They vet ran her blood work, which had been normal the week before, and found some pretty bad liver numbers. They were, the vet said, consistent with a liver tumor or lymphoma. I guess hyperthyroidism can mask these conditions.
Given that CC was 18, I was not going to put her through chemo or surgery. I elected for palliative care. That was Thursday. On Saturday I had to put her to sleep.
I'm coping with this better than I coped with Piglet's death. I think it's because it's not the same roller-coaster, where she was at death's door several times and then bounced back. CC had a normal life right up until her last hours.
But damn, how I miss her, and how quiet and empty the house feels without cats.