Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size remains mild to moderately enlarged . Mediastinal and hilar contours are similar . Pulmonary vasculature is normal . Mild atelectasis is noted in the lung bases . Lungs remain hyperinflated with flattening of the diaphragms suggestive of COPD . Pulmonary vasculature is not engorged . No focal consolidation , pleural effusion or pneumothorax is present . There are mild degenerative changes in the thoracic spine . Degenerative changes are seen involving both glenohumeral and acromioclavicular joints .
    OUTPUT:
    
Mild bibasilar atelectasis . COPD .