Ask your surgeon how much breast tissue will be removed. This is important because if a large amount of tissue needs to be removed and would leave an obvious divot, you'll want to talk with your surgeon about how they will keep your breast looking great. Some options are having a plastic surgery consultation for potential fat grafting or another procedure.
We find that breasts generally look excellent after a lumpectomy because most of the breast tissue is left intact. It is also possible to fill in the deficit left by the lump with surrounding tissue so that the shape remains the same.