Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A frontal semi-upright view of the chest was obtained portably . The endotracheal tube ends 2 cm above the carina and could be pulled back to avoid bronchial intubation . The nasogastric tube follows the expected course , although the tip is not visualized . There are diffuse bilateral opacities , which may be due to pulmonary edema but underlying infection can not be excluded . The heart is upper limits of normal in size . There is no pleural effusion or pneumothorax on this supine view . No displaced rib fracture is seen .
    OUTPUT:
    
1 . Endotracheal tube ends 2 cm above the carina and could be slightly pulled back to avoid bronchial intubation . 2 . Pulmonary edema but supervening infection can not be excluded .