Hello and welcome to the forum. We're sorry about these findings as I'm sure that this makes you nervous. We want to tell you that a BiRad score of 4 does not mean cancer specifically but that they need to evaluate further. Bi Rad scores go from 0 (no cancer) to 6 (certain to be cancer). The finding of 7 cm is large and that is the concerning element, I'm sure. Size of tumor, if this is indeed a tumor, is used for staging of cancer.
Can you let us know about any follow up that has taken place?