Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post aortic valve replacement and probably coronary artery bypass graft surgery as well as placement of fixation plates along the sternum . The cardiac , mediastinal and hilar contours appear unchanged . There is no pleural effusion or pneumothorax . A mild background interstitial abnormality appears unchanged . The bones appear demineralized . Mild superior endplate compression deformity along an upper thoracic vertebral body with sclerosis is also unchanged .
    OUTPUT:
    
No evidence of acute cardiopulmonary disease .