Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: 2 supine portable AP chest radiographs were obtained during placement of the endotracheal tube approximately 16 minutes apart . The first film demonstrates right mainstem intubation with complete whiteout of the left lung . The second film was obtained 16 minutes later shows retraction of the endotracheal tube with its tip now positioned approximately 1 .4 cm above the carina . There is interval expansion of the left lung . The NG tube resides in the left upper abdomen with its tip positioned only approximately 5 cm beyond the GE junction . Advancement of the NG tube may result in more optimal positioning . The cardiomediastinal silhouette appears grossly unremarkable . No bony abnormalities are seen .
    OUTPUT:
    
1 . Low position of ET tube positioned 1 .4 cm above the carina . Please retract by at least 1 cm for more optimal positioning . 2 . NG tube tip just beyond the GE junction and can be advanced for more optimal positioning . 3 . Aerated lungs post retraction of ET tube .