Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Status post median sternotomy with unchanged appearance of sternotomy wires and aortic valve replacement . In comparison most recent prior radiograph there is increased opacity at the left base , likely representing atelectasis and effusion . Mild cardiomegaly is unchanged . Subtle interstitial opacities are consistent with mild pulmonary edema . No focal consolidation or pneumothorax is present .
    OUTPUT:
    
1 . No pneumonia . 2 . Small left pleural effusion with associated atelectasis and mild pulmonary edema are new from ___ .