Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post coronary artery bypass graft surgery and aortic valve replacement . The mediastinal and hilar contours appear unchanged . There is a persistent left basilar opacity suggesting scarring associated with prior surgery . This is also a mild new interstitial abnormality suggesting mild fluid overload , although otherwise the lungs appear clear . Mild right lateral pleural thickening is unchanged . There is no pleural effusion or pneumothorax . Bony structures are unremarkable .
    OUTPUT:
    
Findings suggesting mild vascular congestion .