Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded and clear . Pleural surfaces are normal without pleural effusion or pneumothorax . The heart is mildly enlarged , however , is unchanged from prior study . Mediastinal and hilar contours are normal . Atherosclerotic calcification of the aortic arch noted . Visualized osseous structures are unremarkable .
    OUTPUT:
    
No evidence of acute cardiopulmonary process . Specifically , no evidence of pneumonia .