The diagnosis of dementia associated with PD is a two-step process. The first step involves exclusion of other causes of mental dysfunction and an evaluation of how much ADL are impaired due to cognitive deficits. A detailed history, an adequate evaluation of cognitive functions, behavioural symptoms, and ADL are the main diagnostic tools, whereas auxiliary examinations are of less importance in standard cases. The application of clinical diagnostic criteria for PD-D facilitates the diagnostic process. Although not necessary when dementia with typical features for PD-D develops in the context of established PD, differential diagnosis with regard to other causes of parkinsonism associated with dementia may be required in complex cases.


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