ASTRID & HANNS-FRIEDER MICHLER / SCIENCE PHOTO LIBRARY ASTRID & HANNS-FRIEDER MICHLER / SCIENCE PHOTO LIBRARY
Myocarditis. Light micrograph of human cardiac muscle with chronic myocarditis (inflammation). In this longitudinal section, muscle fibres run diagonally (purple). Abnormal features are a loss of organisation of the muscle fibres which are normally closely spaced, with the spaces between fibres (white, blue) representing oedema. There are neutrophils (white blood cells, purple dots) infiltrating the oedematous areas, as an early inflammatory response and to prevent infection. Chronic myocarditis is caused by rheumatic fever and virus infections, with enlargement of the heart. Magnification: x50 at 35mm size.
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