Amy Robach, an anchor for ABC News, found out she had breast cancer thanks to undergoing a mammogram for her show, and after aggressively treating the cancer, found a second malignant tumor during surgery.

According to the Los Angeles Times, during Robach's bilateral mastectomy, it was determined that she had a second malignant tumor that had originally gone undetected.

The news anchor wrote in an email to co-workers, "While in surgery last week my surgeon found a second, undetected malignant tumor. No MRI, no mammogram, no sonogram had found it. ... It was only through the mastectomy that she discovered it."

Robach added that the cancer had "spread to my sentinel lymph node," meaning she still has a way to go before she is fully recovered. She does plan on returning to ABC News Dec. 2.

As previously reported, Robach underwent a mammogram during a piece on Breast Cancer Awareness month where she discovered she had cancer.

She wrote on the ABC News blog, "That day, when I was asked to do something I really didn't want to do, something I had put off for more than a year, I had no way of knowing that I was in a life-or-death situation."

Shortly after her diagnosis she told her viewers that she had decided to deal with the problem head on and have reconstructive surgery.

image: ABC