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NCI Dictionary of Cancer Terms

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partial mastectomy  listen  (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.

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