App Store
Google Play
Axillary lymph nodes are small, bean-shaped immune structures found in your armpit area. They filter lymph fluid from your breast, chest wall, upper abdomen, shoulder, arm, and upper back. They also help your body respond to infections, inflammation, and abnormal cells.
In cancer care, axillary lymph nodes are important because cancer cells can sometimes travel through the lymphatic system. In breast cancer, axillary lymph nodes are often among the first nearby lymph nodes doctors assess. Their status can help guide diagnosis, staging, treatment planning, and follow-up care.
Finding a swollen lymph node does not always mean cancer. Infections, recent vaccination, skin inflammation, autoimmune diseases, leukaemia, lymphoma, and other conditions can also affect lymph nodes. A doctor can help identify the cause through examination, imaging, and tests.
What Are Axillary Lymph Nodes?
Axillary lymph nodes are lymph nodes located in the axilla, which is the medical term for the armpit. Most people have several axillary lymph nodes on each side. These nodes act like filters. They trap germs, damaged cells, and sometimes cancer cells.
Axillary lymph nodes are part of the lymphatic system. This system carries lymph fluid through lymph vessels and helps maintain fluid balance. It also supports your immune system.
When axillary lymph nodes become enlarged, tender, firm, or fixed, your doctor may advise further evaluation. The cause may be simple, such as an infection, or more serious, such as metastatic disease. This is why medical assessment is important when swelling persists or is associated with other symptoms.
Anatomy Of Axillary Lymph Nodes
The anatomy of axillary lymph nodes helps doctors understand where lymph fluid drains and how cancer may spread. These nodes receive lymph from the breast, arm, chest wall, and nearby skin.
In breast cancer, lymph drainage from the breast often reaches the axillary lymph nodes. This makes axillary lymph nodes in breast cancer especially important for diagnosis and staging.
Doctors may describe the axillary lymph nodes groups by their location and drainage pattern. They may also describe axillary lymph nodes levels based on their relationship to the pectoralis minor muscle. These anatomical details help surgeons and oncologists plan treatment with greater precision.
Role Of Axillary Lymph Nodes In Cancer
Axillary lymph nodes play an important role in cancer diagnosis because they can show whether cancer cells have moved beyond the original tumour. This is especially relevant in breast cancer and melanoma. It may also be considered in some other cancers depending on the site and spread pattern.
When cancer cells are found in axillary lymph nodes, doctors use this information along with tumour size, tumour biology, imaging, biopsy results, and other test findings. This helps them decide whether you may need surgery, radiation therapy, chemotherapy, hormone therapy, targeted therapy, immunotherapy, or a combination of treatments.
The presence or absence of cancer in axillary lymph nodes can also help doctors estimate prognosis. However, lymph node status is only one part of the full picture. Many people with lymph node involvement still respond well to treatment, especially when diagnosis and care are timely.
Axillary Lymph Nodes And Breast Cancer
Axillary lymph nodes in breast cancer are checked because breast cancer cells may travel first to nearby lymph nodes in the armpit. If these nodes are free of cancer, it may suggest that the disease has not spread to nearby lymph nodes. If cancer cells are present, doctors use that information to plan the next steps.
Your doctor may examine the armpit during a clinical breast examination. If a lump or suspicious change is found, imaging may be advised. Axillary Ultrasound is commonly used to look at the size, shape, cortex, and fatty hilum of lymph nodes. Suspicious nodes may need a fine needle aspiration or core needle biopsy.
It is important to remember that not every enlarged lymph node is cancerous. Axillary lymph nodes may enlarge due to infections, vaccine response, inflammatory conditions, autoimmune diseases, or blood-related conditions such as leukaemia or lymphoma. A proper diagnosis avoids unnecessary worry and supports timely care.
Levels Of Axillary Lymph Nodes
Doctors often classify axillary lymph nodes levels into three levels:
- Level I: These axillary lymph nodes are located below and lateral to the pectoralis minor muscle. They are usually the first area assessed in many breast cancer cases.
- Level II: These axillary lymph nodes are located behind the pectoralis minor muscle. They may be involved if disease has moved beyond Level I nodes.
- Level III: These axillary lymph nodes are located above and medial to the pectoralis minor muscle. Involvement of these nodes may suggest more advanced regional spread.
Axillary lymph nodes levels help doctors understand the extent of nodal involvement. They also help guide surgery and radiation therapy planning.
Axillary Lymph Node Groups
The main axillary lymph nodes groups include:
- Anterior or pectoral group: These nodes receive lymph from the front chest wall and much of the breast.
- Posterior or subscapular group: These nodes receive lymph from the upper back and shoulder region.
- Lateral or humeral group: These nodes receive lymph from most of the arm.
