Can someone Please explain my report in simple terms.

This report is telling you the results of your re-excision. This means that you had a lumpectomy, but the piece of tissue at the first operation had tumor cells at or near the edge of the chunk of tissue removed. It helps to think of what was removed as a cube of tissue like a rubic's cube.

A second surgery was done to remove additional tissue to make sure that they didn't leave any cancer cells behind. A little "pancake" of tissue is taken from the areas that would have been next to the close, or positive margins(surfaces) from the first surgery. So from the first surgery there would have been cancer cells at or very near the surface of the rubic's cube that they took out the first time on three sides.

Anterior margin means the side of the rubic's cube facing forward toward your skin/nipple. The superior margin is the side of the Rubic's cube facing up towards the sky (when you are sitting or standing up). The medial margin is the side of the Rubic's cube closest to your left breast.

When the surgeon went back for the second operation, there was now a hole where the Rubic's cube had been. Imagine a Hostess cupcake, the part removed was the cream filling, and now there is just empty space there, but there was still a little filling left on some parts of the "hole". By taking a bit more tissue from the three sides, they made sure all the cream filling was gone.

your anterior margin pancake showed a small area of DCIS in the pancake, but there wasn't any at the "new" margin, meaning all the tumor cells should be gone. The other two "pancakes" of tissue did not show any cancer cells.

All the other stuff about fibrosis, fat necrosis, multinucleated giant cells are the changes that happen with healing and what you would find in any tissue that had been operated on, let to heal for a little while, and then had more tissue taken out.

You should be done with surgery, although I am not completely up to date on the current recommendations, as in the past, with DCIS the goal was to have 1 cm of normal tissue between the cancer cells and the outer edge of what was removed.

I hope that helps.