Patient characteristics
| Characteristic | N=27 |
| Age (years) | 49.8±11.9 years |
| Sex | |
| Female | 19 (70.4%) |
| Male | 8 (29.6%) |
| Side | |
| Right | 13 (48.1%) |
| Left | 14 (51.9%) |
| Symptom | |
| Headache | 16 (59.3%) |
| Dizziness | 10 (37.0%) |
| Unconsciousness | 7 (25.9%) |
| Focal neurologic deficit | 3 (11.1%) |
| No symptom | 1 (3.7%) |
| Rupture history | |
| Unruptured | 14 (51.9%) |
| Ruptured | 13 (48.1%) |
| No of PICA aneurysms | |
| Single | 25 (92.6%) |
| Multiple | 2 (7.4%) |
PICA, posterior inferior cerebellar artery.