Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are relatively low lung volumes . Right base opacity is seen likely representing combination of pleural effusion and atelectasis , underlying consolidation is not excluded . The cardiac silhouette is enlarged . The right aspect of the cardiac silhouette is not well assessed due to the right base opacity . Aortic knob is calcified . There is mild pulmonary vascular congestion . No pneumothorax is seen .
    OUTPUT:
    
Right base opacity likely represents combination of pleural effusion and atelectasis , underlying consolidation is not excluded . Pulmonary vascular congestion .