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The Relative Frequency of "Dementia of Unknown Etiology" Increases With Age and Is nearly 50% in Nonagenarians Arch Neurol 57:713-719, Crystal,H.A.,et al, 2000 See this aricle in Pubmed Article Abstract Dementia of unknown etiology accounted for 5% of all cases of dementia among patients dying in their 70s, 21% for patients dying in their 80s, and 48% for patients dying in their 90s. A significant percentage of demented patients older than 80 years do not meet pathological criteria for AD or dementia with Lewy bodies. Hippocampal sclerosis and leukoencephalopathy are common in these patients but rare in clinically nondemented subjects.

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(click to filter results - removes previous filter) dementia dementia,differential diagnosis of dementia,unknown etiology old age,neurology of

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