BIRADS 4 question

I had a mammogram and ultrasound done earlier this week.  The results came back with "BIRADS 4, Suspicious."  The mammogram showed no evidence for breast neoplasia.  The ultrasound however shows two cysts (one palpable - pea size).  "One is simple and superficial measuring 5mm in diameter.  The adjacent cyst is complex with internal densities and blood flow."

1)  How do I know if this is BIRADS 4a, 4b, or 4c?
2)  I can't find a great amount of information on cysts with blood flow, however; what I've found suggest that malignancies do have blood flow to them as they require sugars and oxygen.  Where can I find more information on blood flow?

I'm scheduled to see a breast surgeon.  The more I know the less fear I have as knowledge is power.  Thanks!

[japdip]

A BIRADS 4 score indicates the need for a biopsy of some type. A,B or C would really not change this need. The additional letters are not often used. A Complex cyst has more than one outer layer and cysts can contain either liquid or solid or even both. Blood flow does not always indicate malignancy. I'm certain the Breast Surgeon will be able to answer more of your concerns. Write everything down and take the list with you for reference when you see him/her. Knowledge is power but this is better obtained from your own Physicians who have your complete history as well as test results on which to base the answers.  Regards ....