Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Allowing for AP technique , the cardiac , mediastinal and hilar contours appear unchanged including mild unfolding of the thoracic aorta . The heart is normal in size . The lungs appear clear . There are no pleural effusions or pneumothorax . The lateral view is somewhat limited , particularly with respect to visualization of more anterior structures , because the arms are down . The osseous structures are unremarkable .
    OUTPUT:
    
No evidence of acute disease .