I have a 17 year old cat, Polly, who has been under treatment for hyperthyroidism & high blood pressure for around two years. Her kidneys started showing signs of disease a few months ago too and she arthritits.
For a number of years she had a cyst whoch was periodically drained but this has changed and, yesterday, my vet confirmed that it is a tumour and he felt positive that it is malignant.

He said that the lump should be removed and that he would *probably* be able to remove all of the tissue. I was quoted around £500 for the op.
I really don't know whether to go for the surgery or not. Clearly she is elderly, so any surgery has risks but she has so many other conditions as well that I am not sure if surgery is the route we should take. We have no way of knowing at this time if cancer will have spread anywhere else and I am waiting for urinalysis results to get a better idea of the progress of the kidney disease.
In herself she seems quite happy; she eats well, comes for cuddles and will still wander around the garden.
So, do I operate thus possibly removing one of a few conditions, or do I opt to keep her happy and comfortable for as long as possible without surgery?