ELAPSS Score (aneurysm growth risk)
ELAPSS score for unruptured-aneurysm growth: earlier SAH, location, age, population, size and shape mapped to 3- and 5-year growth risk.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Earlier subarachnoid hemorrhage
- No
- Location of aneurysm
- PCOM / posterior circulation (+5)
- Age
- 72 years
- Population
- Finland (+7)
- Aneurysm size
- 12 mm
- Irregular shape
- Yes
Result: ELAPSS 40/40: aneurysm growth risk ~42.7% at 3 years, ~60.8% at 5 years.
The tool opens with these values already filled in. Replace them with your own.
What the result means
- Risk
- 3-/5-year growth risk rises from about 5.0%/8.4% below 5 points to about 42.7%/60.8% at 25 or more.
What you enter
- Earlier subarachnoid hemorrhage
- Location of aneurysm
- Age
- Population
- Aneurysm size
- Irregular shape (+4)
How this is calculated
- Components
- Earlier SAH (no +1), Location (MCA +3, PCOM/posterior +5), Age (+1 per 5-yr band above 60), Population (Japan +1, Finland +7), Size (+4/+10/+13/+22 by band), Shape (irregular +4); range 0-40.
Backes D, Rinkel GJE, Greving JP, et al. ELAPSS score for prediction of risk of growth of unruptured intracranial aneurysms. Neurology. 2017;88(17):1600-1606. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.