Medical Oncologist
CION Cancer Clinics
Abdominal ultrasound screening for children at risk of Wilms tumour | CION Cancer Clinics
Children born with certain gene changes or syndromes have a higher chance of Wilms tumour in early childhood. Regular tummy ultrasound scans can find a tumour while it is small, when treatment is simpler. The scans are painless, use no radiation and stop once the risk years pass. This page explains who needs them, how the schedule runs, and which signs cannot wait. At CION Cancer Clinics, our oncologists explain what a gene result means for you and your family, and plan the checks that follow.
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Medically reviewed by Dr. Naresh GunduConsultant Medical Oncologist · MBBS, DNB (Internal Medicine), DM (Medical Oncology, AIIMS) · last reviewed September 2026, next review due September 2027
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On this page
The short answer
Why does my child need regular tummy scans?
Some children are born with a gene change or syndrome that raises the chance of Wilms tumour, a kidney cancer of early childhood. A regular ultrasound of the tummy can find such a tumour while it is still small. Published guidance commonly advises a scan about every three months, through the early years when the risk is highest.
What the scans are looking for
Mainly a lump growing in either kidney. In children with Beckwith-Wiedemann syndrome the scan in the first years also covers the liver, because a liver tumour called hepatoblastoma is possible in infancy. A blood test is often added for that.
Why the spacing matters
Wilms tumours can grow quickly. Scans spaced a few months apart are meant to catch one before it becomes large enough to feel. Tumours found this way tend to be smaller, and surgeons can more often keep part of the kidney. A long gap between scans loses much of that benefit.
Ultrasound uses sound waves. There is no radiation, no needle and no sedation for a routine scan.Who is offered screening
Which children need these scans, and which do not?
Screening is offered when a child's chance of Wilms tumour is clearly higher than usual. The exact threshold differs between guidelines.
Usually offered
Children whose condition carries a well recognised raised risk.
- WAGR, Denys-Drash or Frasier syndrome
- Many forms of Beckwith-Wiedemann syndrome
- Perlman syndrome
- A family Wilms gene fault the child carries
Decided case by case
Overgrowth of one side of the body, some rarer genes, and some lower risk subtypes of Beckwith-Wiedemann syndrome. Several countries now tailor scans to the subtype, and some low risk groups are offered fewer scans or none.
Usually not needed
Brothers and sisters who tested negative for the family fault. Siblings of a child whose Wilms tumour was not inherited. Children who have passed the age when the risk falls away.
Why not scan everyone at risk?
Frequent scans bring travel, cost, missed school and worry, and they sometimes show harmless findings that need more tests. Screening is offered where the benefit clearly outweighs that burden.
Not sure whether this applies to you?
Ask an oncologist
!
What cannot wait for the next scan
If you feel a firm lump in your child's tummy, the tummy suddenly swells, or you see blood or dark, cola-coloured urine, contact your child's doctor the same day. Ask for an ultrasound that day or the next. Do not wait for the next booked scan, even if it is only a few weeks away. Most of these turn out to be something simple, but only a scan can tell.
Over the years
How does the scan schedule usually run?
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From diagnosis
Scans start as soon as the condition or gene change is confirmed, often in the first months of life. The first scan gives a baseline for every later one.
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The infant and toddler years
In Beckwith-Wiedemann syndrome, the whole tummy including the liver is scanned, with a blood test for a liver tumour marker called alpha-fetoprotein. For WT1 conditions, the focus is the kidneys.
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The pre-school years
Kidney scans continue about every three months. Liver checks usually stop once the liver tumour risk has passed, while kidney checks carry on.
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Around school age
Published guidance commonly stops routine scans around the eighth birthday, a little earlier in some countries. A few conditions, such as WAGR, may need longer.
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After scans stop
Some children still need kidney function and blood pressure checks, especially with WT1 changes. Your specialist will say which apply.
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On the scan report
The words you may see, in plain language
- Renal ultrasound
- A scan of both kidneys using sound waves. It shows their size, shape and any lump.
- Abdominal ultrasound
- A wider scan that also covers the liver and other organs in the tummy.
- Space-occupying lesion or mass
- A lump that needs a closer look. It does not always mean a tumour.
- Cyst
- A small fluid-filled pocket. Most are harmless and are simply watched on the next scan.
- Nephromegaly
- Kidneys larger than usual for the child's age, common in overgrowth conditions.
- Alpha-fetoprotein
- A blood marker. A rising level in a young child can be an early sign of a liver tumour.
