Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs were obtained . Lungs are clear . The cardiac silhouette is mildly enlarged . The hilar contours and pleural surfaces are normal . There is no pleural effusion or pneumothorax . Atherosclerotic calcifications are again noted at the aortic arch .
    OUTPUT:
    
No acute cardiopulmonary process .