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> > I know a lot of PD patients do not have dementias, so I guess it is not > universal. Does anyone know a physiological explanation of why they > occur in some? > Gail Post There are many forms of Parkinson's syndrome, but the two that stand out are pure Parkinsons (which does not have dementia as a component), and Parkinson's plus (which does). PD+ seems to be the more acute of the two, progresses the most rapidly, and generally affects a senior population. ---- Regards Mary Ann