Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy and CABG . Moderate to severe enlargement of the heart size is re - demonstrated , unchanged . Mediastinal contour is similar with central venous congestion again noted . Hazy opacities are noted involving the perihilar regions and lung bases bilaterally in a relatively symmetric fashion , perhaps slightly worse in the left mid lung field compared to the previous radiograph . No pneumothorax is present . No large pleural effusion is identified . There are no acute osseous abnormalities .
    OUTPUT:
    
Bilateral hazy opacity involving the perihilar regions and lung bases , perhaps slightly worse in the left mid lung field compared to the prior study . Findings may reflect mild pulmonary edema superimposed on a background of chronic interstitial lung disease which was better assessed on the prior CT chest . No large pleural effusion .