Craniorachischisis is a very rare and severe birth condition that affects the brain and spine. In plain terms, craniorachischisis refers to a pattern of changes in which much of the brain and spinal column do not form and close as expected early in pregnancy. The condition is usually found on prenatal ultrasound, and the early signs of craniorachischisis are often seen before birth. Craniorachischisis is lifelong, but it is usually fatal before birth or shortly after delivery. There is no curative treatment for craniorachischisis, so care focuses on supportive care, comfort, and counseling for the pregnancy and family.
How many people live with Craniorachischisis?
There is no reliable worldwide estimate and no reliable United States estimate for people living with craniorachischisis, because this very rare condition is usually fatal before birth or soon after delivery rather than a condition people live with long term (Orphanet, 2024; Genetic and Rare Diseases Information Center, 2024). Reports are usually given as affected pregnancies or births instead of living people, so a current global or U.S. living count is not available.
Overview
CraniorachischisisSymptoms
Craniorachischisis causes severe birth defects of the brain, skull, and spine. It is usually recognized before birth or at delivery, with an open skull and spine and loss of brain tissue.
Outlook and prognosis
Craniorachischisis is a very severe neural tube defect. Most affected babies die before birth or live only a short time after delivery. Future pregnancy risk can often be lowered with folic acid before conception and early prenatal care.
Causes and risk factors
Craniorachischisis usually happens very early in pregnancy when the neural tube does not close, often because of a new developmental change rather than something a parent caused. Risk may be higher with low folic acid, certain seizure medicines, poorly controlled diabetes, obesity, or a previous affected pregnancy.
Genetic influences
Genetics can matter in craniorachischisis, but it is usually not caused by a single inherited gene change. Many cases likely reflect a mix of genetic susceptibility and environmental factors, especially problems with folate use early in pregnancy.
Diagnosis
Craniorachischisis is usually diagnosed before birth from clear imaging findings on prenatal ultrasound. The diagnosis of Craniorachischisis is often confirmed by the pattern of clinical features seen at birth. Blood screening in pregnancy may also support the diagnosis.
Treatment and drugs
Craniorachischisis is managed with specialist pregnancy care, clear counseling, and emotional support for families. If a baby is born alive, treatment focuses on comfort, breathing support if appropriate, and gentle feeding. Genetic counseling can help with future pregnancy planning.
Symptoms
Craniorachischisis is usually first noticed during pregnancy because the brain, skull, and spine do not close and form in the usual way. In medical terms, this is craniorachischisis; in everyday life, it means there is a very severe opening affecting the head and spine before birth. The early features of craniorachischisis are often seen on prenatal ultrasound rather than felt as symptoms. This condition is very serious, and many affected pregnancies end in miscarriage, stillbirth, or death shortly after birth.
Part of the skull does not form, so the brain is not fully enclosed. This often leaves delicate brain tissue exposed instead of protected by bone and skin.
Large parts of the brain, especially the upper brain, may be severely underdeveloped or absent. Because these areas help control awareness, thinking, and many basic body functions, long-term survival is not possible.
The spine remains open from the neck downward through much or all of the back. Nerves and spinal cord tissue may be exposed, which severely affects movement and body control.
Skin and bone may not fully cover the affected areas of the head and back. Without this protection, the nervous system is left very vulnerable during development.
How people usually first notice Craniorachischisis?
Craniorachischisis is usually first noticed during pregnancy, often on an early ultrasound, because the baby’s brain and spine do not develop and close in the usual way. In many cases, doctors may also suspect it after prenatal screening shows unusually high levels of alpha-fetoprotein, a protein that can rise when the neural tube does not close properly. When people ask about the first signs of craniorachischisis, they are most often talking about these prenatal test findings, since this condition is typically recognized before birth rather than later in childhood.
Types of Craniorachischisis
No distinct types of Craniorachischisis are widely recognized.
Can I slow down the onset of symptoms?
No. Craniorachischisis develops very early in pregnancy, when the brain and spine do not close the way they should, so there is no proven way to slow the onset once it has begun. The main evidence-based approach is to lower risk before and very early in pregnancy, especially by getting enough folic acid and by working with a doctor to manage diabetes, review seizure medicines, and avoid high fever or overheating; these steps may reduce risk, but they do not guarantee prevention. If pregnancy is being planned, early prenatal care and folic acid guidance are the standard medical steps, and while they cannot change every outcome, they are still worth discussing.
