So Glitch has a kidney tumor.

[Starbuck]

i understand that you want to be really aware of your options, but is he not eating or otherwise acting sick? If not, you may still have time to come up and save up some money to deal with whatever decision you need to make.

If you cannot afford the surgery (which is absolutely reasonable given the expense), i would definitely talk to either of the veterinarians about the cost of a necropsy. It may give you some piece of mind, and they may be able to tell you more about the etiology of the tumor. Good luck and i wish you peace of mind with these difficult decisions you have to make