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Full-Endoscopic Surgery for Hypothalamic Hamartoma Resection
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Pediatric functional hemispherectomy: operative techniques and complication avoidance.

Christopher C Young1, John R Williams1, Abdullah H Feroze1

  • 11Department of Neurological Surgery, University of Washington.

Neurosurgical Focus
|April 3, 2020
PubMed
Summary

Functional hemispherectomy/hemispherotomy offers a refined surgical approach for severe epilepsy. This disconnection procedure improves seizure freedom and functional outcomes, especially in pediatric patients.

Keywords:
ACA = anterior cerebral arteryAED = antiepileptic drugEEG = electroencephalographyEVD = external ventricular drainIONM = intraoperative neurophysiological monitoringMCA = middle cerebral arteryepilepsy surgeryfMRI = functional MRIhemispherectomyhemispherotomyosteoplastic flap

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Area of Science:

  • Neurosurgery
  • Epileptology
  • Pediatric Neurology

Background:

  • Functional hemispherectomy/hemispherotomy is a disconnection procedure for severe epilepsy localized to one hemisphere.
  • It represents an advancement over anatomical hemispherectomy, with refinements aimed at reducing complications and improving outcomes.
  • The procedure involves disconnecting key anatomical structures within the brain hemisphere.

Purpose of the Study:

  • To summarize the historical development and evolution of hemispherectomy techniques.
  • To provide a graphical guide for the anatomically complex hemispherectomy/hemispherotomy procedure.
  • To discuss improvements in surgical outcomes, including the use of osteoplastic flaps and hydrocephalus management.

Main Methods:

  • Disconnection of critical neuroanatomical pathways including the internal capsule, corona radiata, mesial temporal structures, insula, and corpus callosum.
  • Stepwise surgical approach to ensure complete disconnection and prevent seizure recurrence.
  • Application of modern surgical techniques and careful patient selection, particularly in pediatric cases.

Main Results:

  • Functional hemispherectomy/hemispherotomy has demonstrated significant improvements over anatomical hemispherectomy.
  • High rates of seizure freedom, exceeding 80%, are achievable in young pediatric patients.
  • Very good functional outcomes are reported in pediatric populations undergoing the procedure.

Conclusions:

  • Functional hemispherectomy/hemispherotomy is an effective treatment for severe, medically refractory epilepsy with unilateral hemispheric seizure foci.
  • Modern surgical refinements and patient selection enhance efficacy and safety, leading to excellent seizure control and functional recovery.
  • The procedure, when performed meticulously, offers a viable solution for intractable epilepsy, with ongoing advancements improving patient prognosis.