Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: An ET tube terminates 4 .3 cm above the carina . Moderate cardiomegaly is again seen . The lungs are underinflated , resulting in bronchovascular crowding . Mild pulmonary vascular congestion and mild interstitial edema are improved since ___ . There is improved aeration of the upper zones in comparison to the 5 : 18 a .m . study performed today . There is no pneumothorax . A persistent left lower lobe opacity may represent pleural effusion and / or atelectasis .
    OUTPUT:
    
1 . Improved mild interstitial edema and central pulmonary vascular congestion . 2 . Improved upper zone aeration . 3 . Appropriately positioned ET tube .