Location | Superficial | 117 | 72 (61.5) |
Deep | 18 | 14 (77.8) |
Supratentorial | 119 | 72 (60.5) |
Infratentorial | 16 | 14 (87.5) |
Size (cm) | <3 | 88 | 64 (72.7) |
3–6 | 43 | 21 (48.8) |
>6 | 4 | 1 (25.0) |
Venous drainage | Superficial only | 82 | 49 (59.8) |
Deep only | 23 | 20 (87.0) |
Both | 30 | 17 (56.7) |
Associated aneurysm | Intranidal | 7 | 6 (85.7) |
Prenidal | 4 | 3 (75.0) |
None | 124 | 76 (61.8) |
Venous pouch | Present | 15 | 8 (53.3) |
None | 120 | 78 (65.0) |
Draining veins | Single | 66 | 47 (71.2) |
Multiple | 69 | 39 (56.5) |
Venous ectasia | Present | 5 | 3 (60.0) |
None | 130 | 83 (63.9) |
Angiographic venous stenosis | Present | 24 | 17 (70.8) |
None | 111 | 69 (62.2) |
Functional venous stenosis | Present | 18 | 15 (83.3) |
None | 117 | 71 (60.7) |
Nidus morphology | Compact | 91 | 49 (53.8) |
Diffuse | 33 | 30 (90.9) |
Fistulous | 10 | 6 (60.0) |