Review Article
Unruptured Cerebral Aneurysms: Evaluation and Management
Table 1
PHASES aneurysm risk score [
11].
| Population | | North American or European (except Finnish) | 0 point | Japanese | 3 points | Finnish | 5 points | Hypertension | | No | 0 point | Yes | 1 point | Age | | Less than 70 years | 0 point | Greater than or equal to 70 years | 1 point | Size of aneurysm | | Less than 7.0 mm | 0 point | 7.0 mm–9.9 mm | 3 points | 10.0 mm–19.9 mm | 6 points | Greater than or equal to 20 mm | 10 points | Earlier subarachnoid hemorrhage from another aneurysm | | No | 0 point | Yes | 1 point | Site of aneurysm | | Internal carotid artery | 0 point | Middle cerebral artery | 2 points | Others like anterior cerebral artery, posterior communicating | 4 points | artery, or posterior circulation aneurysms | PHASES risk score | 5-year risk of aneurysm rupture | Less than or equal to 2 | 0.4% | 3 | 0.7% | 4 | 0.9% | 5 | 1.3% | 6 | 1.7% | 7 | 2.4% | 8 | 3.2% | 9 | 4.3% | 10 | 5.3% | 11 | 7.2% | Greater than or equal to 12 | 17.8% |
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