Gayle, could they use a local anesthetic (a spray, maybe) and 'freeze' it out (or make it smaller) with a type of cryogenic probe? Is it reachable by any of those methods?

There is electric, laser and chemical cauterization (the chemical is silver nitrate, and seems to be the least favoured). Can't hurt to ask.

HUGS and I hope Sasha gets better soon. Hugs to your kitties also!