Medical Oncologist
CION Cancer Clinics
Why testicular cancer spreads to the back of the abdomen | CION Cancer Clinics
Testicular cancer spreads first to the lymph nodes at the back of the abdomen, beside the aorta, because the testicle forms next to the kidney before birth and its lymph channels keep that route for life. This is why your scan looked at the abdomen, why groin glands are rarely involved, and why the operation to remove those nodes, RPLND, is an abdominal one. This page explains the pattern and what it means for treatment. CION Cancer Clinics’ surgical oncologists in Hyderabad can talk this through with you.
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Medically reviewed by Dr. Muralidhar MuddusettyConsultant Surgical Oncologist · MBBS (AIIMS), MS (Surgery, AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh) · last reviewed September 2026, next review due September 2027
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On this page
- Why does testicular cancer spread to the back of the abdomen?
- Where the cancer goes first, and where it goes next
- How your team checks whether the nodes are involved
- Words on the scan report, in plain language
- Does spread to these nodes change what happens next?
- Four things families tell us, and what is actually true
- Common questions about where testicular cancer spreads
The short answer
Why does testicular cancer spread to the back of the abdomen?
Because that is where the testicle's lymph channels drain. Before birth, each testicle forms high in the abdomen, next to the kidney, and then travels down into the scrotum. Its blood vessels and lymph channels stay attached to that starting point. So when cancer cells leave the testicle through the lymph, they travel up that long route and stop first in the lymph nodes (small glands that filter fluid from the tissues) beside the aorta, at the back of the abdomen.
Why not the groin?
The skin of the scrotum drains to the groin nodes, but the testicle inside it does not. This is why a testicular cancer almost never causes swollen groin glands unless the scrotum itself has been cut into or operated on before. It is also why the testicle is removed through a cut in the groin, not through the scrotum: that keeps the drainage pattern predictable.
What this area is called
Doctors call it the retroperitoneum, meaning the space behind the lining of the abdomen. On your scan report you may see the words para-aortic or retroperitoneal nodes. They all describe the same region, in front of the spine and around the main blood vessels.
The route
Where the cancer goes first, and where it goes next
The spread follows a pattern that surgeons know well. That pattern is what makes RPLND possible.
From the left testicle
The left testicular vein joins the left kidney vein, so the first nodes involved sit just below the left kidney vein, beside the aorta. Spread from this side tends to stay on the left at first.
From the right testicle
The right testicular vein joins the vena cava directly, so the first nodes sit between the aorta and the vena cava. Spread from the right crosses over to the left side more readily than the reverse.
This is why the mapped area cleared in a right-sided RPLND is usually a little wider.Upwards to the chest
If the abdominal nodes are bypassed or overwhelmed, the next stop is the nodes in the chest, behind the breastbone, and then the lungs. This is why a chest scan is part of every staging work-up.
Through the blood
Less often, cells travel in the bloodstream rather than the lymph and reach the lungs, liver or brain without passing through the nodes first. One tumour type, choriocarcinoma, is known for this, and your team watches for it through blood markers.
Not sure whether this applies to you?
Ask an oncologistHow it is found
How your team checks whether the nodes are involved
Blood markers
Three proteins, AFP, hCG and LDH, are measured before and after the testicle is removed. If they stay raised afterwards, cancer is likely still present somewhere, even if the scan looks clear.
CT scan of the abdomen and chest
This is the main test. It measures the nodes beside the aorta. A node that is enlarged is suspicious, but small nodes can still hold cancer, and enlarged nodes can be reactive rather than cancerous.
The report on the removed testicle
The tumour type, and whether cancer had entered the blood or lymph vessels inside the testicle, tell the team how likely hidden spread is. This shapes the choice between watching and treating.
Putting it together as a stage
Staging means describing how far the cancer has gone. Stage one means no spread found. Stage two means spread to the abdominal nodes. Stage three means spread beyond them.
On your report
Words on the scan report, in plain language
- Retroperitoneal lymphadenopathy
- Enlarged nodes at the back of the abdomen. Suspicious in someone with testicular cancer, but not proof on its own.
- Para-aortic or paracaval
- Beside the aorta, or beside the vena cava. These describe which side of the two great vessels the nodes sit on.
- Interaortocaval
- Between the aorta and the vena cava. The usual first site for spread from a right-sided cancer.
- Seminoma and non-seminoma
- The two broad families of testicular cancer. Both spread to the same nodes, but they are treated differently once they get there.
- Landing zone
- A surgeon's phrase for the first group of nodes a cancer from one side is expected to reach.
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What it means for treatment
Does spread to these nodes change what happens next?
Yes, but it does not mean the situation is out of hand. Testicular cancer responds well to treatment in most men, including when the abdominal nodes are involved. What changes is the route: watching alone is no longer enough, and the team will weigh chemotherapy, RPLND, or one followed by the other.
