Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged , unchanged . The aorta is mildly tortuous with atherosclerotic calcifications noted at the aortic knob . Mediastinal and hilar contours are similar and the pulmonary vasculature is normal . Lungs are clear . No pleural effusion or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
No acute cardiopulmonary abnormality .