Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is mild bibasilar atelectasis . The heart is mildly enlarged , stable compared to prior studies . Median sternotomy wires and extensive mediastinal clips are unchanged . There is no pneumothorax , large pleural effusion , overt pulmonary edema , or focal opacification suspicious for pneumonia .
    OUTPUT:
    
Mild cardiomegaly is stable . No evidence of pneumonia .