Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are normally expanded and clear . The cardiomediastinal silhouette and hilar contours are normal . There is no pleural effusion or pneumothorax . The airways appear patent without evidence of radiopaque foreign body .
    OUTPUT:
    
No evidence of acute cardiopulmonary abnormality . No radiopaque foreign body detected , but cartilaginous fish bones are generally not radioopaque . There are no indirect signs of a retained bone , but if clinical findings warrant , contrast swallow would be required .