"ABC News" and "Good Morning America" correspondent Amy Robach, currently recovering from aggressive breast cancer surgery, is feeling extremely fortunate to have discovered the disease early. The 40-year-old agreed to undergo the first televised mammogram on Oct. 30 to raise awareness about testing, only to find that she tested positive for breast cancer.

"I'm 40 years old. I've never had a mammogram," she said. "I've avoided it. And I started thinking, 'Wow, if I've put it off, how many other people have put it off as well?'"

Robach's decided to treat the cancer with an aggressive bilateral mastectomy, saying that only surgery would truly give doctors an idea of its severity. In an update to her ABC colleagues, she revealed why that move turned out to be the right one. 

"My prognosis is good, I got very lucky finding the cancer through our ABC-sponsored mammogram and I got lucky choosing an aggressive approach, bilateral mastectomy, because while in surgery last week my surgeon found a second, undetected malignant tumor," she writes. "No MRI, no mammogram, no sonogram had found it … it was only through the mastectomy that she discovered it. My cancer had spread to my sentinel lymph node, but not beyond, so I will have more treatments ahead of me, but none that will take me out of work."

Robach says that she will make her return on Dec. 2. 

"Physically and emotionally I have been through the ringer, but I am emerging on the other side so much stronger," she writes. "I have a greater appreciation for life, for health and for how such simple acts of kindness can be so incredibly powerful. I am looking through a different lens now … and I am thankful for that as well. There was my life before October 30th and now my life after."

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