Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Endotracheal tube terminates 4 .7 cm above the carina . Left retrocardiac opacity may represent atelectasis , although aspiration or infection could have a similar appearance . No other focal consolidation . No sizable pleural effusion or pneumothorax . Cardiomediastinal contours are normal . No acute osseous abnormalities identified . Lower right ribs are excluded from the field of view laterally .
    OUTPUT:
    
1 . ETT terminates 4 .7 cm above the carina . 2 . Left retrocardiac opacity may represent atelectasis or aspiration .