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(A) Myxoid ground substance accumulation and elastic fragmentation in intima-media (arrowheads indicate adjacent grade III lesion). Movat’s stain was used. (B) Grade III lesion with C. pneumoniae demonstrated by immunohistochemistry (area indicated by arrowheads). (C) Periaortitis, infiltration of aortic adventitia by lymphocytes and macrophages (indicated by star) and unremarkable intima (arrowheads indicate internal elastic lamina).
