Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild right lower lobe opacity is likely atelectasis . Right hemidiaphragm is elevated . There is no pneumothorax or pleural effusion . Cardiomediastinal silhouette is normal size . There is no pneumoperitoneum . A catheter is noted in the right upper abdomen .
    OUTPUT:
    
No evidence of pneumoperitoneum .