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Type I–II: near-normal wall thickness, no calcification, not visible because of limited spatial resolution
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Type III: intimal thickening with no calcification or small eccentric plaque without calcification
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Type IV–V: plaque with a lipid or necrotic core surrounded by fibrous tissue with possible calcification
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Type VI: complex plaque with possible surface defect, hemorrhage, or thrombus
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Type VII: calcified plaque without features of VI
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Type VIII: fibrotic plaque without lipid core and with possible small calcifications without features of VI
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