Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and CABG . Left PICC tip terminates in the SVC . Heart remains moderately enlarged , unchanged . Mediastinal contours are stable . Mild pulmonary edema appears slightly progressed in the interval . Small left pleural effusion persists . Retrocardiac opacity could reflect infection or atelectasis and persistent right basilar patchy opacity is noted . No pneumothorax is demonstrated . No acute osseous abnormality is identified .
    OUTPUT:
    
Worsening mild pulmonary edema . Bibasilar opacities , more pronounced on the left , could reflect infection or atelectasis . Small left pleural effusion , unchanged .