Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP semi-upright portable chest radiograph obtained . An NG tube is seen with its tip descending below the left hemidiaphragm with its tip not included in the imaged field . The endotracheal tube is also seen with its tip residing just less than a centimeter above the carina . Retraction by at least 1 - 2 cm is advised for more optimal placement . Bibasilar opacities could represent atelectasis versus pneumonia .
    OUTPUT:
    
1 . Low position of the endotracheal tube , for which at least 2 cm retraction is advised . 2 . NG tube positioned appropriately . 3 . Bibasilar opacities could represent atelectasis versus pneumonia . The possibility of aspiration not excluded .