Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Re - demonstrated are diffuse bilateral interstitial and alveolar opacities , not significantly changed over the interval . The heart remains enlarged . There bilateral pleural effusions , greater on the left . The endotracheal tube tip ends 6 .7 cm from the carina .
    OUTPUT:
    
1 . Stable diffuse pulmonary opacities . 2 . Endotracheal tube ends 6 .7 cm from the carina . This should be advanced for more secure seating .