Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right - sided Port - A - Cath tip terminates in the SVC . The patient is status post median sternotomy and aortic valve replacement . Moderate enlargement of cardiac silhouette persists . Mediastinal and hilar contours are unchanged . There is persistent mild to moderate pulmonary edema , slightly improved compared to the prior study , superimposed on a background of chronic interstitial abnormality . There is a background of emphysema noted as well . Small right pleural effusion appears relatively unchanged with chain sutures in the right lung base compatible prior resection . Old fracture of the left posterior 7th rib and partial resection of the right 5th rib are again noted . Widening of the left acromioclavicular joint is chronic and may be postsurgical .
    OUTPUT:
    
Mild to moderate pulmonary edema which is slightly improved compared to prior study , superimposed on a background of chronic interstitial abnormality . Small right pleural effusion .