A form of arteriosclerosis characterized by the presence of lesions (called plaques) on the innermost layer of the walls of large and medium-sized arteries. The plaques contain lipids, collagen, inflammatory cells, and other substances and can impede blood flow or rupture, leading to serious problems such as heart attack or stroke.
ath′er·o·scle·rotic (-rŏtĭk) adj.
(click for a larger image)atherosclerosis
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