[dila813]

high frequency magnets, MRI still works, it just will fog up near the metal but the metal would show nice and bright. The MRI would be a golden find, if someone gets it and posts it, they are a hero. More than likely, the MRI will show nothing since the only thing up that butt is rice (and his high school sweet heart's dad shot him with rock salt from a shot gun inserted therein, likely this made it easier for the rice to make it there in the first place)

[Jewels1091]

This includes pins, screws, plates, scrapnel, clips and dental braces, but also jewelry and body piercing. Magnetic metals may get bent or moved out of place, while non-magnetic metals will tend to heat up.

[randog]

high frequency magnets, MRI still works, it just will fog up near the metal but the metal would show nice and bright.

That's my guess, too. The metal will distort the field.