Locations of aneurysms
| Location | Ruptured (n = 118) | Unruptured (n = 72) |
|---|---|---|
| Anterior circulation | 88 (74.6) | 53 (73.6) |
| Anterior choroidal artery | 4 | 2 |
| Posterior communicating artery | 3 | 4 |
| Paraclinoid ICA | 7 | 32 |
| ICA bifurcation | 5 | 2 |
| A1 segment of the ACA | 1 | 1 |
| Anterior communicating artery | 45 | 6 |
| Distal ACA | 6 | 1 |
| M1 segment of the MCA | 1 | 0 |
| MCA bifurcation | 6 | 5 |
| Posterior circulation | 30 (25.4) | 19 (26.4) |
| Basal artery tip | 16 | 11 |
| Distal posterior cerebral artery | 3 | 1 |
| Superior cerebellar artery | 2 | 3 |
| Basal artery trunk | 1 | 1 |
| Vertebrobasilar junction | 1 | 0 |
| Posterior inferior cerebellar artery | 7 | 3 |
Note.—Data in parentheses are percentages. ACA is anterior cerebral artery; ICA, internal carotid artery; and MCA, middle cerebral artery.