Vascular imaging in TIA and

Twenty-one to forty-eight percent of patients with formerly defined TIA have DW images hyperintense lesions, consistent with small infarctions [92-96] (Fig. 7.17). These lesions are usually less than 15 mm in size and are in the clinically appropriate vascular territory. In one... 

The American Heart Association has recently moved to redefine transient ischentic attack (TIA) in a manner similar to cardiac angina, as a transient episode of neurological dysfunction caused by focal brain, spinal cord, or retinal ischemia, withoutacute infarction [92], Previously, it had been known as an acute neurologic deficit of presumed vascular etiology that resolves within 24 h, but a growing body of evidence showed that the definition was too broad and included many DW images-defined infarcts that had missed the window for intervention. 

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