Anterior Mediastinal Mass

Excerpt

The mediastinum is located between the lungs and houses vital structures, including the thymus, heart, major blood vessels, lymph nodes, nerves, and portions of the esophagus and trachea. Anteriorly, the sternum bounds the mediastinum, while the thoracic vertebrae define the posterior border. Superiorly, it extends to the thoracic inlet, while the diaphragm forms its inferior boundary. Laterally, the mediastinum is delineated by the pericardial and mediastinal pleurae, encompassing critical thoracic organs and structures. Mediastinal tumors account for 3% of all the tumors that arise in the thoracic cavity.

Comprising anterior, middle, and posterior compartments, mediastinal masses span a broad histopathological spectrum, with 50% occurring anteriorly. The most common anterior masses are often known by the 4T's: thymoma, teratoma, thyroid tissue, and 'terrible' lymphoma. These masses present unique challenges due to their proximity to critical thoracic structures. While imaging advancements aid characterization, accurate diagnosis often requires a multimodal approach integrating radiology, histology, and molecular techniques. Management considerations encompass histopathology, patient factors, and tumor biology. This article comprehensively reviews clinical presentation, diagnostic evaluation, and therapeutic interventions for anterior mediastinal masses, addressing recent advancements and controversies.