Murphy has an intussusception, which requires surgical correction. They will biopsy it, but they don't have any reason to think it's cancerous. While they are "in the neighborhood" they will also take a biopsy of healthy bowel to see if he has Irritable Bowel Disease. All of his other organs looked fine.
He goes under the knife tomorrow, spends the night at the hospital, and comes home on Friday. He is home right now, and just chowed down on a big early dinner. Tomorrow we go through the same drill - no breakfast, and drop him at the vet at 7:30.
I'm concerned about him having surgery, of course, but compared to the first bleak suspicions, this is not so bad at all. Thank you all for all of your prayers, energy, good wishes and good thoughts - please keep them up through his surgery and recovery!