Which breast nodule is not malignant?

Hello! more or less three years ago, my mother underwent a surgery to remove a nodule in the left breast of approximately 11cm, the biopsy gave negative to Maligno.Ahora I identified another nodule in the same well-enlarged left breast. My question is this: What is the probability of not being Evil? Once it turned negative.
Expert answer:

This probability in numbers is very difficult to say, but benign tumors are much more common than malignant tumors. The chances of being benign are several times greater than the chances of being malignant.

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