Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A stent is seen overlying the trachea extending from the superior margin of C7 to the superior aspect of T2 vertebral bodies . A sharply marginated opacity projecting over the mid thorax may be external to the patient , recommend repeating radiograph ensuring that nothing is obscuring the patient . Otherwise , no significant change from prior with no focal consolidation , effusion , or pneumothorax and stable appearance of the cardiomediastinal silhouette .
    OUTPUT:
    
1 . Tracheal stent overlies C7 and T1 vertebral bodies . 2 . Sharply marginated opacity over the mid thorax likely external to the patient , recommend repeating the radiograph ensuring that nothing is obscuring the patient .