Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear within normal limits . The lungs appear clear . There are no pleural effusions or pneumothorax . Cholecystectomy clips project over the right upper quadrant . The stomach does not appear distended . The colon is aerated and an aerated viscus in the left upper quadrant suggesting redundancy of the sigmoid . Persistent enteric contrast from the prior CT performed on ___ is noted . There is no free air .
    OUTPUT:
    
No free air . Persistent retained enteric contrast in the colon .