Final answer:
A mediastinal mass is an abnormal growth in the middle region of the mediastinum. It can be caused by tumors, infections, cysts, or enlarged lymph nodes. Diagnosis and treatment depend on the specific characteristics and symptoms.
Step-by-step explanation:
A mediastinal mass refers to an abnormal growth or tumor in the medial (middle) region of the mediastinum.
The mediastinum is the area between the lungs that contains important structures such as the heart, blood vessels, thymus, and lymph nodes.
Mediastinal masses can be caused by various conditions including tumors, infections, cysts, or enlarged lymph nodes. Diagnosis and treatment depend on the specific characteristics of the mass and the presenting symptoms.