Imagine being told you are living with Alzheimer’s disease only to discover you have been misdiagnosed and are suffering from another neurodegenerative condition. At 52 years old, Mike Belleville was diagnosed with early-onset Alzheimer’s. Several years later, he was reevaluated and learned he has Lewy body dementia (LBD), a disease many researchers believe is the second most common form of dementia, affecting an estimated 1.3 million Americans. Belleville is among a number of people who have experienced the pain of misdiagnosis and are living with what the Lewy Body Dementia Association (LBDA) calls “the most misdiagnosed form of dementia.”