Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: ET tube is in appropriate position with its tip 3 cm above the carina . Retrocardiac opacity is seen . Diffuse opacity overlying the right hemi thorax is consistent with a layering effusion . No pneumothorax . Heart size is normal or mildly enlarged .
    OUTPUT:
    
ET tube in appropriate position . Retrocardiac opacity may represent atelectasis or pneumonia . Small to moderate layering right pleural effusion .