Preschooler with cough and fever Pediatric Imaging Chest March 1, 2021February 24, 2021 CXR PA (left) shows a large round opacity located medially in the left hemithorax which is located posteriorly on the lateral (right) over the spine (spine sign). The diagnosis was esophageal duplication. Related Published March 1, 2021February 24, 2021