Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As before , the patient is status post median sternotomy , coronary artery stenting and CABG . Mild unchanged cardiomegaly . The aorta is tortuous and diffusely calcified . The mediastinal and hilar contours are unchanged . The pulmonary vasculature is normal . Lungs are clear . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities . As before , degenerative changes are noted in the imaged thoracolumbar spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .