Axillary sentinel node biopsy: what to expect

A tracer is used to identify the sentinel node or nodes, which a surgeon removes through a small incision. A laboratory then examines the tissue. The result helps describe whether disease has reached nearby lymph nodes and can influence decisions about further surgery or other treatment.

Sentinel nodes are the lymph nodes most likely to receive drainage from the breast area being assessed. Removing selected nodes can provide staging information without automatically removing many underarm nodes. A negative result means no cancer was identified in the sampled sentinel tissue; a positive result means cancer cells were found. The report may describe the amount of disease and tests used to examine the sample.

The finding is interpreted alongside the breast diagnosis, imaging, operation details and planned therapy. It does not, by itself, provide every part of a cancer stage or determine a complete treatment plan.

Before the biopsy, tell the care team about medicines, allergies, bleeding problems and any previous underarm surgery. Follow their instructions about eating, drinking and medicines on the procedure day. Ask where the tracer will be given and whether the node biopsy will occur during breast surgery.

Afterward, keep the wound clean as instructed and limit arm activity for the period your surgical team recommends. Mild bruising, soreness or altered sensation can occur. Attend the result appointment because the pathology wording needs to be considered with the rest of your clinical information.

Seek prompt medical advice for increasing redness, warmth, swelling, wound discharge, fever, worsening pain, new marked arm swelling or bleeding that does not settle with gentle pressure. Get urgent help for trouble breathing, chest pain, fainting or signs of a severe allergic reaction. For non-urgent concerns such as persistent numbness or reduced shoulder movement, contact the surgical team for assessment and recovery guidance.

Ask how the sentinel nodes will be located, whether the procedure is combined with another operation, what wound care you will need, and when results should be available. You may also ask what a positive or negative result would change, whether additional underarm treatment could be considered, and whom to contact if symptoms develop at home.