Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and aortic valvular replacement . The heart size remains mildly enlarged , and the aorta is tortuous and calcified . There is no pulmonary edema . There is continued elevation of the right hemidiaphragm which is chronic . Minimal streaky opacity in left lung base likely reflects chronic changes , with no new areas of focal consolidation seen . There is no pneumothorax or pleural effusion . No acute osseous abnormality is seen .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Chronic changes within the left lung base and unchanged elevation of the right hemidiaphragm .