Pulmonary edema, depicted in the images below, can be identified by the presence of pale staining eosinophilic appearance around perivascular interstitial spaces leading to widening of alveolar septa. There will be progressive accumulation of plasma fluid in alveolar spaces along with extravasated RBCs and WBCs in interstitium as well as in alveolar spaces. Heart failure cells may also be found.
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Compare it with normal histology of lungs