- Number and pattern of venous sinus involvement
| Thrombosed venous sinuses and veins | n (%) |
|---|---|
| Transverse sinus | 28 (77.7) |
| Sigmoid sinus | 22 (61.1) |
| Internal jugular vein | 17 (47.2) |
| Superior sagittal sinus | 16 (44.4) |
| Straight sinus | 3 (8.3) |
| Vein of Galen | 2 (5.5) |
| Inferior sagittal sinus | 1 (2.7) |
| Single sinus involvement | |
| Superior sagittal sinus alone | 5 (13.8) |
| Straight sinus alone | 1 (2.7) |
| Two sinuses involvement | |
| Sigmoid and transverse sinus | 4 (11.1) |
| Transverse and superior sagittal sinus | 2 (5.5) |
| Transverse and straight sinus | 1 (2.7) |
| Sigmoid and cavernous sinus | 1 (2.7) |