Features of Type I Autoimmune Pancreatitis

AbstractSwollen duodenal papilla is one of the characteristic findings of type 1 autoimmune pancreatitis (AIP). Diffuse narrowing of the main pancreatic duct associated with AIP often misleads the diagnosis as pancreatic cancer. In these situations, typical findings on endoscopic retrograde cholangiopancreatography, endoscopic ultrasound, and intraductal ultrasound, as well as macroscopic features of the papilla, immunoglobulin-G4 (IgG4) expression in biopsy specimen from the papilla and elevated serum IgG4 help to make the correct diagnosis of type 1 AIP. This article is part of an expert video encyclopedia