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Figure 1a. Histologic specimens from the aorta in a 24-year-old man show evidence of cystic medial necrosis. (a) Photomicrograph (original magnification, x40; hematoxylin-eosin stain) shows deposition of mucopolysaccharide (*). (b) Photomicrograph (original magnification, x100; Masson trichrome stain) demonstrates disruption of the elastic lamina.
