Pathology Macrophages with abundant cytoplasm containing dusty brown pigment are seen in A Desquamative Interstitial Pneumonia B Pulmonary Alveolar Proteinosis C Pulmonary Langerhans Cell Histiocytosis D Pulmonary Eosinophilia 💡 Explanation Macrophages with abundant cytoplasm containing dusty brown pigment are seen in ✓ Correct Answer: A. Desquamative Interstitial Pneumonia