Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright chest radiograph demonstrates an endotracheal tube with its tip located 5 cm from the carina . An NG tube projects over the stomach , with its tip not seen . The lungs are clear with the exception of mild retrocardiac atelectasis . The pleural surfaces are normal . The cardiac silhouette remains markedly enlarged , the mediastinal contours are normal .
    OUTPUT:
    
No acute chest abnormality . Standard position of support devices .