D2I2.
autoimmune

IgG4-related disease

IgG4-related disease (IgG4-RD), formerly known as IgG4-related disease, is a condition characterized by infiltration with lymphocytes and IgG4-secreting cells, various degrees of (scarring) and a usually prompt response to oral . In approximately 51–70% of people with this disease, serum IgG4 concentrations are elevated during an acute phase.

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Plain-language summary adapted from Wikipedia. Not medical advice.