Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Again , the endotracheal tube is low , approximately 1 .3 cm from the carina . An enteric tube is present with the tip in the stomach . A left subclavian central venous catheter is present with the tip in the low SVC . The lung volumes are low , limiting evaluation . A retrocardiac opacity is likely due to atelectasis . There is no new focal airspace opacity or pulmonary edema . There is no pneumothorax . There may be a small left pleural effusion , which is unchanged . There is no right pleural effusion . The cardiomediastinal silhouette is unchanged .
    OUTPUT:
    
1 . Unchanged low position of the endotracheal tube , 13 mm from the carina . 2 . Unchanged retrocardiac opacity , likely a combination of atelectasis and possibly a small left pleural effusion .