Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear . There is mild cardiomegaly and surgical changes from prior cardiac operation . There is an aortic arch stent and an artificial aortic valve . There is dense calcification of the ascending aorta . There is no pneumothorax . There is no pleural effusion . Pulmonary vascularity is normal .
    OUTPUT:
    
No acute cardiopulmonary process .