Endoscopic approach for diagnosing autoimmune pancreatitis

Figure 1 Diffuse irregular narrowing of the main pancreatic duct of an AIP patient on ERP.

Figure 2 ERCP findings of an AIP patient. A: Segmental narrowing of the main pancreatic duct and stenosis of the lower bile duct before steroid therapy; B: After steroid therapy, stenosis of the main pancreatic duct and bile duct is improved.

Figure 3 Immunohistochemistry of biopsy specimen taken from the major duodenal papilla of an AIP patient. A: HE staining showing significant lymphoplasmacytic infiltration; B: IgG4 immunostaining showing significant infiltration of IgG4-positive plasma cells (10 ≥ 10/HPF).

Figure 4 A hypoechoic mass in an AIP patient. A: Endoscopic ultrasonography finding. EUS-FNA was performed to this mass lesion; B: Histology of the specimen gained by EUS-FNA (HE).

Figure 5 Intraductal ultrasonography finding of an AIP patient showing wall thickening of the common bile duct without stenosis (arrow).