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Published online by Cambridge University Press: 21 November 2024
Transient ischemic attacks (TIAs) are characterized as transient focal neurological episodes, usually lasting only minutes, which correspond with a vascular territory and resolve spontaneously leaving no permanent clinical sign or observable changes on neuroimaging. These episodes can theoretically involve any cerebrovascular territory. The mechanism behind TIAs is thought to be either hypoperfusion of a vascular territory due to reduced blood flow in the setting of focal vascular stenosis or an embolic particle that dissolves shortly after occluding a vessel.
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