MRI and nipple piercings??

Cassandra
So I have to get an MRI done of my pituitary gland to see if I have a benign brain tumor. 
I got my nipples pierced in the beginning of January, so they're not fully healed yet. 
I really don't want to take them out, because I know they will close up and then that's $90 down the drain. 
What will happen if I leave them in during a head MRI?