Commonly believed
Four things parents tell us, and what is actually true
"Repeated scans will harm my child."
Ultrasound uses sound waves, not X-rays. It is considered safe to repeat as often as the schedule asks, which is why it is the test chosen for young children.
"My child looks healthy, so we can skip one."
A small Wilms tumour causes no symptoms. That is the whole reason for scanning a well child. If a scan is missed, rebook it as soon as you can rather than waiting for the next slot.
"Something showed up, so it must be cancer."
Many findings are harmless, such as a cyst or a slightly larger kidney. Your child may need another scan sooner, or an MRI, before anyone can say what it is.
"Any ultrasound centre will do."
A centre that scans young children regularly is more likely to see small changes clearly. Using the same centre each time makes comparisons easier, and the report must reach the specialist.
Being straight with you
What this page cannot tell you
It cannot tell you whether your own child needs screening, or exactly how often. That depends on the precise condition, and in Beckwith-Wiedemann syndrome on the molecular subtype. It is decided by the genetics and paediatric team who know your child.
It cannot read a scan report for you
Words like mass or lesion sound alarming out of context. A radiologist and the child's specialist read the report together with earlier scans. Ask them what a finding means before searching online.
Who this does not apply to
Most children never need these scans. A single relative who had Wilms tumour does not by itself mean a child should be screened. Nor does a child whose sibling's tumour was not inherited. If you are unsure which group your child is in, a counsellor can tell you plainly, including when the answer is that no scans are needed.
Evidence on the best schedule comes from fairly small studies, which is why guidance differs a little between countries.Questions we are asked
Common questions about screening scans
How often does my child need a scan?
Published guidance commonly advises about every three months through early childhood. Some lower risk groups are offered fewer scans. Your child's specialist sets the exact schedule and will tell you when it ends.
Does my child need to fast or prepare?
Most kidney scans need no preparation. If the liver is being scanned too, the centre may ask for a short gap after a feed. Bring a favourite toy or a feed to keep a young child calm on the couch.
Can I stay with my child during the scan?
Yes. Parents usually stay and can hold the child's hand or sit beside them. Gel is spread on the tummy and a small probe moved over the skin. It does not hurt, though the gel can feel cold.
What happens if the scan finds something?
The report goes to your child's specialist, who may ask for a repeat scan sooner or an MRI. If a tumour is likely, your child is referred quickly to a paediatric oncology team. Many findings turn out to be harmless.
We live far from Hyderabad. Can scans be done locally?
Often, yes. Ask your specialist to name a centre near you that scans young children regularly, and make sure every report is sent to them. Keep copies in one folder to bring to each review.
Should I check my child's tummy at home?
Some teams teach parents to feel the tummy gently, for example at bath time. It does not replace scans. If you ever feel a firm lump or see blood in the urine, contact your child's doctor the same day.
What if we miss a scan?
Rebook it as soon as you can and let the specialist know. Do not simply wait for the next planned date. One late scan is rarely a disaster, but repeated long gaps undo the point of the schedule.
When do the scans finally stop?
Usually around school age, when the chance of a new Wilms tumour becomes very small. The exact age depends on the condition. Your specialist will confirm the last scan, and any kidney checks that continue after it.
Your Specialists
Meet CION's oncologists. Bring your family history or genetic report to them.
Our medical oncologists see people with a strong family history of cancer, arrange genetic counselling and testing where it fits, and plan the checks that follow.
Medical Oncologist
Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
Medical Oncologist
Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
Medical Oncologist
Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
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Sources
- National Cancer Institute — Wilms Tumor and Other Childhood Kidney Tumors Treatment (PDQ) – Patient Version
- National Cancer Institute — Wilms Tumor and Other Childhood Kidney Tumors Treatment (PDQ) – Health Professional Version
- GeneReviews (NCBI) — Beckwith-Wiedemann Syndrome
- MedlinePlus Genetics — Beckwith-Wiedemann syndrome
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
Surveillance for Wilms tumour gene carriersThe full check-up schedule, condition by conditionBeckwith-Wiedemann syndrome and tumour screeningWhy liver checks are added in BWSWilms tumour gene positive: what happens nextThe plan after a positive resultTesting the family for the Wilms tumour genesWhether brothers and sisters need scans too
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Not sure whether your child needs screening scans?
Tell us your child's diagnosis and what the doctors have said so far. We will help you reach a team who can confirm the right schedule. One helpline serves every CION centre.