Pulmonary infiltrate

{{Short description|Substance denser than air and associated with lung disease}}

A pulmonary infiltrate is a substance denser than air, such as pus, blood, or protein, which lingers within the parenchyma of the lungs.{{cite journal |title=Assessment of persistent pulmonary infiltrate - Differential diagnosis of symptoms {{!}} BMJ Best Practice |website=bestpractice.bmj.com |url=https://bestpractice.bmj.com/topics/en-gb/1094 |accessdate=26 August 2019}} Pulmonary infiltrates are associated with pneumonia, tuberculosis,{{citation needed|date=August 2019}} and sarcoidosis.{{cite journal |last1=Nunes |first1=Hilario |last2=Uzunhan |first2=Yurdagul |last3=Gille |first3=Thomas |last4=Lamberto |first4=Christine |last5=Valeyre |first5=Dominique |last6=Brillet |first6=Pierre-Yves |title=Imaging of sarcoidosis of the airways and lung parenchyma and correlation with lung function |journal=European Respiratory Journal |date=September 2012 |volume=40 |issue=3 |pages=750–765 |doi=10.1183/09031936.00025212|pmid=22790910 |s2cid=1122904 |doi-access=free }}

Pulmonary infiltrates can be observed on a chest radiograph.{{citation needed|date=August 2019}}