Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The mediastinal and hilar contours are within normal limits . The pulmonary vasculature is normal . No focal consolidation , pleural effusion or pneumothorax is identified . Minimal atelectasis is seen in the left lung base . Multilevel mild degenerative changes are noted in the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .