Abstract
Vascular dementia (VaD) is increasingly recognised to reflect an outmoded concept in that it identifies cases too late for preventive therapy to have an opportunity to prevent the development of dementia and uses a cognitive paradigm inappropriately based on Alzheimer's disease. A replacement is urgently required and a new concept, that of vascular cognitive impairment (VCI), has been proposed to meet this need. It is imperative that criteria for VCI are developed on the basis of knowledge and data rather than supposition and assumption, as was the case for VaD. This review details the state of knowledge that we have now reached concerning the fundamental points of severity and cognitive paradigm and also covers a number of other imaging-related essential points embracing atrophy, leukoaraiosis, infarct volume and infarct location. Finally, the increasingly important concept of mixed dementia (co-existent Alzheimer's disease and VCI) is discussed.
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