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 newborn has a posterior mediastinal cystic mass with several veebral anomalies. The most likely diagnosis would be which of the following?
assistant
The correct answer is  Neuroenteric cyst / esophageal duplication cyst is round or tubular lesion occurring in the lower posterior mediastinum, which often disto esophagus but only rarely communicate with the esophageal lumen a chest x-ray may show a right-sided mediastinal mass and associated veebral anomalies like hemiveebra, block veebra, butterfly veebra or spina bifida, if present.