What it is (overview)

A Spine Pediatric Ultrasound (USS) is a non-invasive diagnostic imaging test that uses sound waves (not radiation) to create real-time pictures of a child’s spinal canal and surrounding soft tissues. Because ultrasound waves do not expose your child to X-rays, it is commonly used in infants and young children when the bones of the spine have not fully hardened (ossified), allowing the ultrasound to “see” into the spinal canal more clearly.

This test is often called a spinal ultrasound or pediatric spine ultrasound. It can help evaluate the lower spine (lumbosacral area) for spinal abnormalities that may affect nerves and movement. The scan can assess the position and movement of the spinal cord, the fluid-filled space around it, and structures near the spinal canal.

What the results mean (in plain language): A “normal” result generally means the spinal cord and related structures look appropriately positioned and formed for your child’s age, with no signs of a blocked or abnormally anchored cord. An “abnormal” result means the ultrasound found something that may need closer evaluation—such as signs that the spinal cord may be tethered (pulled downward and less mobile), a cyst or fluid collection, or other developmental differences. Ultrasound findings may lead to follow-up testing (often an MRI) or referral to a pediatric specialist (such as pediatric neurology, orthopedics, or neurosurgery).

When & why its usually done

Doctors may order a pediatric spine ultrasound when there are signs, symptoms, or physical findings that raise concern for a problem with spinal development or spinal cord positioning. It is especially useful in babies because it is quick, painless, and does not require radiation.

Common reasons a Spine Pediatric USS is ordered include:

1) Skin or physical findings over the lower back that can sometimes be linked with underlying spinal cord conditions, such as:

• A small dimple above the buttocks (especially if deep, large, or located higher on the back)
• A patch of hair (hair tuft), skin tag, or fatty lump
• A birthmark (certain types of hemangiomas) or unusual skin discoloration
• An asymmetric crease in the buttocks or gluteal cleft

2) Symptoms suggesting nerve or spinal cord involvement (depending on age), such as:

• Leg weakness, stiffness, or uneven leg movement
• Delayed motor milestones, unusual gait, or balance concerns
• Changes in reflexes or muscle tone noted on exam
• Concerns about bladder or bowel function (for example, difficulty voiding or recurrent urinary issues), when clinically appropriate

3) Evaluation of suspected spinal or musculoskeletal conditions where the spine and spinal cord may be involved, including assessment related to tethered cord syndrome or other congenital spinal anomalies.

4) Follow-up of known or suspected spinal abnormalities found on prenatal ultrasound, newborn exams, or earlier imaging.

Although ultrasound can help with certain spine-related concerns, it is not the main test for diagnosing scoliosis (curvature of the spine), which is typically evaluated with physical exam and, when needed, specialized X-ray imaging. However, in selected pediatric cases, ultrasound may be used as an adjunct to evaluate soft tissues or to assess for associated conditions.

Common diseases related to it

• Tethered cord syndrome
• Occult spinal dysraphism (hidden spinal cord/spine development differences)
• Spina bifida occulta
• Dermal sinus tract
• Spinal lipoma / lipomyelomeningocele
• Syringomyelia (fluid cavity within the spinal cord)  may require MRI confirmation
• Congenital spinal anomalies of the lumbosacral region
• Evaluation for associated concerns in some children with scoliosis (case-dependent)

Health goals where it may help

• Early detection of pediatric spinal abnormalities to support timely treatment
• Evaluating possible causes of leg weakness, abnormal muscle tone, or delayed motor development
• Assessing risk of nerve-related complications by screening for tethered cord in appropriate infants
• Supporting child health by reducing radiation exposure through non-invasive diagnostic imaging when suitable
• Guiding next steps in care (e.g., whether MRI, specialist referral, or monitoring is needed)
• Monitoring known spinal conditions over time in coordination with pediatric neurology/orthopedics/neurosurgery