Summary of baseline characteristics
| Characteristics | |
|---|---|
| No. of patients | 788 |
| Age (mean) (yr) | 41.3 ± 19.9 |
| Male (No.) (%) | 471 (59.8%) |
| Clinical presentation (No.) (%) | |
| Hemorrhage | 548 (69.5%) |
| NHND | 130 (16.5%) |
| Asymptomatic | 110 (14.0%) |
| Preprocedural mRS (No.) (%) | |
| 0 | 562 (71.3%) |
| 1 | 84 (10.7%) |
| 2 | 44 (5.6%) |
| 3 | 34 (4.3%) |
| 4 | 27 (3.4%) |
| 5 | 15 (1.9%) |
| Unknown | 22 |
| Spetzler-Martin grade (No.) (%) | |
| I | 136 (17.3%) |
| II | 273 (34.6%) |
| III | 224 (28.4%) |
| IV | 98 (12.4%) |
| V | 21 (2.7%) |
| Unknown | 36 (4.6%) |
| Size (No.) (%) | |
| <3 cm | 443 (56.2%) |
| 3–6 cm | 278 (35.3%) |
| >6 cm | 38 (3.8%) |
| Deep venous drainage (No.) (%) | 438 (55.6%) |
| Eloquence (No.) (%) | 318 (40.4%) |
| Location (No.) (%) | |
| Cortical | 574 (72.8%) |
| Deep | 35 (4.4%) |
| Cerebellum | 126 (16.0%) |
| Brain stem | 17 (2.2%) |
| Others | 36 (4.6%) |
| Associated aneurysm (No.) (%) | 146 (18.5%) |
| Flow-related | 92 (11.7%) |
| Intranidal | 45 (5.7%) |
| Unrelated | 9 (1.1%) |
| Abnormality of drainage route (No.) (%) | |
| Occlusion | 12 (1.5%) |
| Stenosis | 92 (11.7%) |
| Varix | 186 (23.6%) |
Note:—NHND indicates nonhemorrhagic neurologic deficit.