Corticobasal syndrome (CBS) is a rare brain disorder that mainly affects movement. It belongs to a group of conditions called frontotemporal degeneration (FTD). These disorders damage parts of the brain responsible for movement, behavior, and language. Some of the symptoms of CBS are similar to those seen in Parkinson’s disease, which is why it is sometimes described as a type of “atypical Parkinsonism.” What Happens in Corticobasal Syndrome? In CBS, certain areas of the brai