Aneurysm location
| Overall | Group A | Group B | ||||
|---|---|---|---|---|---|---|
| Location | N | % | N | % | N | % |
| Anterior circulation | 333 | (83.3) | 263 | (83.5) | 70 | (82.4) |
| Cavernous segment of ICA | 7 | (1.8) | 5 | (1.6) | 2 | (2.4) |
| Siphon of ICA | 67 | (16.8) | 54 | (17.1) | 13 | (15.3) |
| PcomA | 77 | (19.3) | 59 | (18.7) | 18 | (21.2) |
| AchoA | 15 | (3.8) | 12 | (3.81) | 3 | (3.5) |
| ICA bifurcation | 10 | (2.5) | 10 | (3.2) | 0 | (0) |
| AcomA | 83 | (20.8) | 67 | (21.3) | 16 | (18.8) |
| ACA | 27 | (6.8) | 18 | (5.7) | 9 | (10.6) |
| MCA | 47 | (11.8) | 38 | (12.1) | 9 | (10.6) |
| Posterior circulation | 67 | (16.7) | 52 | (16.5) | 15 | (17.6) |
| BA bifurcation | 38 | (9.5) | 29 | (9.2) | 9 | (10.6) |
| SCA | 14 | (3.5) | 10 | (3.2) | 4 | (4.7) |
| PICA | 3 | (0.8) | 2 | (0.6) | 1 | (1.2) |
| PCA | 4 | (1.0) | 3 | (1.0) | 1 | (1.2) |
| BA trunk | 3 | (0.8) | 3 | (1.0) | 0 | (0) |
| VA | 5 | (1.3) | 5 | (1.6) | 0 | (0) |
ACA, anterior cerebral artery; AchoA, anterior choroidal artery; AcomA, anterior communicating artery; BA, basilar artery; ICA, internal carotid artery; MCA, middle cerebral artery; PCA, posterior cerebral artery; PcomA, posterior communicating artery; PICA, posterior inferior cerebral artery; SCA, superior cerebral artery; VA, vertebral artery.