The ways in which Bruce Willis's brain is altered by the condition known as frontotemporal dementia.

Dementias such as Alzheimer's affect about 55 million people around the globe. Recently, Bruce Willis received a diagnosis of frontotemporal dementia (FTD), a form of dementia that affects a relatively small percentage of the population and is most common in individuals aged 45 to 64. Instead of memory loss being the primary presenting feature, as it is in Alzheimer's, behavioral alterations are often the first indicator of FTD. Altera....