Version October 2024
| Key histologic features |
| Bronchiolocentric alveolar macrophage accumulation |
| Mild bronchiolar fibrosis and chronic inflammation |
| Macrophages have dusty brown cytoplasm (may be positive for iron stains) |
| Pertinent negative findings |
| Lack of diffuse macrophage accumulation |
| Lack of interstitial fibrosis and/or honeycomb fibrosis |
| Absence of fibroblast foci |
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