partial mastectomy

(PAR-shul ma-STEK-toh-mee)
An operation to remove the cancer and some normal tissue around it, but not the breast itself. Some lymph nodes under the arm may be removed for biopsy. Part of the chest wall lining may also be removed if the cancer is near it. Also called breast-conserving surgery, breast-sparing surgery, lumpectomy, quadrantectomy, and segmental mastectomy.