Mayo Clinic HISORt Criteria for IgG4 Autoimmune Pancreatitis
(1) Periductal lymphoplasmacytic infiltrate with obliterative phlebitis and storiform fibrosis (LPSP) OR
(2) Lymphoplasmacytic infiltrate with storiform fibrosis showing abundant (210 cells/HPF) IgG4-positive cells
Typical: diffusely enlarged gland with delayed (rim) enhancement; diffusely irregular, attenuated main pancreatic duct
Others: Focal pancreatic mass/enlargement; focal pancreatic duct stricture; pancreatic atrophy; pancreatic calcification; or pancreatitis
Serology: Elevated serum IgG4 level (>135 mg/dL)
Other Organ Involvement.
Response to steroids.