Components of the PHASES score14
| PHASES Aneurysm Risk Score | Points |
|---|---|
| (P) Population | |
| North American, European (other than Finnish) | 0 |
| Japanese | 3 |
| Finnish | 5 |
| (H) Hypertension | |
| No | 0 |
| Yes | 1 |
| (A) Age | |
| Younger than 70 yr | 0 |
| 70 yr or older | 1 |
| (S) Size of aneurysm | |
| <7.0 mm | 0 |
| 7.0–9.9 mm | 3 |
| 10.0–19.9 mm | 6 |
| ≥20.0 mm | 10 |
| (E) Earlier SAH from another aneurysm | |
| No | 0 |
| Yes | 1 |
| (S) Site of aneurysm | |
| ICA | 0 |
| MCA | 2 |
| ACA/PcomA/posterior circulation | 4 |
Note:—ACA indicates anterior cerebral arteries (including the anterior cerebral artery, anterior communicating artery, and pericallosal artery); ICA, internal carotid artery; MCA, middle cerebral artery; PcomA, posterior communicating artery; SAH, subarachnoid hemorrhage.