Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear within normal limits . There is possible trace pleural effusion on the right in the posterior costophrenic angle versus possible atelectasis . There are streaky retrocardiac opacities , probably due to minor atelectasis or airway inflammation , perhaps slightly increased . Mild rightward convex curvature is centered along the mid thoracic spine .
    OUTPUT:
    
Streaky new opacity in the left lower lobe , probably due to atelectasis or airway inflammation . Developing pneumonia seems less likely but short - term follow - up radiographs could be considered to reassess .