What is the first-line imaging modality for diagnosing intussusception in children?

The first-line imaging modality for diagnosing intussusception in children is ultrasound. This is primarily due to several factors that make ultrasound the preferred choice in pediatric patients.

Ultrasound is a non-invasive and radiation-free method, making it particularly advantageous for children, who are more susceptible to the harmful effects of radiation compared to adults. It is also highly effective in demonstrating the classic “target sign” or “doughnut sign” that is characteristic of intussusception. Additionally, ultrasound allows for real-time visualization, which can be particularly useful in an emergency setting to quickly diagnose the condition.

Other imaging modalities, such as a CT scan and MRI, are indeed useful in certain contexts but are not first-line options for children. A CT scan involves exposure to ionizing radiation and is generally avoided in younger patients if possible. While MRI does not expose patients to radiation, its use is limited due to availability, cost, and the need for prolonged periods of immobility, which can be challenging in acutely ill children.

Plain abdominal X-ray is not as reliable for diagnosing intussusception and may miss the condition or misinterpret findings. Therefore, the combination of effectiveness, safety, and accessibility makes ultrasound the optimal first-line imaging modality for