What is frontotemporal dementia? Bruce Willis' condition explained

Willis, seen here in 2013 before his diagnosis, was initially said to have aphasia, before being diagnosed with FTD. — dpa

The family of US actor Bruce Willis has announced that his previous diagnosis of the cognitive condition aphasia has developed into frontotemporal dementia.

In an update shared online, the family said they had the "deepest gratitude for the incredible outpouring of love” following the initial news.