TABLE 2.
Radiological Characteristics and Lesion Grades of 20 Surgically Resected Arteriovenous Malformations and 33 Lesions Managed Nonsurgically
| Characteristic | Surgery n (%) | No surgery |
|---|---|---|
| Deep venous drainage | 2 (10) | 2 (6) |
| Eloquent | 8 (40) | 10 (30) |
| Lobe | ||
| Frontal | 9 (45) | 18 (55) |
| Parietal | 4 (20) | 2 (6) |
| Occipital | 2 (10) | 7 (21) |
| Cerebellum | 2 (10) | 3 (9) |
| Temporal | 2 (10) | 2 (6) |
| Deep | 1a (5) | 1b (3) |
| Spetzler–Martin grade | ||
| 1 | 9 (45) | 22 (66) |
| 2 | 9 (45) | 9 (27) |
| 3 | 2 (10) | 1 (3.5) |
| 4 | 0 | 1 (3.5) |
| 5 | 0 | 0 |
| Lawton–Young grade | ||
| 1 | 1 (5) | 0 |
| 2 | 7 (35) | 8 (24) |
| 3 | 3 (15) | 12 (37) |
| 4 | 9 (45) | 11 (33) |
| 5 | 0 | 2 (6) |
| Supplemented Spetzler–Martin gradec | ||
| 2 | 0 | 0 |
| 3 | 3 (15) | 5 (15) |
| 4 | 7 (35) | 9 (27.5) |
| 5 | 6 (30) | 12 (36.5) |
| 6 | 3 (15) | 7 (21) |
| 7 | 1 (5) | 0 |
| 8 | 0 | 0 |
| 9 | 0 | 0 |
| 10 | 0 | 0 |
aBrainstem.
bThalamus.
cSupplemented Spetzler–Martin grade is the add-up of Spetzler–Martin and Lawton–Young grades.