Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Slightly limited evaluation due to overlying external artifacts . The endotracheal tube is appropriately positioned with the tip terminating 4 .7 cm above the carina . There is mild pulmonary interstitial edema . Apparent widening of the mediastinum is likely due to AP technique and supine positioning . The cardiac silhouette is mildly enlarged , likely due to AP view . There is no pleural effusion or pneumothorax . There is no definite free air under the diaphragm .
    OUTPUT:
    
1 . Endotracheal tube in appropriate position terminating 4 .6 cm above the carina . 2 . Mild pulmonary interstitial edema .