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Related Experiment Videos

Radiation-induced optic neuropathy.

Helen V Danesh-Meyer1

  • 1Academic Neuro-ophthalmology and Glaucoma, Department of Ophthalmology, University of Auckland, Auckland, 1142, New Zealand. h.daneshmeyer@auckland.ac.nz

Journal of Clinical Neuroscience : Official Journal of the Neurosurgical Society of Australasia
|December 11, 2007
PubMed
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Radiation-induced optic neuropathy (RION) causes irreversible vision loss after radiotherapy. Early detection and treatment are crucial, though outcomes remain poor.

Area of Science:

  • Neurology
  • Oncology
  • Radiology

Background:

  • Radiation-induced optic neuropathy (RION) is a severe complication of radiotherapy targeting the anterior visual pathway.
  • It leads to acute, profound, and irreversible vision loss, often due to radiation necrosis.

Purpose of the Study:

  • To review the characteristics, risk factors, diagnosis, and management of radiation-induced optic neuropathy.
  • To emphasize the importance of considering RION risk in radiotherapy treatment planning.

Main Methods:

  • Literature review of RION, focusing on clinical presentation, timing, radiation dose thresholds, and associated risk factors.
  • Discussion of diagnostic imaging, particularly MRI findings, and evaluation of treatment outcomes.

Main Results:

Related Experiment Videos

  • RION commonly occurs 10-20 months post-radiotherapy, with onset ranging from 3 months to 9 years.
  • Cumulative doses exceeding 50 Gy or single doses >10 Gy increase risk. Age, tumor compression, chemotherapy, and prior radiation are contributing factors.
  • MRI can detect radiation injury before vision loss, showing optic nerve enhancement.

Conclusions:

  • RION is a devastating complication with a poor prognosis, despite various treatment attempts.
  • Early detection of visual dysfunction and prompt hyperbaric oxygen therapy (within 72 hours) may offer some benefit.
  • The risk of RION must be weighed against the benefits when planning radiotherapy to the brain.