Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Relatively low lung volumes noted with streaky bibasilar opacities felt most likely to represent atelectasis . Superiorly , the lungs are clear . There is no pneumothorax . The cardiomediastinal silhouette is stable . Median sternotomy wires and mediastinal clips are again noted . No displaced fractures identified .
    OUTPUT:
    
Bibasilar opacities most likely atelectasis . No displaced rib fractures on this nondedicated exam .