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In page Atherosclerosis:

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The plaque is divided into three distinct components:

  1. The atheroma ("lump of gruel", from Greek ἀθήρα (athera) 'gruel'), which is the nodular accumulation of a soft, flaky, yellowish material at the center of large plaques, composed of macrophages nearest the lumen of the artery[citation needed]
  2. Underlying areas of cholesterol crystals[citation needed]