Axillary clearance

What the operation does

An axillary clearance — also known as axillary lymph node dissection (ALND) or axillary node clearance — removes the lymph nodes from the armpit on the side of the breast cancer. It is performed either at the same time as the breast operation or as a separate procedure, depending on when nodal involvement is identified.

The aim is twofold: to treat known cancer in the lymph nodes, and to give a complete picture of how many nodes are involved, which guides decisions about radiotherapy, chemotherapy, and other adjuvant treatment.

Axillary clearance is a more involved operation than sentinel lymph node biopsy, and it carries a higher risk of long-term arm and shoulder symptoms, particularly lymphoedema. It is therefore reserved for situations where the benefit clearly outweighs the risk.

When axillary clearance is recommended

The decision to do an axillary clearance depends on what is known about the lymph nodes before and during surgery. Modern practice has moved away from clearing every patient’s axilla — sentinel lymph node biopsy is the default for most invasive cancers, and clearance is reserved for situations where it is clinically necessary.

Axillary clearance is usually recommended when:

Imaging or biopsy before surgery has confirmed cancer in the axillary lymph nodes — typically through ultrasound-guided fine-needle aspiration or core biopsy of an abnormal-looking node.
A sentinel lymph node biopsy has shown significant disease — enough cancer in the sentinel nodes that a fuller clearance is preferred over axillary radiotherapy (the exact threshold is set by the MDT; micrometastases alone do not usually need clearance; one or two nodes with macrometastases may be treated with axillary radiotherapy instead; three or more positive nodes or extranodal spread more often leads to clearance).
There is recurrent cancer in the axilla after previous breast surgery and radiotherapy.
The patient has inflammatory breast cancer or other situations where systematic nodal clearance forms part of the standard treatment.

In selected cases — particularly small-volume sentinel-node disease in patients having breast-conserving surgery and radiotherapy — axillary radiotherapy rather than clearance may be offered, with similar disease-control outcomes and a lower risk of lymphoedema. This is decided at the multidisciplinary team (MDT) meeting on a case-by-case basis.

How the operation works

The lymph nodes are arranged in three “levels” in the armpit, defined by their relationship to a muscle called pectoralis minor:

Level I — below and lateral to pectoralis minor.
Level II — behind pectoralis minor.
Level III — above and medial to pectoralis minor.

A standard axillary clearance removes levels I and II, which usually contains around 10–20 lymph nodes (the number varies between patients). Level III is generally cleared only if there is bulky disease at level II or specific concern about higher-level involvement.

The operation is done through an incision in the armpit, often the same incision used for the breast operation when both are done together. Important nerves and blood vessels in the axilla — the long thoracic nerve (to the muscle that holds the shoulder blade in place), the thoracodorsal nerve (to the latissimus dorsi muscle), and the intercostobrachial nerves (to the skin of the inner upper arm) — are identified and protected where possible, though the intercostobrachial nerves often have to be divided, leaving an area of altered sensation on the inner arm.

What the operation involves

Anaesthetic: general anaesthetic.
Length of operation: axillary clearance alone takes around 60–90 minutes; combined with breast surgery the total operation is longer.
Hospital stay: typically one night, occasionally day-case if the breast operation is also a day-case procedure.
Drain: a small drain is placed in the armpit and usually stays in for about 5 to 10 days. It is removed in clinic once the fluid coming out over 24 hours is small enough (your team will tell you the exact threshold). Some people need it for a little longer.
Combined with breast surgery: axillary clearance is often performed at the same operation as a mastectomy or wide local excision; sometimes it is a separate operation if nodal involvement is identified after the first operation.

Recovery

First week — drain in place, restricted shoulder movement, simple pain relief. Most patients manage at home from day one or two.
Weeks 2–4 — drain usually removed. Shoulder mobilisation exercises start under physiotherapy guidance immediately, to prevent stiffness (“frozen shoulder”). Most people return to driving 2 to 3 weeks after surgery — but only once you can safely perform an emergency stop and have checked with your insurer.
Weeks 4–6 — desk-based work returned to. Continuing physiotherapy.
Three months — most physical activity resumed. Continued attention to shoulder range and arm strength on the operated side.

Following an axillary clearance, you will be referred to a specialist physiotherapist as part of standard care. Early shoulder exercises are important; left untreated, axillary surgery can lead to lasting shoulder stiffness which is harder to address than to prevent.

