Fig. 4

Microscopic findings of reticulum stained aortic wall of aneurysmal part of the excised aortic root, demonstrating a luminal formation within tunica media (black asterisk) with patchy fragmentation, splitting, and destruction of reticulum fibers in the tunica media (black arrow). There is an extensive patchy pale area in the tunica media which show the absence of the reticulum tissue (white arrow) (Reticulum stain, A*40, B*100, C*200, D*400)