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Carotid web in the right internal carotid artery. A semi-circular non-calcified thin lesion is seen protruding in the lumen from the posterior wall of the artery (arrow in a). No calcification or thrombus can be seen, as further illustrated in the detailed image (b). Some authors consider a carotid web to be a variant of fibromuscular dysplasia. A carotid web may induce flow stasis with thrombus formation, hence increasing the risk of stroke
