Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP view of the chest provided . Left - sided chest tube has been removed . Since prior study from 1 day ago , the left apical pneumothorax is significantly smaller . The left lingular and lower lobe opacity has increased , which could reflect atelectasis or early pneumonia . Right lower lobe opacity still persists . Left upper mediastinal opacity is stable , but still obscuring the aortic arch , and could be atelectasis versus hematoma .
    OUTPUT:
    
1 . Significantly smaller left apical pneumothorax . 2 . Worsening left lingular and left lower lobe opacity , likely atelectasis versus early pneumonia . 3 . Persistent left upper mediastinal opacity , likely atelectasis or hematoma .