Coronary artery stenosis. Coloured angiogram showing narrowing of a coronary artery. The box (upper left) highlights the site of the narrowing (stenosis). The arteries are on the surface of the heart, and supply the heart muscle with blood. This stenosis is caused by deposits of fatty material on the artery walls, usually due to high blood cholesterol levels, and leads to atherosclerosis. Atherosclerosis of coronary arteries impedes blood flow to the heart, and stops the muscle getting the oxygen it needs to function. This leads to angina pectoris (chest pain on exertion), or even to a heart attack.
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