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Childhood Cancer Types — Parent’s Guide
Wilms tumour — kidney cancer in children, explained
Medically reviewed by Dr. C. Raghavendra Reddy, DM (Medical Oncology, Gold Medal) · Last reviewed June 2026
If your child has been found to have a kidney tumour — or if you have been told the words “Wilms tumour” or “nephroblastoma” — you deserve a clear, honest explanation before anything else happens. Wilms tumour is the most common kidney cancer in children. It usually affects young children and, when caught and treated at a specialist centre, the outlook for most children is good. This page explains what Wilms tumour is, how it is recognised, and what the journey from diagnosis to treatment typically looks like.
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Understanding kidney cancer in children
Wilms tumour types and features — what every parent should know
Wilms tumour is not a single, uniform disease. The biology of the tumour — including its cell type, genetic features, and whether both kidneys are involved — guides the treatment plan. Understanding the key distinctions helps parents know what their child’s team is looking for and why certain tests are done.
Most common type
Favourable Histology Wilms Tumour
The majority of Wilms tumours have what pathologists call “favourable histology” — meaning the cells look like embryonic kidney cells that simply stopped maturing, without the features of aggressive cellular change. These tumours tend to respond well to standard treatment. When a child’s biopsy or surgical specimen is examined and described as favourable histology, it is meaningful information: the treatment team can calibrate the intensity of chemotherapy and whether radiation is needed based partly on this finding.
- Cells resemble immature kidney tissue without anaplasia
- Responds well to established treatment regimens
- Accounts for the large majority of all Wilms tumour diagnoses
Less common — needs closer attention
Anaplastic Histology (Diffuse or Focal)
A smaller proportion of Wilms tumours contain cells showing “anaplasia” — a pattern where the nuclei are very enlarged and distorted. Anaplastic Wilms tumour is further classified as focal (limited to one area of the tumour) or diffuse (spread throughout). Diffuse anaplasia is associated with a greater risk that the tumour may be less responsive to standard chemotherapy. The treatment team will recommend a more intensive treatment plan for diffuse anaplastic tumours. This is exactly why accurate pathological examination of the tumour is so important before finalising the treatment programme.
- Characterised by markedly enlarged, irregular cell nuclei
- Focal anaplasia has a better outlook than diffuse anaplasia
- Requires adapted treatment; specialist pathology review is essential
Bilateral in ~5–8% of cases
Unilateral vs Bilateral Wilms Tumour (Stage V)
Most children with Wilms tumour have it in one kidney (unilateral). In a smaller proportion of cases, both kidneys are involved at the time of diagnosis — this is called bilateral or Stage V Wilms tumour. Bilateral Wilms tumour requires a different treatment strategy: chemotherapy is usually given first to shrink the tumours, and surgery is then planned with the primary aim of removing the tumour while sparing as much working kidney tissue as possible on both sides. The goal is to keep the child out of kidney failure in the long run. Managing bilateral disease requires highly specialised surgical and oncological expertise.
- Both kidneys affected simultaneously at diagnosis
- Chemotherapy-first approach to allow kidney-preserving surgery
- Long-term kidney function is the central concern in treatment planning
A precursor finding
Nephrogenic Rests — Precursor Tissue
Nephrogenic rests are clusters of primitive kidney cells that persist in the kidney beyond birth, when they should normally have disappeared. They are not cancer — but they are considered precursor lesions, meaning they represent the kind of immature tissue from which Wilms tumour can arise. Sometimes nephrogenic rests are found in the healthy kidney of a child being treated for Wilms tumour in the other kidney, or they are found incidentally on imaging. Their presence means the child needs closer imaging follow-up over time, as there is a higher chance of a Wilms tumour developing in that kidney later. The oncology team will explain what this finding means for your child’s monitoring plan.
- Not cancer, but a tissue type from which Wilms tumour can arise
- Often found in children with bilateral disease or genetic risk factors
- Requires structured long-term imaging follow-up
Wilms tumour is one of several kidney-related conditions covered under childhood cancer care. For a broader overview of all childhood cancers, visit the Pediatric Cancer hub. If your child’s doctor has mentioned an abdominal lump, see also our guide to abdominal swelling and lumps in young children.
