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Updated: May 26, 2025

Investigations on Alterations of Hippocampal Circuit Function Following Mild Traumatic Brain Injury
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Multiple Hippocampal Transections: Initial Clinical Experience with Modified Technique.

Jan Šroubek1, Lenka Krámská2, Michaela Nová3

  • 1Department of Neurosurgery, Na Homolce Hospital, Prague, Czech Republic; Department of Neurosurgery, Faculty of Medicine, Charles University, Hradec Kralove, Czech Republic.

World Neurosurgery
|February 21, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a modified multiple hippocampal transection (MHT) technique for mesial temporal lobe epilepsy (MTLE) patients with MRI-negative findings. The procedure effectively reduced seizures while preserving cognitive function and memory performance.

Keywords:
EpilepsyMemoryMultiple hippocampal transectionTemporal lobe

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Area of Science:

  • Neurosurgery
  • Epileptology
  • Neuropsychology

Background:

  • Standard treatments for mesial temporal lobe epilepsy (MTLE), such as anteromesial temporal resection or amygdalohippocampectomy, carry a risk of postoperative memory impairment, particularly in patients with magnetic resonance imaging (MRI)-negative findings.
  • Multiple hippocampal transections (MHTs) offer a potential alternative by interrupting hippocampal pathways to control seizures while preserving memory circuits.

Purpose of the Study:

  • To evaluate a modified technique for complete multiple hippocampal transections (MHTs) in patients with pharmacoresistant, unilaterally lateralized MTLE and MRI-negative findings.
  • To assess the efficacy of this MHT technique in reducing seizures and preserving neuropsychological function, specifically memory performance.

Main Methods:

  • Three patients with pharmacoresistant MTLE and MRI-negative findings underwent complete MHT.
  • Postoperative evaluations included comprehensive neuropsychological and epileptological assessments, as well as MRI follow-ups at 1 and 2 years.
  • Primary outcomes measured were seizure reduction and significant changes in neuropsychological performance.

Main Results:

  • All three patients completed the 2-year follow-up.
  • Two patients achieved Engel 1 seizure outcome, and one achieved Engel 3.
  • Neuropsychological testing at 2 years showed no significant decline in memory or most cognitive functions. MRI revealed hippocampal volume reduction.

Conclusions:

  • The modified MHT technique successfully reduced seizures in MTLE patients with MRI-negative findings.
  • This approach preserved overall neuropsychological performance, including memory, indicating its potential as a viable surgical option.