Initial and follow-up Modified Raymond–Roy Class designations in 345 patients with intracranial aneurysms treated with coil embolization
| I | II | IIIa | IIIb | Total | ||
|---|---|---|---|---|---|---|
| First follow-up occlusion class (6.6 months*) | ||||||
| Initial occlusion class, n (%) | I | 71 (88.8) | 7 (8.8) | 1 (1.3) | 1 (1.3) | 80 |
| II | 25 (25.5) | 63 (64.3) | 3 (3.1) | 7 (7.1) | 98 | |
| IIIa | 50 (59.5) | 21 (25.0) | 9 (10.7) | 4 (4.8) | 84 | |
| IIIb | 17 (20.5) | 5 (6.0) | 2 (2.4) | 59 (71.1) | 83 | |
| Total | 163 | 96 | 15 | 71 | 345 | |
| Last follow-up occlusion class† (11.9 months*) | ||||||
| Initial occlusion class, n (%) | I | 66 (82.5) | 9 (11.3) | 0 | 5 (6.3) | 80 |
| II | 25 (25.5) | 57 (58.2) | 1 (1.0) | 15 (15.3) | 98 | |
| IIIa | 45 (53.6) | 24 (28.6) | 8 (9.5) | 7 (8.3) | 84 | |
| IIIb | 16 (19.2) | 6 (7.2) | 1 (1.2) | 60 (72.2) | 83 | |
| Total | 152 | 96 | 10 | 87 | 345 | |
| Last follow-up occlusion class‡ (37.6 months*) | ||||||
| Initial occlusion class, n (%) | I | 35 (76.1) | 6 (13.0) | 0 | 5 (10.9) | 46 |
| II | 10 (19.6) | 28 (54.9) | 0 | 13 (25.5) | 51 | |
| IIIa | 17 (42.5) | 14 (35.0) | 2 (5.0) | 7 (17.5) | 40 | |
| IIIb | 6 (13.3) | 3 (6.7) | 0 | 36 (80.0) | 45 | |
| Total | 68 | 51 | 2 | 61 | 182 | |
*Median.
†Includes all patients.
‡Excludes patients with only one follow-up angiogram.