Internal carotid webs
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No sign of recent cerebral infarction or intracranial hemorrhage on non-contrast CT (not shown).
Webs in both extracranial internal carotid arteries at the level of the C2 vertebra. Otherwise, all arteries arising from the aortic arch are patent, as well as the intracranial arteries (not shown).
Internal carotid webs are thin intraluminal membranes that are probably the result of fibromuscular dysplasia. They may may precipitate the formation of thrombi that could potentially embolize and cause ischemic stroke. Carotid webs are quite uncommon, even in patients with anterior circulation stroke. 1