Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . There are low lung volumes . Patchy left base retrocardiac opacity is seen which could relate to atelectasis , although an underlying consolidation is not excluded . There is no pleural effusion or pneumothorax . The cardiac silhouette is likely accentuated due to low lung volumes , however , appears borderline to mildly enlarged .
    OUTPUT:
    
Low lung volumes . Patchy left base retrocardiac opacity could relate to atelectasis , although pneumonia is not excluded in the appropriate clinical setting .