Angiographic findings
| Overall | Nonpseudophlebitic | Pseudophlebitic | P | |
|---|---|---|---|---|
| Fistula location | ||||
| Transverse sigmoid | 63 (31.3) | 58 (40.6) | 5 (8.6) | <.0001 |
| Cavernous sinus | 27 (13.4) | 23 (16.1) | 4 (6.9) | |
| Tentorial | 54 (26.9) | 24 (16.8) | 30 (51.7) | |
| Foramen magnum | 7 (3.5) | 4 (2.8) | 3 (5.2) | |
| Superior sagittal sinus | 6 (3.0) | 1 (0.7) | 5 (8.6) | |
| Anterior cranial fossa | 5 (2.5) | 5 (3.5) | 0 (0.0) | |
| Extensive | 1 (0.5) | 1 (0.7) | 0 (0.0) | |
| Multiple | 9 (4.5) | 4 (2.8) | 5 (8.6) | |
| Hypoglossal/jugular foramen | 16 (8.0) | 13 (9.1) | 3 (5.2) | |
| Convexity | 7 (3.5) | 5 (3.5) | 2 (3.5) | |
| Middle cranial fossa | 2 (1.0) | 1 (0.7) | 1 (1.7) | |
| Other | 4 (2.0) | 4 (2.8) | 0 (0.0) | |
| Tentorial location | ||||
| Superior petrosal sinus | 8 (14.6) | 3 (12.5) | 5 (16.1) | .49 |
| Straight sinus | 1 (1.8) | 0 (0.0) | 1 (3.2) | |
| Galenic | 11 (20.0) | 4 (16.7) | 7 (22.6) | |
| Tentorial sinus | 25 (45.5) | 14 (58.3) | 11 (35.5) | |
| Torcular | 10 (18.2) | 3 (12.5) | 7 (22.6) | |
| Borden classification (non-cavernous sinus) | ||||
| I | 68 (33.8) | 68 (56.7) | 0 (0.0) | <.0001 |
| II | 27 | 13 (10.8) | 14 (25.9) | |
| III | 79 | 39 (32.5) | 40 (74.1) | |
| Cognard classification (non-cavernous sinus) | ||||
| I | 52 | 52 (43.3) | 0 (0.0) | |
| IIa | 16 | 16 (13.3) | 0 (0.0) | |
| IIb | 6 | 5 (4.2) | 1 (1.9) | |
| IIa+b | 22 | 7 (5.8) | 15 (27.8) | <.0001 |
| III | 22 | 17 (14.2) | 5 (9.3) | |
| IV | 52 | 22 (18.3) | 30 (55.6) | |
| V | 4 | 1 (0.8) | 3 (5.6) | |
| Venous dilation | 76 (37.8) | 34 (23.8) | 42 (72.4) | <.0001 |
| Venous varix | 57 (28.4) | 20 (14.0) | 37 (63.8) | <.0001 |
| Draining vein stenosis | 48 (23.9) | 22 (15.4) | 26 (44.8) | <.0001 |