NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,790 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; the drawing on the left shows removal of the tumor. The drawing on the right shows removal of the tumor and some of the lymph nodes under the arm. Also shown, is an inset with a cross-section of the breast, including the chest wall lining, fatty tissue, and the tumor.

Breast-conserving surgery. The tumor and some normal tissue around it are removed, but not the breast itself. Some of the lymph nodes under the arm may also be removed.