Reasons for nonrandomization into ISAT
| Reason | No. (%) of Patients |
|---|---|
| Surgical clipping (n = 67) | |
| Anatomy of aneurysm unsuitable, wide neck | 22 (33) |
| Radiologist decision not suitable for embolization | 13 (19) |
| Intracranial haematoma to be removed at the same time | 8 (12) |
| Aneurysm size unsuitable | 6 (9) |
| Unavailability of radiologist or angiography room | 6 (9) |
| Anatomy, tortuous vessels | 5 (7) |
| Patient requested surgery | 3 (4) |
| Vessel could not be separated from aneurysm neck | 2 (3) |
| Patient pregnant | 1 (1) |
| Management not discussed with neuroradiologist on call | 1 (1) |
| Endovascular coiling (n = 46) | |
| Posterior circulation aneurysm | 18 (39) |
| Patient requested endovascular therapy | 10 (22) |
| Patient age or grade | 7 (15) |
| Surgeon did not believe aneurysm was suitable for clipping | 5 (11) |
| Anatomy unsuitable for surgery | 3 (6) |
| Preexistent medical condition | 1 (2) |
| Aneurysm partially treated | 1 (2) |
| Outside referral after failed clipping | 1 (2) |