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 is –
Air-fluid level on the chest in a neonate with hemivertebrae suggests the diagnosis of esophageal duplication cyst.
Congenital diaphragmatic hernia
Oesophageal duplication cyst
Bronchogenic cyst
Staphylococcal pneumonia