Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . There are slightly low lung volumes . Subtle left base retrocardiac opacity could relate to atelectasis , although in the appropriate clinical setting an early consolidation due to infection is not excluded . The right lung is clear . There is no pleural effusion or pneumothorax . The cardiac silhouette is top normal . Mediastinal and hilar contours are unremarkable .
    OUTPUT:
    
Subtle left base retrocardiac opacity could relate to atelectasis , although in the appropriate clinical setting an early consolidation due to infection is not entirely excluded .