Parkinson Plus Syndromes comprise a set of things that are atypical but look like PD. They include Progressive Supranuclear Palsy, CorticoBasal Degeneration, and Multiple System Atrophy. They have different treatments and need to be addressed in different ways from the ways we normally address PD itself. I suggest searching credible websites for "atypical parkinsonism," "parkinson plus syndromes," etc.