The ultrasound imaging has ruled out the FOD idea. It's a cancerous mass, if one were to interpret and believe what was written by the Docs above.

Given where the mass is and how the cat is reacting, the early best prognosis of fatal pancreatic cancer is probably very correct.

I believe this to be a losing battle for everyone involved. Do what is best for the cat and his current well being.

Sometimes it's better to let go then try to hang on, especially when the outcome will ultimately be the same.