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Pediatric Cancer Diagnosis & Tests — Parent Guide
Ultrasound for a childhood abdominal mass — what the scan shows and what happens next
Medically reviewed by Dr. Muralidhar Muddusetty, MS, MCh (Surgical Oncology) · Last reviewed June 2026
If your child's doctor has felt a lump in the abdomen and referred you for an abdominal ultrasound, you are likely scared and full of questions. This page explains exactly what the scan looks for, what the different findings mean, and how the evaluation will proceed — step by step, in plain language. An ultrasound causes no discomfort, uses no radiation, and is always the right first step.
- No radiation, no needles — an abdominal ultrasound uses sound waves only
- Usually completed in 20–40 minutes — you can stay with your child throughout
- Identifies the organ of origin — tells doctors which organ the mass comes from
- Guides every next decision — from further imaging to biopsy planning
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Understanding the investigation
What is an abdominal ultrasound child abdominal lump evaluation?
An abdominal ultrasound is an imaging test that uses high-frequency sound waves — not X-rays — to create live pictures of the organs inside your child's belly. A radiologist or sonographer moves a smooth, handheld probe over the surface of the abdomen while watching the images on a screen. There is no cutting, no needles, and no radiation. Most children describe it as feeling similar to the gel being a little cool.
When a doctor has felt a lump in a child's abdomen — or when a parent has noticed swelling, asymmetry, or fullness in the belly — an ultrasound is always the correct first investigation. It gives the doctor the answers needed before deciding whether more imaging (such as a CT scan or MRI) is necessary, and it does so without any risk to your child.
Specifically, an abdominal ultrasound for a child with a suspected mass will tell the doctor: which organ the mass is attached to or is growing inside (kidney, liver, adrenal gland, spleen, lymph nodes, or bowel); whether the mass is solid (a more important finding that always needs follow-up) or fluid-filled (a cyst, which is usually benign but still needs characterisation); the size of the mass and whether it has a clear border or appears to be infiltrating surrounding tissue; whether blood vessels are running through it (assessed using Doppler colour flow); and whether both kidneys and other abdominal organs look normal.
An ultrasound result alone cannot tell you whether a mass is cancer. It provides essential structural information. A finding of a solid kidney mass in a three-year-old is highly significant and will lead to further imaging and likely to surgical assessment — but the definitive diagnosis always comes from pathology (examining cells or tissue under a microscope). Your doctor will explain exactly what the ultrasound showed and what the next step is.
The scan is usually requested as urgent when a palpable abdominal mass has been found in a child. You should not have to wait more than a few days. If you are struggling to get a timely appointment, speak to your paediatrician and ask for an urgent referral letter. Early imaging leads to earlier diagnosis, and in the childhood cancers that cause abdominal masses, earlier diagnosis leads to better outcomes.
If your child has been referred for this test after a lump was found, you may also want to read our guide to abdominal lumps and swelling in children or visit the Pediatric Cancer overview page.
What to expect on the day
What happens during your child's abdominal ultrasound
Knowing what to expect reduces anxiety for both you and your child. The procedure is gentle and straightforward.
Preparation at home
For most abdominal ultrasounds in children, you will be asked to give your child a light meal or nothing to eat for a few hours before the scan, so that the stomach and bowel are not full of gas that can block the view. The imaging centre will give you specific instructions when you book. Bring your child's referral letter and any previous scans or reports if you have them.
Arriving and preparing your child
You will be asked to remove your child's clothing from the waist down to the lower abdomen and to lay your child on a padded table. You can sit beside the table and hold your child's hand or comfort them throughout. Bring a favourite toy or blanket if your child is young — a calm child makes for a better scan.
Applying the gel and starting the scan
The sonographer or radiologist will apply a warm, water-based gel to the skin of the abdomen. This gel helps the sound waves travel smoothly into the body. The probe is then moved gently across the skin in different directions. Your child may be asked to take a deep breath or lie on their side so different areas can be visualised. It should not hurt. If your child is too young to co-operate fully, the scan may be done while they are asleep or very still.
What the radiologist is looking at
The radiologist examines each organ systematically — both kidneys, the liver, spleen, adrenal glands, lymph nodes, and the bowel. When they locate the mass that the doctor felt, they measure it, assess whether it is solid or cystic, look at the borders, and check blood flow using Doppler ultrasound. They may take measurements and save image clips. The entire examination usually takes between 20 and 40 minutes.
After the scan — the report
The gel is wiped off and your child can dress and have a drink or snack. The radiologist writes a detailed report describing every finding. At CION, reports for paediatric abdominal masses are reviewed the same day. Your referring doctor will receive the report and contact you to discuss what it shows and what the next step is. If the finding is urgent, expect a call the same day.
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Understanding your child's report
What a kidney mass scan or abdominal ultrasound can find
The ultrasound may describe several different types of finding. Here is what each one commonly means and what typically happens next. This is not a substitute for the discussion with your child's specialist.
Needs urgent follow-up
Solid kidney mass
A solid mass arising from or replacing part of the kidney is the most important finding in a young child with an abdominal lump. In children aged 1–5, Wilms tumour (nephroblastoma) is the most common cause. The child will be referred promptly for CT or MRI staging, followed by assessment by a paediatric surgical oncologist. Wilms tumour is one of the most treatable childhood cancers when caught before it has spread.
Needs urgent follow-up
Adrenal or paraspinal mass
A mass sitting on top of the kidney (the adrenal gland) or along the back of the abdomen near the spine raises the possibility of neuroblastoma — a cancer arising from nerve tissue. Neuroblastoma is most common in children under five. Further imaging and urine tests for catecholamines (chemicals that neuroblastoma cells sometimes release) are the next steps. The prognosis varies significantly by the child's age and the stage at diagnosis.
