Abstract
Pathology of high risk atherosclerotic plaque provides the basis for understanding the imaging and treatment of atherosclerosis. The earliest vascular change described microscopically are adaptive intimal thickening and fatty streaks, whereas pathologic intimal thickening are the first of the progressive plaques subtypes. Fibroatheromas are characterized by an acellular necrotic core, accumulated cellular debris and cholesterol monohydrate, and a lack of extracellular matrix. The development of the necrotic core is believed to originate from apoptotic macrophages. Thinning of the fibrous cap leads to plaques vulnerable to rupture, or thin-cap fibroatheromas. Overlying thrombosis can arise from one of several mechanisms including ruptures, erosion, or calcified nodules. Calcium within atherosclerosis is a common imaging target which increases with lesion progression and is present in greatest frequent in healed plaque ruptures and fibrous plaques. Thin cap fibroatheromas most frequently contain speckled calcification but may show heavily calcified areas or an absence of calcification. which is not very useful in diagnosing these lesions by calcium-based imaging. Coronary lesions with thrombi in the absence of rupture (erosions) exclusively show stippled or no calcification. Rupture in the absence of calcification is rare. In contrast, diffuse calcification is almost always associated with healed ruptures.
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Nakano, M., Stephen, J., Kramer, M.C.A., Ladich, E.R., Kolodgie, F.D., Virmani, R. (2013). Insights into the Natural History of Atherosclerosis Progression. In: Taylor, A., Villines, T. (eds) Atherosclerosis: Clinical Perspectives Through Imaging. Springer, London. https://doi.org/10.1007/978-1-4471-4288-1_1
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DOI: https://doi.org/10.1007/978-1-4471-4288-1_1
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