A form of dementia characterized primarily by inability to name objects or recall words during conversation. Progressive deterioration in the use of language is characteristic of this dementia. By contrast, in Alzheimer disease, deficits in short-term memory (and social interaction) occur before language use deteriorates.
A form of dementia marked by the inability to recall the names of things, to read, or to express oneself with speech. The disorder gradually worsens and may ultimately produce other cognitive deficits. Early in the course of the disease, other brain functions pertaining to daily living are preserved, e.g., understanding speech, correct social behavior, and practicing hobbies. PPA is associated with nonspecific degeneration of neurons in the left hemisphere of the brain.
A symptom pattern of multiple sclerosis characterized by continuous progression of the disorder without periods of remission, occasionally punctuated by plateaus or minor improvements.