Characteristics of patient population
| Number of Patients (%) | |
|---|---|
| Age | |
| <40 yr | 32 (14.7) |
| 40–69 yr | 149 (68.7) |
| ≥70 yr | 36 (16.6) |
| Mean | 54.2 yr |
| Range | 13–83 yr |
| Sex | |
| Female | 167 (77) |
| Male | 50 (23) |
| Classification | |
| Group 1, incidental | 118 (54.4) |
| Group 2, mass effect | 51 (23.5) |
| Group 3, tumor/AVM | 12 (5.5) |
| Group 4, chronic SAH | 17 (7.8) |
| Group 5, acute SAH | 19 (8.8) |
| Grade I | 4 |
| Grade II | 9 |
| Grade III | 5 |
| Grade IV | 1 |
| Grade V | 0 |
| Indication for endovascular treatment | |
| Surgically difficult | 68 (31.3) |
| Failed clipping | 17 (7.8) |
| Refusal of surgery | 37 (17.1) |
| Elderly plus poor medical condition | 54 (24.9) |
| Information not available | 41 (18.9) |
Note.—AVM indicates arteriovenous malformation; SAH, subarachnoid hemorrhage.