Table 2.

Aneurysmal sac inner surface score (adapted from Kataoka et al. [41])

Score	Histological observations
0	Normal endothelial cell layer inside the aneurysmal sac, possible adhesion of few leukocytes
1	Endothelial cells with various shapes, intercellular filaments and wider intercellular gaps
2	Damaged endothelial cell layer at some locations with blood cells adhesion
3	Extended damages of the endothelial cell layer and more blood cells adhesion
4	Extensive endothelial cell layer damages with blood cells adhesion
5	Almost entire endothelial cell layer damaged and covered with blood cells and a fibrin network