Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is top - normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . Lungs are clear except for linear bibasilar atelectasis or scar . No pleural effusion or pneumothorax is seen . Posterior lumbar fusion hardware is seen . Dual - chamber pacer projects over the heart .
    OUTPUT:
    
No acute cardiopulmonary abnormality .