Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiograph demonstrates borderline cardiac enlargement . Patient is status post median sternotomy . Wires appear intact . No focal opacity convincing for pneumonia is identified . There is no overt pulmonary edema , pleural effusion , or pneumothorax . Osseous structures demonstrates no acute abnormality .
    OUTPUT:
    
No opacity identified convincing for pneumonia .