Lymphoedema — the risk that matters most

The most important long-term consideration after axillary clearance is lymphoedema — chronic swelling of the arm caused by impaired drainage of lymph fluid after the lymph nodes have been removed. With modern, more selective surgery (and where appropriate, axillary radiotherapy as an alternative), the risk has fallen significantly, but it has not disappeared.

Approximate figures:
– Around 1 in 4 (20–25%) of people having a full axillary clearance will develop some degree of arm lymphoedema (AMAROS trial, 10-year follow-up, 2023). If you also have radiotherapy to the armpit or chest wall, that risk rises further.
– Most cases are mild and well managed with early identification, compression sleeves, and specialist lymphoedema therapy.
– Severe, untreatable lymphoedema is now uncommon.

What helps reduce the risk:

Early intervention — any new arm swelling, heaviness, or tightness on the operated side should be reported promptly. Early management is much more effective than late.
Skin care — keeping the skin of the arm intact, treating cuts and scratches promptly, and avoiding situations that risk infection on the operated side.
Exercise — far from being harmful, regular gentle-to-moderate exercise reduces lymphoedema risk and is encouraged. Specific guidance is given by the physiotherapy team.
Where practical, ask for blood pressure cuffs, blood tests and drips to be taken from the other arm. This is a sensible precaution rather than a strict rule — if the operated arm is the only safe option (for example, in an emergency), that is acceptable.

If lymphoedema does develop, referral to a specialist lymphoedema service is arranged through the practice. Early-stage lymphoedema responds well to compression and manual lymphatic drainage; later-stage cases sometimes benefit from surgical options including lymphovenous anastomosis or vascularised lymph node transfer, available at specialist centres.

Other considerations

Numbness or altered feeling in the inner upper arm and armpit is common after axillary clearance, because small nerves (the intercostobrachial nerves) often have to be cut. Sensation usually improves over the first 6 to 12 months, but a small area of numbness often stays permanently.
Cording — a tight, rope-like sensation under the skin of the inner arm — can develop a few weeks after axillary surgery. It is not dangerous and usually responds well to physiotherapy stretching.
Frozen shoulder is a recognised risk after any axillary surgery; early shoulder exercises significantly reduce the chance.
Seroma — a collection of clear fluid in the axillary cavity after the drain is removed — is common in the first few weeks. Most settle without treatment; a few need a small clinic-based aspiration.

Common questions The questions patients ask first

Why am I being offered axillary clearance instead of just a sentinel biopsy?

Because something about your case — usually known cancer in the lymph nodes on imaging or biopsy, or significant disease found on a sentinel biopsy — has indicated that a fuller clearance is the right operation rather than a more limited sampling. The specific reason in your case is explained at consultation.

Will I get lymphoedema?

Maybe — about a quarter of patients develop some degree of lymphoedema over the long term, but most cases are mild and well-managed. Risk is reduced by early intervention if symptoms develop, by regular exercise, and by good skin care. There is no way to predict exactly who will and will not develop it.

Can I lift weights or play sport again after axillary clearance?

Yes. Once the wound is healed and physiotherapy has progressed shoulder range and strength — usually by 8–12 weeks — full physical activity including weights, swimming, and racquet sports is safe and encouraged. Ironically, regular exercise reduces lymphoedema risk rather than causing it.

Why was my axillary clearance done as a separate operation rather than at the same time as the breast surgery?

Sometimes nodal involvement is identified only after the first operation — for example, the sentinel lymph node biopsy showed disease that warranted a full clearance. In that situation, a second operation a few weeks later is the standard approach.

Will having an axillary clearance change whether I need chemotherapy?

The information from the clearance — particularly how many nodes are involved — feeds into decisions about chemotherapy, radiotherapy, and hormone therapy. The clearance does not in itself decide adjuvant treatment, but it gives the oncology team the information they need to advise on it.

How is recovery different from a sentinel lymph node biopsy?

Recovery is longer and there is more shoulder restriction in the first few weeks. Lymphoedema risk is meaningfully higher with clearance than with sentinel biopsy, though it is not inevitable. Sentinel biopsy is a much smaller operation when it is the appropriate one — but when clearance is needed, it is needed.