Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Thoracic aortic arch is tortuous with mild atherosclerotic calcifications . Hilar contours are unremarkable . Mildly increased interstitial markings are chronic . Lungs are otherwise clear . The pleural surfaces are clear without effusion or pneumothorax . No overt traumatic findings .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Mildly increased interstitial markings are unchanged and probably related to emphysema . No overt traumatic findings ; if there is focality on exam , rib series may be helpful .