What genetics can tell you about symptoms
Genetics can help explain why craniorachischisis happens, but it usually does not predict a wide range of symptoms because this condition is almost always very severe from the start of development. Changes in genes involved in early neural tube formation may raise the chance of the condition, and in rare families they may partly influence how extensive the brain and spine changes are, but the overall picture is typically profound and begins very early in pregnancy. In other words, genetics is more useful for understanding risk and possible recurrence than for forecasting mild versus severe symptoms, since craniorachischisis is generally severe regardless of the exact genetic change.
Causes and risk factors
Craniorachischisis usually begins very early in pregnancy, often before someone knows they are pregnant. Changes in genes that guide early brain and spine development, whether inherited or new, can underlie craniorachischisis. It is rarely just one factor, and the mix matters. Low folate levels, some anti-seizure medicines, poorly controlled diabetes, obesity, and high body temperature from fever or overheating in early pregnancy can raise the risk factors for craniorachischisis. A previous pregnancy affected by a neural tube defect or a close family history can also increase risk, and folic acid before conception and in early pregnancy can help lower it.
What are the most common causes or risk factors?
Craniorachischisis usually happens because of a mix of genetic factors and pregnancy-related exposures, not because of anything a parent did on purpose. The strongest known risks are not getting enough folic acid before and during early pregnancy, a family history or a past pregnancy affected by a similar brain or spine birth difference, and certain gene changes that affect very early development. Other well-known risk factors include poorly controlled diabetes, obesity, some anti-seizure medicines such as valproate, and very high body temperature in early pregnancy, such as from a high fever or frequent hot tub use.
Environmental and biological risk factors
Craniorachischisis develops very early in pregnancy, so the main risks are usually present around conception and in the first month afterward. Doctors often group risks into internal (biological) and external (environmental). For this condition, the strongest established factors involve folate status, certain medicines, diabetes, and early heat exposure.
Low folate status before conception and in the earliest weeks of pregnancy is one of the clearest risk factors for craniorachischisis. This can happen when folate intake is low or when the body has trouble absorbing or using folate.
Low vitamin B12 can add to neural tube defect risk, especially when folate is also low. Because the neural tube closes very early, this shortage may matter before pregnancy is recognized.
Some anti-seizure medicines, especially valproate, and drugs that interfere with folate can raise risk. The effect is most important around conception and in the first weeks of pregnancy.
Diabetes present before pregnancy is linked to a higher chance of craniorachischisis, particularly if blood sugar is high very early on. This risk is most relevant during the short period when the neural tube is forming and closing.
Genetic risk factors
Craniorachischisis starts very early in development, and genes involved in neural tube closure appear to play an important role. When people look for the genetic causes of craniorachischisis, the answer is usually not one single inherited change. Most cases seem to reflect a complex mix of genetic susceptibility, although a rare gene or chromosome change is sometimes found. Carrying a genetic change doesn’t guarantee the condition will appear.
Family history: Having a close relative with craniorachischisis or another neural tube defect can raise the chance in a future pregnancy. This suggests that inherited susceptibility may run in some families.
Prior pregnancy: After one pregnancy affected by craniorachischisis or another open neural tube defect, the chance is higher in a later pregnancy. Doctors often discuss this as recurrence risk, which can reflect shared family genes even when no single gene is found.
Closure genes: Rare changes in genes that guide the neural tube as it closes have been linked to craniorachischisis. These genes help cells line up and move in a coordinated way during the earliest stages of development.
Chromosome changes: In a small number of pregnancies, an extra, missing, or rearranged piece of chromosome may be part of the explanation. These larger genetic changes can sometimes be found with chromosome testing or microarray testing.
New variants: Some genetic changes may happen for the first time in the embryo instead of being inherited from either parent. When this happens, there may be no known family history even though genes are involved.
Lifestyle risk factors
Craniorachischisis develops very early in pregnancy, so lifestyle habits do not change the condition after it has occurred. In practice, discussion of how lifestyle affects craniorachischisis mainly relates to lowering the chance of this neural tube defect in a future pregnancy. The most important lifestyle risk factors for craniorachischisis are linked to preconception nutrition, weight and metabolic health, and exposure-related habits during early pregnancy.
