Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been near - complete opacification of the left lung with shift of the mediastinum to the left , consistent with left lung collapse . A small portion of the left upper lobe remains aerated , which may be partly reflective of bullous changes in this area . The right lung remains clear . There is no pneumothorax .
    OUTPUT:
    
New complete collapse of the left lung .