Which of the following is NOT a cause of an anterior mediastinal mass?

Which of the following is NOT a cause of an anterior mediastinal mass?

• A. Thymoma
• B. Thymic carcinoma
• C. Germ-cell tumor
• D. Esophageal diverticulum

Answer: (D)

An anterior mediastinal mass is most often from thymic-origin lesions or germ cell tumors, because the thymus and most extragonadal germ cells reside in the anterior compartment. Thymoma and thymic carcinoma arise from thymic epithelium in the anterior mediastinum, and germ-cell tumors such as teratomas can occur there as well. Esophageal diverticulum, however, is a dilation of the esophagus that sits in the posterior mediastinum and typically presents behind the heart rather than in front of it. Therefore, an esophageal diverticulum would not present as an anterior mediastinal mass. In short, anterior mediastinal masses are classically thymic lesions or germ-cell tumors; posteriorly located processes like an esophageal diverticulum point to a different mediastinal compartment.

An anterior mediastinal mass is most often from thymic-origin lesions or germ cell tumors, because the thymus and most extragonadal germ cells reside in the anterior compartment. Thymoma and thymic carcinoma arise from thymic epithelium in the anterior mediastinum, and germ-cell tumors such as teratomas can occur there as well. Esophageal diverticulum, however, is a dilation of the esophagus that sits in the posterior mediastinum and typically presents behind the heart rather than in front of it. Therefore, an esophageal diverticulum would not present as an anterior mediastinal mass. In short, anterior mediastinal masses are classically thymic lesions or germ-cell tumors; posteriorly located processes like an esophageal diverticulum point to a different mediastinal compartment.