Not getting enough folic acid before conception and in the first weeks of pregnancy can raise the risk of craniorachischisis because neural tube closure depends on adequate folate. For people asking about lifestyle risk factors for craniorachischisis, this is the clearest modifiable factor.
Diets low in folate-rich foods and overall micronutrients may reduce the nutritional support needed for normal early fetal development. Improving diet before pregnancy may help lower the chance of severe neural tube defects, including craniorachischisis.
Pre-pregnancy obesity is linked with a higher risk of neural tube defects, and sedentary habits can contribute to excess weight and poorer metabolic health. In this way, how lifestyle affects craniorachischisis is mostly through risk in a future pregnancy rather than through symptom control.
Poorly managed diabetes around conception increases the risk of major congenital malformations, including neural tube defects. Lifestyle steps that support glucose control, such as consistent meals and physical activity, may help reduce that risk when planning pregnancy.
Risk prevention
Craniorachischisis develops very early in pregnancy, often before someone knows they are pregnant, so prevention focuses on lowering the chance of it happening rather than preventing symptoms later on. The most important step is getting enough folic acid before conception and in early pregnancy, although not all cases can be prevented. Prevention isn’t about perfection, it’s about small steps that add up. Many people searching for how to prevent craniorachischisis before pregnancy are really asking about ways to lower the risk of severe neural tube defects.
Taking folic acid every day before pregnancy and through early pregnancy is the best-known way to lower the risk of craniorachischisis and related neural tube defects. For most people, this means 400 micrograms daily, while those with a higher-risk history may need a higher dose decided with a doctor.
Because craniorachischisis forms in the first weeks of pregnancy, it helps to start prevention before trying to conceive. A pre-pregnancy visit can review supplements, medical conditions, and any past pregnancy affected by a neural tube defect.
Some medicines, especially certain anti-seizure drugs and a few other treatments, can raise the risk of neural tube defects if they are taken around conception. Never stop a prescribed medicine on your own, but ask your doctor whether a safer option or extra folic acid is needed before pregnancy.
Poorly controlled diabetes and some nutritional problems can increase the risk of craniorachischisis and other birth differences. Good blood sugar control and treating vitamin deficiencies before pregnancy may help lower risk.
Can you prevent Craniorachischisis?
Craniorachischisis cannot be fully prevented, and in many pregnancies it happens even when parents did nothing wrong. The best-proven step that can lower the risk is getting enough folic acid, a B vitamin, before pregnancy and during the very early weeks of pregnancy, when the brain and spine are forming. Even with that, it is not always possible to prevent it.
Transmission
Craniorachischisis is not infectious, so it cannot be caught from another person through touch, the air, food, or sex. Instead, it develops very early in pregnancy, before many people even know they are pregnant.
When families ask about how craniorachischisis is inherited, it is usually not passed down in a simple, predictable way like some single-gene conditions. Most cases are thought to happen because of a mix of genetic susceptibility and early pregnancy factors, so many living with a pregnancy affected by craniorachischisis have no family history at all. Having had one pregnancy affected by a neural tube defect can raise the chance in a future pregnancy, but this does not mean craniorachischisis will definitely happen again.
When to test your genes
For craniorachischisis, genetic testing is not usually the main tool for early detection, because most cases are thought to arise from a mix of genetic susceptibility and environmental factors rather than one single gene change. Testing may be considered if you have had a pregnancy affected by a neural tube defect, have a strong family history, or if a specialist recommends it to guide recurrence counseling and folate planning before pregnancy.
Diagnosis
Craniorachischisis is usually identified very early, often during pregnancy, because the brain and spine do not form and close in the usual way. The diagnosis of craniorachischisis is often based on clear physical findings on prenatal imaging and may be confirmed after birth with an examination. Getting a diagnosis is often a turning point toward answers and support.
Ultrasound is often the main test used to diagnose craniorachischisis during pregnancy. It can show major openings of the skull and spine, along with severe changes in brain development.
Maternal blood tests may show a higher level of alpha-fetoprotein, which can happen with open neural tube defects. This result cannot confirm craniorachischisis by itself, but it can support the need for closer imaging.
