Question

Which of the following is NOT in the differential diagnosis of an anterior mediastinal mass?

• A. Teratoma
• B. Neurogenic tumour
• C. Thymoma
• D. Lymphoma

Hint:

Remember the anterior mediastinum 4 Ts (thymoma, teratoma, thyroid, terrible lymphoma); neurogenic tumours belong to the posterior compartment.

Answer 1

The Correct Option is B

This question tests knowledge of which masses typically sit in the anterior part of the mediastinum, and which one is instead found elsewhere.

1. Teratoma: A germ cell tumour that is one of the standard anterior mediastinal masses, so it belongs on the list.
2. Neurogenic tumour: These tumours grow from nerve tissue near the spine, which places them in the posterior mediastinum, not the anterior compartment, so this one does not belong.
3. Thymoma: Comes from the thymus, an anterior mediastinal structure, so it belongs on the list.
4. Lymphoma: Frequently presents as anterior mediastinal or hilar nodal disease, so it belongs on the list too.

A simple way to remember the anterior mediastinum causes is the "4 Ts": thymoma, teratoma or other germ cell tumour, thyroid (retrosternal goitre), and terrible lymphoma. Neurogenic tumours fall outside this group because they arise from posterior mediastinal nerve structures.

Let's summarize:

• Anterior mediastinal masses follow the 4 Ts: thymoma, teratoma, thyroid, terrible lymphoma.
• Neurogenic tumours are the classic posterior mediastinal masses, arising near the spine and sympathetic chain.

So the correct answer is neurogenic tumour.