[A case of binswanger-type dementia with bilateral temporoparietal hypoperfusion in SPECT].

We report a case of Binswanger-type dementia demonstrated bilateral temporoparietal hypoperfusion in SPECT with 123I-IMP. The perfusion pattern in the present case was different from those previously obtained in SPECT or PET studies of patients with Binswanger-type dementia, and was similar to regional abnormalities in patients with Alzheimer-type dementia. Temporoparietal hypoperfusion in this case is likely to be mediated by neuronal mechanisms via projection fibers as a result of the deep white matter lesions in the temporoparietal area. A decreased perfusion or metabolism in the temporoparietal area is considered to be a characteristic in patients with Alzheimer-type dementia, however, we should keep in mind that other cerebral disorders may also show a similar perfusion pattern.