Figure 2.

A and B (IHC400×) show liver tissue stained with hematoxylin and eosin (HE) (100×), revealing lymphocyte and eosinophil infiltration in the portal area, as well as bile stasis. C. displays CK7 staining (IHC 200×) in the liver tissue, indicating small bile duct proliferation, suggesting downstream biliary obstruction and bile stasis. D demonstrates liver tissue stained with Masson trichrome (400×), indicating increased collagen fiber formation. E presents reticular staining (200×) in the liver tissue, indicating fibrotic changes with the formation of pseudolobules. F shows IgG4 staining (IHC400×) in the liver tissue. G exhibits pancreatic tissue stained with IgG4 (IHC*200×). IHC = immunohistochemistry staining.