Fibrinous pericarditis
Fibrinous pericarditis is an exudative inflammation. The visceral pericardium (epicardium) is infiltrated by the fibrinous exudate. This consists in fibrin strands and leukocytes. Fibrin describes an eosinophilic (pink) network, amorphous. Leukocytes (mainly, neutrophils) are found within the fibrin deposits and intrapericardic. Vascular congestion is also present. The myocardium has no changes. (Hematoxylin-eosine, ob. x4)
Fibrinous pericarditis (detail)
Fibrinous pericarditis (Hematoxylin-eosine, ob. x20)