Comparison of demographic and angiographic data between ruptured and unruptured groups (N = 79)
| Variable | Ruptured | Unruptured | Total |
|---|---|---|---|
| Age (mean ± SD), y | 55 ± 10 | 54 ± 11 | 55 ± 10 |
| Female, N (%) | 21 (66) | 31 (66) | 52 (66) |
| Aneurysm diameter (mean ± SD), mm | 7.4 ± 3.1 | 7.1 ± 3.4 | 7.3 ± 3.3 |
| Location of aneurysm | |||
| Anterior circulation | |||
| Cavernous ICA | 1 | 1 | 2 |
| Paraclinoid ICA* | 2 | 11 (1) | 13 (1) |
| Posterior communicating artery | 4 (1) | 3 | 7 (1) |
| ICA dorsal wall | 0 | 2 | 2 |
| ICA bifurcation | 0 | 1 | 1 |
| Anterior communicating artery | 7 | 9 | 16 |
| Pericallosal artery | 0 | 3 | 3 |
| MCA bifurcation | 2 | 3 | 5 |
| Posterior circulation | |||
| Basilar artery tip | 9 (3) | 13 | 22 (3) |
| Superior cerebellar artery | 1 | 1 | 2 |
| Vertebrobasilar junction | 2 | 0 | 2 |
| Posterior inferior cerebellar artery | 4 | 0 | 4 |
| Total | 32 (4) | 47 (1) | 79 (5) |
Note:—Numbers in parentheses denote retreated aneurysms. ICA indicates internal carotid artery; MCA, middle cerebral artery; Paraclinoid ICA aneurysms included all aneurysms arising from the superior hypophyseal artery, ophthalmic artery, carotid cave, and clinoidal ICA segment.