why. why did you choose to do that? i went back to chicago, sat with my doctors and walked through why we made that decision. i also talked to a young girl, the youngest ever to have a double mastectomy because she carries the same brca gene. >> it starts with a lump or shadowy figure on a black and white screen. >> this, we know is cancer. >> that's how it happened to me. >> any other spots in either breast can be the same thing, they can be benign, malignant, we really don't know. >> all the doctors know for sure, this one dot of my left breast has encapsulated cancerous cells. called ducto carcinoma incite. the most common form of innovative breast cancer. all of the white blobs and blue blips could signal more cancer or be nothing at all. >> you have a four to five times greater risk to develop breast cancer than the average woman.