The surface of the lung is very smooth and excessively reflective indicating the presence of pulmonary oedema. In the histology images displayed below, the majority of the alveoli is filled with a pink material, that represents the oedema liquid (left-side image, H&E, 100x; right-side image, H&E, 400x). As with congestion, pulmonary oedema may be a consequence of haemodynamic disturbances – caused by cardiac failure, for instance – or of inflammatory processes of the lung.
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