Doctors found cancerous cells in Cardinal Francis George's kidney and liver.
According to a Friday news release from the Archdiocese of Chicago, Cardinal George underwent a procedure on Wednesday at Loyola University Medical Center which revealed the cancerous cells in the kidney and in a nodule that was removed from his liver.
A course of treatment has yet to be determined for the 75-year-old Catholic leader.
The Cardinal is resting at home this weekend and will be on a retreat next week, according to the Archdiocese.
Cardinal George underwent a complete medical checkup at the Mayo Clinic earlier this year and a spokesman said at the time that “he’s delighted with a good report.”
Five years ago, he underwent bladder cancer surgery.
The Cardinal submitted a letter of resignation to Pope Benedict XV this year, a formality when Catholic bishops turn 75, but it wasn't accepted. He is expected to remain the head of the Chicago Archdiocese for two or three years.