This type of dementia is degenerative and ultimately fatal, with patients not lasting longer than 10 years.

Common signs and symptoms include significant changes in social and personal behavior, apathy, blunting of emotions, and deficits in both expressive and receptive language.

Patients suffer a loss of social awareness and lack of impulse control. They may also experience  loss of semantic understanding, resulting in impaired word comprehension. They may also develop difficulties in speaking. 

Eventually patients require 24-hour care.