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Spina bifida

Medically reviewed on Mar 9, 2018

Overview

Spina bifida is a birth defect that occurs when the spine and spinal cord don't form properly. It falls under the broader category of neural tube defects. The neural tube is the embryonic structure that eventually develops into the baby's brain and spinal cord and the tissues that enclose them.

Normally, the neural tube forms early in pregnancy, and it closes by the 28th day after conception. In babies with spina bifida, a portion of the neural tube fails to develop or close properly, causing defects in the spinal cord and in the bones of the spine.

Spina bifida can range from mild to severe, depending on the type of defect, size, location and complications. When early treatment for spina bifida is necessary, it's done surgically, although such treatment doesn't always completely resolve the problem.

Types

Spina bifida can occur in different forms: spina bifida occulta, meningocele (muh-NING-go-seel) or myelomeningocele (my-uh-lo-muh-NING-go-seel). The severity of spina bifida depends on the type, size, location and complications.

Spina bifida occulta

"Occulta" means hidden. The mildest form, spina bifida occulta results in a small separation or gap in one or more of the bones of the spine (vertebrae). Many people who have spina bifida occulta don't even know it, unless the condition is discovered during an imaging test done for unrelated reasons.

Meningocele

In a form of spina bifida called meningocele, the protective membranes around the spinal cord (meninges) push out through the opening in the vertebrae, forming a sac filled with fluid. But this sac doesn't include the spinal cord, so nerve damage is less likely, though later complications are possible.

Myelomeningocele

Also known as open spina bifida, myelomeningocele is the most severe form. The spinal canal is open along several vertebrae in the lower or middle back. The membranes and spinal nerves push through this opening at birth, forming a sac on the baby's back, typically exposing tissues and nerves. This makes the baby prone to life-threatening infections.

Spina bifida (myelomeningocele)

Myelomeningocele is a severe form of spina bifida, in which the membranes and the spinal nerves protrude at birth, forming a sac on the baby's back. The exposed nervous system may become infected, so prompt surgery is needed after birth.

Symptoms

Signs and symptoms of spina bifida vary by type and severity. Symptoms can also differ for each person.

  • Spina bifida occulta. Because the spinal nerves usually aren't involved, typically there are no signs or symptoms. But visible indications can sometimes be seen on the newborn's skin above the spinal defect, including an abnormal tuft of hair, or a small dimple or birthmark.
  • Meningocele. The membranes around the spinal cord push out through an opening in the vertebrae, forming a sac filled with fluid, but this sac doesn't include the spinal cord.
  • Myelomeningocele. In this severe form of spina bifida:
    • The spinal canal remains open along several vertebrae in the lower or middle back.
    • Both the membranes and the spinal cord or nerves protrude at birth, forming a sac.
    • Tissues and nerves usually are exposed, though sometimes skin covers the sac.

When to see a doctor

Typically, meningocele and myelomeningocele are diagnosed before or right after birth, when medical care is available. These children should be followed by a specialized team of doctors throughout their lives and families should be educated on the different complications to watch for.

Children with spina bifida occulta typically don't have any symptoms or complications, so usually only routine pediatric care is needed.

Causes

Doctors aren't certain what causes spina bifida. As with many other problems, it appears to result from a combination of genetic and environmental risk factors, such as a family history of neural tube defects and folate deficiency.

Risk factors

Spina bifida is more common among whites and Hispanics, and females are affected more often than males. Although doctors and researchers don't know for sure why spina bifida occurs, they have identified some risk factors:

  • Folate deficiency. Folate (vitamin B-9) is important to the healthy development of a baby. Folate is the natural form of vitamin B-9. The synthetic form, found in supplements and fortified foods, is called folic acid. A folate deficiency increases the risk of spina bifida and other neural tube defects.
  • Family history of neural tube defects. Couples who've had one child with a neural tube defect have a slightly higher chance of having another baby with the same defect. That risk increases if two previous children have been affected by the condition. In addition, a woman who was born with a neural tube defect has a greater chance of giving birth to a child with spina bifida. However, most babies with spina bifida are born to parents with no known family history of the condition.
  • Some medications. For example, anti-seizure medications, such as valproic acid (Depakene), seem to cause neural tube defects when taken during pregnancy, possibly because they interfere with the body's ability to use folate and folic acid.
  • Diabetes. Women with diabetes who don't control their blood sugar well have a higher risk of having a baby with spina bifida.
  • Obesity. Pre-pregnancy obesity is associated with an increased risk of neural tube birth defects, including spina bifida.
  • Increased body temperature. Some evidence suggests that increased body temperature (hyperthermia) in the early weeks of pregnancy may increase the risk of spina bifida. Elevating your core body temperature, due to fever or the use of saunas or hot tubs, has been associated with a possible slight increased risk of spina bifida.

