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Transsylvian keyhole functional hemispherectomy.

J Schramm1, T Kral, H Clusmann

  • 1Department of Neurosurgery, University of Bonn Medical Center, Sigmund-Freud-Strasse 25, 53105 Bonn, Germany. Johannes.Schramm@ukb.uni-bonn.de

Neurosurgery
|September 21, 2001
PubMed
Summary
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A new transsylvian keyhole hemispherectomy offers a quicker, minimal-exposure surgical option. This functional hemispherectomy reduces operation time and blood replacement needs, providing satisfying seizure relief.

Area of Science:

  • Neurosurgery
  • Minimally Invasive Procedures
  • Epilepsy Surgery

Background:

  • Functional hemispherectomy is a treatment for intractable epilepsy.
  • Previous techniques involved extensive exposure and longer operation times.
  • A need exists for refined, less invasive hemispherectomy approaches.

Purpose of the Study:

  • To describe the transsylvian keyhole hemispherectomy technique.
  • To detail its technical steps, advantages, and limitations.
  • To evaluate its efficacy and safety in a patient cohort.

Main Methods:

  • A transsylvian/transsulcal approach was used for ventricular system access.
  • A small craniotomy (4x4 to 4x5 cm) was employed.
  • Key steps included callosotomy, amygdalohippocampectomy, and intraventricular white matter disconnection.

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Main Results:

  • Mean operation time was significantly reduced (3.6 hours) compared to other methods.
  • Fewer patients required blood transfusions (15% vs. 58%).
  • At a mean follow-up of 46 months, 88% achieved Engel Outcome Class I.

Conclusions:

  • The transsylvian keyhole procedure offers reduced operation time and blood replacement.
  • It is suitable for cases with enlarged ventricles or perinatal ischemic cysts.
  • This minimal-exposure technique is a viable alternative for functional hemispherectomy.