Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Mediastinal and hilar contours are unremarkable . The pulmonary vascularity is normal . Except for minimal atelectasis in the left lung base , the lungs are clear without focal consolidation . No pleural effusion or pneumothorax is present . There are multilevel degenerative changes in the thoracic spine . Remote left posterior rib fracture is again seen .
    OUTPUT:
    
No acute cardiopulmonary abnormality .