Fig. 4
From: Immunoglobulin G4-related sclerosing cholecystitis presenting as gallbladder cancer: a case report
a Gross findings revealed a 4.5-cm mass involving the gallbladder and liver hilum. b Microscopic findings revealed diffuse lymphoplasmacytic infiltration, dense fibrosis, and obliterative phlebitis. c Other findings revealed infiltration of some eosinophils and neutrophils and some xanthogranulomatous inflammations. d Immunohistochemical staining for IgG4 showed IgG4/plasma cell 10–40 % and many IgG4-positive plasma cells (maximum density 50 per high-power field)