Figure 1).

Histological sections from patients with myocarditis. A Viral myocarditis. A predominantly lymphocyte infiltrate is seen between the myofibrils. The myocyte (M) has irregular contours suggesting an active myocarditis. Macrophages (arrowheads) are also seen among the inflammatory infiltrate (hematoxylin and eosin stain, original magnification ×40). B Eosinophilic myocarditis. A heavy infiltrate of inflammatory cells, predominately eosinophils (arrowheads) with macrophages and some mononuclear cells. These clusters of cells are found in areas of damaged myocardium (hematoxylin and eosin stain, original magnification ×40). C Giant cell myocarditis. Lymphocytes, occasional plasma cells and giant cells (arrowhead) are found in areas of damaged myocytes (hematoxylin and eosin stain, original magnification ×40)