<unk> s (PPS) are a group of neurodegenerative diseases featuring the classical features of<unk> 's disease (tremor, rigidity, akinesia/bradykinesia, and postural instability) with additional features that distinguish them from simple idiopathic<unk> 's disease (PD).<unk> s are either inherited genetically or occur sporadically. Atypical<unk> ism and other<unk> s 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. They may coexist with other pathologies. Additional<unk> s include Pick's disease and olivopontocerebellar atrophy. The latter is characterized by ataxia and dysarthria, and may occur either as an inherited disorder or as a variant of multiple system atrophy. MSA is also characterized by autonomic failure, formerly known as Shy–Drager syndrome.
Parkinson-plus syndrome
Huntington's disease-like syndrome
X-linked dystonia parkinsonism
Sydenham's chorea
Wernicke–Korsakoff syndrome
Stratton Parker syndrome
Dopamine-responsive dystonia
Progressive supranuclear palsy