An 87-year-old woman presenting with acute dysarthria, left facial droop, and left-sided weakness. An 87-year-old woman presenting with acute dysarthria, left facial droop, and left-sided weakness. On admission, NCCT and CTP were performed concurrently. A, NCCT shows some microvascular ischemic changes posteriorly. B−D, CTP maps, CBF (B), CBV (C), and MTT (D), demonstrate a large area of matched deficit on CBV and MTT maps, indicative of core infarct in the right MCA territory. Y.W. Lui et al. AJNR Am J Neuroradiol 2010;31:1552-1563 ©2010 by American Society of Neuroradiology