Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left subclavian central line has its tip in the low SVC , unchanged from the prior examination . Nasogastric tube is seen coursing below the diaphragm with the tip not identified . The ET tube is approximately 5 .2 cm above the carina . Low lung volumes with bilateral airspace opacities are noted . This is consistent with pulmonary edema , improved since most recent prior examination . Retrocardiac opacity may represent atelectasis ; however , pneumonia can not be excluded in the correct clinical setting . There is no pneumothorax . Mild cardiomegaly , increased since most recent prior examination .
    OUTPUT:
    
1 . Improved mild pulmonary edema . 2 . Consolidation within the retrocardiac region may represent atelectasis ; however , pneumonia can not be excluded in the correct clinical setting .