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Stereotactic radiosurgery for postgeniculate visual pathway arteriovenous malformations

B E Pollock1, L D Lunsford, D Kondziolka

  • 1Department of Neurological Surgery, and the Center for Image-Guided Neurosurgery, University of Pittsburgh Medical Center, Pennsylvania, USA.

Journal of Neurosurgery
|March 1, 1996
PubMed
Summary

Stereotactic radiosurgery effectively treats visual pathway arteriovenous malformations (AVMs), preserving vision in most patients. Multimodality management further enhances obliteration and visual preservation rates, reducing hemorrhage risk.

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Area of Science:

  • Neurology
  • Neurosurgery
  • Radiology

Background:

  • Postgeniculate optic radiation and striate cortex arteriovenous malformations (AVMs) pose significant resection challenges, risking postoperative visual deficits.
  • AVMs of the visual pathways carry a risk of hemorrhage and potential visual impairment.

Purpose of the Study:

  • To evaluate the efficacy and safety of stereotactic radiosurgery for treating AVMs within the visual pathways.
  • To assess the rates of AVM obliteration and visual function preservation following radiosurgery.

Main Methods:

  • Stereotactic radiosurgery was performed on 34 patients with newly diagnosed or residual visual pathway AVMs.
  • The average AVM volume was 4.7 ml, with a mean marginal radiation dose of 21 Gy.
  • Follow-up included serial angiography to assess AVM obliteration.

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Main Results:

  • Complete AVM obliteration was achieved in 65% of patients after initial radiosurgery, with an overall obliteration rate of 71% after staged treatment.
  • Only 6% of patients experienced new visual field defects post-treatment; no permanent homonymous hemianopsia occurred.
  • The annual risk of AVM bleeding was 2.4% before obliteration, with no bleeding events observed after confirmed obliteration.

Conclusions:

  • Stereotactic radiosurgery is an effective treatment for visual pathway AVMs, successfully obliterating malformations while preserving visual function in most cases.
  • Multimodality management, including embolization, microsurgery, or staged radiosurgery, improves obliteration and visual preservation outcomes.
  • Radiosurgery significantly reduces the risk of hemorrhage from visual pathway AVMs.