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Hello, this is Dr. David. I have read your question and I'm ready to help.progressive supranuclear palsyhere is a good website with lots of asnwers http://www.ninds.nih.gov/disorders/psp/detail_psp.htmthere are several key differences between PSP and parkinsonsPSP problems with speech more common eye movements abnormaltremors rare Levodopa doesn't work
speech problems less common
eye movement normal
tremors more common
PSP is a different condition than parkinsons and there is no data suggesting that patients with PSP will progress to parkinsons, even though diagnosis of PSP is often very difficult and often times many patients who have PSP get misdiagnosed as having parkinsons. read over the link I included let me know if you have questions.