DCIS and sentinel node biopsy

It is also commonly discussed when mastectomy is planned because checking sentinel nodes later may no longer be practical.

Sentinel nodes are the first underarm lymph nodes likely to receive drainage from the breast. During surgery, the surgeon uses a tracer to locate them, removes a small number and sends them for microscopic examination. The procedure looks for cancer cells outside the breast; it does not remove the DCIS itself.

Pure DCIS is contained within milk ducts and therefore does not have access to lymphatic channels in surrounding tissue. The question arises because a core biopsy samples only part of an abnormal area, and the larger surgical specimen can occasionally reveal an invasive focus that was not present in the sample.

Before surgery, ask whether the imaging, examination or biopsy raises concern for invasion and whether your operation would make a later sentinel node procedure difficult. Mastectomy is an important setting for this discussion. With lumpectomy for DCIS, the team may be able to wait for final pathology before considering lymph-node surgery.

Balance the staging value against possible effects such as underarm discomfort, reduced sensation, limited shoulder movement, fluid collection and lymphoedema. Follow the surgical team's instructions about wound care and arm movement, and attend the visit where the breast and node pathology are explained together.

Contact the surgical unit promptly for fever, spreading redness, pus-like drainage, worsening underarm swelling, uncontrolled pain or a wound that opens. New persistent arm or hand swelling, heaviness, tightness or reduced movement should also be assessed. Seek urgent care for breathing difficulty, chest pain or a severe allergic reaction.

Ask why sentinel node biopsy is or is not recommended in your case, whether it will occur during the same anaesthetic as breast surgery, and what would change if a node contains abnormal cells. Clarify how many nodes the surgeon expects to remove, how side effects are managed and when final results will be available.