Type 2 autoimmune pancreatitis associated with severe ulcerative colitis: Three case reports

Table 1 Diagnostic criteria for type 2 autoimmune pancreatitis

	Level 1	Level 2
Clinical	A response to a steroid trial with rapid (< 2 wk) radiologically demonstrable resolution or marked improvement in manifestations	Clinically diagnosed inflammatory bowel diseases
Parenchymal imaging	Diffuse enlargement with delayed enhancement	Segmental/focal enlargement with delayed enhancement
Ductal imaging	Long (> 1/3 length of the main pancreatic duct) or multiple strictures without marked upstream dilatation	Segmental/focal narrowing without marked upstream dilatation (duct size, < 5 mm)
Histology	Granulocytic infiltration of duct wall, granulocytic epithelial lesions with or without granulocytic acinar inflammation and; absent or scant (0-10 cells/HPF) IgG4-positive cells	Granulocytic and lymphoplasmacytic acinar infiltrate and; again absent or scant (0-10 cells/HPF) IgG4-positive cells