Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP chest film dated ___ at 21 :46 is submitted .
    OUTPUT:
    
The patient is status post median sternotomy . The heart is enlarged which may reflect cardiomegaly , although pericardial effusion can not be excluded . There is perihilar vascular congestion with no overt pulmonary edema . More focal patchy airspace opacity is seen at the right base which would be concerning for pneumonia or aspiration , less likely atelectasis . Clinical correlation is advised . No pneumothorax .