Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The aorta remains tortuous . Mediastinal and hilar contours are unchanged with mild enlargement of the left pulmonary artery again noted . Pulmonary vasculature is normal . Lungs are hyperinflated . No focal consolidation , pleural effusion or pneumothorax is seen . Minimal subsegmental atelectasis is noted in the left lower lobe . Mild degenerative changes are seen in the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .