Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval placement of an endotracheal tube , terminating approximately 6 cm above the level of the carina . The cardiac and mediastinal silhouettes are stable . Status post median sternotomy and stenting of the descending aorta again noted . There is improved aeration of the left lung base . The lungs remain hyperinflated . No large pleural effusion is seen although trace pleural effusion would be difficult to exclude . No pneumothorax . No pulmonary edema .
    OUTPUT:
    
Status post endotracheal tube placement , with tube terminating approximately 6 cm above the level are the carina . Improved aeration of the left lung base . No large pleural effusion is currently seen although trace pleural effusion would be difficult to exclude .