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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 surgery to remove a breast or part of a breast. It is usually done to treat breast cancer. Which surgery you have depends on the stage of cancer, size of the tumor, size of the breast, and whether the lymph nodes are involved. Many women have breast reconstruction to rebuild the breast after a mastectomy.