Anemia, Pernicious

**Definition:** A megaloblastic anemia occurring in children but more commonly in later life, characterized by histamine-fast achlorhydria, in which the laboratory and clinical manifestations are based on malabsorption of vitamin B 12 due to a failure of the gastric mucosa to secrete adequate and potent intrinsic factor. (Dorland, 27th ed)

**Tree numbers:** - C15.378.050.252.196.500 - C18.654.521.500.133.699.923.280

**Synonyms:** - Addison's Anemia - Anemia, Addison's - Pernicious Anemia