Attention has turned to progressive supranuclear palsy, a rare neurodegenerative disorder. Here's what it is and why it's often mistaken for Parkinson’s disease.

Jackson was diagnosed with progressive supranuclear palsy, also known as PSP. Here's what to know about his cause of death.

Learn about progressive supranuclear palsy (PSP), a rare brain disorder affecting body movements, balance, and eye movements. Understand the differences between PSP and Parkinson's disease.