Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest demonstrate normal heart size . The mediastinal silhouette and hilar contours are normal . Bibasilar opacities likely reflect atelectasis . No pleural effusion or pneumothorax .
    OUTPUT:
    
Stable appearance of the chest with bibasilar opacities likely reflecting chronic atelectasis .