Jimmy Carter undergoes liver surgery

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NEW YORK, NY - MARCH 25: Former US President Jimmy Carter poses for a photo as he promotes his new book "A Call To Action Women, Religion, Violence, And Power" at Barnes & Noble, 5th Avenue on March 25, 2014 in New York City. (Photo by Jemal Countess/Getty Images)

WASHINGTON (CNN) — Former President Jimmy Carter had a “small mass” removed from his liver during surgery Monday, his office said.

The surgery at Emory University Hospital “proceeded without issues, and the prognosis is excellent for a full recovery,” according to a statement from the Carter Center, the Atlanta not-for-profit the former president opened after leaving the White House.

Carter, 90, is the second-oldest living president but has led an active post-presidency, recently releasing a new autobiography, “A Full Life,” and promoting it in media appearances.

The former President has experienced some health concerns before. He cut a trip short to Guyana in May because he “was not feeling well.”