Figure 1. The left side of the photomicrograph shows the typical routine histopathological appearance of adenoviral hepatitis. Note the poorly formed granulomatoid collection of macrophages, intermixed with partially viable hepatocytes. At this magnification, it is too difficult to recognize the inclusion-bearing cells. The right side of the photomicrograph illustrates positive immunohistocemical staining for viral antigens, which confirms the diagnosis, if one is unsure about the changes on routine light microscopy.