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From first suspicion to treatment completion
How Wilms tumour is diagnosed and treated — step by step
The journey from discovering an abdominal lump to completing treatment follows a structured sequence. Each step is important and each result shapes what comes next. Understanding the pathway helps parents ask the right questions and feel prepared for what is ahead.
Abdominal ultrasound — confirming there is a kidney mass
When a doctor finds or suspects an abdominal mass, the first investigation is an abdominal ultrasound. Ultrasound is non-invasive, uses no radiation, and gives immediate information about whether there is a mass in the kidney, how large it is, whether the mass is solid or fluid-filled, and whether the opposite kidney looks normal. In Wilms tumour, the ultrasound typically shows a well-defined solid mass arising from the kidney. This finding prompts the next step in investigation and referral to a paediatric oncologist for further assessment.
CT scan or MRI — staging and surgical planning
An ultrasound shows that a mass exists; a CT scan or MRI of the abdomen and chest shows exactly how far it has spread. These scans map the tumour in three dimensions, assess whether the tumour has extended into the major blood vessels (particularly the renal vein or the inferior vena cava), look at the lymph nodes around the kidney, and check the lungs for any spread. This information determines the staging of the tumour and whether any pre-operative chemotherapy is needed before surgery. Both kidneys are always assessed carefully, as bilateral involvement (Stage V) changes the treatment approach entirely.
Multidisciplinary team review — planning before any treatment begins
Before treatment starts, the imaging findings are reviewed by a multidisciplinary team (MDT) including a paediatric oncologist, a paediatric surgeon, a radiologist, and a pathologist. At CION, every child’s case is presented at a tumor board meeting before any protocol is recommended. This step is not bureaucracy — it exists to make sure the treatment plan is right for your child specifically. The MDT decides whether to proceed directly to surgery or to give chemotherapy first (pre-operative chemotherapy is common in countries following SIOP guidelines, the international standard). The team will explain this decision and why it applies to your child.
Surgery (nephrectomy) — removing the tumour
Surgery to remove the kidney containing the tumour — called a nephrectomy — is a central part of treatment for most children with Wilms tumour. In a standard nephrectomy for unilateral Wilms tumour, the entire affected kidney, the surrounding fatty tissue (Gerota’s fascia), and the nearby lymph nodes are removed. The surgical specimen is then examined carefully by a pathologist to confirm the diagnosis, determine the histological type (favourable or anaplastic), assess whether the surgical margins are clear, and assign the final stage. This pathological information is essential for determining what further treatment is needed after surgery.
Chemotherapy — before or after surgery
Chemotherapy is part of treatment for almost all children with Wilms tumour. Depending on the treatment protocol, it may be given before surgery to shrink the tumour and make it easier and safer to remove, or after surgery to eliminate any remaining cancer cells and reduce the risk of the disease returning. For children with bilateral Wilms tumour (both kidneys involved), pre-operative chemotherapy is standard because it allows surgeons to preserve more kidney tissue on each side before operating. The specific agents, schedule, and duration of chemotherapy are determined by the tumour’s stage and histology, and are decided as part of the multidisciplinary treatment plan.
Radiation therapy — for selected children
Not all children with Wilms tumour need radiation therapy. Radiation is typically considered for children with Stage III or Stage IV disease, or for those whose tumours show diffuse anaplastic histology. When radiation is used, it is precisely directed at the abdomen (the surgical bed) or at the lungs if lung metastases were found at diagnosis. In children, radiation to the abdomen carries a risk of long-term effects on nearby organs (spine, liver, ovaries or testes), and the decision to use it is always made carefully, weighing the reduction in relapse risk against the possible late effects. The team will discuss this decision in detail before it is made.
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Common questions
Your questions about Wilms tumour — answered
What is Wilms tumour (nephroblastoma) and why does it develop?
Wilms tumour — also called nephroblastoma — is a kidney cancer that arises from immature kidney cells that did not develop properly before or shortly after birth. During normal fetal development, certain primitive kidney cells mature and stop dividing. In children who develop Wilms tumour, some of these immature cells persist and continue to grow abnormally, forming a tumour in one or both kidneys. Wilms tumour is the most common kidney cancer in children and typically affects children between the ages of three and five years. It can also occur in infants and older children, though this is less common. In most cases, Wilms tumour arises without an identifiable cause or family history. A small proportion of cases are associated with certain congenital conditions or genetic changes, but the majority of affected children have no other health problems and no family history of the disease.
