
I never knew this was possible until I showed my sister-in-law, a nurse anesthetist, an x-ray taken of my upper leg and pelvis showing the upper end of a titanium rod in my femur, which also included a shadowy flesh rod and associated danglers visible in on the x-ray.
Naively, I wasn't really paying attention to those shadows in the image. I did not realize what they were until I showed it to her and she pointed it out. I stopped showing that image around after that.