I'm very sorry! First of all, let me welcome you to this place, you'll find a lot of support and advice here!

I hope the lump will turn out to be something else. Believe me, I know exactly what you're going through right now. Three months ago, I detected a lump between my Luna's shoulder blades, and immediately thought of a vaccine-related fibrosarcoma. It scared me to death and I cried for days. Luna was almost ready for surgery, but then we decided to watch the lump for a little while. It got smaller, so it's very unlikely that it's a fibrosarcoma! My vet thinks it's a harmless reaction to an antibiotic shot.

Best wishes to you and your cat, please keep us updated!

Kirsten