Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A tracheostomy tube remains in place . Right - sided PICC line ends at superior cavoatrial junction . The patient is status post cervical spine fusion . There is no pneumothorax . The bilateral costophrenic angles have been excluded from the field of view . The visualized lungs are clear . Unchanged retrocardiac opacification may be due to aspiration or atelectasis . The heart and mediastinum are within normal limits despite the projection .
    OUTPUT:
    
Unchanged retrocardiac airspace opacity at the left base may be due to atelectasis or aspiration . Exclusion of the costophrenic angles from the field of view limits evaluation of pleural effusions .