Orphanet: Search a disease

Search for a rare disease

* (*) mandatory field

Other search option(s)

Suggest an update

(*) Required fields.


Only comments seeking to improve the quality and accuracy of information on the Orphanet website are accepted. For all other comments, please send your remarks via contact us. Only comments written in English can be processed.

Captcha image

Primary progressive aphasia

Disease definition

Primary progressive aphasia (PPA) is a neurodegenerative disorder, characterized by a primary dissolution of language, with relative sparing of other mental faculties for at least the first 2 years of illness. PPA is recognized as the language variant in the frontotemporal dementia (FTD; see this term) spectrum of disorders. PPA can be classified into 3 subtypes based on specific speech and language features: semantic dementia (SD), progressive non-fluent aphasia (PNFA) and logopenic progressive aphasia (lv-PPA) (see these terms).


Classification level: Group of disorders
  • Synonym(s):
    • Mesulam syndrome
    • PPA
  • Prevalence: 1-9 / 100 000
  • Inheritance: Multigenic/multifactorial or Not applicable 
  • Age of onset: Adult
  • ICD-10: G31.0
  • OMIM: -
  • UMLS: C0282513
  • MeSH: D018888
  • GARD: 8541
  • MedDRA: -
The documents contained in this web site are presented for information purposes only. The material is in no way intended to replace professional medical care by a qualified specialist and should not be used as a basis for diagnosis or treatment.