This happened to me a few years ago. They found a small area of "atypical hyperplasia", which can become DCIS over time. They did a surgical biopsy to remove it. It all went fine and has been fine since then. That may be the "excisional biopsy" they're talking about here?
"My predominant feeling is one of gratitude. I have loved and been loved;I have been given much and I have given something in return...Above all, I have been a sentient being, a thinking animal, on this beautiful planet, and that in itself has been an enormous privilege and an adventure." O. Sacks