Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size remains mildly enlarged . The aorta is unfolded , as seen previously . Mediastinal and hilar contours are unchanged . Pulmonary vascularity is not engorged . Minimal streaky opacity in the left lung base likely reflects atelectasis . No focal consolidation , pleural effusion or pneumothorax is present . There are mild degenerative changes noted in the thoracic spine .
    OUTPUT:
    
Left lower lobe atelectasis . No focal consolidation to suggest pneumonia .