Acute middle cerebral arterial embolus
Right sided weakness
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Acute left middle cerebral arterial embolus seen as a filling defect on arterial phase. No established infarct on non-contrast CT. Perfusion shows increased TTP without decreased CBV indicating this is ischemic brain that is not yet infarcted.
CT perfusion in ischemic stroke has become established in most centers with stroke services as an important adjunct, along with CT angiography, to conventional imaging of the brain with a non-contrast CT scan.