If you have known risk factors for spina bifida, talk with your doctor to determine if you need a larger dose or prescription dose of folic acid, even before a pregnancy begins.

If you take medications, tell your doctor. Some medications can be adjusted to diminish the potential risk of spina bifida, if plans are made ahead of time.

Complications

Spina bifida may cause minimal symptoms or only minor physical disabilities. If the spina bifida is severe, sometimes it leads to more significant physical disabilities. Severity is affected by:

  • The size and location of the neural tube defect
  • Whether skin covers the affected area
  • Which spinal nerves come out of the affected area of the spinal cord

This list of possible complications may seem overwhelming, but not all children with spina bifida get all these complications. And these conditions can be treated.

  • Walking and mobility problems. The nerves that control the leg muscles don't work properly below the area of the spina bifida defect, causing muscle weakness of the legs, sometimes involving paralysis. Whether a child can walk typically depends on where the defect is, its size, and the care received before and after birth.
  • Orthopedic complications. Children with myelomeningocele can have a variety of problems in the legs and spine because of weak muscles in the legs and back. The types of problems depend on the level of the defect. Possible problems include a curved spine (scoliosis), abnormal growth or dislocation of the hip, bone and joint deformities, muscle contractures and other orthopedic concerns.
  • Bowel and bladder problems. Nerves that supply the bladder and bowels usually don't work properly when children have myelomeningocele. This is because the nerves that supply the bowel and bladder come from the lowest level of the spinal cord.
  • Accumulation of fluid in the brain (hydrocephalus). Babies born with myelomeningocele commonly experience accumulation of fluid in the brain, a condition known as hydrocephalus.
  • Shunt malfunction. Shunts can stop working or become infected. Warning signs may vary. Some of the warning signs of a shunt that isn't working include headaches, vomiting, sleepiness, irritability, swelling or redness along the shunt, confusion, changes in the eyes (fixed downward gaze), trouble feeding, or seizures.
  • Chiari malformation type II. Chiari malformation (kee-AH-ree mal-for-MAY-shun) type II is a common brain abnormality in children with the myelomeningocele form of spina bifida. The brainstem, or lowest part of the brain above the spinal cord, is elongated and positioned lower than usual. This can cause problems with breathing and swallowing. Rarely, compression on this area of the brain occurs and surgery is needed to relieve the pressure.
  • Infection in the tissues surrounding the brain (meningitis). Some babies with myelomeningocele may develop meningitis, an infection in the tissues surrounding the brain. This potentially life-threatening infection may cause brain injury.
  • Tethered spinal cord. Tethered spinal cord results when the spinal nerves become bound to the scar where the defect was closed surgically, making the spinal cord less able to grow as the child grows. This progressive tethering can cause loss of muscle function to the legs, bowel or bladder. Surgery can limit the degree of disability.
  • Sleep-disordered breathing. Both children and adults with spina bifida, particularly myelomeningocele, may have sleep apnea or other sleep disorders. Assessment for a sleep disorder in those with myelomeningocele helps detect sleep-disordered breathing, such as sleep apnea, which warrants treatment to improve health and quality of life.
  • Skin problems. Children with spina bifida may get wounds on their feet, legs, buttocks or back. They can't feel when they get a blister or sore. Sores or blisters can turn into deep wounds or foot infections that are hard to treat. Children with myelomeningocele have a higher risk of wound problems in casts.
  • Latex allergy. Children with spina bifida have a higher risk of latex allergy, an allergic reaction to natural rubber or latex products. Latex allergy may cause rash, sneezing, itching, watery eyes and a runny nose. It can also cause anaphylaxis, a potentially life-threatening condition in which swelling of the face and airways can make breathing difficult. So it's best to use latex-free gloves and equipment at delivery time and when caring for a child with spina bifida.
  • Other complications. More problems may arise as children with spina bifida get older, such as urinary tract infections, gastrointestinal (GI) disorders and depression. Children with myelomeningocele may develop learning disabilities, such as problems paying attention, and difficulty learning reading and math.

