Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The endotracheal tube ends 2 cm above the carina . The orogastric tube ends off of the radiographs . There are bibasilar linear opacities . There is no pleural effusion or pneumothorax . The aorta is calcified . The heart size is normal .
    OUTPUT:
    
1 . Linear bibasilar opacities most likely represent atelectasis , however superimposed infection can not be excluded . 2 . Appropriately positioned endotracheal and orogastric tubes .