I can understand your concern it is always scary to hear the word "suspicious"
Basically it could mean there is area that could be something other than normal breast tissue.
IT could be a :
~cyst and the biopsy could show them if it has fluid or solid.
~growth of some sort
Remember 80% of the time it is nothing.
The reason they have to do the needle biopsy is because the ultrasound can show somethings but it is sorta a fuzzy black and white picture and just isn't clear enough.
Try not to worry. I know that is easier said then done but you only have a 20% chance of it being anything.
If it was cancer it would be detected so early that prognosis would be good.
You can read more here:http://www.cancer.org/docroot/CRI/content/CRI_2_6X_Mammography_and_other_Breast_Imaging_Procedures_5.asp?sitearea=
Let me know if you have more questions.
I am here to help.