Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is minimal right lower lung atelectasis . The lungs are otherwise clear . The heart size is normal . The ascending thoracic aorta is slightly tortuous . The mediastinal contours are otherwise normal . Note is made of a saber - sheath configuration of the trachea . There are no pleural effusions . No pneumothorax is seen .
    OUTPUT:
    
No acute cardiac or pulmonary findings .