Fig. 5
Histological analysis of pericardial adhesion tissues. a Hematoxylin and eosin staining (left panels) and Masson’s trichrome staining (middle and right panels) of non-adhesions, moderate adhesions (Grade 2 in category B) and severe adhesions (Grade 3 in category B). The right-hand panels show enlarged epicardia in areas corresponding to the lines in the middle panels. b Immunohistochemical staining of F4/80 (upper panels) and alpha smooth muscle actin (lower panels)