Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Sternotomy , AVR . Decreased pulmonary vascularity , heart size since prior exam . There is small left pleural effusion , improved . Improved left basilar atelectasis . Possible trace right pleural effusion . . Chronic right rib fractures . There are aortic calcifications .
    OUTPUT:
    
Interval mild improvement .