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SPECT shows the inadequate vascular reservoir function in the territory of the left MCA, including the basal ganglia and cerebral cortex (A: resting state, B: after acetazolamide injection). After the extracranial-intracranial bypass surgery, brain MRI shows improvement in perfusion of the left MCA territory [C: cerebral blood volume (CBV), D: cerebral flood flow (CBF), E: time to peak (TTP)]. SPECT: Single photon emission computed tomography, MCA: middle cerebral artery.
