Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal with mildly tortuous aorta . The hilar contours are unremarkable . There is mild bibasilar atelectasis . The lungs are otherwise clear . There is no pleural effusion or pneumothorax . The osseous structures are grossly unremarkable .
    OUTPUT:
    
No acute intrathoracic process .