May Be Caused by

 Common

Asbestosis

Aspiration pneumonia

Atelectasis

Bronchiectasis

Connective tissue disease

Dermatomyositis

Hydrocarbon aspiration

Idiopathic pulmonary fibrosis

Interstitial fibrosis

Pulmonary edema

Rheumatoid lung disease

Scleroderma

Sjögren syndrome

Systemic lupus erythematosus

Viral pneumonia

 Uncommon

Alveolar proteinosis

Amiodarone

Bleomycin

Bronchiolitis obliterans with organizing pneumonia

Busulfan

Carmustine

Chemotherapy

Cyclophosphamide

Desquamative interstitial pneumonitis

Kaposi sarcoma

Lipoid pneumonia

Lung metastasis

Lymphangitic lung metastasis

Lymphocytic interstitial pneumonitis

Lymphomatoid granulomatosis

Methotrexate

Methysergide

Neurofibromatosis

Nitrofurantoin

Nonspecific interstitial pneumonitis

Nonspecific interstitial pulmonary fibrosis

Procainamide