Last month, ABC anchor Amy Robach underwent a mammogram screening on-the-air during a segment for Good Morning America to promote Breast Cancer Awareness month. On Monday morning, Robach revealed that the screening found evidence of cancer and she will be undergoing a double mastectomy on Thursday.

"That mammogram just saved your life," doctors told Robach, who wrote a post detailing her ordeal. She wrote:

On Thursday, Nov. 14, I will go into surgery where my doctors will perform a bilateral mastectomy followed by reconstructive surgery. Only then will I know more about what that fight will fully entail, but I am mentally and physically as prepared as anyone can be in this situation.

Robach, who is 40, said she had been putting off a mammogram for a year, but was encouraged to do the segment by co-worker Robin Roberts who survived her own bout with breast cancer last year. "Every producer, every person who urged me to do this, changed my trajectory," she added. Robach hopes her story and the fight ahead of her raises awareness to other women. She explained:

I was also told this, for every person who has cancer, at least 15 lives are saved because people around them become vigilant. 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.

The New York Times reports that Robach will be taking a leave of absence, while she undergoes treatment. Below is video of Monday's GMA segment where she made the announcement:

video platformvideo managementvideo solutionsvideo player

Click here to follow The Atlantic Wire.

More from The Atlantic Wire:

Christie on Time's Fat Joke: 'Who Cares?'

MTV Censored Miley Cyrus Smoking Onstage, Now You'll Never Know About It

A 900-Page Novel About '70s New York Snagged a Nearly $2 Million Book Deal