May Be Caused by

 Common

Aspiration pneumonia

Atelectasis

Atypical mycobacterial infection

Bronchopneumonia

Infectious pneumonia

Localized pulmonary edema

Lung contusion

Obstructive pneumonia

Pulmonary hemorrhage

Pulmonary infarction

Round atelectasis

Round pneumonia

Tuberculosis

 Uncommon

Amebiasis

Ascariasis

Blastomycosis

Bronchiolo-alveolar carcinoma

Coccidioidomycosis

Cryptococcosis

Eosinophilic pneumonia

Fungal disease

Histoplasmosis

Intralobar pulmonary sequestration

Lipoid pneumonia

Löffler syndrome

Lung torsion

Lymphoma

Mucoid impaction

Paragonimiasis

PIE

Pneumoconiosis

Pneumocystis carinii

Pseudolymphoma

Radiation pneumonitis

Sarcoidosis

SARS

Strongyloidiasis

Systemic lupus erythematosus

Zygomycosis