Table 7.
Histological characteristics of aneurysmal wall from 3 cohorts of patients coming from Japan, Finland and Switzerland. The values come from the articles published by Kataoka et al. [41] (Japanese patients), Frösen et al. [21] (Finnish patients), and Morel et al. [55] (Swiss patients). Definitions of each score or wall type are given in Tables 2, 3, 4, 5
| Cohorts and wall characteristics | Unruptured IA | Ruptured IA |
|---|---|---|
| Japanese patients | N = 27 | N = 44 |
| Aneurysmal sac inner surface score | 0.8 | 3.7 |
| Aneurysmal structural wall score | 1.7 | 3.7 |
| Aneurysmal wall inflammatory cell invasion score | 0.8 | 2.2 |
| Finnish patients | N = 24 | N = 42 |
| Endothelial lining absent | 7/23 (30%) | 25/40 (62%) |
| Wall type A | 10 (42%) | 7 (17%) |
| Wall type B | 9 (37%) | 9 (21%) |
| Wall type C | 5 (21%) | 11 (26%) |
| Wall type D | 0 (0%) | 15 (36%) |
| Swiss patients | N = 31 | N = 17 |
| Endothelial cells covering the aneurysmal wall | 2.2 to 91.1% | 7.1 to 52.8% |
| Wall type A | 5 (16%) | 0 (0%) |
| Wall type B | 17 (55%) | 3 (18%) |
| Wall type C | 8 (26%) | 12 (70%) |
| Wall type D | 1 (3%) | 2 (12%) |