Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette is mildly enlarged . The aorta is tortuous . There is slight blunting of the posterior right costophrenic angle which may be due to a trace pleural effusion . No pneumothorax is seen . No focal consolidation is seen in the right lung . Subtle opacity at the left lung base may relate to overlap of vascular structures versus early / focal pneumonia .
    OUTPUT:
    
Trace right pleural effusion . Subtle opacity at the left lower lung may represent overlap of structures or focal pneumonia .