Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The mediastinal and hilar contours are normal . Low lung volumes . Apparent vascular congestion is likely secondary to low lung volumes . There may be bibasilar atelectasis . No pleural effusion . No pneumothorax . There are no acute osseous abnormalities .
    OUTPUT:
    
No acute cardiopulmonary abnormality .