If dementia occurs within about one year of the onset of Parkinson's disease, the diagnosis is

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Dementia with Lewy bodies is a type of dementia that can occur in people with Parkinson's disease within about one year of onset. The symptoms of dementia with Lewy bodies can be similar to those of Alzheimer's disease and Parkinson's disease, with additional features such as hallucinations and fluctuating cognition. The diagnosis is made based on a combination of clinical symptoms and imaging studies such as MRI or PET scans. Vascular dementia, Huntington's disease, and Wernicke-Korsakoff syndrome are not typically associated with Parkinson's disease.

If Dementia Occurs Within About One Year of the Onset