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Segmentectomy is the excision (removal) of a portion of any organ or gland. The procedure has several variations and many names, including segmental resection, wide excision, lumpectomy, tumorectomy, quadrantectomy, and partial mastectomy.
A mastectomy is a surgical procedure in which all or a portion of a breast is removed as a part of treatment for breast cancer. In some cases, mastectomy is performed prophylactically (to prevent cancer from occurring) in women with a high risk for developing breast cancer.