Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate normal lung volumes . Right lung base opacities slightly more conspicuous since prior . No pleural effusions , or pneumothorax is seen . Hilar and mediastinal silhouettes are unremarkable . Heart size is normal . There is no pulmonary edema . Mild right - sided healing rib fractures are redemonstrated .
    OUTPUT:
    
Right lung base opacity , is slightly more conspicuous since ___ exam and may represent atelectasis , aspiration or infection in the appropriate clinical setting .