Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is top normal . Mediastinal and hilar contours are within normal limits . The pulmonary vasculature is normal . No focal consolidation , pleural effusion or pneumothorax is demonstrated . Patchy opacities are seen in the lung bases , likely areas of atelectasis . Degenerative changes with hypertrophic spurring are again seen involving the thoracic spine .
    OUTPUT:
    
Bibasilar patchy opacities , likely atelectasis .