Baseline aneurysm characteristics
| Artery Location | Left | Right | Total (%) |
|---|---|---|---|
| Anterior circulation | 151 (75.5) | ||
| Ophthalmic | 25 | 10 | 35 (17.5) |
| Posterior communicating | 17 | 16 | 33 (16.5) |
| Anterior communicating | 20 (10) | ||
| Superior hypophyseal | 15 | 8 | 23 (11.5) |
| Internal carotid* | 8 | 11 | 19 (9.5) |
| Middle cerebral | 5 | 5 | 10 (5) |
| Carotid termination | 3 | 3 (1.5) | |
| Anterior choroidal | 2 | 1 | 3 (1.5) |
| Pericallosal | 2 | 1 | 3 (1.5) |
| Anterior cerebral | 1 | 1 | 2 (1) |
| Posterior circulation | 49 (24.5) | ||
| Basilar tip | 37 (18.5) | ||
| Superior cerebellar | 5 (2.5) | ||
| Vertebrobasilar junction | 2 (1) | ||
| Posterior cerebral | 2 (1) | ||
| Basilar trunk | 1 (0.5) | ||
| Posterior inferior cerebellar | 1 (0.5) | ||
| Vertebral | 1 (0.5) |
* Includes the cavernous/carotid cave/paraclinoid.