Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: New heterogeneous opacity adjacent to the right heart border , which could be post surgical air in the mediastinum or unusual atelectasis . It should be followed until it can be identified or results . No pneumothorax or pleural effusion is identified . Port -a- Cath is seen with the tip terminating in the right atrium , close to the tricuspid valve . There is no IJ catheter seen on this film and upon discussion with the service intern , it was clarified that there was no IJ placement . The cardiomediastinal silhouette appears normal . A drain is seen in the right upper quadrant .
    OUTPUT:
    
1 . Unusual postoperative pneumomediastinum or atelectasis . Radiographic follow - up advised . 2 . Port -a- Cath is seen with tip terminating in the right atrium , close to the tricuspid valve . 3 . No evidence of pneumothorax or pleural effusion .