Fibrinous pericarditis is an exudative inflammation. The pericardium is infiltrated by the fibrinous exudate. This consists of fibrin strands and leukocytes. Fibrin describes an amorphous, eosinophilic (pink) network. Leukocytes (white blood cells; mainly neutrophils) are found within the fibrin deposits and intrapericardic. Vascular congestion is also present. Inflammatory cells do not penetrate the myocardium (as is seen with other presentations of pericarditis), and as a result, this particular variant does not present with diffuse ST elevation on ECG (a classic sign of pericarditis known as stage I ECG changes which are seen with other causes) because the inflammatory cells do not penetrate the myocardium. To naked eye examination, this pathology is referred to as having a "Bread and Butter Appearance".
Uremic pericarditis
Acute pericarditis
Constrictive pericarditis
Tachycardia-induced cardiomyopathy
Ischemic cardiomyopathy
Tamponade
Myopericarditis
Tuberculous pericarditis