Prevention

Folic acid, taken in supplement form starting at least one month before conception and continuing through the first trimester of pregnancy, greatly reduces the risk of spina bifida and other neural tube defects.

Get folic acid first

It's critical to have enough folic acid in your system by the early weeks of pregnancy to prevent spina bifida. Because many women don't discover that they're pregnant until this time, experts recommend that all women of childbearing age take a daily supplement of 400 micrograms (mcg) of folic acid.

Several foods, including enriched bread, pasta, rice and some breakfast cereals, are fortified with 400 mcg of folic acid per serving. Folic acid may be listed on food packages as folate, which is the natural form of folic acid found in foods.

Planning pregnancy

If you're actively trying to conceive, most pregnancy experts believe supplementation of at least 400 mcg of folic acid a day is the best approach for women planning pregnancy.

Your body doesn't absorb folate as easily as it absorbs synthetic folic acid, and most people don't get the recommended amount of folate through diet alone, so vitamin supplements are necessary to prevent spina bifida. And, it's possible that folic acid will also help reduce the risk of other birth defects, including cleft lip, cleft palate and some congenital heart defects.

It's also a good idea to eat a healthy diet, including foods rich in folate or enriched with folic acid. This vitamin is present naturally in many foods, including:

  • Beans
  • Citrus fruits and juices
  • Egg yolks
  • Dark green vegetables, such as broccoli and spinach

When higher doses are needed

If you have spina bifida or if you've given birth to a child with spina bifida, you'll need extra folic acid before you become pregnant. If you're taking anti-seizure medications or you have diabetes, you may also benefit from a higher dose of this B vitamin. But check with your doctor before taking additional folic acid supplements.

Diagnosis

If you're pregnant, you'll be offered prenatal screening tests to check for spina bifida and other birth defects. The tests aren't perfect. Some mothers who have positive blood tests have normal babies. Even if the results are negative, there's still a small chance that spina bifida is present. Talk to your doctor about prenatal testing, its risks and how you might handle the results.

Blood tests

Your doctor will most likely check for spina bifida by first performing these tests:

  • Maternal serum alpha-fetoprotein (MSAFP) test. For the MSAFP test, a sample of the mother's blood is drawn and tested for alpha-fetoprotein (AFP) — a protein produced by the baby. It's normal for a small amount of AFP to cross the placenta and enter the mother's bloodstream. But abnormally high levels of AFP suggest that the baby has a neural tube defect, such as spina bifida, though some spina bifida cases don't produce high levels of AFP.
  • Test to confirm high AFP levels. Varying levels of AFP can be caused by other factors — including a miscalculation in fetal age or multiple babies — so your doctor may order a follow-up blood test for confirmation. If the results are still high, you'll need further evaluation, including an ultrasound exam.
  • Other blood tests. Your doctor may perform the MSAFP test with two or three other blood tests. These tests are commonly done with the MSAFP test, but their objective is to screen for other abnormalities, such as trisomy 21 (Down syndrome), not neural tube defects.

Ultrasound

Many obstetricians rely on ultrasonography to screen for spina bifida. If blood tests indicate high AFP levels, your doctor will suggest an ultrasound exam to help determine why. The most common ultrasound exams bounce high-frequency sound waves off tissues in your body to form images on a video monitor.

The information these images provide can help establish whether there's more than one baby and can help confirm gestational age, two factors that can affect AFP levels. An advanced ultrasound also can detect signs of spina bifida, such as an open spine or particular features in your baby's brain that indicate spina bifida.

Amniocentesis

If a blood test shows high levels of AFP in your blood but the ultrasound is normal, your doctor may offer amniocentesis. During amniocentesis, your doctor uses a needle to remove a sample of fluid from the amniotic sac that surrounds the baby.

