Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is marked change in the chest x-ray findings as compared to the earlier study . There is opacification of the lower ___ of the left hemithorax and there is abrupt cut off of the left mainstem bronchus approximately 3 cm from the carina . There is mediastinal shift to the left and this is consistent with atelectasis , possibly related to a mucous plug . The right lung is clear . There is no pneumothorax . Nasogastric tube tip is in the stomach .
    OUTPUT:
    
1 . There is marked change in the chest x-ray findings as compared to the earlier study . There is opacification of the lower ___ of the left hemithorax and there is abrupt cut off of the left mainstem bronchus approximately 3 cm from the carina . There is mediastinal shift to the left and this is consistent with atelectasis , possibly related to a mucous plug . 2 . The right lung is clear . 3 . There is no pneumothorax . 4 . Nasogastric tube tip is in the stomach .