Colpocephaly: What It Is, Why It Happens, and How It's Treated
Updated: 2 days ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: October 2026
Quick Answer
Colpocephaly is a rare condition present at birth in which the back portions of the brain's ventricles are larger than expected, usually because the corpus callosum has not fully developed. Symptoms vary and can include seizures, intellectual disability and speech delay. It is confirmed with exams, imaging and genetic testing. There is no cure; care focuses on managing symptoms. [1]
What the research says
Corpus callosum agenesis is often not truly "isolated." In a Dutch study of 25 fetuses with apparently isolated complete agenesis of the corpus callosum on ultrasound, microarray testing found a genetic cause in 2 of 18 tested (11.1%). Among continuing pregnancies with no cause found on microarray, 30% of children showed intellectual disability, and postnatal MRI and physical exams often (64%) revealed additional physical anomalies. (de Wit et al., Prenatal Diagnosis, 2017) [2]
Prenatal ultrasound can give early clues. A review of fetal imaging found that complete agenesis of the corpus callosum is easy to diagnose by ultrasound after mid-pregnancy, and that a missing cavum septum pellucidum and colpocephaly are critical signs on the axial view. (Moradi et al., Journal of Clinical Ultrasound, 2022) [3]
Some people are not diagnosed until adulthood. A case report described a 54-year-old man whose colpocephaly and corpus callosum dysgenesis were found by chance on a CT scan during an emergency visit. The authors note it can be an incidental finding in people without symptoms. (Mirzaei et al., International Journal of Surgery Case Reports, 2024) [4]
What Is Colpocephaly?
Colpocephaly is a condition present at birth in which a portion of the fluid-filled spaces (ventricles) at the back of a child's brain are larger than expected. [1]
The brain has four ventricles filled with cerebrospinal fluid (CSF), the fluid that surrounds the brain and spinal cord. The ventricles help the brain circulate and drain CSF. There is one lateral ventricle on each side of the brain, and the part that extends toward the back of the brain, near the occipital lobe, is called the occipital horn. In colpocephaly, these occipital horns are enlarged. [1]
Colpocephaly is not common. It usually happens when surrounding brain tissue has not developed as expected, and symptoms vary depending on that tissue development. By itself, it is not typically life-threatening. [1] It is a type of cephalic disorder, a condition that affects the development of the brain and spinal cord (the central nervous system). [1]
Who Might Get Colpocephaly?
Colpocephaly is present at birth. Because it relates to how the brain develops before birth, it is something a child is born with rather than something caught or developed later. [1]
How Common Is Colpocephaly?
Colpocephaly is described as a rare cephalic disorder. [1] Because symptoms range from none at all to severe, some cases may go undiagnosed. A reliable overall prevalence figure is not available.
How Does Colpocephaly Affect the Body?
The enlarged ventricles reflect a deeper difference in brain development. The corpus callosum, the middle portion of the brain that helps the two halves communicate, does not fully form. This is called dysgenesis (underdevelopment) or agenesis (complete absence) of the corpus callosum. Because of this, extra space is left that fills with CSF. [1]
Useful terms:
Ventricles: fluid-filled spaces inside the brain; there are four.
Cerebrospinal fluid (CSF): the fluid that surrounds the brain and spinal cord.
Occipital horn: the part of each lateral ventricle that extends toward the back of the brain.
Corpus callosum: the structure that helps the two halves of the brain communicate.
Microcephaly: a smaller-than-expected head size.
What Are the Symptoms of Colpocephaly?
Symptoms can include: [1]
difficulty with problem-solving
attention difficulties and hyperactivity
speech delay
intellectual disability
challenges with coordination and movement
hearing issues
muscle spasms
seizures
small head size (microcephaly)
vision problems
Symptoms affect each child differently, and some children have no noticeable symptoms. If symptoms are severe, they may limit a child's ability to be independent and do things safely on their own. [1]
What Causes Colpocephaly?
Colpocephaly happens when certain parts of the brain do not develop fully, specifically the corpus callosum. The extra space this leaves fills with CSF. [1]
Researchers do not know exactly why this happens, and there are likely several underlying causes. Some cases may pass through a biological family, while others happen because of genetic variants or new changes in DNA. [1]
What Are the Risk Factors?
