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Epilepsy surgery in the posterior cortex.

W T Blume1, S E Whiting, J P Girvin

  • 1Epilepsy Unit, University Hospital, University of Western Ontario, London, Canada.

Annals of Neurology
|June 1, 1991
PubMed
Summary
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Posterior corticectomy significantly reduced seizures in most epilepsy patients. While some achieved seizure freedom, others experienced new visual field deficits post-surgery.

Area of Science:

  • Neurosurgery
  • Epileptology
  • Clinical Neurology

Background:

  • Epilepsy surgery, particularly posterior corticectomy, is explored for intractable cases.
  • Understanding the efficacy and risks of resective surgery in specific epilepsy syndromes is crucial.

Purpose of the Study:

  • To evaluate the effectiveness and outcomes of posterior corticectomy in patients with refractory epilepsy.
  • To analyze factors contributing to surgical success and failure, including pre-existing conditions and post-operative complications.

Main Methods:

  • Retrospective analysis of 19 patients undergoing posterior corticectomy.
  • Surgical procedures involved resections of occipital, temporal, and parietal lobes.
  • Assessment of seizure reduction, seizure freedom, and post-operative complications, including visual field deficits.

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Main Results:

  • 74% of patients showed significant seizure reduction; 32% became seizure-free.
  • Visual phenomena were common ictal symptoms (68%).
  • Post-operative visual field deficits occurred in 43% of patients without pre-existing hemianopia, with 14% developing hemianopia.

Conclusions:

  • Posterior corticectomy offers significant seizure reduction for selected epilepsy patients.
  • Careful consideration of potential visual field deficits is necessary, especially with occipital lobe resections.
  • Identifying the epileptogenic zone is key for surgical planning and success.