What a horrible and terrible shock for you, Jen, I'm truly sorry. I never even considered something this serious, I was thinking more along the lines of not knowing quite what was wrong despite the ultrasound. You know Lucas and so only you know what is best for him, but I must ask why you have decided not to use chemotherapy since cats do well on it, usually, and don't have as many side issues as humans. Give him an extra kiss on the nape for me, that place is so soft, and try to indulge both of you in plenty of special time together.