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Figure 1: Perfusion CT undertaken 90 min after onset of the neurological symptoms shows large area of hypoperfusion (increased mean transit time) in the left temporo-occipital region—not corresponding to any vascular system (a-b, arrowheads). Arterial spin labelling sequence MRI brain undertaken 12 hours later when patient only had migrainous headache shows diffuse hyperperfusion in left hemisphere (c-d, arrowheads). Diffusion-weighted imaging sequence shows recent infarcts in the left middle cerebral artery territory (e-f, arrows)

Figure 1: Perfusion CT undertaken 90 min after onset of the neurological symptoms shows large area of hypoperfusion (increased mean transit time) in the left temporo-occipital region—not corresponding to any vascular system (a-b, arrowheads). Arterial spin labelling sequence MRI brain undertaken 12 hours later when patient only had migrainous headache shows diffuse hyperperfusion in left hemisphere (c-d, arrowheads). Diffusion-weighted imaging sequence shows recent infarcts in the left middle cerebral artery territory (e-f, arrows)