Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single AP portable view of the chest was obtained . The patient is status post median sternotomy . Patient is rotated to the right . The cardiomediastinal silhouette is grossly stable . Chronic changes are again seen at the right lung base , similar in appearance as compared to the ___ image from ___ . Rounded medial left base retrocardiac opacity is again seen , likely corresponding to patient 's hiatal hernia . The left lung is clear . There is no pleural effusion or evidence of pneumothorax .
    OUTPUT:
    
No significant interval change compared to scout view from chest CT from ___ .