Aneurysm location
| Aneurysm Location | Group A | Group B | Total |
|---|---|---|---|
| Anterior circulation | 98 (84) | 40 (91) | 138 (86) |
| Internal carotid artery | 46 | 23 | 69 |
| Paraclinoid | 12 | 13 | 25 |
| PcoA | 24 | 10 | 34 |
| AchA | 2 | 0 | 2 |
| Bifurcation | 8 | 0 | 8 |
| Anterior cerebral artery | 39 | 8 | 47 |
| Middle cerebral artery | 13 | 9 | 22 |
| Posterior circulation | 18 (16) | 4 (9) | 22 (14) |
| Posterior cerebral artery | 2 | 0 | 2 |
| Basilar artery | 12 | 4 | 16 |
| Superior cerebellar artery | 1 | 0 | 1 |
| PICA | 3 | 0 | 3 |
| Total | 116 | 44 | 160 |
Note.—PcoA indicates posterior communicating artery; AchA, anterior choroidal artery; PICA, posterior inferior cerebellar artery.
Data are number (%) of aneurysms.