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Radiation tolerance limits of the brainstem.

Manish S Sharma1, Douglas Kondziolka, Aftaab Khan

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Gamma knife surgery for brainstem lesions can cause adverse radiation imaging effects (ARIE) and neurological deficits, especially in younger patients. Careful planning of brainstem exposure volume is crucial for radiosurgery safety.

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Area of Science:

  • Neurosurgery
  • Radiation Oncology
  • Radiosurgery

Background:

  • Gamma knife surgery is limited by brainstem radiation safety tolerance.
  • Intra-axial brainstem lesions pose unique challenges for radiosurgery.

Purpose of the Study:

  • To analyze the incidence of adverse radiation imaging effects (ARIE) and new neurological deficits after gamma knife surgery for intra-axial brainstem lesions.
  • To identify factors influencing brainstem tolerance to radiosurgery.

Main Methods:

  • Retrospective analysis of 38 patients (39 lesions) with brainstem astrocytomas or vascular malformations treated with gamma knife surgery.
  • Calculation of brainstem exposure volume (12 Gray volume minus prescription volume).
  • Definition of ARIE as new parenchymal signal alteration on MRI.

Main Results:

  • Seven patients (18.4%) developed ARIE, correlating with new neurological deficits and younger age (<40 years).
  • Brainstem exposure volume averaged 0.57 cm³.
  • Three patients (7.9%) had minor deficits without ARIE; no mortality was observed.

Conclusions:

  • Exposure of the brainstem to >12 Gy, even at small volumes (0.1 cm³), can cause ARIE and deficits.
  • Brainstem tolerance is influenced by patient age, lesion volume, and pathology.
  • Analyzing exposed brainstem volume aids radiosurgical planning.