These studies show moderate hypoperfusion of the prefrontal lobes. There is also a small focal zone of severe hypoperfusion located at the left superior parietal lobe. Left cerebral hemisphere perfusion is generally mildly reduced compared to right possibly due to diaschisis from this zone of focal intense hypoperfusion. There is also an unexpected increase in perfusion seen at the left anterior temporal pole mesial cortex. Perfusion of the brainstem and cerebellum and basal ganglia is normal.