Anatomic configuration
| A1 Configuration | Aneurysms | Controls (n = 159) | |
|---|---|---|---|
| AcomAa (n = 105) | Non-AcomA (n = 123) | ||
| Symmetric | 32 (31%) | 109 (89%) | 122 (77%) |
| Dominant | 42 (40%) | 10 (8%) | 21 (13%) |
| Complete | 31 (29%) | 4 (3%) | 16 (10%) |
| Dominant + Complete | 73 (69%) | 14 (11%) | 37 (23%) |
a All cases observed had aneurysms fed by the dominant vessel.