AVM characteristics (n=30)
| Characteristics | Incidence | % |
| Location: | ||
| Midbrain (tectum) | 17 (10) | 56.7 (33.3) |
| Pons (peduncle) | 11 (8) | 36.7 (26.7) |
| Medulla oblongata | 2 | 6.7 |
| Diameter of the nidus (cm) | 1.26 (0.44)2-150 | 0.57–2.002-151 |
| Volume of the nidus (cm3) | 1.35 (1.27)2-150 | 0.10–3.922-151 |
| Volume in the brain stem parenchyma (cm3) | 0.60 (0.49)2-150 | 0.10–2.002-151 |
| Arterial supply: | ||
| BA perforator | 11 | 36.7 |
| SCA | 15 | 50.0 |
| AICA | 7 | 23.3 |
| PICA | 5 | 16.7 |
| PChA | 8 | 26.7 |
| Venous drainage: | ||
| Galenic | 20 | 66.7 |
| Petrosal | 11 | 36.7 |
| Cortical | 1 | 3.3 |