Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with prior radiographs on ___ , there has been interval collapse of the left upper lobe , worrisome for a mucous plug in the known narrowed left bronchial stent . The endotracheal tube terminates 2 .5 cm above the carina . There is a left chest tube with no pneumothorax . Upper mediastinal and right neck vascular stents are again seen . There Are surgical clips in the right axilla .
    OUTPUT:
    
Left upper lobe collapse , worrisome for mucous plugging in the narrowed left bronchial stent .