Progressive supranuclear palsy presenting as classic levodopa-responsive Parkinson's disease of 20 years duration

Background: Despite established clinical diagnostic criteria for Progressive Supranuclear Palsy (PSP) cases resembling Parkinson’s disease (PD) are well recognised. Atypical features for PD are however almost always present late in the clinical course. We report a case of pathologically proven PSP with a typical and prolonged clinical course for PD.