Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear . No pulmonary edema , pleural effusion , pneumothorax , or pneumonia . Mild bibasilar atelectasis is noted . The heart size is top normal . There is unfolding of the thoracic aorta . The hilar contours and pleural surfaces are unremarkable . Bony structures are intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
No acute intrathoracic process .