reoccuring neuroma

Hi,
My beloved 12yrs female sheltie/mix has had a neuroma removed from the same spot 2 times in the past 3yrs. The first time it almost sprung up overnight.It was removed within a week of it showing.It was a very low level malignancy.
The 2nd time it was much slower. The doc wanted to watch it for a little while but it seemed to start growing rapidly agin and was removed. Agin the same exact place ,the exact same thing and the same level of malignancy. She is otherwise very healthy and in great shape for her age.
What exactly is this and why is it reoccuring in the exact same spot?
Any info would be great....
Thanks , Theresa

[Jim Humphries, B.S., D.V.M.]

What's the spot??  

If this same cell type continues to re occur then we are not getting it all.  You may want to discuss some other therapies with your veterinarian besides excision.  A consult with a veterinary oncologist at a veterinary teaching hospital may be in order.  

[StormyRenee]

Thanks so much for your response....
It is on her right front elbow area.