NCIt definition : The removal of a cancer as well as some of the breast tissue around the tumor and
the lining over the chest muscles below the tumor. Usually some of the lymph nodes
under the arm are also taken out. Also called partial mastectomy. (Cancer.gov);
Alternative definition : NCI-GLOSS: The removal of a cancer as well as some of the breast tissue around the
tumor and the lining over the chest muscles below the tumor. Usually some of the lymph
nodes under the arm are also taken out.;