Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were reviewed and compared to the prior study . Right internal jugular vein catheter tip ends in the distal superior vena cava and is unchanged in location . Compared to the prior study there is a new retrocardiac opacity . The cardiac silhouette is slightly more prominent compared to the prior study . The mediastinal contour is normal and there is no evidence of pleural effusions or pneumothorax . No concerning osseous or soft tissue lesions .
    OUTPUT:
    
New retrocardiac opacity could represent overlapping soft tissues ; however , in the appropriate clinical setting it could represent pneumonia .