: August 15, 2025

Translational Brain Mapping at the University of Rochester Medical Center: Preserving the Mind Through Personalized Brain Mapping

Translational Brain Mapping at the University of Rochester Medical Center: Preserving the Mind Through Personalized Brain Mapping

Published on: August 12, 2019

Area of Science:

Neurosurgery
Cognitive Neuroscience
Epilepsy Research

Background:

Left temporal lobe epilepsy often requires surgical intervention.
Cognitive outcomes following epilepsy surgery are a significant concern for patients.
Standard resection (SR) and tailored resection (TR) are surgical approaches with potentially different cognitive sequelae.

Purpose of the Study:

To compare cognitive outcomes between standard resection (SR) and tailored resection (TR) in patients with left temporal lobe epilepsy.
To investigate the impact of resection extent, particularly in the superior temporal gyrus (STG), on cognitive function.
To identify risks associated with different surgical strategies for temporal lobe epilepsy.

Main Methods:

A cohort of 100 patients with left temporal lobe epilepsy underwent either SR or TR.
Cognitive function was assessed using a battery of intelligence, language, and verbal memory tests preoperatively and at 6 months postoperatively.
Resection extents in three lateral gyri were controlled, with a specific focus on the superior temporal gyrus (STG).

Main Results:

The standard resection (SR) group showed a gain in digit span (short-term memory and attention), while the tailored resection (TR) group showed a loss.
Larger resections in the superior temporal gyrus (STG) within the SR group were associated with decreased verbal intelligence and a tendency towards reduced auditory comprehension.
Differences in resection extent in other gyri did not significantly affect language or verbal memory outcomes.

Conclusions:

Large standard anterior temporal lobe resections (up to 4.5 cm) carry a risk of declining verbal IQ and auditory comprehension, especially with extensive STG involvement.
Tailored resections, generally involving intraoperative language mapping, tend to result in a decline in short-term memory and attention tasks.