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Alois Alzheimer (1864-1915), German neurologist. Alzheimer described the signs and pathology of the commonest form of dementia, now known as Alzheimer's Disease. This is typically a senile dementia, and involves changes in brain structure which were not observable until after death. Modern diagnostic techniques, such as MRI and CAT scanning and electroencephalography, are now able to chart the progress of the condition from an early stage, although brain biopsy is still the only certain method of diagnosis.
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