Pathology of internal carotid artery dissection

Elastica van Gieson stain of specimens from a 61-year-old man with internal carotid artery dissection and fibromuscular dysplasia.
(A) Postmortem exposition of intramural hematoma of the right internal carotid artery above the bifurcation (arrow).
(B) Cross-section of the dissected artery shows subintimal and intramedial hematoma (small arrows).
(C) Longitudinal section with zipper-like separation within the arterial wall (large arrow) corresponding to the false lumen and myxoid degeneration of the media (small arrows).