Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval placement of endotracheal tube which courses toward the right mainstem bronchus , low in position and should be withdrawn approximately 5 .5 cm for more optimal positioning . Subtle patchy right base opacity is again seen , slightly less conspicuous as compared to the prior study . The left lung is clear . No pleural effusion or pneumothorax is seen . The cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
Low lying endotracheal tube coursing toward the right mainstem bronchus . Recommend withdrawal by approximately 5 .5 cm for more optimal positioning . Dr . ___ is aware .