Robin Roberts returns to 'Good Morning America' 'rested and rarin' to go'

robin-roberts.jpg Robin Roberts returned to "Good Morning America" Monday (Aug. 21) looking radiant and, as she tweeted that morning, "rarin' to go."

The talk-show co-anchor is expected to undergo a bone-marrow transplant within the next month, part of her ongoing battle against the blood disease myelodysplastic syndrome. Her sister, Sally-Ann Roberts, is her donor.

"Thanks for great welcome back this AM," Roberts tweeted after her return to "GMA." "Going right now to tape PSA for #BeTheMatch. Bone marrow donors (like my sis) are saving lives."

Roberts, 51, received the MDS diagnosis -- the result, she says, of her successful treatment for breast cancer -- in June. In preparation for bone-marrow transplant, she has been receiving chemotherapy, even during her recent vacation in Italy.

"Grateful to Italy for renewing my spirit/soul," she tweeted Aug. 18. While in Rome, Roberts was granted access to the Vatican. She posted a picture of herself there, along with the message: "Saying prayer for all who have prayed for me. XO."

Photo/Video credit: ABC