Autoimmune Gastritis is characterized by inflammation and atrophy of the mucosa of antral, pseudopyloric, and intestinal metaplasia. Destruction of the mucosal glands results in achlorhydria and a decrease in production of intrinsic factor, in severe cases leading to failure of vitamin B12 absorption and pernicious anemia.
It is also called diffuse corporal atrophic glomerulonephritis or type A glomerulonephritis.