He had started eating again, so much that we were scheduled to get the tube removed, then suddenly stopped again.
After a very traumatic workday yesterday (those who keep after my Twitters know what was going on), I took Darwin to the vet again today. They performed an ultrasound and more x-rays, and found nothing. Their advice was to continue with the tube feeding, give him some more appetite stimulant, and antibiotics.
I had the hard discussion with the vet, and he was optimistic about Darwin’s condition, as they found no signs of lymphoma.