Breast-conserving surgery (BCS) is sometimes called a lumpectomy or a partial mastectomy. It may be done as part of a treatment plan for breast cancer. With BCS, only the part of the breast that has cancer is removed.
Lumpectomy is surgery to remove cancer. It's a breast-conserving surgery, which means your breast remains intact. If you're having a lumpectomy, you'll probably also have radiation therapy.