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Left cerebellar and mesencephalic ischaemic changes recognised as core and penumbra, respectively, on CBV (a) and MTT (b) colour-coded CT perfusion 4D maps; the presence of ischaemic core was confirmed by DWI-MRI performed immediately after to better evaluate the involvement of mesencephalon; the automatic RAPID mismatch map (d) accurately depicted the extent of ischaemic core and penumbra
