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Lymph Nodes in Endometrial Cancer
Lymph nodes come up at two moments — before surgery, when you are told they will be checked, and afterwards, when the report says something about them. The single most useful thing to understand is why they are assessed at all: nodes are checked to find out whether the cancer has spread, not because removing them treats anything. That distinction sounds academic and it drove a major change in practice. Once trials showed that removing large numbers of nodes did not improve survival while causing considerable long-term harm, surgery moved to removing very few — the ones that actually answer the question. This page explains that, and what a positive node result means.
- Nodes are assessed to stage — not because removal treats the cancer
- Fewer nodes is better practice — not a less thorough operation
- Positive nodes mean stage III — still treated with curative intent
- Lymphoedema is the trade-off — and it is why the change happened
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How Nodes Are Assessed
Which approach is used depends on your tumour type, grade and apparent stage.
| Approach | What it involves |
|---|---|
| Sentinel node mapping | Tracer injected into the cervix travels to the first nodes draining the uterus. Those few are removed and examined in fine detail — a process called ultrastaging that finds small deposits a routine examination would miss. Now the standard approach for most endometrial cancers. See sentinel node biopsy. |
| Systematic lymphadenectomy | Removal of all the nodes in defined pelvic and sometimes para-aortic areas. Still used in specific circumstances — where mapping fails on one side, or in some high-risk histologies — but no longer the default, because of the lymphoedema risk it carries. |
| Removing only enlarged nodes | Where imaging or the surgeon identifies visibly abnormal nodes, those are removed regardless of mapping. This is about dealing with evident disease rather than about staging. |
| No node assessment at all | Reasonable in some very low-risk situations, and a decision made deliberately rather than by omission. If nodes were not assessed, ask why — there should be a stated reason. |
| Imaging alone | MRI, CT and PET-CT can suggest node involvement but cannot exclude small deposits. A clear scan is reassuring rather than definitive, which is why surgical assessment retains a role. See PET-CT. |
If your report says “0/3 nodes”, that is not a smaller operation than “0/28”. It is a better one. Three sentinel nodes examined in fine detail give staging information equivalent to twenty-eight examined routinely, with a fraction of the lymphoedema risk. Women sometimes worry the surgeon did not do enough; the opposite is true.
Did You Know? For years the standard operation for endometrial cancer removed large numbers of pelvic lymph nodes, on the reasonable assumption that taking out more disease must be better. Randomised trials tested that assumption and did not support it: removing many nodes gave better staging information but did not by itself improve survival, while substantially increasing the risk of permanent leg lymphoedema. Sentinel node mapping resolved the tension. Tracer is injected into the cervix and travels to the first nodes draining the uterus — the ones disease would reach first. Those few nodes are removed and examined in far greater detail than would be practical for thirty. The staging information is equivalent; the long-term harm is much less. Sources: NCCN Clinical Practice Guidelines in Oncology — Uterine Neoplasms; ESGO–ESTRO–ESP guidelines for the management of patients with endometrial carcinoma; FIRES and ASTEC study data on lymph node assessment in endometrial cancer.
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If Your Nodes Are Positive
A difficult line to read on a report. What it means, precisely.
- It means stage III. Cancer cells were found in one or more lymph nodes, which indicates disease has spread beyond the uterus by lymphatic routes. That is the definition of stage III. See stage 3 endometrial cancer.
- Stage III is treated with curative intent. This matters and is frequently not said clearly enough. Node-positive endometrial cancer is treated to cure, using systemic therapy usually combined with radiotherapy. It is not palliative treatment.
- The detail within “positive” matters. Whether one node or several; whether pelvic only or extending to the para-aortic nodes; whether deposits are microscopic or macroscopic. These distinctions influence both treatment and outlook, so ask for them rather than accepting the headline.
- Systemic treatment becomes central. Because disease has demonstrably travelled, treatment that reaches the whole body becomes the priority, generally with radiotherapy for local control. See chemotherapy.
- Molecular class still applies. Mismatch repair status in particular determines which classes of systemic treatment are available and has changed what can be offered in node-positive and advanced disease. See molecular classification.
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Three Nodes Is Not Less Than Thirty
Sentinel nodes are examined in far greater detail — same information, far less long-term harm.
The Trade-Off: Leg Lymphoedema
The reason node surgery changed. Worth understanding whichever approach you had.
What it is
Persistent swelling of one or both legs caused by disruption of lymphatic drainage when nodes are removed. It causes heaviness, aching, difficulty with footwear and clothing, and susceptibility to skin infections. It is the principal long-term complication of endometrial cancer surgery and it is frequently under-discussed beforehand. See leg lymphoedema.
