Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is mildly enlarged , and a left cardiac pacer device is seen with its leads in the appropriate position in the right atrium and ventricle . The patient is status post median sternotomy and aortic valve replacement . Lungs are clear of focal consolidations , pleural effusions or overt pulmonary edema .
    OUTPUT:
    
Mild cardiomegaly without pulmonary edema .