5-Year Aneurysm Rupture Risk Assessment
Population
North American/European (non-Finnish)
Standard population risk
Japanese
Higher baseline risk
Finnish
Highest population risk
Hypertension
No
Normal blood pressure
Yes
Diagnosed hypertension
Age
< 70 years
Lower age-related risk
≥ 70 years
Higher age-related risk
Size of Aneurysm
< 7.0 mm
Small aneurysm
7.0-9.9 mm
Medium aneurysm
10.0-19.9 mm
Large aneurysm
≥ 20.0 mm
Giant aneurysm
Earlier SAH
No previous subarachnoid hemorrhage
History of SAH from another aneurysm
Site of Aneurysm
Internal carotid artery (ICA)
Lowest site-related risk
Middle cerebral artery (MCA)
Moderate site-related risk
ACA/PComm/Posterior circulation
Highest site-related risk
5-Year Rupture Risk: 0.4%
Low Risk
Clinical Recommendations
• Score ≤2: Consider conservative management with regular monitoring
• Score 3-6: Individual risk assessment needed; consider patient factors
• Score 7-11: Consider intervention based on patient factors
• Score ≥12: Strong consideration for intervention
Validated only in North American, European, Japanese, and Finnish populations. Use clinical judgment in conjunction with score results.
Last Comprehensive Review: 2026
