Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single AP view of the chest demonstrates an unchanged position of tracheal stent . The heart and mediastinal contours are stable . There is no pleural effusion or pneumothorax . There is no focal consolidation concerning for pneumonia seen on the radiograph . Again seen is a left Port - A - Cath with tip terminating in the proximal left brachiocephalic vein . Postoperative changes after upper lobectomy are again seen .
    OUTPUT:
    
No pneumonia on chest x-ray . Tree - in - ___ opacities and mucous plugging seen in the right lower lobe on the recent CT are not clearly observed on these radiographs and are probably too subtle to visualize radiographically .