Myelomeningocele: An Evidence-Based Guide for Patients

Myelomeningocele is a serious form of spina bifida that develops before birth, when the spine and spinal canal do not close completely. With early diagnosis, coordinated treatment, and long-term follow-up, many children can receive support for mobility, bladder and bowel function, learning, and overall quality of life.

Overview: what myelomeningocele is

Myelomeningocele is a birth condition in which part of the spinal cord, nerves, and their protective coverings develop outside the body through an opening in the spine. It is the most severe form of open spina bifida, a type of neural tube defect that forms very early in pregnancy.

Because the exposed nerves are delicate, myelomeningocele can affect how the lower body moves and feels. The impact varies from child to child and depends largely on where the opening is located along the spine and how much nerve tissue is involved.

This condition is not caused by anything a parent did intentionally. It develops during the first weeks of pregnancy, often before a person knows they are pregnant. Early specialist care is important because treatment does not simply close the opening; it also focuses on protecting nerve function, preventing complications, and supporting development over time.

How myelomeningocele affects the body

The spinal cord carries messages between the brain and the rest of the body. In myelomeningocele, those nerve pathways may be damaged or may not develop normally. This can lead to weakness or paralysis in the legs, changes in sensation, and difficulties with bladder or bowel control.

Many children with myelomeningocele also have related conditions. One common issue is hydrocephalus, a buildup of fluid in the brain. Another is Chiari II malformation, in which structures at the back of the brain sit lower than usual. These associated problems can influence feeding, breathing, swallowing, balance, and learning, so they are carefully monitored.

The condition can also affect bones, joints, skin, and the urinary tract over time. For example, limited movement may increase the risk of contractures or scoliosis, and reduced sensation can make pressure injuries easier to miss. This is why long-term care usually includes neurosurgery, rehabilitation, orthopedics, urology, and developmental support.

Symptoms and possible complications

At birth, myelomeningocele usually appears as a sac or opening on the baby’s back, most often in the lower spine. In some cases the nerves are exposed; in others they are covered by a thin membrane. This area requires prompt medical attention to reduce the risk of infection and further nerve injury.

Symptoms vary depending on the location and severity of the defect. A child may have weakness in the legs, trouble moving the feet, reduced feeling below the level of the lesion, or differences in hip and spine alignment. Bladder and bowel dysfunction are also common because the nerves that control these functions may be affected.

Possible complications can include:

• Hydrocephalus
• Chiari II malformation
• Urinary tract infections and kidney problems
• Bowel control difficulties and constipation
• Orthopedic problems such as scoliosis, clubfoot, or joint contractures
• Skin breakdown due to reduced sensation
• Latex sensitivity in some patients
• Learning, attention, or executive function challenges in some children

Not every child will experience all of these complications. The goal of follow-up care is to identify issues early and manage them in a way that supports health, independence, and participation in daily life.

Causes and risk factors

Myelomeningocele develops when the neural tube, the early structure that becomes the brain and spinal cord, does not close completely during the first month of pregnancy. In most cases, there is no single cause. Instead, experts believe it results from a combination of genetic, nutritional, and environmental factors.

A well-established risk factor is too little folate during the period before conception and early pregnancy. For this reason, public health guidance recommends folic acid supplementation for people who may become pregnant. Adequate folate lowers the risk of neural tube defects, although it cannot prevent every case.

Other factors that may increase risk include a previous pregnancy affected by a neural tube defect, certain anti-seizure medicines, poorly controlled diabetes, obesity, and high body temperature early in pregnancy, such as from fever or hot tub exposure. A healthcare professional can advise on risk reduction and preconception planning, especially for families with a prior history of spina bifida.

How myelomeningocele is diagnosed

Myelomeningocele may be detected before birth or diagnosed shortly after delivery. During pregnancy, screening can include maternal blood tests that measure alpha-fetoprotein and detailed fetal ultrasound. If the findings suggest a neural tube defect, further evaluation may be recommended. In some situations, fetal MRI can provide additional detail about the spine and brain.

After birth, diagnosis is usually based on physical examination of the spinal lesion and imaging studies. Doctors may use spinal and brain ultrasound in newborns, as well as MRI to assess the spinal cord, nerves, and related brain changes. These tests help the care team understand the level of the lesion and plan treatment.

Because myelomeningocele can affect several organ systems, assessment usually goes beyond the spine. Kidney and bladder evaluation, orthopedic review, neurological examination, and developmental monitoring all help build a full picture of the child’s needs. This team-based approach supports both urgent treatment and longer-term care planning.

Treatment options and long-term care

Treatment generally begins soon after birth. The first priority is to protect the exposed tissue and lower the risk of infection. Surgical closure of the spinal opening is commonly performed in the first days of life, although the exact timing depends on the baby’s condition and the care team’s assessment. In selected cases diagnosed during pregnancy, fetal surgery may be considered at specialized centers, but it is not suitable for every pregnancy and carries important risks that require careful discussion.

