Comparison of characteristics of 196 very small aneurysms and 1099 larger aneurysms
| 196 Aneurysms ≤ 3 mm in 187 Patients | 1099 Aneurysms ≥ 4 mm in 1006 Patients | P value | |
|---|---|---|---|
| Female (%) | 136 (73) | 780 (78) | .15 |
| Mean age (y) | 54.7 | 53.0 | .073 |
| Ruptured aneurysms (%) | 149 (76) | 817 (74) | .62 |
| Location (%) | |||
| Anterior cerebral artery | 88 (45) | 355 (32) | .0005 |
| Middle cerebral artery | 20 (10) | 119 (11) | .77 |
| Carotid artery | 46 (24) | 352 (32) | .032 |
| Posterior circulation | 42 (21) | 273 (25) | .267 |
| Procedural mortality (%) | 2 (1.1) | 21 (2.1) | .53 |
| Procedural morbidity (%) | 4 (2.1) | 34 (3.4) | .48 |
| Procedural ruptures (%) | 15 (7.7) | 36 (3.6) | .018 |
| Retreatment rate | 4.6% (9/196) | 10.0% (110/1099) | .023 |
| Additional coiling | 4 | 95 | |
| Additional clipping | 6 | 15 | |
| Supporting devices (%) | 12 (6.1%) | 116 (10.6%) | .070 |
| Balloon | 10 | 81 | |
| Stent | 2 | 19 | |
| TriSpan | 0 | 16 |