Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is stable mild cardiomegaly . The hilar and mediastinal contours are unchanged . There has been slight interval improvement in the bilateral diffuse pulmonary edema . No new focal consolidations concerning for infection are identified . There is no pneumothorax . There are small bilateral pleural effusions . The patient is status post median sternotomy . The visualized osseous structures are otherwise unremarkable .
    OUTPUT:
    
Mild interval improvement of the diffuse bilateral pulmonary edema compared to the prior exam .