Primary progressive aphasia (PPA), also known as Mesulam's Syndrome, is a gradually appearing and gradually worsening disorder of speech that occurs without any major change in other cognitive functions for a period of at least two years. There are three main variants of PPA:

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Understanding Primary Progressive Aphasia - An article with a description, assistance available and where to obtain additional information.
WebMD Live Chat Transcript: - Living with aphasia with Martha Taylor Sarno, MD.
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