Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A new medial right lower lobe opacity may be due to atelectasis or pneumonia . No pneumomediastinum or subcutaneous air is detected . The heart size , mediastinum , and hila are stable . The left lung is clear . No pneumothorax . Unchanged midline tracheostomy tube , terminating 5 .8 cm above the carina .
    OUTPUT:
    
A new medial right lower lobe opacity may be due to atelectasis , or pneumonia , in the correct clinical setting .