Case presentation of type 1 AIP and IgG4-RD
Three cases with type 1 AIP with solitary involvement of the pancreas were enrolled in this study (Fig. 1A). All patients met the diagnostic criteria for definite type 1 AIP [21]. All patients were treated with PSL; then, remission was successfully induced, as evidenced by reductions in serum concentrations of IgG4 (Fig. 1B). In a typical case of type 1 AIP (Case 1), the diffuse pancreatic swelling and capsule-like rim seen before PSL administration disappeared after the treatment (Fig. 1C).