Diagnosis and management of progressive supranuclear palsy.

Because of the relevance of an early and accurate diagnosis for prognosis, management, and participation of patients in research, the classical clinical features--features that should raise suspicion of progressive supranuclear palsy (PSP) and those that should make the diagnosis of PSP unlikely--are discussed in this article. The accuracy of currently used clinical diagnostic criteria and the role of laboratory investigations in the diagnosis of PSP are reviewed. New terminology for the clinical diagnostic criteria for PSP is proposed. The main neuropathologic and neurochemical features supporting current main symptomatic and hypothesized experimental biologic therapies are suggested.