In some pregnancies, fetal MRI is used to give a more detailed view of the brain and spinal structures. This can help confirm imaging findings and clarify the extent of the condition.
If the condition is diagnosed after delivery, doctors examine the visible features of the head, brain covering, and spine. These clinical features are usually severe and often make the diagnosis clear.
How is Craniorachischisis diagnosed?
Craniorachischisis is usually diagnosed during pregnancy with an ultrasound, which can show that the baby’s skull and spine did not close normally very early in development. Doctors may also use a pregnancy blood test that can be higher than expected when there is an open problem in the brain or spine, and sometimes a fetal MRI, which is a more detailed scan, to confirm what the ultrasound shows. Genetic testing is not the main way this condition is diagnosed, but it may be offered in some cases to look for an underlying chromosome or gene problem.
Stages of Craniorachischisis
Craniorachischisis does not have defined progression stages. This is because it is a very severe birth defect that develops early in pregnancy rather than a condition that gradually worsens over time in a predictable sequence. Often the process begins when you notice changes in daily life, but craniorachischisis is usually identified before birth on prenatal ultrasound and may be confirmed with other imaging tests and maternal blood screening. In practice, doctors focus on confirming the diagnosis, looking for related findings, and explaining what the results mean for the pregnancy and delivery plan.
Outlook and prognosis
The outlook for craniorachischisis is extremely poor, because the condition is typically incompatible with long-term survival. Most affected pregnancies end in miscarriage, stillbirth, or elective termination after prenatal diagnosis, and infants born alive usually die before birth, during delivery, or within hours to days after birth. There is no curative treatment, since the brain and spinal cord malformations are profound and cannot be surgically corrected. Mortality is therefore exceptionally high, with survival beyond the newborn period being extraordinarily rare. For families, prognosis discussions usually focus on comfort care, pregnancy management options, and recurrence prevention in future pregnancies with preconception folic acid supplementation.
Long-term effects
For families asking about prognosis, craniorachischisis has an extremely poor outlook. Most affected pregnancies end in miscarriage or stillbirth, and babies who are born alive usually live only a short time. Long-term effects are usually not seen because survival beyond birth is exceedingly rare. In practice, life expectancy in craniorachischisis is measured in hours to days in most reported cases.
Craniorachischisis often leads to miscarriage or stillbirth because the changes in the brain and spine are so severe. This means many families face the condition during pregnancy rather than over years of childhood or adult life.
When a baby with craniorachischisis is born alive, survival is usually very short. Breathing, temperature control, and other basic body functions are often too severely affected to support longer-term survival.
Because craniorachischisis is almost always fatal before or shortly after birth, there is usually no long-term developmental pattern to follow. Doctors often describe these as long-term effects or chronic outcomes, but in this condition the main prognosis is loss of life very early.
How is it to live with Craniorachischisis?
Craniorachischisis is one of the most severe neural tube defects, and in most cases it is not compatible with long-term survival. For many families, the lived experience is shaped not by day-to-day care over years, but by a devastating pregnancy, difficult medical decisions, and intense emotional grief before or shortly after birth. Its effects often ripple through the whole family, touching parents, siblings, and loved ones who may need ongoing emotional support, bereavement care, and time to recover both physically and psychologically.
Treatment and drugs
Craniorachischisis is a very severe neural tube defect, and there is no treatment that can repair the brain and spine changes it causes. In most cases, care focuses on careful diagnosis during pregnancy, clear counseling about what the condition means, and support for the pregnant person and family as they make decisions. If a baby is born alive, treatment is usually comfort-focused rather than curative, with attention to warmth, gentle feeding support if possible, and relief of any distress. Supportive care can make a real difference in how families are guided through delivery planning, newborn care, and bereavement support. Because craniorachischisis cannot be reversed, doctors also talk about prevention for future pregnancies, including folic acid before conception and in early pregnancy.
Can you cure Craniorachischisis?
No, craniorachischisis cannot be cured. It is a very severe condition that starts early in pregnancy, and there is no treatment that can repair the major problems in the brain, skull, and spine; care is usually focused on comfort and support for the baby and family.