- Central group: These nodes receive lymph from the anterior, posterior, and lateral groups.
- Apical group: These nodes receive lymph from other axillary lymph nodes groups and drain towards deeper lymphatic channels.
Understanding axillary lymph nodes groups helps doctors track lymph flow and assess possible routes of cancer spread.
How Axillary Lymph Nodes Affect Cancer Treatment
Axillary lymph nodes affect cancer treatment because they help show whether treatment should stay focused on the original tumour or include wider regional and systemic care.
If axillary lymph nodes are not involved, treatment may be less extensive in selected cases. If axillary lymph nodes contain cancer cells, your doctor may consider additional treatment to reduce the risk of recurrence and manage possible spread.
Treatment may include sentinel lymph node biopsy, axillary lymph node dissection, radiation therapy, chemotherapy, hormone therapy, targeted therapy, or immunotherapy. The final plan depends on the type of cancer, stage, tumour markers, general health, and treatment goals.
Complications From Axillary Lymph Node Removal
Axillary lymph node removal can be helpful in diagnosis and treatment, but it may have side effects. These may include pain, swelling, numbness, reduced shoulder movement, infection, seroma, and lymphedema.
Lymphedema is swelling caused by a build-up of lymph fluid. It may affect the arm, hand, breast, or chest wall. The risk is usually lower after sentinel lymph node biopsy than after axillary lymph node dissection, because fewer nodes are removed.
Early physiotherapy, arm exercises, skin care, and regular follow-up can help reduce complications. You should tell your doctor if you notice increasing swelling, tightness, redness, heaviness, fever, or reduced arm movement after surgery.
What Tests Should Be Done Before And After Axillary Lymph Node Treatment?
Before treatment, doctors may advise tests to understand the cancer type, stage, and lymph node status. These tests may include clinical examination, mammography, breast ultrasound, Axillary Ultrasound, MRI, biopsy, blood tests, receptor testing, and imaging for metastatic disease when required.
After treatment, follow-up tests depend on your diagnosis and treatment plan. Your doctor may monitor healing, arm movement, swelling, blood counts, organ function, tumour markers in selected cases, and imaging findings when clinically needed.
At Metropolis Healthcare, diagnostic testing can support different stages of health monitoring. With a wide network, 4,000 plus tests, speciality testing, home sample collection, and reliable reports, Metropolis Healthcare helps you stay informed about important health markers during routine checkups, treatment follow-up, and preventive healthcare.
Axillary Lymph Node Biopsy And Dissection
Axillary lymph node biopsy is used to check whether lymph nodes contain cancer cells. A doctor may recommend fine needle aspiration, core needle biopsy, or sentinel lymph node biopsy depending on the case.
In sentinel lymph node biopsy, a tracer dye or radioactive substance helps identify the first lymph node or nodes that drain fluid from the tumour area. These nodes are removed and examined by a pathologist. If they are free of cancer, more extensive lymph node removal may not be needed in many cases.
Axillary lymph node dissection is a surgery in which more axillary lymph nodes are removed. It may be advised when cancer has clearly spread to lymph nodes, when sentinel node results show significant disease, or when the treatment team believes it is needed for local control. The decision is individual and should be discussed with your oncology team.
Lymph Node Involvement And Cancer Staging
Lymph node involvement is a key part of cancer staging. In breast cancer, doctors use the TNM system. T refers to tumour size and extent. N refers to lymph node involvement. M refers to metastatic disease, which means cancer has spread to distant parts of the body.
If axillary lymph nodes are negative, this may suggest lower regional spread. If axillary lymph nodes are positive, doctors assess the number of affected nodes, their location, and whether cancer cells are small deposits or larger areas.
This information helps classify the cancer stage and plan treatment. It also helps your doctor explain your expected course of care in a clear and practical way.
Tests Before And After Cancer Treatment
Common tests before and after axillary lymph node treatment may include:
- Clinical examination of the breast, chest wall, armpit, and arm
- Mammography or breast ultrasound
- Axillary Ultrasound to assess lymph node features
- Fine needle aspiration or core needle biopsy when nodes look suspicious
- Sentinel lymph node biopsy for selected cancers
- Histopathology to confirm whether cancer cells are present
- Immunohistochemistry and receptor testing in breast cancer
- Complete blood count and other blood tests before chemotherapy or surgery
- Liver and kidney function tests when medicines or systemic therapy are planned
- Imaging tests to assess metastatic disease when clinically required
- Follow-up assessment for lymphedema, shoulder stiffness, pain, or wound healing
Your doctor will choose tests based on your cancer type, stage, treatment plan, and recovery.
