Key histologic features |
Uniform involvement of lung parenchyma. |
Prominent accumulation of alveolar macrophages (may show fine granular positivity with iron stains). |
Mild to moderate fibrotic thickening of alveolar septa. |
Mild interstitial chronic inflammation (lymphoid aggregates). |
Pertinent negative findings |
Dense and extensive fibrosis: inconspicuous or absent. |
Smooth muscle proliferation: inconspicuous or absent. |
Honeycomb fibrosis absent. |
Fibroblastic foci and organizing pneumonia: inconspicuous or absent. |
Eosinophils: inconspicuous, absent, or only focal. |
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