Non-drug treatment
Craniorachischisis is a very severe birth condition, and there is no non-drug treatment that can reverse it. Care usually centers on clear counseling, pregnancy and birth planning, and comfort-focused support for the baby and family. Managing this condition often means making difficult decisions during pregnancy or shortly after birth, with help from a specialist team. In many cases, care also includes guidance about the risk of neural tube defects in future pregnancies.
Genetic counseling and maternal-fetal medicine visits can help families understand what craniorachischisis means and what to expect. This often includes review of scan findings, likely outcomes, and options for pregnancy and delivery planning.
Detailed birth planning can help families decide where and how care will happen, whether the goal is time together after birth or comfort-focused care only. Some non-drug options are delivered by specialists, including neonatology, palliative care, social work, and spiritual care teams.
Because craniorachischisis is not survivable, care after birth is usually focused on warmth, gentle handling, skin-to-skin contact, and easing distress. For many, treatment begins not at the pharmacy, but with creating a calm space for bonding, memory-making, and family support.
Perinatal hospice programs support families during pregnancy, delivery, and the time after the baby is born. They can help with emotional support, practical planning, and decisions about keepsakes, photography, or private family time.
Your genes may have an impact on how drugs work for you
For craniorachischisis, there are no standard medicines that treat the condition itself, because it is a very severe problem in early development and care is usually focused on comfort and support. At this time, genetic differences are not used in any routine, well-established way to choose medicines for people living with craniorachischisis, so this is not a condition where drug response testing has a clear role. In families with a past pregnancy affected by a neural tube problem, doctors may talk about folic acid before and early in pregnancy to help lower the chance of it happening again, but that is about prevention rather than changing how a medicine works.
Pharmacological treatments
With craniorachischisis, there is no medicine that can repair the severe brain and spine changes once they have developed. In practice, drug treatment is usually limited to comfort care and, in some pregnancies, medicines related to labor and delivery rather than treatment of craniorachischisis itself. Not everyone responds to the same medication in the same way, but for this condition the main goal of any medicine is symptom relief, not cure.
There is no approved medication that reverses or heals craniorachischisis. Medicines do not rebuild the missing or exposed brain and spinal tissues.
If a baby is born alive, doctors may use pain-relieving medicines such as morphine to ease distress and discomfort. These drugs are part of palliative care, meaning they focus on comfort rather than recovery.
Some newborns may receive sedating medicines such as midazolam if breathing distress or agitation is causing visible suffering. In treatment for craniorachischisis, this is used only for comfort in selected situations.
Medicines such as atropine may sometimes be used to reduce noisy breathing or excess secretions near the end of life. This can help make the baby more comfortable and may also be less distressing for families.
Genetic influences
When a pregnancy is affected by craniorachischisis, families often want to know whether genes played a part. It’s natural to ask whether family history plays a role. In many cases, craniorachischisis does not come from one single inherited gene alone, but from a mix of genetic susceptibility and other influences during very early development. Researchers have linked some cases to changes in genes that help the early embryo fold and close the neural tube properly, especially genes in the planar cell polarity pathway such as VANGL1, VANGL2, CELSR1, and FZD6. Even so, the genetic causes of craniorachischisis are not fully explained in every family, and having a gene change does not always mean the condition will happen again. Because the chance of recurrence can be higher after one affected pregnancy, genetic counseling can help families review their history, discuss testing when appropriate, and plan for future pregnancies.
Is Craniorachischisis genetic?
Genetics can matter in craniorachischisis, but it is usually not caused by a single inherited gene change. Many cases likely reflect a mix of genetic susceptibility and environmental factors, especially problems with folate use early in pregnancy.
Having a genetic risk is not necessarily a diagnosis
Genetic variants are common and are a normal part of human biology. Most do not directly affect health and are simply part of natural human diversity. For many genes, having a variant associated with a condition suggests a possible link rather than a certain diagnosis, especially when several genes and environmental factors are involved. In some situations, though, a single well-understood variant in a particular gene can be enough to confirm a diagnosis.
