🧠 ELAPSS Score (aneurysm growth risk)
Estimate the 3- and 5-year growth risk of an unruptured intracranial aneurysm with the ELAPSS score.
Size carries the most weight (≥ 10 mm = +22).
Paste the link in Slack, Teams, X, or LinkedIn — the preview image comes from this page’s Open Graph card.
When to use
Set follow-up imaging intervals and weigh intervention, using growth as a surrogate for rupture.
How it works
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.
Key points
- 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.
References
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
Frequently asked 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）