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Figure 3 Photomicrographs of a thin cap fibroatheroma in a human coronary artery. (A) An old rupture of the fibrous cap overlying a large necrotic core (NC) is shown (arrow) (section stained with hematoxylin-eosin). (B) Adjacent section stained with oil red O to demonstrate the presence of lipids within the arterial wall. Note that increased staining is noted throughout the lesion both in the area of the NC as well as the fibrous cap (box). (C, D) Higher magnifications of boxed areas seen in A and B. Panel C shows foam cells within the thin fibrous cap stained with hematoxylin-eosin, whereas panel D shows oil red O staining. This artery was correctly identified as a thin cap fibroatheroma by magnetic resonance imaging.