Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP chest radiograph demonstrates the endotracheal tube approximately 5 cm from the carina . The right internal jugular central venous line is at the cavoatrial junction . Bilateral interstitial opacities are essentially unchanged and concerning for ARDS . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Unchanged lines and tubes , and bilateral interstitial opacities .