Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest film ___ at 21 :41 is submitted .
    OUTPUT:
    
Endotracheal tube has its tip 3 cm above the carina . The right internal jugular central line has its tip in the distal SVC near the cavoatrial junction . The pulmonary vasculature is now indistinct suggesting interval appearance of mild interstitial edema . Overall cardiac and mediastinal contours are stable given differences in technique . No large effusions . Retrocardiac opacity may reflect a small hiatal hernia or possibly atelectasis . This can be better assessed on followup imaging .