ELAPSS Score (aneurysm growth risk) — free guideline decision tool
Estimate the 3- and 5-year growth risk of an unruptured intracranial aneurysm with the ELAPSS score.
Open guideline tool →Guideline-based
Implements the decision logic from published clinical guidelines.
Runs in your browser
No installation. Enter the patient's values and get a guideline recommendation instantly.
Data stays local
Nothing is uploaded. Results are for licensed clinicians only.
Worked calculation
The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.
| Earlier SAH history | No SAH history |
|---|---|
| Location | ICA |
| Age | ≤ 60 y |
| Population | North America/Europe · China/other (baseline 0) |
| Maximum aneurysm diameter | < 3.0 mm |
| Shape | Regular |
→ELAPSS total1/40 · Lower growth risk
- Earlier SAH E：No SAH history +1
- Location L：ICA 0
- Age A：≤ 60 0
| Earlier SAH history | Prior SAH history |
|---|---|
| Location | ACA/Pcom/posterior circulation |
| Age | > 60 y |
| Population | Finnish |
| Maximum aneurysm diameter | ≥ 10 mm |
| Shape | Irregular/lobulated |
→ELAPSS total39/40 · Higher growth risk
- Earlier SAH E：Prior SAH history 0
- Location L：ACA/Pcom/posterior circulation +5
- Age A：> 60 +1
Common questions
What is ELAPSS Score (aneurysm growth risk)?
Estimate the 3- and 5-year growth risk of an unruptured intracranial aneurysm with the ELAPSS score.
How is ELAPSS Score (aneurysm growth risk) calculated? What is the core formula?
Points from Earlier SAH, Location, Age > 60, Population, Size and Shape (0–40). Higher totals indicate higher 3/5-year growth risk; read exact percentages from the nomogram.
When is ELAPSS Score (aneurysm growth risk) used?
Set follow-up imaging intervals and weigh intervention, using growth as a surrogate for rupture.
What are the key clinical points for ELAPSS Score (aneurysm growth risk)?
Size carries the most weight (≥ 10 mm = +22). Total ≥ 12 corresponds to > 10% 5-year growth risk. More robust combined with PHASES, wall enhancement and morphology.
What are the limits and cautions when using ELAPSS Score (aneurysm growth risk)?
For licensed clinicians and clinical researchers. Interpret results with history, investigations and local protocols; not a diagnosis or prescription, and not a substitute for multidisciplinary decision-making or local guidelines.
How is ELAPSS Score (aneurysm growth risk) calculated in practice? Can you show a worked example?
Inputs: Earlier SAH history No SAH history, Location ICA, Age ≤ 60 y, Population North America/Europe · China/other (baseline 0), Maximum aneurysm diameter < 3.0 mm, Shape Regular → Result: ELAPSS total 1 /40 · Lower growth risk（Earlier SAH E: No SAH history +1, Location L: ICA 0, Age A: ≤ 60 0） Inputs: Earlier SAH history Prior SAH history, Location ACA/Pcom/posterior circulation, Age > 60 y, Population Finnish, Maximum aneurysm diameter ≥ 10 mm, Shape Irregular/lobulated → Result: ELAPSS total 39 /40 · Higher growth risk（Earlier SAH E: Prior SAH history 0, Location L: ACA/Pcom/posterior circulation +5, Age A: > 60 +1）
Run ELAPSS Score (aneurysm growth risk) now
Estimate the 3- and 5-year growth risk of an unruptured intracranial aneurysm with the ELAPSS score.
Open guideline tool →For licensed clinicians. Not a substitute for clinical judgement.
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