Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Unchanged positioning of the tracheal stent , projecting over the thoracic inlet . The increased retrocardiac opacity may reflect atelectasis and / or consolidation . No pleural effusion or pneumothorax identified . The size of the cardiomediastinal silhouette is within normal limits .
    OUTPUT:
    
New retrocardiac opacity may reflect atelectasis and / or consolidation .