Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy and CABG . Cardiac silhouette size is top normal . Mediastinal and hilar contours are unchanged . Pulmonary vasculature is not engorged . Minimal atelectasis is re - demonstrated in the lung bases without focal consolidation . No pleural effusion or pneumothorax is demonstrated . There are no acute osseous abnormalities .
    OUTPUT:
    
No substantial interval change from the prior study with continued mild bibasilar atelectasis .