Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is mildly enlarged . The mediastinal and hilar contours appear unchanged . Patchy calcification is similar along the aortic arch . There is a vascular stent projecting adjacent to the aortic arch . There is no pleural effusion or pneumothorax . The lungs appear clear . Slight degenerative changes are similar along the thoracic spine . There is a prior non-displaced right sixth rib fracture with remodeling .
    OUTPUT:
    
Mild cardiomegaly . No evidence of acute disease .