From my understanding Anchors and microdermal implants are treated like a normal piercing but are to be considered permanent because of the tissue that grows into the holes in the jewelry.
My question is: If you have to go to am MRI, CT scan or Xray what do you do?
A friend of mine was in a car wreck and the emergency team cut out her plugs and surface bars because they needed to perform these tests. I understand that timing may  mean everything in these situations but I would be upset if they didnt just take them out of me, unscrew the balls or take off the rubber bands. Doesn't seem that hard, though I would imagine anchors would have to be cut out...

Yeah, they need to be outted with a scalpel as far as I know. Though there was something I was reading about one that can be massaged until they come out. Seems to be so many varitations of the jewellry around, guess that's what it comes down to. Pararmedics mightn't know enough about taking the jewellry out to do it quickly.

most quality jewelry should be made non-ferrous metals. put a magnet next to your jewelry. if it moves in the slightest, you probably bought it at hot topic.

I definitely agree.. Remove the cap, maybe put a bandage or some sort of tape over it, and they should be fine.
I can't imagine how they could simply be massaged out, unless they were either not healed yet, or they were those awful fish hook looking ones... don't use those... lol.
It's just logic, if you've seen a dermal anchor (not the evil fish hook ones) the base is about 5 mm long, and 3 mm wide. the hole is 2 mm'ish.... the only way that can ever come out is by enlarging that hole.

In the case of micro dermals,most of them are made of titanium so would have little or no effect on mri's etc.Also as far as removal,a scalpel is not the proper tool for the job,it'd be overkill.All thats needed is a needle and someone that knows what they're doing.