A progressive form of
dementia characterized by the global loss of
language abilities and initial preservation of other cognitive functions. Fluent and nonfluent subtypes have been described. Eventually a pattern of global cognitive dysfunction, similar to
alzheimer disease, emerges. Pathologically, there are no Alzheimer or PICK DISEASE like changes, however, spongiform changes of cortical layers II and III are present in the
temporal lobe and
frontal lobe. (From
brain 1998 Jan;121(Pt 1):115-26)