Usefulness of biopsying the major duodenal papilla to diagnose autoimmune pancreatitis: A prospective study using IgG4-immunostaining

Figure 1 Histology of biopsy specimen taken from the major duodenal papilla of a patient with autoimmune pancreatitis showing severe lymphoplasmacytic infiltration.

Figure 2 IgG4-immunostaining of biopsy specimen taken from the major duodenal papilla of a patient with autoimmune pancreatitis showing an abundant infiltration of IgG4-positive plasma cells (≥10/HPF).