Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is mild bibasilar atelectasis . No definite focal consolidation is seen . The cardiac silhouette is top - normal to mildly enlarged . The mediastinal contours are stable and unremarkable . Aortic knob calcification is seen . Degenerative changes are seen at the right greater than left bilateral acromioclavicular joints .
    OUTPUT:
    
Top - normal to mildly enlarged cardiac silhouette and mild basilar atelectasis .