Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a new left basilar patchy opacity . Left lower lobe atelectasis and collapse largely unchanged , left - sided volume loss with mild left hilar shift . No pneumothorax is seen .
    OUTPUT:
    
New left basilar opacity which could represent pneumonia in the right clinical setting . Mucous plug or aspiration could be considered in light of new left basilar opacity and left lower lobe collapse .