an accumulation and swelling (-oma) in artery walls that is made up of cells (mostly macrophage cells), or cell debris, that contain lipids (cholesterol and fatty acids), calcium and a variable amount of fibrous connective tissue.an accumulation and swelling (-oma) in artery walls that is made up of cells (mostly macrophage cells), or cell debris, that contain lipids (cholesterol and fatty acids), calcium and a variable amount of fibrous connective tissue.

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