Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . The aorta is mildly unfolded . Mediastinal and hilar contours are within normal limits . Pulmonary vasculature is normal . Minimal atelectasis is seen in the retrocardiac region . Lungs are otherwise clear without focal consolidation . No pleural effusion or pneumothorax is present . Remote appearing bilateral rib fractures are present . Left shoulder arthroplasty hardware is incompletely imaged .
    OUTPUT:
    
No acute cardiopulmonary abnormality .