Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy . The cardiac silhouette is mildly enlarged and the aortic knob is calcified . There are diffuse reticular opacities seen in both lung fields suggestive of mild interstitial edema . The cardiomediastinal silhouette and hilar contours are unchanged . The pleural surfaces are normal without effusion or pneumothorax .
    OUTPUT:
    
Stable cardiomegaly and mild interstitial edema .