Lawton et al reported a supplementary grading system to the Spetzler-Martin grading system for patients with a brain arteriovenous malformation (AVM).
Parameters:
(1) age in years
(2) bleeding
(3) compactness
Parameters
Findings
Points
age in years
< 20 years
1
20 to 40 years
2
> 40 years
3
unruptured
no (bleeding)
0
yes
1
diffuse
yes
1
no (compact)
0
total score =
= SUM(points for all 3 parameters)
Interpretation:
• minimum score: 1
• maximum score: 5
• The score is the supplemental grade.
• The supplemental score can be added to the Spetzler-Martin score for a combined grade from 0 to 10. A combined grade <= 6 has an acceptably low surgical risk.
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