Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded and clear . Postoperative mediastinum , hila , and cardiac borders are normal . No pleural effusion or pneumothorax . Stable trace bilateral lower lobe scarring .
    OUTPUT:
    
No evidence of aspiration or pneumonia . Corn kernel unlikely to be seen on radiograph , if persistent clinical concern , CT of the chest could evaluate .