Breast Ultra sound question

[dmdav]

I have been followed for about 5 years for a "benign lesion" in one breast that always appeared stable.  My recent mammo showed it had enlarged a bit.  I was sent for an ultra sound with the findings of a 5mm mass with mixed echogenicity.  It is mostly hypoechoic with a small hyperechoic nodule along the anterior surface and is exceptionally vascular. I was told that it could be a fibroadenoma or an active lymph node.  I will be having a breast biopsy.  The more I read about either of these, the more I'm worried that it doesn't sound like either.  Do you have any thoughts?  What could be there stable for so many years and then become worrisome? Thanks for any info you can help me with.

[dmdav]

My Birad score is 4.  

[Cleveland Clinic]

Dear Dmdav:  Without reviewing the mammogram and ultrasound, it is impossible to speculate on what this might be.  Often, the radiologist will assign a BIRAD score to the mammogram that will suggest the level of suspicion.  You may want to check with your doctor to see what the opinion of the radiologist is regarding the level of suspicion – although this information is certainly not diagnostic.  A biopsy will be the best way to determine what this may be.