Even after closure, surgery does not reverse existing nerve damage. Ongoing care is therefore essential. Some children need treatment for hydrocephalus, which may include a shunt or other neurosurgical procedures. Related concerns such as tethered cord, orthopedic deformities, or bladder dysfunction may also need specialist treatment over time, including neurosurgical care, pediatric urology evaluation, and structured physical therapy and rehabilitation.

Bladder and bowel management are central parts of care because they protect kidney health and support independence. Plans may include scheduled voiding, catheterization guidance, medicines, bowel routines, nutrition strategies, and regular imaging or urodynamic assessment when appropriate. Mobility support may involve braces, mobility aids, stretching, strengthening, and adaptive equipment.

Children with myelomeningocele often benefit from long-term follow-up in a multidisciplinary clinic. Support may include developmental assessment, school planning, psychological support, skin care education, and orthopedic monitoring. Near the end of the care journey section, families may also wish to know that Acibadem International’s multidisciplinary specialists and JCI-accredited hospitals diagnose and treat myelomeningocele for international patients.

Prevention, daily care, and family support

The most important prevention step is adequate folic acid before conception and during early pregnancy. People planning pregnancy should discuss supplementation with a qualified clinician, especially if there has been a prior neural tube defect, diabetes, or use of medicines that affect folate metabolism. Preconception care can also help optimize diabetes control and review medications safely.

For families caring for a child with myelomeningocele, daily routines can make a meaningful difference. Skin checks are important because reduced sensation may hide pressure areas or injuries. Regular bladder and bowel routines, hydration, nutrition, and mobility exercises can help reduce complications and support comfort and participation in everyday activities.

Emotional and practical support matters too. Families often work closely with pediatricians, therapists, nurses, teachers, and social workers. Clear communication with the care team can help parents understand goals, prepare for surgeries or hospital visits, and adapt care as a child grows into adolescence and adulthood.

When to seek medical care

Immediate medical care is needed if a newborn has a sac, opening, or unusual swelling on the back, especially if the tissue appears exposed. Urgent assessment is also important for fever, redness, drainage, or a change in the wound area after surgery, as these can suggest infection or other complications.

Children with known myelomeningocele should be reviewed promptly if they develop new weakness, increasing leg stiffness, worsening scoliosis, repeated urinary infections, severe constipation, persistent headaches, vomiting, drowsiness, or changes in school performance or behavior. These symptoms can sometimes signal hydrocephalus, shunt problems, tethered cord, or urinary tract complications.

During pregnancy, medical advice should be sought if routine screening raises concern for a spinal defect or if there are questions about folic acid, medication safety, or family history. Early referral to maternal-fetal medicine, neonatology, and pediatric specialists can help families understand the diagnosis and plan next steps, including options related to high-risk obstetric care.

Frequently asked questions

Is myelomeningocele the same as spina bifida?

Myelomeningocele is one type of spina bifida and is the most severe open form. In myelomeningocele, the spinal cord and membranes protrude through an opening in the spine. Other forms of spina bifida may be less severe and may affect the body differently.

Can myelomeningocele be seen before birth?

Yes, myelomeningocele is often detected during pregnancy. Screening blood tests and detailed ultrasound can suggest the diagnosis, and fetal MRI may sometimes be used for more information. Early diagnosis helps families and doctors plan delivery and specialist care.

Does surgery cure myelomeningocele?

Surgery closes the opening in the spine and helps protect the exposed nerves, but it does not reverse nerve damage that has already occurred. Many children still need long-term support for movement, bladder and bowel function, and related conditions such as hydrocephalus. Ongoing follow-up is an important part of care.

Will a child with myelomeningocele be able to walk?

Walking ability varies widely and depends mainly on the level of the spinal lesion and the amount of nerve involvement. Some children walk independently, some use braces or walkers, and others use wheelchairs for some or all mobility. Rehabilitation specialists help determine the safest and most effective mobility plan.

What causes myelomeningocele?

There is usually no single cause. It is thought to result from a combination of genetic and environmental factors that affect early neural tube development. Low folate levels, certain medications, poorly controlled diabetes, and a previous affected pregnancy may increase risk.

Can myelomeningocele be prevented?

Not all cases can be prevented, but adequate folic acid before conception and in early pregnancy significantly lowers the risk of neural tube defects. Preconception counseling can also help review medicines and manage health conditions such as diabetes. A doctor can advise on the right prevention plan for each person.

References

• World Health Organization
• Centers for Disease Control and Prevention
• National Institute of Neurological Disorders and Stroke
• Spina Bifida Association
• American College of Obstetricians and Gynecologists

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.