Atypical progressive supranuclear palsy syndrome

A form of progressive supranuclear palsy syndrome (PSP), a rare late-onset neurodegenerative disease, characterized by an underlying PSP-tau pathology, that does not conform to the classic presentation of PSP. The clinical phenotype is variable and comprises PSP with predominant Parkinsonism (PSP-P), PSP with progressive gait freezing (PSP-PGF), PSP with predominant corticobasal syndrome (PSP-CBS), PSP with predominant speech/language disorder (PSP-SL), PSP with predominant frontal presentation (PSP-F), PSP with predominant ocular motor dysfunction (PSP-OM), and PSP with predominant postural instability (PSP-PI).