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Related Experiment Videos

Radiation optic neuropathy after stereotactic radiosurgery

C A Girkin1, C H Comey, L D Lunsford

  • 1Department of Ophthalmology, University of Alabama School of Medicine, Birmingham, USA.

Ophthalmology
|October 23, 1997
PubMed
Summary

Optic neuropathy is a rare complication following stereotactic radiosurgery for perichiasmal tumors. Careful dose planning, limiting radiation to visual pathways, can reduce this risk.

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Area of Science:

  • Neurology
  • Ophthalmology
  • Radiation Oncology

Background:

  • Stereotactic radiosurgery (SRS) is used for perichiasmal tumors.
  • Visual pathway complications are a concern with SRS in this region.

Observation:

  • Four patients developed optic neuropathy 7-30 months post-SRS.
  • Sudden visual deterioration and anterior visual pathway involvement were noted.
  • MRI revealed swelling and enhancement of visual pathways in three patients.

Findings:

  • Visual field defects included nerve fiber bundle and homonymous hemianopic patterns.
  • Corticosteroids offered partial recovery in one patient; hyperbaric oxygen was ineffective.
  • Optic neuropathy is a rare but significant complication of SRS for perichiasmal tumors.

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Implications:

  • MRI-guided dose planning is crucial for SRS near visual pathways.
  • Limiting maximal radiation dose to visual pathways below 8 Gy may prevent optic neuropathy.
  • This highlights the importance of precise radiation delivery to minimize visual morbidity.