Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size , mediastinal , and hilar contours are normal . The aortic knob is calcified , and coronary artery stents and calcifications are noted . The lungs are clear without pleural effusion , focal consolidation , or pneumothorax . There are unchanged degenerative changes of the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary process .