Radiosurgery Based AVM Score (RBAS)

This score is used to predict outcomes following single or repeat LINAC (Linear Accelerator) radiosurgery in AVM.

  • Score is based on a validation cohort study of 403 patients with AVM treated with LINAC radiosurgery  and assigned an RBAS score

 

RBAS Score is calculated as:

               (0.1 × volume in cm3) + (0.02 × age in years) + (0.3 × location value)

  • location values
    • 0 = frontal/temporal
    • 1 = parietal/occipital/corpus callosum/cerebellar
    • 2 = basal ganglia/thalamus/brainstem

 

  • EXCELLENT Outcome = obliteration of AVM without deficit
    • RBAS <1 = 74%
    • RBAS 1-1.8 = 64%
    • RBAS 1.8-<2.5 = 50%
    • RBAS >=2.5 = 11%

References

Raffa, Scott J. et al. “Validation Of The Radiosurgery-Based Arteriovenous Malformation Score In A Large Linear Accelerator Radiosurgery Experience”. Journal of Neurosurgery 111.4 (2009): 832-839. Web.

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