An analysis of the sample indicates the level of AFP present in the amniotic fluid. A small amount of AFP is normally found in amniotic fluid. However, when an open neural tube defect is present, the amniotic fluid contains an elevated amount of AFP because the skin surrounding the baby's spine is gone and AFP leaks into the amniotic sac.

Discuss the risks of amniocentesis, including a slight risk of loss of the pregnancy, with your doctor.

Treatment

Spina bifida treatment depends on the severity of the condition. Spina bifida occulta often doesn't require treatment at all, but other types of spina bifida do.

Surgery before birth

Nerve function in babies with spina bifida can worsen after birth if it's not treated. Prenatal surgery for spina bifida (fetal surgery) takes place before the 26th week of pregnancy. Surgeons expose a pregnant mother's uterus surgically, open the uterus and repair the baby's spinal cord.

Research suggests that children with spina bifida who had fetal surgery may have reduced disability and be less likely to need crutches or other walking devices. In addition, fetal surgery may reduce the risk of hydrocephalus. Ask your doctor whether this procedure may be appropriate for you. Discuss the risks, such as possible premature delivery and other complications, and potential benefits for you and your baby.

It's important to have a comprehensive evaluation to determine whether fetal surgery is feasible. This specialized surgery should only be done at a health care facility that has experienced fetal surgery experts, a multispecialty team approach and neonatal intensive care. Typically the team includes a fetal surgeon, pediatric neurosurgeon, maternal-fetal medicine specialist, fetal cardiologist and neonatologist.

Cesarean birth

Many babies with myelomeningocele tend to be in a feet-first (breech) position. If your baby is in this position or if your doctor has detected a large cyst or sac, cesarean birth may be a safer way to deliver your baby.

Surgery after birth

Meningocele involves surgery to put the meninges back in place and close the opening in the vertebrae. Because the spinal cord develops normally in babies with meningocele, these membranes often can be removed by surgery with little or no damage to nerve pathways.

Myelomeningocele also requires surgery. Performing the surgery early can help minimize risk of infection that's associated with the exposed nerves and may also help protect the spinal cord from more trauma.

During the procedure, a neurosurgeon places the spinal cord and exposed tissue inside the baby's body and covers them with muscle and skin. Sometimes a shunt to control hydrocephalus in the baby's brain is placed during the operation on the spinal cord.

Treatment for complications

In babies with myelomeningocele, irreparable nerve damage has likely already occurred and ongoing care from a multispecialty team of surgeons, physicians and therapists is usually needed. Babies with myelomeningocele may need more surgery for a variety of complications. Treatment for complications — such as weak legs, bladder and bowel problems or hydrocephalus — typically begins soon after birth.

Depending on the severity of spina bifida and the complications, treatment may include, for example:

  • Walking and mobility aids. Some babies may start exercises to prepare their legs for walking with braces or crutches when they're older. Some children may need walkers or a wheelchair. Mobility aids, along with regular physical therapy, can help a child become independent.
  • Bowel and bladder management. Routine bowel and bladder evaluations and management plans help reduce the risk of organ damage and illness. Evaluations include X-rays, kidney scans, ultrasounds, blood tests and bladder function studies. These evaluations will be more frequent in the first few years of life, but less often as children grow.
    • Bowel management may include oral medications, suppositories, enemas, surgery, or a combination of these approaches.
    • Bladder management may include medications, using catheters to empty the bladder, surgery, or a combination.
    • For children, a specialist in pediatric urology with experience in evaluating and performing surgery on children with spina bifida is the best choice.
  • Surgery for hydrocephalus. Most babies with myelomeningocele will need a ventricular shunt — a surgically placed tube that allows fluid in the brain to drain into the abdomen. This tube might be placed just after birth, during the surgery to close the sac on the lower back or later as fluid accumulates. A less invasive procedure, called endoscopic third ventriculostomy, may be used, but candidates must be carefully chosen and meet certain criteria. The surgeon uses a small video camera to see inside the brain and makes a hole in the bottom of or between the ventricles so cerebrospinal fluid can flow out of the brain.
  • Treatment and management of other complications. To help with functioning, special equipment such as bath chairs, commode chairs and standing frames may be needed. Whatever the issue — orthopedic complications, tethered spinal cord, GI issues, skin problems, or others — most spina bifida complications can be treated or at least managed to improve quality of life.

