Fig. 1
From: Mild cognitive impairment in Parkinson’s disease: a distinct clinical entity?
A schematic diagram showing the contributions of multiple pathologies to cognitive decline in Parkinson’s Disease (PD). Assuming dementia is the end point, some PD patients with mild cognitive impairment (PD-MCI) may progress to dementia (PDD), while some PD-MCI patients may revert to normal cognition (PD-NC) or stay with PD-MCI. Within the degenerative process, Alzheimer’s disease (AD), Lewy bodies (LB), and neuropsychiatric pathologies may insidiously develop alongside the existing PD pathology to worsen cognition