Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal view of the chest demonstrates the ET tube ending 3 .9 cm above the carina . A left internal jugular approach central venous catheter has tip along the mid brachiocephalic vein . The heart is top normal in size . Perihilar vascular markings are prominent , suggestive of mild edema . There is retrocardiac opacity which may represent a small pleural effusion with associated atelectasis , although supervening infection can not be excluded . There is trace atelectasis in the right base .
    OUTPUT:
    
1 . ET tube in appropriate location . 2 . Left internal jugular central venous catheter has tip in the mid brachiocephalic veins . 3 . Mild interstitial edema with atelectasis and or concurrent pneumonia .