May Be Caused by

Achalasia

AIDS

Alveolar lung disease

Azygos continuation of inferior vena cava

Bronchogenic cyst

Castleman disease

Descending aorta dilatation

Dilated azygos vein

Duplication cyst

Esophageal carcinoma

Esophageal dilatation

Esophageal varices

Histoplasmosis

Inferior vena cava obstruction

Left atrial enlargement

Localized fibrous tumor of pleura

Lung cancer

Lymphoma

Metastasis

Paraesophageal lymphadenopathy

Pleural effusion or thickening

Pleural mesothelioma

Pleural metastasis

Pulmonary atelectasis

Sarcoidosis

Subcarinal lymphadenopathy

Superior vena cava syndrome

Tuberculosis