Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Mediastinal and hilar contours are unremarkable . The pulmonary vascularity is not engorged . Minimal patchy opacity in the right middle lobe likely reflects atelectasis . No focal consolidation , pleural effusion or pneumothorax is present . There are mild degenerative changes in the thoracic spine . No free air is noted under the diaphragms .
    OUTPUT:
    
Mild right middle lobe atelectasis . No free air under the diaphragms .