What masses are commonly found in the anterior mediastinum?
Thymus tumors, germ cell tumors (including teratomas), thyroid neoplasms, lymphomas
What masses are commonly found in the middle mediastinum?
Duplication cysts, lymphadenopathy, arch malformations
What is the etiology of bronchogenic cysts?
Congenital malformation of the bronchopulmonary tree (foregut malformation)
Very large multiloculated cystic lesion in all compartments of the mediastinum creating mass effect and encasement of the trachea and surrounding mediastinal structures. It extends from above the great vessels to the diaphragm. It displays T2 hyperintensity with solid features with loculations. It measures 9 x 11 x 19 cm in the right hemithorax, and 11 x 14 x 12 cm in the left hemithorax. Findings are suggestive of a large bronchogenic cyst.