Fig. 5

Histological analysis of the aneurysmal wall. (a, a’): hematoxylin-eosin staining (1.25x, 20x, and scale bar = 1 mm, 100 μm, respectively). (b, b’): The existence of an elastic fiber was evaluated by Elastica van Gieson staining (1.25x, 20x, and scale bar = 1- mm, 100 μm, respectively), with no evidence of an absent elastic fiber