Pharmacogenetics—how genetics influence drug effects
For families facing craniorachischisis, genetics usually matters most for understanding why it happened, the chance of it happening again, and how a future pregnancy may be managed. There is no medicine that can reverse craniorachischisis once it develops, so genetic results do not usually guide a drug treatment plan for the baby in the way they do for some other conditions. Instead, doctors may use family history and, in some cases, genetic testing to look for factors linked to neural tube defects, including changes that affect how the body handles folate, because this can help explain the genetic risk of craniorachischisis in future pregnancies. Not every difference in response is genetic, but medicines taken before or during early pregnancy can also matter, especially drugs that lower folate levels or interfere with folate use. For many living with the loss of a pregnancy or making decisions in a current one, this often means care focuses on counseling, careful medication review, and planning folic acid use before conception rather than on treatment after diagnosis. In short, genetics plays a larger role in prevention and recurrence counseling than in choosing drugs to treat craniorachischisis itself.
Interactions with other conditions
Craniorachischisis is so severe that most affected pregnancies end in miscarriage, stillbirth, or death shortly after birth, so it does not usually have the kind of long-term disease interactions seen in children or adults living with chronic conditions. Instead, the main medical concern is that craniorachischisis can occur alongside other major birth differences, especially problems affecting the brain, spine, skull, or other organs that develop early in pregnancy. This connection brings us to how the condition interacts with others: when additional structural problems are present, they can further limit survival and shape what doctors see on ultrasound and after birth. In families who have had one pregnancy affected by craniorachischisis or another neural tube defect, the chance of a similar condition in a future pregnancy is higher than average, especially if there is low folate intake, certain anti-seizure medicines, poorly controlled diabetes, or severe obesity. Because of this, care often focuses less on managing overlapping diseases after birth and more on early prenatal screening, reviewing family history, and lowering the risk of recurrent neural tube defects before and during a future pregnancy.
How genes can cause diseases
Humans have more than 20,000 genes, each carrying out one or a few specific functions in the body. One gene instructs the body to digest lactose from milk, another tells the body how to build strong bones and another prevents the body's cells from beginning to multiply uncontrollably and developing into cancer. As all of these genes combined are the building instructions for our body, a defect in one of these genes can have severe health consequences.
Through decades of genetic research, we know the genetic code of any healthy/functional human gene. We have also identified that in certain positions on a gene, some individuals may have a different genetic letter from the one you have. We call these hotspots "Genetic Variations" or "Variants" in short. In many cases, studies have been able to show that having the genetic letter "G" in the position makes you healthy, but having the letter "A" in the same position disrupts the gene function and causes a disease. Genopedia allows you to view these variants in genes and summarizes all that we know from scientific research, which genetic letters (Genotype) have good or bad consequences on your health or on your traits.
What other conditions can cause similar symptoms to Craniorachischisis?
Craniorachischisis can look similar to a few other very serious birth conditions that affect how the brain, skull, and spine form, especially anencephaly, severe forms of spina bifida, and encephalocele, where part of the brain pushes out through an opening in the skull. In pregnancy, doctors usually use ultrasound and other scans to tell these conditions apart, because they can appear similar at first even though they are not the same.
History
Craniorachischisis has been recognized for a very long time because its changes are severe and usually visible early in pregnancy or at birth. Long before modern imaging, doctors and midwives described babies born with a major opening of the skull together with an open spine. In recent decades, awareness has grown, and clearer medical descriptions have helped separate craniorachischisis from other neural tube defects that may affect only the brain or only the spine.
Early accounts were limited to what could be seen after delivery, so families often had little explanation for why it happened. As medical science evolved, researchers came to understand that craniorachischisis develops very early in pregnancy, when the structure that normally closes to form the brain and spinal cord does not close as expected. This was an important shift, because it moved thinking away from older, mistaken ideas and toward a developmental explanation based on early fetal growth.
The history of craniorachischisis also reflects broader progress in prenatal care. Once ultrasound became widely available, many cases could be identified during pregnancy rather than only at birth, which gave families more information and time to talk through care options. Researchers later identified a genetic contribution in some families, but history also showed that not all cases follow the same pattern, and environmental factors can matter too.
Today, what doctors know about craniorachischisis comes from many years of careful observation, better imaging, and improved understanding of early pregnancy development. Knowing this history helps explain why early symptoms of craniorachischisis are usually not symptoms a pregnant person can feel, but findings seen on prenatal scans or blood tests. It also helps make sense of why prevention efforts, especially around folic acid before and in early pregnancy, became such an important part of public health.