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Long-term visual changes following pituitary irradiation

B Movsas1, T Z Movsas, S M Steinberg

  • 1Radiation Oncology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA.

International Journal of Radiation Oncology, Biology, Physics
|October 15, 1995
PubMed
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Radiotherapy for pituitary tumors is safe and effective, with no long-term vision loss. Higher radiation doses may increase the risk of neurovascular symptoms like headaches.

Area of Science:

  • Oncology
  • Neurology
  • Ophthalmology

Background:

  • Pituitary tumors require treatment that balances efficacy with potential side effects.
  • Long-term effects of radiotherapy on visual function are a concern for patients with pituitary adenomas.

Purpose of the Study:

  • To investigate the long-term impact of pituitary irradiation on visual fields and visual acuity.
  • To assess the safety and efficacy of radiotherapy for pituitary tumors.

Main Methods:

  • Retrospective analysis of 86 patients treated with radiotherapy for pituitary tumors between 1980-1991.
  • Serial visual field testing (Goldmann or Humphrey) for 21 patients with baseline and follow-up data.
  • Correlation of visual field changes with neuroradiologic findings and radiation dose.

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Main Results:

  • No cases of radiation-induced visual field or acuity deterioration were observed.
  • 27 out of 38 sighted eyes maintained normal visual fields post-radiation; 7 showed improvement.
  • A trend suggested increased neurovascular symptoms (e.g., headaches) with radiation doses exceeding 50 Gy (p=0.064).

Conclusions:

  • Postoperative radiotherapy for pituitary adenomas is highly effective and safe, with a 95% recurrence-free rate.
  • Visual fields and acuity are generally preserved long-term after modern radiotherapy techniques.
  • Higher radiation doses may be associated with an increased incidence of neurovascular symptoms.