Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . Left basilar atelectasis , likely representing atelectasis or aspiration . Lungs are otherwise clear . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities . There are remote left rib fractures .
    OUTPUT:
    
Left basilar atelectasis or aspiration . Otherwise , no acute cardiopulmonary abnormality .