Question:
Which of the following is NOT in the differential diagnosis of an anterior mediastinal mass?
Which of the following is NOT in the differential diagnosis of an anterior mediastinal mass?
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Remember the anterior mediastinum 4 Ts (thymoma, teratoma, thyroid, terrible lymphoma); neurogenic tumours belong to the posterior compartment.
Updated On: Jul 8, 2026
- Teratoma
- Neurogenic tumour
- Thymoma
- Lymphoma
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Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Understanding the Question:
The mediastinum is divided into anterior, middle, and posterior compartments, and each has its own typical set of masses. We need the option that does not belong in the anterior compartment list.
Step 2: Key Concept:
The classic causes of an anterior mediastinal mass are remembered as the "4 Ts": Thymoma, Teratoma (and other germ cell tumours), Thyroid mass (retrosternal goitre), and "Terrible" lymphoma. Neurogenic tumours, in contrast, arise from nerve tissue and are the most common cause of a posterior mediastinal mass.
Step 3: Detailed Explanation:
Teratoma is a germ cell tumour and is a classic anterior mediastinal mass, so option (A) belongs in the differential.
Thymoma arises from the thymus gland, which sits in the anterior mediastinum, so option (C) belongs in the differential.
Lymphoma commonly involves anterior mediastinal and hilar lymph nodes, so option (D) belongs in the differential.
Neurogenic tumours (such as schwannoma, neurofibroma, and neuroblastoma) arise from nerve roots and sympathetic chain, which lie in the posterior mediastinum, close to the spine, not the anterior compartment. So option (B) does not belong in the anterior mediastinal differential.
Step 4: Final Answer:
The mass that is NOT part of the anterior mediastinal differential is the neurogenic tumour, since it is a posterior mediastinal lesion.
\[ \boxed{\text{Neurogenic tumour}} \]
The mediastinum is divided into anterior, middle, and posterior compartments, and each has its own typical set of masses. We need the option that does not belong in the anterior compartment list.
Step 2: Key Concept:
The classic causes of an anterior mediastinal mass are remembered as the "4 Ts": Thymoma, Teratoma (and other germ cell tumours), Thyroid mass (retrosternal goitre), and "Terrible" lymphoma. Neurogenic tumours, in contrast, arise from nerve tissue and are the most common cause of a posterior mediastinal mass.
Step 3: Detailed Explanation:
Teratoma is a germ cell tumour and is a classic anterior mediastinal mass, so option (A) belongs in the differential.
Thymoma arises from the thymus gland, which sits in the anterior mediastinum, so option (C) belongs in the differential.
Lymphoma commonly involves anterior mediastinal and hilar lymph nodes, so option (D) belongs in the differential.
Neurogenic tumours (such as schwannoma, neurofibroma, and neuroblastoma) arise from nerve roots and sympathetic chain, which lie in the posterior mediastinum, close to the spine, not the anterior compartment. So option (B) does not belong in the anterior mediastinal differential.
Step 4: Final Answer:
The mass that is NOT part of the anterior mediastinal differential is the neurogenic tumour, since it is a posterior mediastinal lesion.
\[ \boxed{\text{Neurogenic tumour}} \]
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