May Be Caused by

 Common

Actinomycosis

Asbestosis

Blastomycosis

Bronchiolo-alveolar carcinoma

Bronchogenic carcinoma

Choriocarcinoma

Coal-worker pneumoconiosis

Coccidioidomycosis

Cryptococcosis

Histoplasmosis

Infected bulla

Infected cyst

Lung abscess

Metastasis

Nocardiosis

Pneumoconiosis with conglomerate mass

Pulmonary infarction

Round pneumonia

Silicosis

Talcosis

Tuberculosis

 Uncommon

Amebic abscess

Amyloidosis

Complicated hydatid cyst

Inflammatory pseudotumor

Intralobar pulmonary sequestration

Isoniazid cyst

Kaposi sarcoma

Lipoid pneumonia

Lung hematoma

Lymphoma

Paragonimiasis

Postoperative scar

Radiation-treated carcinoma

Rheumatoid nodule

Rounded atelectasis

Sarcoidosis

Wegener granulomatosis