Absolute numbers and relative parts of aneurysms in groups A, B, and C*
| Characteristics | Group A Aneurysms (n = 270) (%) | Group B Aneurysms (n = 39) (%) | Group C Aneurysms (n = 33) (%) |
|---|---|---|---|
| Hunt and Hess grade | |||
| No SAH | 101 (37.4) | 17 (43.6) | 10 (30.3) |
| I | 56 (20.7) | 11 (28.2) | 8 (24.2) |
| II | 32 (11.9) | 6 (15.4) | 4 (12.1) |
| III | 45 (16.7) | 3 (7.7) | 5 (15.2) |
| IV | 17 (6.3) | 0 (0.0) | 1 (3.0) |
| V | 19 (7.0) | 2 (5.1) | 5 (15.2) |
| Initial treatment result | |||
| Complete occlusion (c/o) | 197 (73.0) | 25 (64.1) | 16 (48.5) |
| Neck remnant (n/r) | 49 (18.1) | 10 (25.6) | 8 (24.2) |
| Residual aneurysm (r/a) | 24 (8.9) | 4 (10.3) | 9 (27.3) |
| Aneurysm size | |||
| Small (≤10 mm) and small neck (≤4 mm) | 181 (67.0) | 27 (69.2) | 6 (18.2) |
| Small (≤10 mm) and wide neck (>5 mm) | 41 (15.2) | 1 (2.6) | 11 (33.3) |
| Large (>10 mm) and small neck (≤4 mm) | 10 (3.7) | 0 (0.0) | 4 (12.1) |
| Large (>10 mm) and wide neck (>4 mm) | 38 (14.1) | 11 (28.2) | 12 (36.4) |
| Aneurysm location | |||
| ICA | 59 (21.9) | 10 (25.6) | 6 (18.2) |
| ACA/AcomA | 67 (24.8) | 7 (17.9) | 7 (21.2) |
| MCA | 23 (8.5) | 1 (2.6) | 3 (9.1) |
| PCA/PcomA | 34 (12.6) | 5 (12.8) | 3 (9.1) |
| BA | 65 (24.1) | 15 (38.5) | 14 (42.4) |
| VA | 22 (8.1) | 1 (2.6) | 0 (0.0) |
Note:—ICA indicates internal carotid artery; ACA, anterior cerebral artery; AcomA, anterior communicating artery; MCA, middle cerebral artery; PCA, posterior cerebral artery; PcomA, posterior communicating artery; BA, basilar artery; VA, vertebral artery; SAH, subarachnoid hemorrhage.
* Complete treatment (group A), recurrence without retreatment (group B), and recurrence with retreatment (group C).