Posterior mediastinal tumours are
**Core Concept**
Posterior mediastinal tumors are a group of neoplasms that arise from the structures located in the posterior mediastinum, which includes the esophagus, vertebral bodies, sympathetic chains, and intercostal nerves. These tumors can be benign or malignant and often present with symptoms such as back pain, dysphagia, and Horner's syndrome.
**Why the Correct Answer is Right**
The posterior mediastinum is a common site for neurogenic tumors, such as schwannomas and neurofibromas, which arise from the Schwann cells that surround the nerve fibers. These tumors can grow rapidly and cause compression of adjacent structures, leading to symptoms such as pain and neurological deficits. The correct answer is likely a type of neurogenic tumor.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because neuroendocrine tumors are more commonly associated with the anterior mediastinum.
**Option B:** This option is incorrect because thymomas are typically found in the anterior mediastinum.
**Option C:** This option is incorrect because lymphomas can occur in any part of the mediastinum, but are not as commonly associated with the posterior mediastinum as neurogenic tumors.
**Clinical Pearl / High-Yield Fact**
When evaluating a patient with a posterior mediastinal mass, it's essential to consider the possibility of a neurogenic tumor and to obtain imaging studies such as MRI or CT scans to assess the extent of the tumor and its relationship to adjacent structures.
**Correct Answer: A. Neurogenic tumors**