Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Comparisons were made to prior study from ___ . There has been improved aeration of the airspace opacities within the right lung . Persistent opacities at the lung bases are seen . Cardiac size remains enlarged but unchanged . There is calcification in thoracic aorta . The endotracheal tube , nasogastric tube and PICC line are stable in position .
    OUTPUT:
    
Improved aeration of the airspace opacities at the lung bases .