Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is top normal . Mediastinal and hilar contours are unremarkable . The pulmonary vasculature is normal . There has been interval improvement in aeration of the left lower lobe with resolution of the previously demonstrated left lower lobe contusion . Remainder of the lungs are clear . No pleural effusion or pneumothorax is seen . Subacute left inferior rib fractures are re - demonstrated .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Resolution of previously noted left lower lobe contusion and effusion .