Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate normal cardiomediastinal silhouette . The lungs are clear . There is no pneumothorax or pleural effusion . The airway is midline . No radiopaque foreign body is demonstrated in the location of the esophagus or airway . Subsequently shown lower esophageal retained food bolus is radiographically occult .
    OUTPUT:
    
No acute cardiopulmonary process .