An autopsy case showing massive fibrinoid necrosis of the portal tracts of the liver with cholangiographic findings similar to those of primary sclerosing cholangitis

Figure 4 A: Immunohistochemical staining demonstrates the positivity of the fibrinoid material for fibrinogen; B: An electron micrograph shows dense deposit materials suggestive of fibrinoid necrosis around the small bile ducts in the portal tract of the liver (original magnification x 2000).