Immediate and follow-up results of the aneurysms treated with WEB 17 according to the 5-point scale of Caroff et al2,a
| Grade No. | Immediate | Ratio (%) | 3-Month Follow-Up | Ratio (%) | 12-Month Follow-Up | Ratio (%) | |||
|---|---|---|---|---|---|---|---|---|---|
| 124 | 100.0% | 92 | 74.2% | 41 | 33.1% | ||||
| 1 | 23 | 18.6% | 20.2% | 62 | 67.4% | 76.1% | 29 | 70.8% | 78.0% |
| 2 | 2 | 1.6% | 8 | 8.7% | 3 | 7.3% | |||
| 3 | 2 | 1.6% | 70.9% | 11 | 12.0% | 20.7% | 6 | 14.6% | 17.1% |
| 4 | 86 | 69.4% | 8 | 8.7% | 1 | 2.4% | |||
| 5 | 11 | 8.8% | 8.9% | 3 | 3.2% | 3.2% | 2 | 4.9% | 4.9% |
↵a Grade 1: no residual flow in aneurysm/WEB 17; grade 2: opacification of the proximal recess of WEB 17; grade 3: neck remnant; grade 4: residual flow inside the WEB 17; grade 5: aneurysm remnant. Grades 1–2 are summarized as complete occlusion, grades 3 and 4 indicate a neck remnant or flow inside the WEB, and grade 5 represents an aneurysm remnant.