The final diagnosis is different to the first one. He has chondrosarcoma, which I understand is a cancer of the cartilage, which it seems is a better prognosis.
They can operate to remove the tumour, but this will involve removal of a good portion of his face on that side and possibly the removal of his eye, but they will not know that until they commence surgery.
I am happier about this finding, in that at least they can do something for him. He is on the list for surgery.
I will keep you all updated.
Thanks for all your good wishes.