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Language function following subdural grid-directed temporal lobectomy

K G Davies1, R E Maxwell, P Jennum

  • 1Department of Neurosurgery, University of Minnesota, Minneapolis.

Acta Neurologica Scandinavica
|September 1, 1994
PubMed
Summary
This summary is machine-generated.

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Temporal lobectomy (TL) up to 5 cm is generally safe for language function. However, some patients may have language areas closer to the temporal pole, requiring careful mapping to avoid deficits.

Area of Science:

  • Neurosurgery
  • Epilepsy Research
  • Neuroscience

Background:

  • Temporal lobectomy (TL) is a common treatment for intractable epilepsy.
  • Understanding the precise location of temporal language areas is crucial to prevent postoperative deficits.

Purpose of the Study:

  • To determine the safe extent of temporal resection without risking temporal language areas.
  • To map the variability of temporal language cortex proximity to the temporal pole.

Main Methods:

  • Subdural electrode array (SEA) placement in patients undergoing craniotomy for epilepsy.
  • Intracarotid sodium amytal injection for hemisphere dominance determination.
  • Mapping of temporal lobe speech arrest (SA) using a 64-contact SEA.

Related Experiment Videos

Main Results:

  • Speech arrest (SA) was typically located 5-9 cm from the temporal pole (median 7 cm) in left-dominant hemispheres.
  • Temporal lobectomy (TL) up to 5 cm showed no significant language deterioration in most patients.
  • Extensive lateral resections up to 9 cm preserved language function with stimulation mapping.

Conclusions:

  • TL up to 5 cm is safe for most patients, but 3% may be at risk due to anterior language areas.
  • Stimulation cortical mapping allows for extensive lateral resections (up to 9 cm) while preserving language function.