Soft-tissue mediastinal mass

Common: Acute mediastinitis; Aortic aneurysm; Bochdalek hernia; Bronchogenic cyst; Castleman disease; Dilatation of aorta; Duplication cyst; Esophageal carcinoma; Esophageal leiomyoma; Fibrosing mediastinitis; Fracture of spine with hematoma; Granulomatous lung disease; Hematoma; Hernia of liver; Hiatal hernia; Infectious spondylitis; Intrathoracic goiter; Lymphadenopathy; Lymphoma; Mature hydatid cyst; Mediastinal abscess; Mediastinal hemorrhage; Metastasis; Metastatic lymphadenopathy; Morgagni hernia; Neoplasm of spine; Neurogenic tumor; Normal thymic enlargement; Paraspinal abscess; Paraspinal hemorrhage; Thoracic kidney; Thymic carcinoid; Thymic carcinoma; Thymic hyperplasia; Thymitis; Thymoma; Thyroid carcinoma; Tortuosity of aorta
Uncommon: Cardiac fibroma; Cardiac neoplasm; Cardiac sarcoma; Extralobar pulmonary sequestration; Extramedullary hematopoiesis; Germ cell tumor; Hemangioma; Localized fibrous tumor of pleura; Lymphangioma; Mesothelioma; Paraganglioma; Parathyroid adenoma; Parathyroid carcinoma; Sarcoma; Seminoma; Spindle cell tumor; Teratoma