Abstract
Intracranial atherosclerosis is a leading cause of stroke with a high recurrence rate despite treatment. Numerous factors are proposed to influence stroke recurrence due to intracranial atherosclerosis including lesion eccentricity, plaque characteristics, and computational fluid dynamic metrics, such as wall shear stress. An overlooked variable that intrinsically relates to intracranial atherosclerosis is the location of the arterial segment where the lesion occurs. Variations in cerebral blood flow, arterial anatomy, and flow dynamics are likely drivers of initial lesion development and thus likely to influence stroke recurrence. To date, treatment trials of intracranial atherosclerosis have not considered arterial segment lesion location as an independent variable, failing to account for variations in flow dynamics between each artery. There are limited available data on differences between arterial segments, confined to only post hoc analyses. In this review, we summarize available data on such differences between arterial segments. With the limited arterial segment data available, multiple differences in recurrence of stroke in territory of lesion were identified across trials.
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