Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac and mediastinal silhouettes appear within normal limits . Mild vascular calcifications are seen at the aortic arch . There no focal pulmonary opacities , pleural effusions , or evidence pneumothorax . Osseous structures appear unremarkable .
    OUTPUT:
    
No evidence acute cardiopulmonary disease . No appreciable interval change compared to ___ .