ABC News' Amy Robach offers update on her health ABC News' Amy Robach, who discovered she had breast cancer after undergoing what she thought was a routine mammogram for a piece she was filming for "Good Morning America," said she is on the mend and plans to return to work in a couple of weeks. On Friday, Robach sent an e-mail to her colleagues at ABC News, thanking them for their support and offering an update on her health that was positive, though with a chilling development. Since her diagnosis, Robach chose an aggressive treatment, which included a bilateral mastectomy. She wrote, "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. Though she said her prognosis is good, "[m]y 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 said her plan is to return to work on Dec. 2. The mammogram she filmed for the "GMA" segment was Robach's first, and she had been persuaded to undergo the exam by co-host Robin Roberts, a cancer survivor. "Physically and emotionally I have been through the ringer, but I am emerging on the other side so much stronger," Robach wrote. Stephen Colbert gets Abrams-esque on J.J. Abrams 'How I Met Your Mother' creators tease upcoming moments, talk spinoff