The 1-centimeter growth that doctors initially spotted during a CT scan in late January turned out, upon analysis, to be benign. But a second, even smaller tumor found by her surgeon, Dr. Murray Brennan, during the operation was malignant, the court said. Doctors classified the cancer as early stage, or Stage 1.
Tests on Ginsburg's lymph nodes revealed no cancer and doctors found no spread of it elsewhere, the court said.
Brennan removed Ginsburg's spleen and a portion of the pancreas on Feb. 5.
Ginsburg has indicated she will be at the court when the justices next hear arguments on Feb. 23.
Ginsburg had been scheduled to give a speech Friday on the role of women in reshaping American law at the Rutgers School of Law in Newark, N.J., where she once taught. She had a friend deliver the talk in her place, but added a brief message explaining her absence. "My ability to convey what is on my mind and in my heart has been temporarily tossed off course," she said, in remarks released by the court.
Cancer specialists said that it is possible Ginsburg may avoid chemotherapy because of the small size of the tumor and the absence of cancer in her lymph nodes.
"Many would elect not to do anything further here," said Dr. Suresh Chari, a gastroenterologist at the Mayo Clinic in Rochester, Minn.
The course of her illness so far strongly suggests the benefits of early detection, even though in this case it was incidental. Ginsburg had been suffering no symptoms and was undergoing a routine physical when doctors spotted a growth on her pancreas.
As a survivor of colon cancer, Ginsburg would be expected to have regular checkups that look for growths in that part of the body. Doctors removed a cancerous growth from her colon in 1999 and she underwent chemotherapy and radiation, without missing a day on the bench.