Hi,
I just read about Hagrid. What a beautiful kitty! I'm wondering why the Clinic with the advanced technology cannot go in and do a guided needle biopsy first before doing a surgery. Do you have a Specialty Hospital nearby, or is this a clinic where they treat critical care animals? A Board Certified Vet would be able to do a needle biopsy and diagnosis. It may be more difficult in a rural area with being near one of the Specialty Hospitals. I know you've spent a lot of money, and I had to do the same before finding the right clinic and Vet. Hugs to Hagrid and you.