Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is stable scarring at the left lung base but the lungs are otherwise clear . The hilar cardiomediastinal contours are normal . There is no pneumothorax or pleural effusion . Pulmonary vascularity is normal . Old rib fractures again noted on the right .
    OUTPUT:
    
No evidence of acute cardiopulmonary process .