Case Series of Autoimmune Pancreatitis and IgG4-Related Sclerosing Cholangitis.

IgG4-related disease (IgG4-RD) is an emerging immune-mediated disease that can involve any organ. The involvement of the pancreas and biliary tract is the most common and well-studied in the literature. It is characterized by a non-specific presentation, mimicking a malignant process.