Degree of angiographic occlusion and mean percentage of volumic occlusion of aneurysms according to aneurysmal sac and neck sizes and the ratio of sac to neck size at completion of the initial endovascular treatment
| Measurement | Sac Size | Neck Size | Sac-to-Neck Ratio | ||||
|---|---|---|---|---|---|---|---|
| <10 mm | 10–24 mm | ≤4 mm | >4 mm | ≥3 | 1.5–3 | <1.5 | |
| Percentage of volumic occlusion (mean ± SD) | 31.5 ± 7.8 | 26.0 ± 8.5 | 30.9 ± 8.5 | 29.2 ± 7.2 | 32.8 ± 8.1 | 30.4 ± 7.5 | 27.2 ± 9.6 |
| Degree of angiographic occlusion* | |||||||
| Complete | 93 (72) | 21 (68) | 84 (72) | 30 (68) | 28 (80) | 67 (68) | 19 (73) |
| Near complete | 35 (27) | 8 (26) | 30 (26) | 13 (30) | 7 (28) | 30 (30) | 6 (23) |
| Incomplete | 1 (1) | 2 (6) | 2 (2) | 1 (2) | 0 (0) | 2 (2) | 1 (4) |
| No. of aneurysms | 129 | 31 | 116 | 44 | 35 | 99 | 26 |
* Data are number (%) of aneurysms.