Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are well inflated and clear . Cardiomediastinal and hilar contours are unremarkable . Cardiac size is normal . There is no pleural effusion or pneumothorax . The aorta is minimally tortuous with some atherosclerotic calcifications noted at the aortic knob .
    OUTPUT:
    
No evidence of acute cardiopulmonary process .