Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear . Cardiac silhouette is normal . The aorta is slightly tortuous . The patient is status post median sternotomy . A pace maker is present with a single lead terminating in the left ventricle . There is no pleural effusion , pneumothorax or pulmonary edema .
    OUTPUT:
    
No evidence of acute cardiopulmonary process .