Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is mildly enlarged . The mediastinal contours are within normal limits with calcified atherosclerotic disease of the aortic knob . The lungs are clear . There is no large pleural effusion or pneumothorax .
    OUTPUT:
    
Cardiomegaly , but no acute cardiopulmonary process .