Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs were obtained . The patient is status post median sternotomy and CABG . There are prominent interstitial markings as well as bronchovascular crowding accentuated by low lung volumes . No focal opacity is seen . The cardiac silhouette is mildly enlarged . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
No focal opacity . Prominent interstitial markings , mild pulmonary edema can not be excluded .