FishMtFarm
Emu whisperer
Marek's is a horrible disease but many of us with it in our flock, do try to treat birds. I take the view that my flock has been exposed now anyway and those that are susceptible will have been infected. I've had some sick birds make miraculous recoveries and be unable to tell they were ever sick and some be able to return to free ranging with the flock after extended 3-4 months of support and TLC, but retain a limp. That said, if this bird has a tumour, there is unfortunately little chance of survival, but as the OP said, even a vet has been unable to say for sure if it is a tumour or abscess, so at the moment, the OP does not know and is supporting the sick bird as best they can.
I only euthanize once they lose interest in food, as they go downhill pretty quickly after that, but many people do not agree with euthanasia at all. You have to respect the individual's choice, as long as it is made with the good of the bird in mind.
@Engine823
Keeping my fingers crossed for you and Emily. Please keep us posted
You make a good point. I've seen mareks at the vet office and it usually comes down to putting the bird to sleep but I guess there are a lot of cases we don't see. I was just looking at this with how big the lump is on the back but TLC sometimes can work miracles. Thank you for sharing your story and experience.
Also try to offer Emily high iron foods like spinach or kale. Really helps with the healing process.