The court announced last week that there was "no evidence of any remaining disease".
U.S. Supreme Court Justice Ruth Bader Ginsburg speaks after receiving the American Law Institute's Henry J. Friendly Medal in Washington, D.C., on May 14.
At 85, Ginsburg is the high court's eldest sitting justice. She was released from a hospital the next day.
Ginsburg's previous bouts with cancer were so long ago they're unlikely to be related, Giaccone said.
Ginsburg has been treated in the past for colon cancer and pancreatic cancer, and did not miss any argument sessions.
"If she doesn't need anything but the surgery, it is a very good sign", Lazar said.
Arberg said in a statement Friday that no other growths were found in scans before the procedure and that no additional treatment was planned. She was hospitalized after a bad reaction to medicine in 2009.
Ginsburg, who was appointed by president Bill Clinton in 1993, is one of four liberals on the nine-member court. This year she was the subject of an award-winning documentary and a fictionalized biopic starring Felicity Jones.