MRI ordered after oncologist saw CT results

I am 3 years post diagnosis this week!  Yay!  But my celebration has been halted.  At the end of January I had an US after mentioning discomfort under my ribs on my right side.  It feels like a fist is being shoved under there.  I've had a stable hemangioma since 2006 and it was viewed on my cardiac MRI a year and a half ago still stable.  However, the US revealed a significant growth and 3 new lesions.  So of course, a CT was ordered.  But it was not a liver protocol CT.  The results were that each lesion enhanced slightly differently but the radiologist was fairly certain they were all hemangiomas despite the differences in enhancement and size.  

So, I saw my PA oncologist Friday feeling really great about everything.  The first shock...a brain MRI was ordered d/t persistant nausea since Dec.  Originally, I blamed this on the bulging eardrum I had for 2 months.  Then, when that resolved I thought it was from the liver crap.  But evidently, this can also be caused by neurological issues.  And since I've had persistent occular vertigo (although currently resolved), the brain is the next place to look.  Okay.  I'll go along with that.

Then the second "whoa!" moment.  I waited a little longer to actually see my oncologist since I hadn't laid eyes on her in a year and a half and she was expected to walk into the office shortly.  There's a part of me that wishes I'd just left and had my brain MRI.  Instead, she read the CT of the liver and immediately became concerned.  She didn't like what she read or how it was just left as probably hemangiomas.  I'm sure with my young age she wants to be certain.  And I didn't realize it at the time but MRI is more diagnostic of hepatic metastases especially if hypervascular which breast cancer often is.

So here are my questions.  Has this happened to anyone else out there?  Has anyone ever developed new hemangiomas?  What could be the cause of the previously stable hemangioma suddenly growing from 3.2 X 3.8 cm to now 4.4 X 4.6 cm?  What was your outcome?  

Should I be concerned?  My oncologist questioned my lack of concern, but I told her I don't want to jump to conclusions until I know exactly what I'm facing.  But that got me worried, that she was and I wasn't.  She is the expert after all.

Thank you for helping me sort this out.  I know I won't have definitive answers until after my MRI's this Thursday evening.  But to me knowledge is power.  I can deal with it if I know what I'm dealing with.

Thank you again!