Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well inflated . Persistent left retrocardiac opacities and left pleural effusion , with mild interval improvement compared to the prior radiograph . Unchanged patchy opacities in the right mid zones . Stable cardiomegaly and tortuosity of the thoracic aorta . Persistent degenerative changes of the thoracic spine .
    OUTPUT:
    
Interval mild improvement in left retrocardiac opacities and left pleural effusion . Unchanged marked cardiomegaly .