Clues for diagnosing misplaced central venous catheter in the right ascending lumbar vein during right femoral venous access

The right ascending lumbar vein is difficult to detect on anteroposterior abdominal radiographs because it overlaps with the inferior vena cava on anteroposterior radiographs. Intensive observation by medical providers may be a cue for diagnosis. However, knowledge of catheter misplacement of the right ascending lumbar vein is also necessary, because misplacement cannot be suspected without that awareness.