Consensus Grading Scale for Endovascular Aneurysm Occlusion
| Gradea,b | Definition |
|---|---|
| 0 | Complete aneurysm occlusion |
| 1 | 90% or greater aneurysm occlusion |
| 2 | 70–89% aneurysm occlusion |
| 3 | 50–69% aneurysm occlusion |
| 4 | 25–49% aneurysm occlusion |
| 5 | Less than 25% aneurysm occlusion |
a The modifier “I” may be used to describe interstitial opacification within the confines of the coil mass.
b The modifier “G” may be used to describe interval growth in the overall dimensions of the aneurysm as a separate phenomenon from coil compaction with recanalization of the aneurysm.