A quick update on me:
I've had blood drawn, and I underwent an ultrasound and just yesterday a CT scan. They think it's a cyst, but I'm still waiting for the CT scan results to come back to confirm that's all it is. I have a consultation with my doctor on Friday, probably just to refer me to a specialist.
Now, you know as much as me! They don't like to give you too much information. Maybe they're afraid you'll explode.
And I feel fine.