A radiograph obtained on the sixth day of life showed diffuse abnormalities involving both lungs and completely obscuring the right cardiomediastinal border. In the left upper lung zone was a new opacity with air bronchograms.The opacification in the right hemithorax had progressed. These findings were thought to represent worsening atelectasis and edema
superimposed on the respiratory distress syndrome.Approximately 16 hours later, a chest radiograph showed progressive opacification of both hemithoraxes, new bilateral apical lateral opacities, and the appearance of pleural fluid.