Needs specialist evaluation
Liver mass
A mass inside or on the liver in a young child most commonly suggests hepatoblastoma — a liver tumour that, while uncommon, does occur in young children. An abdominal ultrasound combined with blood tests (including alpha-fetoprotein, or AFP) and a CT or MRI forms the standard workup. Older children with a liver mass may also be investigated for hepatocellular carcinoma, though this is rare in children without underlying liver disease.
Common finding · Needs characterisation
Enlarged abdominal lymph nodes
Swollen lymph nodes in the abdomen (mesenteric or para-aortic nodes) can occur after any infection and usually settle within weeks. However, persistently enlarged nodes or nodes that are growing without a history of recent infection may indicate lymphoma (non-Hodgkin or Hodgkin), which is more common in older children and teenagers. The radiologist will note the size, number, and pattern of lymph node enlargement. If the nodes are large or in unusual locations, further evaluation is arranged.
Usually benign · Still needs review
Simple cyst (kidney, liver, or ovary)
A simple cyst is a thin-walled, smoothly bordered, fluid-filled sac. In the kidney, a simple cyst in a child is usually benign — often a congenital cyst present from birth. In girls, an ovarian cyst discovered as a palpable abdominal lump is most often a benign functional cyst or a benign teratoma (dermoid cyst). A simple cyst does not require biopsy but does need follow-up imaging to confirm it is not growing and does not have internal divisions or thick walls, which would change the assessment.
Common · Usually resolves
Faecal mass or distended bowel
Constipation is one of the most common causes of a palpable abdominal mass in children and one of the easiest to confirm on ultrasound. Compacted stool in the colon appears as a hyperechoic (bright) mass with characteristic posterior shadowing, and its position in the left or mid-abdomen is typical. Once this is identified, treatment is straightforward and the lump resolves. No further oncology assessment is needed unless the constipation is itself unexplained by other factors.
If the ultrasound has identified a mass that needs tissue sampling, your team may arrange an ultrasound-guided biopsy next.
What comes next after your child's abdominal ultrasound?
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Common questions
Questions parents ask about an abdominal ultrasound for a child
What does an abdominal ultrasound actually show when a child has a lump?
An abdominal ultrasound uses sound waves to create real-time images of the organs inside your child's belly — including the kidneys, liver, spleen, adrenal glands, lymph nodes, and the bowel. When a child has a lump or swelling, the ultrasound tells the doctor which organ the mass is attached to or arising from, whether it is solid (more concerning) or fluid-filled (often a cyst, which is usually benign), how large it is and exactly where it sits, and whether there are any visible blood vessels running through it. This information is used to decide what further tests, if any, are needed. It cannot, on its own, tell whether a mass is cancerous — that requires additional imaging and usually a tissue sample (biopsy).
Is an abdominal ultrasound safe for children? Does it hurt?
Yes, an abdominal ultrasound is completely safe for children of any age, including newborns. It uses sound waves, not X-rays, so there is no radiation exposure at all. The procedure causes no pain. A gel is applied to the skin of the abdomen and a handheld probe is moved gently across the surface. Most children tolerate it well, and it is usually over in 20 to 40 minutes depending on what the radiologist needs to look at. For very young or anxious children, the person performing the scan will work slowly and gently. You are usually allowed to stay in the room with your child throughout.
My child's doctor ordered an ultrasound after feeling a lump. How soon should we get it done?
As soon as possible — within a few days, not weeks. When a doctor refers a child for an abdominal ultrasound because of a palpable lump, the investigation is considered time-sensitive. Do not wait for a routine appointment slot if one is not available quickly; call the imaging centre and explain that the referral is for a child with an abdominal mass. Most centres will prioritise this. If your child is unwell, losing weight, has a fever, or the lump appears to be growing rapidly, seek the scan on the same day or attend your nearest paediatric emergency department.
The ultrasound found a solid mass on my child's kidney. What happens next?
A solid kidney mass in a child is taken seriously and the next steps happen quickly. The most common cause in young children is Wilms tumour (nephroblastoma), which is highly treatable when caught early. After the ultrasound, your child will usually be referred for a contrast-enhanced CT scan or MRI of the abdomen and chest. These give more detail about the mass and check whether it has spread. Blood tests, urine tests, and sometimes a chest X-ray are also done. Depending on what the imaging shows, the team — which at CION includes a paediatric surgical oncologist, medical oncologist, and radiation oncologist — will meet as a tumour board to plan the next steps together before any treatment begins.
Will my child need a biopsy after the ultrasound?
Not always, and not immediately after the ultrasound. For some abdominal masses in children — particularly Wilms tumour — the imaging findings combined with the child's age and clinical picture are distinctive enough that surgeons may proceed to surgery without a separate biopsy first. For other types of mass, an ultrasound-guided biopsy (a needle is passed through the skin into the mass using ultrasound for guidance) provides a tissue sample for the pathologist to examine under a microscope. This is the definitive way to confirm what the mass is. The biopsy procedure itself takes about 30 minutes and is done under local anaesthesia or, for younger children, mild sedation. Your child's team will explain exactly what is planned and why.
What if the ultrasound does not show a clear cause for the lump?
An inconclusive ultrasound does not mean the problem has gone away — it means better imaging is needed. Ultrasound has limitations: it can be restricted by bowel gas, and very deep or small masses may not be fully visible. If the ultrasound does not give a clear answer, the next step is typically a contrast-enhanced CT scan or an MRI, which give much more detailed cross-sectional images of the abdomen. If a mass is visible on ultrasound but its nature is unclear, MRI is particularly useful because it provides tissue characterisation without radiation. Do not stop investigating simply because the first test was not conclusive.
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