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PubMed This is a summary of 68 peer-reviewed journal articles Updated
Neurosurgery

Understanding Your Child's Lipomyelomeningocele Diagnosis

At a Glance

Lipomyelomeningocele (LMMC) is a rare, congenital condition where a fatty mass attaches to a child's spinal cord, potentially causing a 'tethered cord.' While it requires specialized care from a neurosurgeon and urologist, early diagnosis through an MRI allows for effective monitoring and treatment.

Finding out your child has lipomyelomeningocele (LMMC) can be a profound shock. You may have expected a routine check-up or a simple explanation for a small mark on your child’s back, only to be met with a complex medical term and a whirlwind of specialists. It is completely normal to feel overwhelmed, but it is important to know that while LMMC is a serious diagnosis, there are clear, established pathways for care and many reasons for hope.

Understanding the Diagnosis

Lipomyelomeningocele is a rare, congenital (present from birth) condition that falls under the category of “closed” spina bifida [1][2]. In this condition, a benign fatty mass (a lipoma) develops under the skin and attaches to the spinal cord [3][4].

Unlike “open” spina bifida, where the spinal cord is exposed to the air at birth, LMMC is covered by skin [5]. It is quite rare, occurring in approximately 0.3 to 0.6 per 10,000 live births. Often, the first sign a parent sees is a “skin marker” on the lower back, such as:

  • A soft, fatty lump under the skin [6][1]
  • A deep dimple or a birthmark
  • A patch of hair or a “tail-like” skin tag [7][8]

To understand the biology behind this and how different subtypes behave, read more in How the Condition Forms and Is Classified.

The Concept of a “Tethered Cord”

The primary concern with LMMC is a process called tethering. Usually, as a child grows, the spinal cord needs to be able to move freely within the spinal canal. In children with LMMC, the fatty mass acts like an anchor, “tethering” the spinal cord to the surrounding tissue [9][10].

As your child grows, this anchor pulls on the spinal cord, stretching it. If left unmanaged, this tension can lead to progressive changes in how the nerves work [3][2]. Doctors focus on monitoring your child to prevent or treat these changes. You can learn exactly what to watch for in Recognizing the Signs of Tethered Cord Syndrome.

Reassuring Facts for Parents

While the diagnosis is life-changing, several facts can offer immediate reassurance:

  • It is not your fault: LMMC is a developmental hiccup that happens very early in pregnancy; nothing you did or didn’t do caused this [1].
  • Highly visible care pathways: Because these markers are often caught early, children are frequently diagnosed before they develop any symptoms [11][12].
  • Advanced imaging: We have excellent tools, like MRI (Magnetic Resonance Imaging), to see exactly how the fat is attached and plan the best care without using radiation [13][11]. Note that for babies and toddlers, an MRI typically requires sedation or general anesthesia so they can remain perfectly still.
  • Expert teams: Your child will be cared for by a multidisciplinary team—usually including a neurosurgeon and a urologist—who specialize in protecting nerve function and supporting your child’s development [14][15]. Learn more about Building Your Child’s Care Team.
  • Future Pregnancies: Because LMMC is a neural tube defect, parents do have a higher risk of having another child with a similar condition. If you plan to expand your family, speak with your doctor or a genetic counselor about high-dose folic acid supplementation before becoming pregnant.

Early intervention and regular follow-up with these specialists are the most effective ways to preserve your child’s function and quality of life [16][17]. Discover more about Surgery and the ‘Watch and Wait’ Debate and Long-Term Survivorship and Monitoring.

In this guide

5 chapters

01

How the Condition Forms and Is Classified

Learn how lipomyelomeningocele (LMMC) forms during pregnancy and understand the different classification types, including Chapman and NCSL, and what they mean.

02

Recognizing the Signs of Tethered Cord Syndrome

Learn the early signs of tethered cord syndrome in children with lipomyelomeningocele (LMMC). Understand neurological, urological, and orthopedic symptoms.

03

Surgery and the 'Watch and Wait' Debate

Learn about lipomyelomeningocele (LMMC) surgery options. Compare the benefits of early prophylactic surgery versus the watch and wait approach for your child.

04

Building Your Child's Care Team

Learn how to build a multidisciplinary care team for a child with lipomyelomeningocele (LMMC). Find out which specialists you need and what to ask them.

05

Long-Term Survivorship and Monitoring

Learn about long-term survivorship and monitoring for lipomyelomeningocele (LMMC). Understand retethering risks, bladder management, and follow-up care.

Common questions in this guide

What is a lipomyelomeningocele (LMMC)?
Lipomyelomeningocele is a rare type of closed spina bifida present at birth. It involves a benign fatty mass under the skin of the lower back that attaches to the spinal cord.
What are the visible signs of LMMC on a baby's back?
Parents often notice skin markers on their baby's lower back. These can include a soft, fatty lump under the skin, a deep dimple, a birthmark, a patch of hair, or a small skin tag.
What does it mean if my child has a tethered spinal cord?
A tethered cord happens when the fatty mass anchors the spinal cord to surrounding tissue. As your child grows, this tether pulls and stretches the spinal cord, which can affect nerve function over time if not monitored or treated.
What specialists will my child need to see for LMMC?
Your child's care team will typically be led by a pediatric neurosurgeon and a pediatric urologist. These specialists work together to monitor spinal cord tension and protect bladder, bowel, and leg function.
Did I do something during pregnancy to cause my baby's LMMC?
No. Lipomyelomeningocele is a developmental event that occurs very early in pregnancy, and it is not caused by anything a parent did or did not do.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Was my child's condition found through a physical exam, a skin marker, or a routine screening?
  2. 2.Does the MRI show that the fatty mass is pulling on the spinal cord (tethering) right now?
  3. 3.What specific symptoms should I be watching for in my child’s leg movements or diaper habits?
  4. 4.When do we need to meet with a pediatric neurosurgeon and a pediatric urologist?
  5. 5.Should we consider genetic counseling or high-dose folic acid for future pregnancies?

Questions For You

Tap a prompt to share your answer — we'll use it plus this page's context to start a tailored conversation.

References

References (17)
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    Prenatal diagnosis of lipomyelomeningocele by ultrasound and magnetic resonance imaging (MRI).

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    Late diagnosis of dorsolumbar lipomyelomeningocele with tethered cord in a middle aged adult: A case report from Nepal.

    Aryal S, Poudel S, Sharma S, Deo S

    Radiology case reports 2022; (17(12)):4532-4536 doi:10.1016/j.radcr.2022.08.064.

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    Neurosurgical management and pathology of lumbosacral lipomas with tethered cord.

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    Neuropathology : official journal of the Japanese Society of Neuropathology 2017; (37(5)):385-392 doi:10.1111/neup.12382.

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    Aberrant Dorsal Nerve Root as a Concomitant Cause of Spinal Cord Tethering Associated with a Dorsal Type Lipomyelomeningocele in a Child With Caudal Agenesis.

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    Repair of refractory postoperative cerebrospinal fluid leakage using a reversed dermis flap in a pediatric lipomyelomeningocele patient.

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This page provides educational information about lipomyelomeningocele for parents and caregivers. It does not replace professional medical advice from your child's pediatric neurosurgeon or urologist.

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