Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with prior radiographs performed on same day on ___ at 08 :02 , there has been interval collapse of the right lower lung , with mediastinal shift towards the right , likely reflecting mucous plug . Left basilar atelectasis is similar to prior . No pneumothorax . Left pleural drain is unchanged .
    OUTPUT:
    
Right lower lung collapse , with mediastinal shift towards the right , likely reflecting mucous plug .