Atypical parkinsonism (AP) is a term applied to disorders characterized by parkinsonism that evolves rapidly, with poor or transient response to levodopa, or has other associated features such as early falls and postural instability, early autonomic failure, supranuclear gaze palsy, pyramidal or cerebellar signs, alien hand syndrome or severe ideomotor apraxia. The most common AP are multiple system atrophy, progressive supranuclear palsy (PSP) and corticobasal degeneration (CBD). Other APs include Caribbean parkinsonism (CP) and parkinsonism-dementia complex of Guam (PDC). In this review we provide an update in etiology, neuropathology, diagnosis and treatment of atypical parkinsonian disorders associated with protein tau deposit, also known as tauopathies.
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