Coloured 3D computed tomography (CT) angiogram scan showing carotid arteries affected by atherosclerosis. Atherosclerosis is a condition in which an artery wall thickens as a result of accumulations (atheromas) of fatty materials such as cholesterol. Such narrowing of blood vessels raises blood pressure and is a risk factor for strokes.

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Photo credit: © VSEVOLOD ZVIRYK/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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