Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear . There is tortuosity of the thoracic aorta with calcifications in the arch . There is no pneumothorax or pleural effusion . Hilar and cardiomediastinal contours are otherwise normal . Pulmonary vascularity is normal .
    OUTPUT:
    
No acute intrathoracic process .