Comparison of cerebral blood flow in the right hemisphere between the symmetric and asymmetric groups, as measured by laser Doppler flowmetry. Among 33 unilateral common carotid artery occlusion-operated mice whose laser Doppler flowmetry and 18Ffluorodeoxyglucose positron emission tomography scan were both taken at 7 days after the operation, six mice exhibited asymmetric increases in glucose uptake within their right hemispheres (i.e., asymmetric group) while twenty seven mice showed a symmetric pattern (symmetric group). Cerebral perfusion tended to be lower in the ipsilesional hemisphere of the asymmetric group, compared to the symmetric group (p=0.059).