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Lymph nodes serve as a filtering system for the lymphatic system (a system of vessels that collects fluids from cells for filtration and reentry into the blood). The first node in the armpit area (axillae) that is affected by breast cancer is also called the sentinel, or guard node. Learn more about sentinel lymph node biopsy.
If the cancer is found to have spread to this specific lymph node or other nodes in the axillary area, then your breast surgeon will probably recommend an axillary node dissection. Each woman has a different number of nodes in her body, so the decision to remove nodes is not based on number, but on location.
There are three levels of axillary lymph nodes and options for dissection:
In most cases, level I or II nodes need to be surgically removed if the sentinel node is found to be positive or if it is known prior to surgery (via fine needle aspiration biopsy) that there is an enlarged node with cancer in the armpit area.