Atypical parkinsonism and other Parkinson-plus syndromes are often difficult to differentiate from PD and each other. They include multiple system atrophy (MSA), progressive supranuclear palsy (PSP), and corticobasal degeneration (CBD). Dementia with Lewy bodies (DLB), may or may not be part of the PD spectrum, but it is increasingly recognized as the second-most common type of neurodegenerative dementia after Alzheimer's disease. These disorders are currently lumped into two groups, the synucleinopathies and the tauopathies.[4][5] They may coexist with other pathologies.[6]
^Mitra K.; Gangopadhaya P. K.; Das S. K. (2003). "Parkinsonism plus syndrome—a review". Neurol India. 51 (2): 183–188. PMID14570999.
^Vertes, Alex C.; Beato, Morris R.; Sonne, James; Khan Suheb, Mahammed Z. (2022). "Parkinson-plus Syndrome". StatPearls. StatPearls Publishing. PMID36256760. Retrieved 20 February 2023.
^Mark, M. H. (2001). "Lumping and splitting the Parkinson Plus syndromes: dementia with Lewy bodies, multiple system atrophy, progressive supranuclear palsy, and cortical-basal ganglionic degeneration". Neurologic Clinics. 19 (3): 607–27. doi:10.1016/S0733-8619(05)70037-2. PMID11532646.