Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Heart size is borderline enlarged . Mediastinal and hilar contours are unchanged . Pulmonary vasculature is normal . Minimal patchy opacity in the left lung base likely reflects atelectasis . No focal consolidation , pleural effusion or pneumothorax is present . Anterior bridging osteophytes are noted in the lower thoracic spine .
    OUTPUT:
    
Low lung volumes with patchy opacity in the left lung base , likely atelectasis .