Diffuse filling of the distal airspaces of the lungs, the alveoli, with macrophages. desquamative interstitial pneumonitis (dip) is characterized additionally by thickened alveolar septa and by a sparse inflammatory infiltrate that often includes plasma cells and occasional eosinophils. the alveoli are lined by plump cuboidal pneumocytes. lymphoid aggregates may be present. [https://orcid.org/0000-0002-7371-8158, pmid:14338290, pmid:16728712, pmid:16738196, pmid:23728865, pmid:25657025]

Desquamative interstitial pneumonia (DIP) is a type of idiopathic interstitial pneumonia featuring elevated numbers of macrophages within the alveoli of the lung. DIP is a chronic disorder with an insidious onset...