Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest radiograph was provided . There is a right IJ central venous catheter with its tip in the region of the mid SVC . Patient appear somewhat rotated . There is a retrocardiac opacity which is better assessed on subsequent CT . The right lung appears clear . No large pneumothorax . Heart size is difficult to assess . Bony structures are grossly intact .
    OUTPUT:
    
Appropriately positioned right IJ central venous catheter . Retrocardiac opacity better assessed on subsequent CT abdomen pelvis .