Atypical parkinsonism encompasses neurodegenerative disorders such as Progressive supranuclear palsy Dementia with Lewy bodies Corticobasal ganglionic degeneration Multiple system atrophy Frontotemporal lobar degeneration Wilson disease Neurodegeneration with brain iron accumulation Westphal variant of Huntington disease Certain spinocerebellar ataxias Etiology of Secondary and Atypical Parkinsonism Parkinsonism results from drugs, disorders other than Parkinson disease, or exogenous toxins.