PHASES Score (aneurysm rupture risk)
PHASES score (Greving 2014): 5-year cumulative rupture risk of an unruptured intracranial aneurysm from population, hypertension, age, aneurysm size, earlier SAH, and site (total 0–22).
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Population
- Finnish (+5)
- Hypertension
- Yes
- Age
- 72 years
- Aneurysm size
- 12 mm
- Earlier SAH from a different aneurysm
- Yes
- Aneurysm site
- ACA / Pcom / posterior circulation (+4)
Result: PHASES 18/22: 5-year cumulative rupture risk ~17.8%.
The tool opens with these values already filled in. Replace them with your own.
What the result means
- Risk
- 5-year rupture risk rises from about 0.4% at <= 2 points to about 17.8% at >= 12.
What you enter
- Population
- Hypertension (+1)
- Age
- Aneurysm size
- Earlier SAH from a different aneurysm (+1)
- Aneurysm site
How this is calculated
- Components
- Population (0/+3/+5), Hypertension (+1), Age >= 70 (+1), Size (< 7.0 mm 0, 7.0-9.9 +3, 10.0-19.9 +6, >= 20 +10), Earlier SAH (+1), Site (ICA 0, MCA +2, ACA/Pcom/posterior +4); total 0-22.
Greving JP, Wermer MJH, Brown RD Jr, et al. Development of the PHASES score for prediction of risk of rupture of intracranial aneurysms: a pooled analysis of six prospective cohort studies. Lancet Neurol. 2014;13(1):59-66. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.