Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . The aorta is mildly unfolded . The mediastinal and hilar contours are normal . Pulmonary vasculature is normal . The lungs are clear without focal consolidation . No pleural effusion or pneumothorax is identified . Chronic rib fractures of the left posterior fifth , sixth , and seventh ribs are noted .
    OUTPUT:
    
No acute cardiopulmonary abnormality .