Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is stable appearance of the postoperative cardiomediastinal silhouette and hilar contours . Bibasilar opacities are likely atelectatic in nature however infection can not be excluded given appropriate clinical circumstance . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Bibasilar opacities which are likely atelectatic however infection can not be excluded given the appropriate clinical circumstance .