Dictionary of Cancer Terms
View in Spanish: Mediastino
Mediastinum (MEE-dee-uh-STY-num)
The area between the lungs. The organs in this area include the heart and its large blood vessels, the trachea, the esophagus, the thymus, and lymph nodes but not the lungs.
Source: National Cancer Institute Dictionary of Cancer Terms, available at www.cancer.gov/dictionary.