Small-aneurysm Roy score distribution for initial result and subsequent follow-up angiograms
| Initial Roy Grade | No. Aneurysms with Initial Result (%) | Class 1 on Follow-Up (%) | Class 2 on Follow-Up (%) | Class 3 on Follow-Up (%) | Recurrence (%) |
|---|---|---|---|---|---|
| Class 1: complete occlusion | 45 (57.0) | 35 (77.8) | 7 (15.6) | 3 (6.7) | 10 (22.2) |
| Class 2: residual neck | 25 (31.6) | 14 (56.0) | 9 (36.0) | 2 (8.0) | 2 (8.0) |
| Class 3: residual aneurysm | 9 (11.4) | 4 (44.4)* | 3 (33.3) | 2 (22.2) | 2 (22.2) |
| Total | 79 (100) | 53 (67.1) | 19 (24.1) | 7 (75.9) | 14 (17.7) |
* One of these 4 patients had parent-vessel occlusion on the follow-up angiogram, which was graded as Roy class 1.