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Fig. 4 —67-year-old woman (patient 28) with large perfusion
abnormality in entire territory of posterior circulation. Cerebral blood
volume (CBV) increases in brainstem, cerebellum, thalamus, and occipital lobes
bilaterally (arrows), whereas cerebral blood flow (CBF) is near
normal (arrows). Mean transit time (MTT) and time to peak (TTP) are
prolonged (arrows). Twenty-millimeter-coverage perfusion CT at level
of basal ganglia detected lesion at thalamus and occipital lobes only.
Follow-up MR angiography (MRA) and diffusion-weighted imaging (DWI) show
occlusion of basilar artery and both posterior cerebral arteries
(arrow) and small acute infarction in right pons (arrow),
respectively.
