partial mastectomy(PAR-shul ma-STEK-toh-mee)
Surgery to remove the part of the breast that has cancer and some of the normal tissue around it. The lining over the chest muscles below the cancer and some of the lymph nodes under the arm may also be removed. It is a type of breast-conserving surgery. Also called segmental mastectomy.
Breast-conserving surgery. Dotted lines show the area containing the tumor that is removed and some of the lymph nodes that may be removed.