Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac , mediastinal and hilar contours are within normal limits . Pulmonary vasculature is not engorged . Lung volumes are low with patchy atelectasis noted in the lung bases . No focal consolidation , pleural effusion or pneumothorax is identified . There are mild degenerative changes noted in the thoracic spine . Left subdiaphragmatic lucency likely reflects gas within a colonic loop of bowel .
    OUTPUT:
    
Low lung volumes with patchy atelectasis in the lung bases .