Narrowed carotid artery. Coloured 3D computed tomography (CT) scan of the interior of a 59 year old patient's carotid artery, showing stenosis (narrowing). The carotid artery supplies blood to the head. The artery has become narrowed by atheroma, fatty deposits (yellow) that thicken the inner coating of the arteries. Treatment is either with balloon angioplasty or a stent to reopen the artery.
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