Location of aneurysms
| Anterior Circulation | 61 | Posterior Circulation | 19 |
| Internal carotid artery | 20 | Vertebral artery | 4 |
| Internal carotid termination | 4 | Basilar artery | 9 |
| C1 | 12 | Posterior cerebral artery | 4 |
| C2 | 3 | Posterior inferior cerebellar artery | 2 |
| C3 | 1 | ||
| Middle cerebral artery | 9 | ||
| Anterior cerebral artery | 3 | ||
| Anterior communicating artery | 29 |