Post-Surgical Monitoring Of Axillary Lymph Nodes
After surgery, monitoring focuses on healing, arm movement, swelling, and any signs of recurrence. Your care team may check the surgical wound, shoulder range of motion, and symptoms such as pain, numbness, heaviness, or swelling.
You may be advised gentle exercises after surgery. These exercises can help restore movement and reduce stiffness. Avoid starting strenuous activity without medical advice.
If you notice a new lump, persistent swelling, unexplained pain, fever, redness, or discharge from the wound, speak to your doctor. Early support can help manage problems before they worsen.
Conclusion
Axillary lymph nodes are important in cancer diagnosis and treatment, especially in breast cancer. They help doctors understand whether cancer has spread, how advanced it may be, and which treatment plan may suit you best.
If you are undergoing evaluation or treatment, try not to assume the worst from a swollen lymph node. Many causes are non-cancerous. The right tests and expert interpretation can provide clarity.
Metropolis Healthcare can support your health journey with accurate diagnostic testing, full body checkups, speciality tests, quick turnaround time, and convenient home sample collection. You can book tests through the website, app, call, or WhatsApp. With a strong home collection network and 10,000 touchpoints, Metropolis Healthcare makes preventive health screening and ongoing wellness monitoring easier and more accessible.
FAQs
What Is The Role Of Axillary Lymph Nodes In Cancer Treatment?
Axillary lymph nodes help doctors understand whether cancer has spread from the original tumour to nearby lymph nodes. This information can guide surgery, radiation therapy, chemotherapy, targeted therapy, and follow-up care.
How Are Axillary Lymph Nodes Examined In Breast Cancer?
Doctors may examine axillary lymph nodes through physical examination, Axillary Ultrasound, mammography, MRI, biopsy, sentinel lymph node biopsy, or axillary lymph node dissection. The choice depends on your symptoms, imaging findings, and cancer stage.
Can Axillary Lymph Node Removal Cause Lymphedema?
Yes, axillary lymph node removal can cause lymphedema in some people. The risk is usually higher when more lymph nodes are removed. Early care, exercises, physiotherapy, and regular follow-up can help reduce and manage the risk.
How Do Doctors Determine Cancer Stage Using Axillary Lymph Nodes?
Doctors check whether axillary lymph nodes contain cancer cells. They also assess how many nodes are involved and where they are located. This information forms the N part of TNM staging and helps guide treatment.
Are There Any Alternatives To Axillary Lymph Node Dissection?
Yes, in selected cases, sentinel lymph node biopsy or radiation therapy may reduce the need for full axillary lymph node dissection. Your doctor will decide based on the cancer type, stage, sentinel node findings, and overall treatment plan.
What Tests Are Done After Lymph Node Dissection?
After lymph node dissection, doctors may advise wound checks, arm and shoulder movement assessment, lymphedema monitoring, blood tests, imaging when needed, and follow-up visits. The exact tests depend on your treatment plan and recovery.
Is It Possible For Axillary Lymph Nodes To Be Free Of Cancer After Removal?
Yes. Sometimes removed axillary lymph nodes show no cancer cells on pathology testing. This can be reassuring and may help your doctor avoid more extensive treatment in selected cases.
References
Krag DN, Anderson SJ, Julian TB, Brown AM, Harlow SP, Costantino JP, et al. Sentinel-lymph-node resection compared with conventional axillary-lymph-node dissection in clinically node-negative patients with breast cancer: overall survival findings from the NSABP B-32 randomised phase 3 trial. Lancet Oncol. 2010;11(10):927-933. PMID: 20863759.
- Giuliano AE, Hunt KK, Ballman KV, Beitsch PD, Whitworth PW, Blumencranz PW, et al. Axillary dissection vs no axillary dissection in women with invasive breast cancer and sentinel node metastasis: a randomized clinical trial. JAMA. 2011;305(6):569-575. PMID: 2130408
- Giuliano AE, Ballman KV, McCall L, Beitsch PD, Brennan MB, Kelemen PR, et al. Effect of axillary dissection vs no axillary dissection on 10-year overall survival among women with invasive breast cancer and sentinel node metastasis: the ACOSOG Z0011 randomized clinical trial. JAMA. 2017;318(10):918-926. PMID: 28898379.
- Brackstone M, Baldassarre FG, Perera FE, Cil T, Mac Gregor MC, Dayes IS, et al. Management of the axilla in early-stage breast cancer: Ontario Health (Cancer Care Ontario) and ASCO Guideline. J Clin Oncol. 2021;39(27):3056-3082. PMID: 34279999.
- Marino MA, Avendano D, Zapata P, Riedl CC, Pinker K. Lymph node imaging in patients with primary breast cancer: concurrent diagnostic tools. Oncologist. 2020;25(2):e231-e242. PMID: 32043792.
