Intussusception Ultrasound: Preparation, Procedure and Results

Intussusception ultrasound is the preferred first imaging test when a child may have intussusception, a condition in which one part of the bowel slides into another. It is quick, does not use radiation, and can often show whether urgent treatment is needed.

Overview: What Is an Intussusception Ultrasound?

An intussusception ultrasound is an imaging examination used to look for intussusception, a condition where one section of the intestine moves into the section beside it. This can narrow or block the bowel and, if untreated, may affect blood flow to the involved tissue. Intussusception occurs most often in infants and young children, although it can also occur in older children and adults.

Ultrasound uses high-frequency sound waves to create live pictures inside the abdomen. It is especially useful because it can identify the characteristic circular or layered appearance of intussusception while avoiding radiation. In children with symptoms that raise concern for this condition, it is generally the first imaging test used.

The scan helps clinicians make timely decisions, but it is only one part of assessment. A child’s symptoms, physical examination, hydration status, and overall appearance are also important. If intussusception is confirmed, the care team may recommend treatment for intussusception, often with a carefully monitored enema procedure or, less commonly, surgery.

How Ultrasound Detects Intussusception

During an ultrasound, a radiologist or trained sonographer places a small handheld device called a transducer on the abdomen. The device sends sound waves into the body and receives echoes back from tissues and organs. A computer converts these echoes into moving images on a screen.

When bowel has telescoped into itself, the ultrasound may show a round “target” or “doughnut” pattern on images taken across the bowel. Images along the length of the bowel may show a layered, tube-like pattern. The examination can also help show the location and extent of the affected bowel.

Doppler ultrasound may be used during the scan to assess blood flow in the bowel wall. This information can support clinical decision-making, although doctors interpret it together with the child’s condition and other findings. Ultrasound can also sometimes identify alternative explanations for symptoms, such as enlarged lymph nodes, constipation, or other abdominal conditions.

Who May Need This Examination?

Doctors may request an ultrasound when a baby or child has symptoms that could be caused by intussusception. Symptoms may come and go, particularly early in the condition. A child may have sudden episodes of intense abdominal pain, draw the knees toward the chest, cry inconsolably, then seem tired or relatively comfortable between episodes.

Other possible symptoms include vomiting, abdominal swelling, reduced appetite, lethargy, or blood and mucus in the stool. The well-known red, jelly-like stool can occur, but it is not present in every child and may appear later. For this reason, clinicians should not wait for this symptom before arranging assessment when concern is present.

Intussusception can sometimes develop after a viral illness because lymph tissue in the bowel becomes enlarged. In many young children, however, no definite cause is found. Older children and adults are more likely to need evaluation for a structural cause, such as a polyp or another bowel abnormality. Related digestive symptoms may also require assessment for conditions such as bowel obstruction.

Preparation and the Step-by-Step Procedure

Preparation for an intussusception ultrasound is usually simple. If possible, families may be asked not to give the child food or drink for a short period before assessment, particularly when a reduction procedure could be needed soon afterward. However, suspected intussusception should never be delayed because a child has recently eaten; the emergency or pediatric team will provide individual instructions.

At the appointment, the child usually lies on an examination bed, often with a parent or caregiver nearby for reassurance. Warm gel is placed on the skin of the abdomen to help transmit sound waves. The sonographer moves the transducer across different parts of the abdomen and may apply gentle pressure to obtain clear views.

The scan commonly takes about 15 to 30 minutes, although timing varies depending on the child’s comfort, movement, and findings. No needles, contrast dye, or sedation are typically required for the ultrasound itself. A parent may be asked to help keep an infant or young child calm and still; a comfort item, feeding plan approved by the team, or quiet distraction may help.

Images are reviewed by a radiologist or another appropriately trained clinician. If the scan confirms intussusception and the child is clinically stable, the team may arrange an air or liquid contrast enema promptly. This imaging-guided procedure can often both confirm the finding and relieve the telescoping bowel.

Understanding Results and What Happens Next

A positive result means the ultrasound findings support intussusception. The medical team will then consider the child’s symptoms, examination findings, and stability to determine the safest next step. Many children are treated with an image-guided air or contrast enema performed by experienced radiology and pediatric teams.

