Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Compared to prior study , there is new left lower lung opacity , likely due to volume loss . The right heart border also appears to be displaced medially and although there is some obliquely of the patient , mediastinal shift related to the left lower lung volume loss is certainly a possibility , most likely due to mucus plugging . Left subclavian line , endotracheal tube , and enteric tube are in unchanged positions .
    OUTPUT:
    
New left lower lung opacity associated with likely left - ward mediastinal shift , altogether suggesting volume loss due to mucus plugging .