Why fewer nodes means less risk
Risk rises with the number of nodes removed. Sentinel mapping typically removes a handful rather than dozens, and the reduction in lymphoedema is substantial. This is the single strongest practical argument for having surgery at a centre that offers mapping.
It can appear months or years later
Not only in the weeks after surgery. Swelling that develops a year or two afterwards is still likely to be related, and it is worth reporting rather than accepting. Early treatment works considerably better than late treatment.
It is manageable but not curable
Compression garments, specialist lymphoedema therapy and careful skin care control it well for most women. Once established it does not resolve entirely, which is precisely why avoiding it matters more than treating it.
Report any leg infection promptly
Cellulitis in a limb with lymphoedema needs prompt antibiotic treatment, because each episode worsens the underlying swelling. A red, hot, painful leg is not something to watch for a few days.
Told Your Nodes Are Involved?
Bring your reports. What was found, what it changes, and what the options are. The opinion is free.
Questions Worth Asking
Before surgery, and after the report comes back.
- Before: “Will sentinel node mapping be used?” If not, ask why. There are legitimate reasons — certain histologies, or a unit that does not offer it — and the second is worth knowing before you choose where to have surgery.
- Before: “What happens if mapping fails on one side?” A recognised situation with an agreed answer, usually removal of the nodes on that side only. Knowing the plan in advance makes the report easier to read.
- After: “How many nodes, and how many involved?” The fraction on the report. Ask what it means rather than inferring — women frequently misread which number is which.
- After: “Were the deposits microscopic or macroscopic?” A meaningful distinction that influences treatment, and one that is rarely volunteered.
- After: “What is the plan, and what is its intent?” With node-positive disease, ask directly whether treatment is being given with curative intent. The answer is usually yes and hearing it said plainly matters. See treatment after surgery.
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Stage III Is Treated to Cure
Node-positive endometrial cancer is treated with curative intent — that is worth hearing said plainly.
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Common questions
Lymph Nodes — Frequently Asked Questions
Why are lymph nodes removed if it does not improve survival?
Because they answer a question that changes your treatment. Node status establishes whether disease has spread beyond the uterus, which determines the stage and therefore whether you need systemic therapy and radiotherapy after surgery. What randomised trials showed is that removing large numbers of nodes does not by itself confer a survival benefit, while substantially increasing the risk of permanent leg lymphoedema. That finding did not make node assessment pointless; it made removing dozens of nodes unjustifiable. Sentinel mapping removes the few nodes that actually answer the staging question, with far less harm.
My report says 0/3 nodes. Did the surgeon not remove enough?
No — that is very likely a sentinel node procedure and it represents better surgery rather than less. Sentinel mapping identifies the first nodes draining the uterus, which are the ones disease would reach first, and those few nodes are then examined in far greater detail than would be practical for thirty. The process, called ultrastaging, detects small deposits that a routine examination of many nodes would miss. The staging information is equivalent to systematic removal, and the risk of permanent leg lymphoedema is substantially lower.
What does it mean if my lymph nodes are positive?
It means cancer cells were found in one or more nodes, indicating the disease has spread beyond the uterus by lymphatic routes. That defines stage III. The most important thing to be clear about is that stage III endometrial cancer is treated with curative intent — systemic therapy, usually combined with radiotherapy — and this is not palliative treatment. Ask for the detail behind the word: how many nodes were involved, whether involvement was confined to the pelvis or extended to the para-aortic nodes, and whether the deposits were microscopic or macroscopic. Each of those influences treatment and outlook.
Will I definitely get lymphoedema?
No. Risk relates strongly to how many nodes were removed, which is precisely why sentinel mapping matters. With a sentinel node procedure the risk is substantially lower than after systematic removal of many pelvic nodes, and many women never develop it. Where it does occur it may appear soon after surgery or months to years later, so persistent leg swelling should be reported whenever it starts rather than assumed to be unrelated. Early treatment with compression and specialist lymphoedema therapy works considerably better than late treatment, and any red, hot, painful leg needs prompt antibiotic assessment.
Can a scan tell whether my nodes are involved?
It can suggest it but cannot settle it. MRI, CT and PET-CT identify nodes that are enlarged or metabolically active, which raises suspicion — but none of them reliably detects small deposits, and a clear scan is reassuring rather than definitive. This is precisely why surgical assessment retains a role: the pathologist examining the removed nodes provides the definitive answer, and with sentinel node ultrastaging the examination is detailed enough to find deposits that imaging could never have shown. Your final stage rests on the pathology, not on the scan.
Medical disclaimer: This page provides general information about lymph node assessment in endometrial cancer, reviewed by a CION oncologist. It is not a substitute for individual medical advice. Which approach to node assessment is appropriate depends on tumour type, grade and apparent stage, and should be decided with your surgical team. Persistent leg swelling after surgery should be reported to your treating team whenever it develops.