ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Atherosclerosis in neck arteries. The scan shows the carotid blood vessels in posterior (rear) view. The irregular appearance of the arterial walls, and areas of narrowing (three areas marked with arrows), indicate the presence of atheromatous plaques, deposits of cholesterol and fats on the blood vessel walls. This narrowing (stenosis) is a risk factor for strokes.
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