Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . Status post median sternotomy . Moderate cardiomegaly persists . There is mild interstitial pulmonary edema . No pleural effusion or pneumothorax is seen . The aorta is calcified and tortuous .
    OUTPUT:
    
Moderate enlargement of the cardiac silhouette and mild interstitial edema .