The Lawton-Young classification[^1] is a supplementary grading system to the Spetzler-Martin classification for arteriovenous malformations (AVMs).
Classification
Points | Patient age |
1 | < 20 years |
2 | 20 - 40 years |
3 | > 40 years |
Points | Presentation |
0 | Ruptured |
1 | Unruptured |
Points | Pattern of venous drainage |
0 | Compact nidus |
1 | Diffuse nidus |