mastectomyListen to pronunciation(ma-STEK-toh-mee)Surgery to remove part or all of the breast. There are different types of mastectomy that differ in the amount of tissue and lymph nodes removed.More InformationBreast Cancer TreatmentEnlarge this image in new windowTotal (simple) mastectomy. The whole breast is removed. Some of the lymph nodes under the arm may also be removed.Search NCI's Dictionary of Cancer TermsStarts withContainsBrowse:ABCDEFGHIJKLMNOPQRSTUVWXYZ#