Microsocpy
There are large numbers of intraalveolar macrophages. The macrophages have slightly eosinophilic staining cytoplasm.
Also present are lymphoid aggregates (aggregates of lymphocytes) in interstitial tissue.
The intralveolar macrophages in DIP show cytoplasmic PAS positivity (red).
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Desquamative interstitial pneumonia by Washington deceit
See also
desquamative interstitial pneumonia-like pattern (DIP-like pattern)