Myocarditis
Myocarditis

View of transverse section of heart from above. Anterior surface faces upwards, thick left ventricle on the left, right ventricle on right.
Note area of myocardial pallor (2 arrows) mostly to the left of the left ventricular cavity involving less than 1/2 of the wall thickness. This is due to a dense interstitial infiltrate of inflammatory cells.
The normal appearing red myocardium elsewhere could also show microscopic infiltrates, which are not dense enough to see grossly.
(Description By:J. Hasson, M.D. )
(Image Contrib. by: Saint Francis Hospital )