Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are relatively low lung volumes . The cardiac silhouette is mildly enlarged . Mediastinal and hilar contours are stable . No focal consolidation , pleural effusion , evidence of pneumothorax is seen . There is no evidence of pneumomediastinum . No displaced fracture is seen .
    OUTPUT:
    
Mildly enlarged cardiac silhouette , appears slightly larger as compared to the prior study , although this may relate to lower lung volumes . No focal consolidation , pneumothorax , or pneumomediastinum .