Justice Sandra Day O'Connor kept her pledge to return to work Monday after undergoing breast cancer surgery 10 days ago.

O'Connor, 58, was on the bench Monday as the court issued orders on pending cases and heard oral arguments.She underwent breast cancer surgery Oct. 21 at Georgetown University Hospital but refused to release details of the operation. The Los Angeles Times, however, reported she had a mastectomy. She has refused to comment on the report.