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Ruth Bader Ginsburg at home

From NBC's Pete Williams

Supreme Court Justice Ruth Bader Ginsburg has been released from a New York hospital and is recovering from surgery at her home in Washington, a Supreme Court official says.

But the court today revealed a remarkable discovery made by her doctors when they performed surgery for pancreatic cancer.

The surgery followed the discovery of a tumor, which showed up on a CAT scan of Justice Ginsburg, part of a routine medical checkup in late January.

According to her doctors, during the surgery to remove that tumor, which turned out to be benign, they discovered a previously undetected and even smaller tumor.

It was that smaller tumor, one they did not know existed, that turned out to be cancerous.

Her doctors say Justice Ginsburg's lymph nodes showed no sign of cancer, and they do not believe the pancreatic cancer spread.

Nonetheless, her surgeon removed Justice Ginsburg's spleen and part of her pancreas.

The cancerous tumor is described as "TNM Stage 1".

Ginsburg's associates say she remains determined to be at the Supreme Court when the justices return to the bench on Monday, Feb. 23.