NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,777 terms related to cancer and medicine.

Browse the dictionary by selecting a letter of the alphabet or by entering a cancer-related word or phrase in the search box.

segmental mastectomy
(seg-MEN-tul 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 partial mastectomy.

EnlargeBreast-conserving surgery; drawing shows removal of the tumor and axillary lymph nodes.

Breast-conserving surgery. Dotted lines show the area containing the tumor that is removed and some of the lymph nodes that may be removed.