Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size remains mildly enlarged but unchanged . The mediastinal and hilar contours are similar . No pulmonary edema is present . Atelectasis is demonstrated in the lung bases without focal consolidation . No large pleural effusion or pneumothorax is identified . Degenerative changes are noted involving both acromioclavicular joints .
    OUTPUT:
    
Mild bibasilar atelectasis .