Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Again noted is the retrocardiac opacity without significant change since ___ . Cardiac size is enlarged an unchanged . Mild vascular congestion in bilateral bases . Aortic tortuosity again seen . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
No significant changes in retrocardiac opacity since ___ . Mild vascular congestion and bilateral bases .