Complexity and stability of vortex cores in cerebral aneurysmsa
| Aneurysm | Complexity Simple/Complex | Stability Stable/Unstable |
|---|---|---|
| Smooth wall (n = 25) | 21 (84.0%)/4 (16.0%) | 22 (88.0%)/3 (12.0%) |
| Irregular wall (n = 15) | 6 (40.0%)/9 (60.0%) | 10 (66.7%)/5 (33.3%) |
| P value | .006 (S) | .126 (NS) |
Note:—NS indicates not significant; S, significant on the Fisher exact test.
↵a Simple and complex flow patterns were defined as exhibiting a single vortex core or multiple or nonvisualized vortex cores through the cardiac cycle, respectively. Stable and unstable flow patterns were defined as exhibiting persistent vortex cores or moving or nonvisualized vortex cores, respectively. The designation of “irregular wall” was recorded when the wall had protruding blebs or daughter sacs. Differences of P < .05 were considered significant.