Usefulness of ultrasonography to assess the response to steroidal therapy for the rare case of type 2b immunoglobulin G4-related sclerosing cholangitis without pancreatitis: A case report

Figure 2 Histopathological findings. A tissue sample was collected from the stenotic lower bile duct and stained with hematoxylin and eosin staining (A), IgG (B), IgG4 (C). Marked infiltration of the inflammatory cells (A-C, orange arrowheads) and storiform fibrosis (A-C, orange arrows) were observed. An increase in the number of IgG- (B) and IgG4-positive cells (C) was noted. Liver tissue showed infiltration of inflammatory cells (D: hematoxylin-eosin staining; E: IgG; F: IgG4, orange arrowheads) partly positive for IgG (E) and IgG4 (F). The scale bars represent 100 µm and 50 µm in the insets.