APOGEE / SCIENCE PHOTO LIBRARY APOGEE / SCIENCE PHOTO LIBRARY
A sonogram showing Atherosclerosis of the left common carotid artery. The plaque (yellow) on the wall of the artery can become unstable and rupture, resulting in a blood clot. An embolus can result if the clot moves, and can lodge in the brain, resulting in a stroke or heart attack.
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