Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar structures are normal . There is no evidence of superimposed consolidations to suggest pneumonia . Postoperative changes of known lung nodules in the left lung base are unchanged . There are no pleural effusions or pneumothorax .
    OUTPUT:
    
No radiographic evidence of an acute cardiopulmonary process .