| Group | No. of Patients (n = 101) | Location of an aneurysm |
| Vertebral Artery | 12 | Vertebral artery and PICA |
| Middle cerebral artery | 24 | MCA |
| Pericallosal artery | 11 | Pericallosal arteries |
| Anterior communicating artery complex | 54 | Anterior communicating artery, A1 and A2 |