Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . The lungs are mildly hyperexpanded . Slightly increased density over the inferior spine on the lateral view without correlate on the frontal view may represent atelectasis , but early or developing infection can not be excluded . No pleural effusion or pneumothorax . Heart size is normal . Mediastinal silhouette and hilar contours are normal .
    OUTPUT:
    
Mildly increased opacity projecting over the spine on the lateral view may represent early or developing infection in the appropriate clinical setting .