The Fur Baby Doctor's performed another Ultrasound and said that Beau's Heart/Lung/Chest area appears to be clear - so that's good news!
However, the mass was too large and blocking the valve to the small intestine, and his condition had deteriorated over the weekend so they wouldn't do a biopsy or tumour removal as it was too dangerous.
They have done needle aspirate instead with inconclusive results. :( and the best guess at this point is Lymphoma.
The good news is, if that is the case, Prednisone should reduce it sufficiently enough within the next week to alleviate the worst of the symptoms, hopefully allowing him to eat and toilet independently again and start his recovery.
So for now, I will continue to manually feed Beau every three hours, four times a day with liquidised food high fat high protein food with a vitamin B paste added. He will also continue to receive twice daily pain relief.
If this works, he should be functioning more normally come Monday.
It is now a waiting game...
I'll update again soon.
In the meantime here is a photo of Beau when he was well, looking his regal and haughty best :)