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Age-specific prevalence of extracranial and intracranial stenosis
(A) 50–99% symptomatic, asymptomatic, and no intracranial stenosis. (B) Proximal extracranial internal carotid artery stenosis, extracranial vertebral artery stenosis, 50–99% intracranial stenosis, and any stenosis (extracranial or intracranial).
