Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs volumes are slightly low but clear . The cardiomediastinal silhouette , hilar contours and pleural surfaces are normal . There is no pleural effusion or pneumothorax . Hyperdense material within partially imaged bowel in the mid abdomen likely reflects retained barium .
    OUTPUT:
    
Slightly low lung volumes . No evidence of aspiration .