Pollock-Flickinger score

AVM grading for radiosurgery

Formula

AVM score = 0.1 * volume + 0.02 * age + 0.5 * location

Parameter info

  • volume: in mL /cc
  • age: in years
  • location: superficial (hemispheric/corpus callosum/cerebellar) = 0; deep (basal ganglia/thalamus/ brainstem) = 1

    • Chance (in %) of excellent outcome (with 95% CI)

  • AVM score ≤1.00: 89 (79-94)
  • AVM score 1.01 - 1.50: 70 (59-79)
  • AVM score 1.51 - 2.00: 64 (51-75)
  • AVM score >2.00: 46 (33-60)

    • Chance (in %) of modified Rankin Scale decline (with 95% CI)

  • AVM score ≤1.00: 0 (0-8)
  • AVM score 1.01 - 1.50: 13 (7-22)
  • AVM score 1.51 - 2.00: 20 (12-32)
  • AVM score >2.00: 36 (24-50)

    • Reference

    Wegner RE, Oysul K, Pollock BE, Sirin S, Kondziolka D, Niranjan A, et al. A modified radiosurgery-based arteriovenous malformation grading scale and its correlation with outcomes. Int J Radiat Oncol Biol Phys 2011; 79:1147-1150.