Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: When compared to most recent radiograph dated ___ , there is improved aeration of the left lung . However , persistent opacification and leftward mediastinal shift in addition to right lung hyperexpansion is consistent with left lung collapse . There is increased opacity of the right lower lobe with obscuration of the right hemidiaphragm . While this may reflect atelectasis , infection can not be excluded . There is likely a small left pleural effusion . There is no pneumothorax . Redemonstration of anteriorly dislocated right shoulder as well as third and second right rib fractures , present previously .
    OUTPUT:
    
1 . Persistent left lung collapse though better aerated . 2 . Right lower lung opacification which may reflect atelectasis though infection can not be excluded . 3 . Unchanged right anterior shoulder dislocation and multiple right sided chronic rib fractures .