Autoimmune pancreatitis (AIP) is considered as a benign type of chronic pancreatitis that can be treated with corticosteroids. It is manifested with abdominal pain, weight loss and nausea.
There are 3 diagnostic criteria for autoimmune pancreatitis:
1. Diffuse narrowing of the main pancreatic duct with irregular wall should be shown on ERCP (endoscopic retrograde cholangio-pancreaticography);
2. Abnormally elevated levels of serum gamma globulin and presence of autoantibodies (ANA, RF...), and
3. Histopathologic examination of the pancreas shows fibrotic changes with lymphocyte and plasma cell infiltrate.