Primary progressive aphasia
Primary progressive aphasia (PPA) is a type of neurological syndrome in which language capabilities slowly and progressively become impaired. Although it was first described as solely impairment of language capabilities while other mental functions remain intact. it is now recognized that many, if not most of those afflicted suffer impairment of memory, short term memory formation and loss of executive function. It was first described as a distinct syndrome by M.-Marsel Mesulam in 1982. Primary Progressive Aphasias have a clinical and pathological overlap with the Frontotemporal Lobar Degeneration (FTLD) spectrum of disorders and Alzheimer's disease.