sentinel lymph node biopsy
also called SLNB. A procedure that is used instead of routine lymph node dissection (removal) for some cancer types to look for cancer spread to nearby lymph nodes. Blue dye and/or a radioisotope is injected into or near the tumor during surgery, and the first (sentinel) node that picks up the dye is removed and examined. If the node does not contain cancer, other nodes probably do not need to be removed. See also biopsy, lymph node, lymph node dissection, radioisotope.