Hi I never had that done.But i wonder why your doc just has you trying Dilantin and that is it? They are not going to try any other meds before they do the psr. That seems really odd. How much dose your neuro know about t.n.? how many times have they done psr with good results? I would think they would try other meds first like neurontin or tegrotol or something else besides just dilantin.
I would love to help you with question but i cant have any surgeries or even an mri anymore so that part soome one else will have to help with.
I am sorry you are dealing with this t.n. monster pain but we are glad you found n.t. and I want to welcome you to this forum . I will see if i can scare up some others and get them to come by and post if they can help.
You take care and best of luck. keep us posted when you can
PEACE
BMW