Version July 2025
| Panel A: ELAPSS risk score | ||
| Aneurysm growth risk score | Points | |
| Earlier subarachnoid hemorrhage | ||
| Yes | 0 | |
| No | 1 | |
| Location of the aneurysm | ||
| ICA/ACA/ACOM | 0 | |
| MCA | 3 | |
| PCOM, vertebrobasilar arteries and branches | 5 | |
| Age | ||
| ≤60 years | 0 | |
| >60 years (per 5 years) | 1 | |
| Population | ||
| North America, China, Europe (other than Finland) | 0 | |
| Japan | 1 | |
| Finland | 7 | |
| Size of the aneurysm (mm) | ||
| 1.0 to 2.9 | 0 | |
| 3.0 to 4.9 | 4 | |
| 5.0 to 6.9 | 10 | |
| 7.0 to 9.9 | 13 | |
| ≥10.0 | 22 | |
| Shape of the aneurysm | ||
| Regular | 0 | |
| Irregular | 4 | |
| Panel B: Predicted 3-year and 5-year risk of aneurysm growth* | ||
| ELAPSS risk score | 3-year risk | 5-year risk |
| <5 | 5.0 | 8.4 |
| 5 to 9 | 7.8 | 13.0 |
| 10 to 14 | 11.7 | 19.3 |
| 15 to 19 | 17.5 | 28.1 |
| 20 to 24 | 25.8 | 39.9 |
| ≥25 | 42.7 | 60.8 |
ACA: anterior cerebral artery; ACOM: anterior communicating artery; CI: confidence interval; ELAPSS: earlier subarachnoid hemorrhage, location of the aneurysm, age >60 years, population, size of the aneurysm, and shape of the aneurysm; ICA: internal carotid artery; MCA: middle cerebral artery; PCOM: posterior communicating artery.
* Data for this table derived from Backes, et al.