Seminoma and non-seminoma take different paths
Seminoma in the abdominal nodes is usually treated with chemotherapy or, for small amounts, radiotherapy. Surgery is rarely the first step. Non-seminoma is where RPLND matters most, either instead of chemotherapy for a small amount of spread, or after chemotherapy to remove whatever is left.
Who this pattern does not apply to
A man whose scrotum was operated on before the diagnosis, or whose testicle never descended, may have a different drainage pattern, and the groin nodes then come into the picture. Tell your team about any earlier groin or scrotal surgery, including hernia repair as a child.
This page cannot tell you your stage or what your own nodes contain. Only the scan, the markers and the pathology report, read together, can do that.Commonly believed
Four things families tell us, and what is actually true
"It has spread to the stomach."
The nodes sit behind the bowel, not in the stomach or the intestines. The cancer has reached the lymph glands of the abdomen, which is a known and expected route, and is treated very differently from a cancer that has grown into an organ.
"If the testicle is out, the spread is gone too."
Removing the testicle removes the source. It does nothing about cells that had already travelled to the nodes. That is what the scans, markers and any further treatment are for.
"He has no back pain, so it cannot have spread."
Enlarged nodes at the back of the abdomen usually cause no symptoms at all until they are large. Most spread is found on a scan, not because of pain, which is why the scan is done even when a man feels entirely well.
"Spread means the cancer is now everywhere."
Spread to the first group of nodes is a step along a known path, not a scattering through the body. Treatment is planned around that path, and the team will tell you plainly whether anything has been found beyond it.
!
One thing that cannot wait
A hard lump or swelling in a testicle, with or without pain, needs a doctor within days, not after the next festival or the next pay-day. If there is also new deep back pain, a swollen leg, or breathlessness, see a doctor the same day and mention the lump. Do not wait for a course of antibiotics to work first.
Questions we are asked
Common questions about where testicular cancer spreads
Why did the scan look at my abdomen when the problem is in the testicle?
Because the abdomen is the first place this cancer goes. The testicle drains to lymph nodes beside the aorta, near the kidneys, so a CT of the abdomen is the standard way to check for spread. A scan that only looked at the scrotum would miss the one place that matters most.
Can it spread to the other testicle?
Direct spread from one testicle to the other is very unusual, because each drains separately. A second cancer can arise in the other testicle years later, which is different from spread. Your team will check the other testicle at diagnosis and during follow-up.
My report says nodes are borderline in size. What does that mean?
It means the nodes are slightly larger than expected but not clearly abnormal. A node can be enlarged for reasons other than cancer. Your team may repeat the scan after a short gap, watch the blood markers, or in some cases recommend surgery to settle the question.
Will I feel it if the nodes are involved?
Usually not. The nodes sit deep, behind the bowel, and small ones cause no symptoms. Only a large mass tends to cause a dull backache, a full feeling, or leg swelling. This is why follow-up relies on scans and blood tests rather than on how you feel.
Does spread to the nodes mean I need chemotherapy?
Often, but not always. For a small amount of non-seminoma spread, surgery to remove the nodes is one option, and chemotherapy is the other. For seminoma, chemotherapy or radiotherapy is more usual. The choice rests with your team and depends on the markers, the scan and the tumour type.
Why does the right side spread differently from the left?
Because the veins on each side join the body's main vessels at different points. The right testicular vein enters the vena cava, the left enters the kidney vein. So the first nodes to be reached are in slightly different places, and the right side crosses over to the left more often.
Can the groin nodes ever be involved?
Rarely, and usually only when the normal drainage has been disturbed, for example by an earlier scrotal operation, a childhood hernia repair, or a testicle that had not descended. Tell your team about any such history so the scan can be read with it in mind.
What should I bring to the appointment about my scan?
The scan itself, on disc or film, not only the report. The pathology report from the testicle operation. The blood marker results, including any taken before the operation. And a family member who will help you decide. If you are unsure what the report means, call the helpline first and we will go through it.
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Dr. Muralidhar Muddusetty
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
Surgical Oncologist
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Dr. Vinay Mamidala
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Dr. Vajja Sandeep Kumar
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Sources
- Cancer Research UK — Testicular cancer: stages and types
- National Cancer Institute — Testicular Cancer Treatment (PDQ) - Patient Version
- American Cancer Society — Testicular Cancer
- NHS — Testicular cancer
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
RPLND: what the operation involvesWhat removing these nodes actually meansPrimary vs post-chemotherapy RPLNDSurgery before chemotherapy, or after itTemplates: full bilateral vs modifiedWhy the left and right sides are cleared differentlyPET-CT scan guideWhen a PET-CT is used and what it can missChemotherapy guideThe other main treatment for node spread
Talk to us
Scan report mentions retroperitoneal nodes?
Send us the scan report, the pathology report and the blood marker results, or call the helpline. An oncologist will read them with you and explain what the team is likely to weigh. One helpline serves every CION centre.