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[[File:Histopathology of pulmonary congestion and siderophages.jpg|thumb|220px|'''Siderophages'''{{Siderophage note 1}} (one indicated by white arrow), indicating chronic left heart failure. Also pulmonary '''congestion''' and '''lymphocytes''', consistent with acute or chronic heart failure.]]
→Microscopic evaluation: Linked away
==Microscopic evaluation==
Look for the most common pathologic lung findings:<ref name="TiwanaNibhoria2014">'''India''': {{cite journal|last1=Tiwana|first1=Kanwardeep Kaur|last2=Nibhoria|first2=Sarita|last3=Gupta|first3=Manvi|last4=Yadav|first4=Ashish|title=Histopathological Spectrum in Lung Autopsies- A 50 Case Study|journal=Indian Journal of Forensic Medicine & Toxicology|volume=8|issue=2|year=2014|pages=172|issn=0973-9122|doi=10.5958/0973-9130.2014.00709.9}}</ref><ref>'''United States''': {{cite web|url=https://washingtonforensicsservices.com/pulmonary-lung-conditions-found-at-autopsy/|title=Pulmonary Lung Conditions Found at Autopsy|author=Dr. Stanley Adams|website=Washington Forensic Services|accessdate=2019-12-20}}</ref>
*'''[[Alveolar fluid]]'''. {{further|Alveolar fluid|linebreak=no}}
*'''Vascular congestion''', which can usually be seen easiest in the alveolar walls. It indicates left sided heart failure, especially when seen together with [[alveolar fluid]].
*'''Inflammatory''' cells, where a mild to moderate lymphocytic infiltrate is consistent with with heart failure, while neutrophils indicate pneumonia. '''[[pigmented macrophages]]''' of the lung may indicate chronic heart failure.
*'''Mycobacteria''' in regions of the world with substantial prevalence
*'''Carcinoma''' {{further|Lung tumor|linebreak=no}}
