Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A tracheostomy tube projects over the superior mediastinum at the midline . A right - sided pacemaker with single lead is unchanged in position . Heart size is normal in size . The mediastinal and hilar contours are normal , and stable . Asymmetric , ill defined opacity noted in the left lung raises potential concern for multifocal pneumonia , though a component of scarring or atelectasis may contribute . . Note is made of some basilar opacities , suggestive of atelectasis .
    OUTPUT:
    
Asymmetric , ill defined opacity noted in the left lung raises potential concern for multifocal pneumonia , though a component of scarring or atelectasis may contribute to this appearance .