Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Evidence of previous CABG . Endotracheal tube in situ with the tip 46 mm proximal to the carina . NG tube in situ . Cardiomegaly . Interval improvement in the bilateral perihilar alveolar airspace opacification / alveolar edema . Left lower lobe atelectasis with associated effusion unchanged .
    OUTPUT:
    
Slight interval improvement in the pulmonary edema .