system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 40-year-old man has a routine CXR, which reveals a posterior mediastinal mass. Which of the following is the most likely diagnosis?
assistant
The correct answer is  Neurogenic tumors are the most common posterior mediastinal masses. Other posterior mediastinal masses include meningoceles, meningomyeloceles, gastroenteric cysts, and esophageal diverticula. Common anterior mediastinal masses include thymomas, lymphomas, teratomas, and thyroid masses. Middle mediastinal masses include vascular lesions, lymph nodes, and pleuropericardial and bronchogenic cysts.