Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal view of the chest were obtained . Three subsequent radiographs were obtained . Final radiograph demonstrates endotracheal tube terminating 6 .3 cm above the carina . OG tube terminates within the stomach . Heart size is stable . New retrocardiac opacity may represent atelectasis or aspiration . Right base opacity is compatible with atelectasis . No pleural effusion or pneumothorax .
    OUTPUT:
    
1 . New retrocardiac opacity may represent atelectasis or aspiration . 2 . Final radiograph demonstrates endotracheal tube to terminate 6 .3 cm above the carina .