If an enema reduction is not appropriate, does not resolve the intussusception, or there are signs of a complication, surgery may be needed. Surgery may also be considered when the child is very unwell or when clinicians suspect a bowel perforation or another underlying cause. The choice is individualized and focused on restoring bowel health safely.

A negative or inconclusive ultrasound does not always fully exclude intussusception, especially if symptoms are intermittent and the bowel has temporarily returned to its normal position. If clinical concern remains, doctors may repeat the scan, observe the child, seek specialist input, or use other imaging when appropriate. It is important to return for reassessment if symptoms recur after a reassuring initial examination.

After the scan alone, there is no physical recovery period. If treatment is performed, the child may be observed in hospital for a period of time, depending on symptoms, treatment type, feeding tolerance, and the team’s protocol. Families should follow the discharge plan carefully and ask when normal eating, activity, and follow-up can resume.

Benefits, Limitations, and Possible Risks

The main benefits of ultrasound are that it is noninvasive, painless, widely available, and free from ionizing radiation. It provides real-time images and is highly useful in children, whose body size often allows clear views of the bowel. It can also help guide urgent care without exposing a child to CT radiation.

Ultrasound does have limitations. Bowel gas, movement, body shape, and the position of the bowel may make images harder to interpret. Results also depend on the quality of the equipment and the experience of the person performing and interpreting the examination. For these reasons, doctors consider the scan alongside the child’s symptoms and examination.

The ultrasound examination itself has no known significant physical risks. Gentle pressure on a painful abdomen may be briefly uncomfortable, but it should not cause harm. Risks related to intussusception arise from the condition rather than from ultrasound, which is why prompt assessment is important when symptoms suggest a possible bowel emergency.

When to Seek Medical Care

Parents and caregivers should seek urgent medical care if a child has repeated episodes of severe or cramping abdominal pain, vomiting that is persistent or green, a swollen or tender abdomen, blood in the stool, unusual drowsiness, weakness, or difficulty waking. These symptoms do not always mean intussusception, but they should be assessed without delay.

Medical advice is also important when a child’s pain repeatedly settles and then returns. Intussusception symptoms can be intermittent, and a child may appear relatively well between painful episodes. Trusting a caregiver’s observation that a child is behaving unusually is appropriate, particularly in infants who cannot describe their symptoms.

Families should not attempt to treat suspected intussusception at home with laxatives, enemas, or food and fluids if the child is vomiting or being evaluated urgently. A qualified clinician can determine whether imaging, intravenous fluids, pain relief, or specialist treatment is needed. Acibadem International’s multidisciplinary specialists and JCI-accredited hospitals provide diagnosis and treatment for international patients who require coordinated pediatric and digestive care.

Frequently asked questions

Is ultrasound accurate for intussusception?

Ultrasound is widely used as the first imaging test for suspected intussusception in children and is generally very accurate when performed and interpreted by experienced professionals. However, doctors also consider the child’s symptoms and examination because an intermittent intussusception may not always be visible at one point in time.

Does an intussusception ultrasound hurt?

The ultrasound itself is not painful and does not use needles or radiation. Some gentle pressure on the abdomen may cause temporary discomfort if the child already has abdominal pain.

Does a child need to fast before an intussusception ultrasound?

A care team may advise avoiding food and drink for a short time if a treatment procedure could be needed after the scan. Suspected intussusception is urgent, so families should not delay seeking care in order to fast a child unless a clinician has specifically instructed them to do so.

How long does an intussusception ultrasound take?

The examination often takes around 15 to 30 minutes, but the duration can vary. Additional time may be needed if the child is uncomfortable, moving, or needs further images.

What does a target sign on ultrasound mean?

A target sign is a circular, layered appearance that may be seen when one part of the bowel has moved into another. It is a classic ultrasound finding of intussusception, although the final interpretation is made by the radiology and clinical team.

Can intussusception return after treatment?

Yes, intussusception can recur in some children after successful treatment. Caregivers should seek prompt medical advice if the same symptoms return, including intermittent severe abdominal pain, vomiting, lethargy, or blood in the stool.

References

• American College of Radiology
• American Academy of Pediatrics
• National Institute of Diabetes and Digestive and Kidney Diseases
• Radiological Society of North America
• World Health Organization

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.