I have a cat who has just turned 15
She's been relatively healthy over the years, nothing serious healthwise, although she's started to slow down a bit the last couple of years and her days are mostly spent snoring.
A few weeks ago, she was taken ill. We came down one morning to find her quite distressed, she had collapsed and seemingly lost about half her body weight over night. We rushed her to the vet who discovered she was also almost, if not completely blind
Over the next few weeks she regained her weight and has been happily pottering round the house, mooching around the garden and generally getting on quite well. She hasn't regained her sight but we've lived here 10 years so she knows the house, we're careful about always putting food/litter trays, etc in the same place and she seems to be coping fine.
We've had some blood tests to rule out anything simple and easily treatable which have all come back clear, so the vet thinks she has a brain tumour. The only way to confirm it 100% is to have an MRI scan, then if the scan confirms it she would need an operation followed by chemo.
We had decided (with the full support of the vet) that we would manage any pain/discomfort but seek no further treatment - she's getting on a bit, such an operation followed by the chemo would be too much for her to cope with at 15, there's no guarantees that any of this would work and it would be cruel to put her through it. We also decided not to have the MRI - there is no scanner locally so she'd have to travel some distance and she'd have to be sedated, so we came to the conclusion that if we wouldn't be going for the op/chemo there would be no point in the scan.
However, DH has since changed his mind and wants to go for the scan/op/chemo.
The cat is insured so ££ isn't a consideration here, I personally believe that it's not in the cats best interest to but her through the treatment