Causes of Miliary mottling :-Infection :- Bacterial (TB, Brucellosis, Bronchopneumonia, Melioidosis), viral (varicella I chicken pox), Fungal (Histoplasmosis, Coccidiodomycosis, blastomycosis, cryptococcosis). Cardiac :- Mitral stenosis, Pulmonary edema, multiple pulmonary infarct. Pneumoconiosis :- Coal worker pneumoconiosis, silicosis. Neoplastic :- Lymphangitis carcinomatosis, alveolar cell Ca., lymphoma, leukemia, metastasis. Allergic :- Loeffler's syndrome, tropical eosinophilia. Others :- IPF, RA, Sarcoidosis, Histocytosis-X, HMD, Haemosiderosis