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 Indian J Med Microbiol  
 

Figure 5: A 59-year-old man with a history of chronic right hemispheric ischemia. Time-resolved CTA (A) shows right internal carotid artery occlusion (arrows). Before external carotid artery (ECA)-internal carotid artery (ICA) bypass surgery, the acetazolamide test done with whole brain CT (B-E) perfusion shows an increase in CBF (arrows in D) and no change in CBV before (B and C) and after (D and E) injection of acetazolamide. This is much more pronounced in the right cerebral hemisphere (arrows in D), suggestive of a good cerebral vascular reserve. His symptoms improved following bypass surgery

Figure 5: A 59-year-old man with a history of chronic right hemispheric ischemia. Time-resolved CTA (A) shows right internal carotid artery occlusion (arrows). Before external carotid artery (ECA)-internal carotid artery (ICA) bypass surgery, the acetazolamide test done with whole brain CT (B-E) perfusion shows an increase in CBF (arrows in D) and no change in CBV before (B and C) and after (D and E) injection of acetazolamide. This is much more pronounced in the right cerebral hemisphere (arrows in D), suggestive of a good cerebral vascular reserve. His symptoms improved following bypass surgery