Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Persistent left basilar opacity noted . There is persistent mild cephalization with small left pleural effusion . No right pleural effusion . Stable mild cardiomegaly . Mediastinal contour and hila are unremarkable . Aortic arch calcifications are present .
    OUTPUT:
    
1 . Left basilar opacity likely represents a combination of pleural effusion and atelectasis . Superimposed infection can not be excluded . 2 . Stable mild vascular congestion with mild cardiomegaly .