Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: An initial radiograph demonstrates proximal right mainstem intubation . A subsequent radiograph obtained 18 minutes later demonstrates withdrawal of the endotracheal tube which now terminates 2 .9 cm above the carina . Aside from some minimal left basilar atelectasis , lungs are well expanded and clear . No pleural effusion or pneumothorax . Heart size is normal . Cardiomediastinal and hilar silhouettes are unremarkable .
    OUTPUT:
    
The final radiograph demonstrates an endotracheal tube terminating 2 .9 cm above the carina .