Radiologic characteristics of aneurysms
| Characteristic | Total | Small (<7 mm) | Large (≥7 mm) | P |
|---|---|---|---|---|
| Total no. | 400 | 285 | 115 | |
| Largest dimension of aneurysm | ||||
| Mean, mm | 6.5 ± 2.8 | 5.1 ± 1.0 | 10.0 ± 2.8 | |
| Distribution | ||||
| <5 mm | 136 (34.0%) | 136 (47.7%) | ||
| 5−6 mm | 149 (37.3%) | 149 (52.3%) | ||
| 7−9 mm | 63 (15.8%) | 63 (54.8%) | ||
| 10−24 mm | 52 (13.0%) | 52 (45.2%) | ||
| ≥25 mm | 0 (0.0%) | |||
| Neck size ≥4 mm | 135 (33.8%) | 59 (20.7%) | 76 (66.1%) | <.001 |
| Dome:neck ratio | ||||
| Mean, mm | 1.7 ± 0.6 | 1.6 ± 0.4 | 2.2 ± 0.7 | <.001 |
| ≤2 | 299 (74.8%) | 243 (85.3%) | 56 (48.7%) | <.001 |
| Wide neck 1a | 326 (81.5%) | 243 (85.3%) | 83 (72.2%) | .002 |
| Location of aneurysm | ||||
| Anterior wall | 97 (24.3%) | 59 (20.7%) | 38 (33.0%) | |
| Ventral paraclinoid | 101 (25.3%) | 70 (24.6%) | 31 (27.0%) | |
| True ophthalmic | 52 (13.0%) | 34 (11.9%) | 18 (15.7%) | |
| Carotid cave | 150 (37.5%) | 122 (42.8%) | 28 (24.3%) | .003 |
↵a One neck of ≥4 mm or dome:neck ≤ 2.