In this edited volume, experts on the treatment of dementia associated with Parkinson's Disease (PD) describes in detail the current status of knowledge in their respective area of expertise. The importance and clinical relevance of cognitive impairment and dementia in PD is emphasized, all relevant aspects including epidemiology, full and detailed spectrum of clinical features, current knowledge on pathology, neurochemistry and genetics, findings in auxillary investigations, relation to other neurodegenerative disorders, diagnostic process and management are described, rounded-up by discussion of future research directions and expectations. The text is complemented and enriched with tables, figures and is heavily referenced thereby capturing all relevant literature.