<prompt> The most likely diagnosis in a newborn who had a radiopaque shadow with an air-fluid level in the chest along with hemivertebrae of the 6th thoracic vertebra on plain X-ray isCongenital diaphragmatic herniaOesophageal duplication cystBronchogenic cystStaphylococcal pneumonia  <response>: Air-fluid level on the chest in a neonate with hemivertebrae suggests the diagnosis of esophageal duplication cyst. 