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IgA nephropathy (IgAN), also known as Berger's disease () (and variations), or synpharyngitic glomerulonephritis, is a disease of the kidney (or nephropathy) and the immune system; specifically it is a form of glomerulonephritis or an inflammation of the glomeruli of the kidney. Aggressive Berger's disease (a rarer form of the disease) can attack other major organs, such as the liver, skin and heart.
IgA nephropathy is the most common glomerulonephritis worldwide; the global incidence is 2.5/100 000 a year amongst adults. Aggressive Berger's disease is on the NORD list of rare diseases. Primary IgA nephropathy is characterized by deposition of the IgA antibody in the glomerulus. There are other diseases associated with glomerular IgA deposits, the most common being IgA vasculitis (formerly known as Henoch–Schönlein purpura [HSP]), which is considered by many to be a systemic form of IgA nephropathy. IgA vasculitis presents with a characteristic purpuric skin rash, arthritis, and abdominal pain, and occurs more commonly in children. HSP is associated with a more benign prognosis than IgA nephropathy. In non-aggressive IgA nephropathy there is traditionally a slow progression to chronic kidney failure in 25–30% of cases during a period of 20 years.