Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A tracheostomy tube is in place . Increased retrocardiac airspace opacity is inseparable from the descending aorta , and may be due to worsening atelectasis , although infection or aspiration would be difficult to exclude in the appropriate clinical context . The right lung remains clear . There is no pneumothorax . Marked cardiomegaly despite the projection is unchanged .
    OUTPUT:
    
Increasing left basilar airspace opacification may be due to worsening atelectasis , aspiration or infection . However , a PA and lateral radiograph is suggested to exclude descending aortic pathology .