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If you have invasive breast cancer, your surgeon will probably remove some of the lymph nodes under your arm during your lumpectomy or mastectomy. Examining your lymph nodes helps your doctors figure out the extent of cancer involvement. Cancer in the lymph nodes is associated with an increased risk of having cancer cells in other parts of your body.


Your lymph nodes act as filters for your body’s lymphatic drainage system. That’s why the lymph nodes are likely to “catch” or filter out cancer cells that might be floating in the fluid that drains away from the cancerous area of the breast. Doctors look at the different kinds of nodes that are involved with your breast:


The nodes around your collarbone and neck (supraclavicular, infraclavicular, and cervical nodes) are examined manually (by hand). Your doctor will feel this area for signs of enlarged nodes.


The nodes under your arm (axillary lymph nodes) are also examined manually and are relatively easy to get to during surgery. Surgeries to remove some or all of the lymph nodes under your arm are called sentinel lymph node dissection or axillary lymph node dissection.


In this section:


What Are Lymph and Lymph Nodes?

Why Are Lymph Nodes Important?


How Many Lymph Nodes Are Removed?

Axillary Lymph Node Dissection

Lymph Node Dissection: What to Expect

Risk of Lymphedema

Sentinel Lymph Node Dissection


American Hospital, Koç University Hospital


Prof. Dr. Abdulmuttalip Şimşek, Prof. Dr. Burak Koçak, Prof. Dr. Derya Balbay, Prof. Dr. Tarık Esen


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