Ongoing care

Children with spina bifida need close follow-up care and observation. Their primary care doctors follow growth, the need for immunizations and general medical issues. They coordinate your child's medical care.

Children with spina bifida also often need treatment and ongoing care from:

  • Physical medicine and rehabilitation
  • Neurology
  • Neurosurgery
  • Urology
  • Orthopedics
  • Physical therapy
  • Occupational therapy
  • Special education teachers
  • Social workers
  • Dietitians

Parents and other caregivers are a key part of the team, learning how to help manage their child's condition and how to encourage and support their child emotionally and socially. Keep in mind that children with spina bifida can go on to college, hold jobs and have families. Special accommodations may be necessary along the way, but encourage your child to be as independent as possible.

Coping and support

News that your newborn child has a condition such as spina bifida can naturally cause you to feel grief, anger, frustration, fear and sadness. There's good reason to hope, however, because most people with spina bifida live active, productive and full lives — especially with encouragement and support from loved ones.

Independent mobility is an important and appropriate goal for all children with spina bifida. This may mean walking with or without braces, using walking aids (such as canes or crutches) or exclusively using a wheelchair. They benefit from encouragement to participate in activities with their peers, and caregivers can help adjust activities to accommodate physical limitations.

Many children with spina bifida have normal intelligence, but some may need educational intervention for learning problems. Some children experience difficulty with attention, concentration or language that requires treatment from professionals outside of school.

As for any child with a chronic medical condition, children with spina bifida may benefit from meeting with mental health professionals, such as a child psychologist, to assist with adjustment and coping. Most children with spina bifida are resilient and adapt to their challenges with support from their parents, teachers and other caregivers.

If your child has spina bifida, you may benefit from finding a support group of other parents who are dealing with the condition. Talking with others who understand the challenges of living with spina bifida can be helpful.

Preparing for an appointment

Your doctor will likely suspect or diagnose your baby's condition during your pregnancy. If that's the case, you'll likely consult with a multispecialty team of physicians, surgeons and physical therapists at a center that specializes in spina bifida treatment.

Here's some information to help you get ready for your appointment, and what to expect from your health care providers if there are suspicions that your baby may have spina bifida.

What you can do

To prepare for the appointment:

  • Be aware of any pre-appointment instructions. At the time you make the appointment, be sure to ask if there's anything you need to do in advance, such as drink extra water before an ultrasound.
  • Make a list of all medications, vitamins, herbs and supplements that you took before and during your pregnancy, and the dosages.
  • Ask a family member or friend to come with you, if possible. Sometimes it can be difficult to remember all the information provided to you during an appointment. Someone who accompanies you may remember something that you missed or forgot.
  • Create a list of questions to ask your doctor, starting with the most important, in case time runs out.

For spina bifida, some basic questions to ask include:

  • Is spina bifida present and how severe is it?
  • Is there evidence of water on the brain (hydrocephalus)?
  • Can my baby be treated during pregnancy?
  • What will be done for my baby immediately after birth?
  • Will the treatment cure my child?
  • Will there be any lasting effects?
  • Who can I contact to find out about community resources that may be able to help my child?
  • What is the likelihood of this happening again in future pregnancies?
  • How can I keep this from happening again in the future?
  • Are there any brochures or other printed material that I can have? What websites do you recommend?

In addition to the questions that you've prepared, don't hesitate to ask other questions during your appointment.

What to expect from your doctor

Be ready to answer questions from your doctor to reserve time to go over any points you want to focus on. Your doctor may ask, for example:

  • Have you ever had a child with spina bifida or other birth defects?
  • Is there a family history of spina bifida?
  • Did you take folic acid (vitamin B-9) before and during your pregnancy?
  • Are you on any anti-seizure medications, or were you taking them at the beginning of your pregnancy?
  • If necessary, are you able to travel to a facility that offers specialized care?

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