Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is unchanged and remains at the high end of normal . Again , calcifications are seen within the arch of the aorta . Cardiomediastinal contours are unremarkable . Lung volumes are low but not significantly changed from the prior study ; however , bilateral pleural effusions are markedly improved on the left and somewhat better on the right . No pneumothorax . The position of the chest tube remains unchanged .
    OUTPUT:
    
Bilateral pleural effusions have decreased in size . Lungs appear to be better aerated .