One month after undergoing a mammogram to educate "Good Morning America" viewers on the procedure, Amy Robach has announced the surprise diagnosis she received from that test. 

"It's still hard for me to say the words out loud. I have breast cancer," the 40-year-old "ABC News'" correspondent revealed. 

Robach agreed to the on-air mammogram as part of "GMA's" October Pink initiative to educate viewers on women's health issues. Her decision to have the test was made largely in part by her avoidance of it. 

"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?'"

Doctors told Robach, a mother of five, that her division to participate in the segment likely saved her life. 

"I was also told this, for every person who has cancer, at least 15 lives are saved because people around them become vigilant," she writes online. "They go to their doctors, they get checked. I can only hope my story will do the same and inspire every woman who hears it to get a mammogram, to take a self exam. No excuses. It is the difference between life and death."

As for treatment, Robach has elected to pursue a bilateral mastectomy - a procedure similar to the one that Angelina Jolie had earlier this year.  

"I've decided to be very aggressive," she says. "I'll have reconstructive surgery. And, we don't know. There's a lot you don't know until you have the surgery. I don't know about chemo. I don't know what stage I am. I don't know if it has spread. So we'll find out those things in the weeks to come."

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