DAVF location and type
| DAVF Type | ||||||||
|---|---|---|---|---|---|---|---|---|
| Location | No. | I | II a | II b | II a + b | III | IV | V |
| Sigmoid sinus | 15 | 5 | 3 | 4 | 3 | 0 | 0 | 0 |
| Transverse sinus | 5 | 0 | 0 | 3 | 0 | 2 | 0 | 0 |
| Superior sagittal sinus | 10 | 0 | 0 | 1 | 0 | 8 | 1 | 0 |
| Anterior fossa | 6 | 0 | 0 | 1 | 0 | 1 | 4 | 0 |
| Tentorium | 5 | 0 | 0 | 0 | 0 | 4 | 0 | 1 |
| Other | 3 | 0 | 0 | 2 | 0 | 0 | 0 | 0 |
| Total | 44 | 5 | 4 | 11 | 3 | 15 | 5 | 1 |