Surgery for breast cancer consists of two main options. In breast-conserving surgery, only the tumor and an area of normal tissue surrounding it are removed. Breast-conserving surgery includes the following: Lumpectomy: A small amount of surrounding normal tissue is removed. Wide excision (partial mastectomy): A somewhat larger amount of the surrounding normal tissue is removed. Quadrantectomy: One fourth of the breast is removed. In mastectomy, all breast tissue is removed. But there several types. Which other tissues (skin, lymph nodes, muscle) and how much of them are removed vary by type.