What are the warning signs of Wilms tumour in children?
The most common sign of Wilms tumour is a smooth, firm swelling or lump in the child’s abdomen — often noticed by a parent during bathing or dressing, or by a doctor during a routine check. Because the kidney sits at the back of the abdomen, the swelling may not be obviously visible and can grow to a considerable size before it is noticed. Other signs that sometimes accompany the lump include: abdominal pain or discomfort; blood in the urine (which may appear pink or red, though this is not always present); high blood pressure, which the child usually cannot sense but can be detected on examination; loss of appetite and unexplained weight loss; and a general feeling of being unwell or tired without obvious reason. Wilms tumour does not typically cause a fever unless there is another problem alongside it. If you notice any unexplained abdominal swelling in a young child, please see a doctor promptly for an examination — most abdominal lumps in young children are benign, but an abdominal mass always needs a medical assessment.
How is Wilms tumour diagnosed?
When a doctor finds or suspects an abdominal mass in a child, the first step is imaging. An ultrasound scan of the abdomen is usually the first investigation — it can confirm that there is a mass in the kidney, show its size, and give information about whether the opposite kidney appears normal. This is followed by a CT scan or MRI of the abdomen and chest to map the tumour precisely, assess whether it has spread to nearby lymph nodes or other organs (particularly the lungs), and help plan treatment. Blood tests and urine tests are done to assess kidney function and general health. Unlike many other childhood cancers, Wilms tumour is usually not confirmed by biopsy before treatment in countries that follow the international standard approach — instead, treatment often begins based on imaging findings alone when the picture is consistent with Wilms tumour. Your child’s oncology team will explain the exact pathway that applies in your child’s case.
What does the staging of Wilms tumour mean?
Staging describes how far the tumour has spread beyond the kidney at the time of diagnosis. Stage I means the tumour is entirely within the kidney and has been completely removed by surgery. Stage II means the tumour has grown beyond the kidney — into surrounding fat or blood vessels — but has still been completely removed. Stage III means the tumour has spread to nearby lymph nodes or there are tumour deposits in the abdominal area, but no spread to distant organs. Stage IV means the tumour has spread to distant organs — most commonly the lungs, and less often the liver or other sites. Stage V means both kidneys are involved (bilateral Wilms tumour), which requires a different treatment approach designed to preserve as much kidney function as possible. The stage, combined with the tumour’s histological type (whether it is “favourable” or “anaplastic”), determines the treatment plan and intensity.
What does treatment for Wilms tumour involve?
Treatment for Wilms tumour involves a combination of surgery, chemotherapy, and sometimes radiation therapy. For most children in whom the tumour is on one side and appears to be confined to the kidney, surgery to remove the affected kidney (nephrectomy) is performed either before or after chemotherapy, depending on the treatment protocol used by the centre. Chemotherapy is given to eliminate any remaining cancer cells and to reduce the risk of the disease returning. The specific chemotherapy regimen, its duration, and whether radiation therapy is needed depend on the tumour’s stage and histological type. Children with bilateral Wilms tumour (both kidneys affected) are treated differently — chemotherapy is usually given first to shrink the tumours before surgery, with the aim of removing as little kidney tissue as possible on each side. At CION, every child’s case is reviewed at a multidisciplinary tumor board before any treatment begins. We do not make rushed decisions.
Will my child need only one kidney for the rest of their life?
Most children who have one kidney removed for Wilms tumour do very well with a single kidney. The remaining kidney typically adapts and grows to handle the work of two. Children with one kidney can lead full, healthy lives. Long-term, they are advised to avoid activities with a high risk of kidney injury (such as contact sports at a competitive level) and to attend regular check-ups to monitor kidney function and blood pressure. This is a manageable adjustment rather than a limitation on quality of life for most children. For children with bilateral Wilms tumour (both kidneys affected), the surgical goal is to preserve as much working kidney tissue as possible, and the outcome depends on how much healthy kidney tissue can be saved. Your child’s team will provide specific guidance based on the individual situation.
Medical disclaimer: This page is for general information only. It does not replace a consultation with a qualified medical professional. If you are worried about symptoms in your child, please see a doctor promptly. CION Cancer Clinics does not diagnose conditions through this website.
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