Thanks for your thoughts everyone.
They're doing a biospy first, rather than go into the major surgery - and will go from there.
When my sister got into her car accident, she was just 20 years old and she was hundreds of miles from home, no family near by, in a strange place, no idea what was going on, in and out of consciousness, needing immediate, urgent, major surgery not even sure how the accident happened (turns out the kid that was driving fell asleep and they went tumbling off the side of a mountain in West Virgina. ) - and had to get airlifted, first to another major hospital in North Carolina and eventually back to Massachusetts. She was extremely, extremely lucky to have lived, spending a long time in a wheelchair and needing years of PT.
So she's actually taking this little "blip" all in stride,- as here she is, in a hospital 20 minutes from home in a small private hospital, her own family doctor taking care of her -this is easy for her! Even with the unknowns!