Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: ET tube is in adequate position . The distal end of the NG tube is hard to assess on this chest x-ray . Moderate interstitial edema is unchanged . The lung volumes are low and there is increased opacity at the left lung base , which could reflect atelectasis , aspiration or pneumonia . Pleural effusions are small if any . There is no pneumothorax . Moderate cardiac contour enlargement is stable .
    OUTPUT:
    
1 . Moderate pulmonary edema is stable . 2 . Left lower lobe opacification is new since yesterday , which could reflect atelectasis , pneumonia or aspiration .