Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: An ET tube is present , tip in satisfactory position 2 .3 cm above the carina . The right IJ central line is present -- the tip is obscured by overlying structures , but likely lies over the mid SVC , unchanged . Heart size at the upper limits of normal . There is upper zone redistribution , but I doubt overt CHF . No focal infiltrate or effusion is identified . No pneumothorax detected . Compared with 1 day earlier , I doubt significant interval change .
    OUTPUT:
    
Doubt significant interval change .