Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and CABG . Left base atelectasis is changed . Opacities in the right middle lobe are also stable since the prior study , probably compatible with scarring and atelectasis . There are no new opacities which are concerning for pneumonia . There is no evidence of pneumothorax or pulmonary edema . There is no pleural effusion . Cardiomediastinal silhouettes are stable .
    OUTPUT:
    
No significant interval change . No convincing evidence of acute cardiopulmonary process .