Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours are unremarkable except for aortic knob calcifications . Heart size is normal . Pulmonary vascularity is normal . Lungs are clear . No pleural effusion or pneumothorax is present . No acute osseous abnormalities are demonstrated .
    OUTPUT:
    
No acute cardiopulmonary process .