May Be Caused by

 Common

Atelectasis of one lung

Chylothorax

Empyema

Hemothorax

Massive hydrothorax

Pleural effusion

Pneumonia

Postpneumonectomy fibrothorax

Thoracoplasty

Tuberculosis

Unilateral lung consolidation

 Uncommon

Agenesis of one lung

Chest wall hematoma

Congenital diaphragmatic hernia

Cystic adenomatoid malformation type 3

Eventration of diaphragm

Fibrosis of lung or pleura

Lung carcinoma metastasis

Massive cardiomegaly

Mediastinal mass

Mesothelioma

Metastasis from osteosarcoma

Metastasis to pleura

Pulmonary mass

Traumatic diaphragmatic hernia