Aneurysm characteristics and location
| In situ thrombosis | Control | P values | |
| Size (average) (mm) | 8.41±6.19 | 6.85±5.55 | 0.0952 |
| Anterior circulation | 34 (91.9%) | 652 (92.5%) | 0.9184 |
| Internal carotid | 27 (72.9%) | 522 (74.0%) | 0.8851 |
| Cervical | 0 | 16 | – |
| Petrous | 0 | 6 | – |
| Cavernous | 7 | 66 | – |
| Clinoidal | 0 | 22 | – |
| Ophthalmic | 3 | 125 | – |
| Paraophthalmic | 8 | 177 | – |
| Posterior communicating/ Anterior choroidal | 7 | 94 | – |
| Superior hypophyseal | 1 | 7 | – |
| Termination | 1 | 9 | – |
| Beyond ICA | 7 (18.9%) | 129 (18.3%) | 0.3173 |
| Anterior communicating | 1 | 50 | – |
| A1-2 | 2 | 32 | – |
| A2-3 | 1 | 11 | – |
| M1 | 0 | 10 | – |
| M2 | 1 | 4 | – |
| Bifurcation | 2 | 22 | – |
| Posterior circulation | 3 (8.1%) | 54 (7.7%) | 0.9204 |
| Basilar | 2 | 12 | – |
| Superior cerebellar artery | 1 | 1 | – |
| Posterior cerebral artery | 0 | 6 | – |
| Vertebral | 0 | 26 | – |
| Posterior inferior cerebellar artery | 0 | 9 | – |
ICA, internal carotid artery.