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)

Pollock BE, Flickinger JC. Modification of the radiosurgery-based arteriovenous malformation grading system. Neurosurgery 2008; 63:239-43.