Studies suggest the following pregnancy complications may raise the chance of a child having colpocephaly: [1]
Alcohol use disorder during pregnancy: heavy alcohol use while pregnant.
Infection during pregnancy: such as toxoplasmosis.
Malnutrition: not getting adequate nutrition during pregnancy.
Decreased blood flow to the placenta: reduced circulation to the organ that nourishes the fetus.
If you are pregnant or planning to be, talk with a pregnancy care provider, who can help you and the baby stay healthy.
What Conditions Can Happen With Colpocephaly?
Children often have colpocephaly together with another underlying condition affecting the brain, eyes, spinal cord or nerves. [1] These include:
Cerebellar atrophy: shrinkage or underdevelopment of the cerebellum.
Coloboma: missing eye tissue present at birth.
Hydrocephalus: excess fluid buildup in the brain's ventricles.
Lissencephaly: an abnormally smooth brain surface.
Microgyria or macrogyria: small or large brain folds.
Myelomeningocele: a severe form of spina bifida affecting the spinal cord.
Neurofibromatosis: a genetic condition that causes tumors on nerve tissue.
Optic nerve hypoplasia: an underdeveloped optic nerve.
How Is Colpocephaly Diagnosed?
A provider may suspect colpocephaly on a prenatal ultrasound, but an official diagnosis usually comes after birth, when clearer images of the brain can be obtained. [1][3] The provider will do a physical exam and a neurological exam and review the family medical history. They may recommend: [1]
Prenatal ultrasound: may raise suspicion before birth.
Physical exam: checks overall health and head size.
Neurological exam: assesses brain and nervous system function.
CT scan: creates detailed images of the brain.
MRI: produces detailed brain images without radiation.
Genetic testing: looks for genetic variants linked to the condition.
Can an Adult Be Diagnosed With Colpocephaly?
An adult may be diagnosed later in life if they have a very mild case, but this is extremely rare. [1][4]
Is Colpocephaly Curable?
Colpocephaly has no cure, but healthcare providers can treat some of the symptoms it causes. Talk with your child's provider about the treatments that can help. [1]
How Is Colpocephaly Treated?
Treatment focuses on managing symptoms. Your child's provider may recommend: [1]
Special education programs: support learning at school.
Speech therapy: helps with speech delay and communication.
Physical therapy: improves coordination and movement.
Occupational therapy: builds everyday living skills.
Glasses: address vision problems.
Hearing aids: address hearing issues.
Antiseizure medication: controls seizures, if they occur.
What Is the Prognosis for Colpocephaly?
A child's outlook depends on how much of the brain tissue did not develop and whether any other brain structures did not develop as expected. Each child's outlook is as unique as they are, so talk to their provider about what to expect. [1]
What Is the Life Expectancy?
Colpocephaly itself is not life-threatening. If it happens together with other brain conditions, it may lead to disability and may affect your child's outlook. Your child's provider can give the most accurate information for your child's situation. [1]
Can Colpocephaly Be Prevented?
Colpocephaly cannot be prevented with certainty, but you can take steps toward a healthy pregnancy. Talk with your provider about the prenatal care that is right for you. [1]
When Should You See a Healthcare Provider?
Contact your child's provider if you notice unusual behavior or developmental delays. You know your child best, so speak up if anything does not seem right. [1]
Emergency alert: If your child has a seizure for the first time, contact emergency services. [1]
Questions to Ask Your Doctor
How can I best care for my child?
What symptoms should I look out for?
When should I be concerned about changes in behavior?
What therapies do you recommend for my child?
What educational resources can help my child?
Conclusion
Colpocephaly is a rare condition present at birth in which the back portions of the brain's ventricles are larger than expected, usually because the corpus callosum did not fully form. The exact cause is not fully understood. Symptoms range from none to seizures, intellectual disability, speech delay, vision or hearing problems and coordination difficulties. Diagnosis may begin with a prenatal ultrasound and is usually confirmed after birth with exams, imaging and genetic testing. There is no cure, but therapies, school supports, glasses, hearing aids and medication when needed can help children manage symptoms and thrive. [1][2][3] Contact your child's provider about developmental delays or behavior changes, and contact emergency services if your child has a seizure for the first time.
Frequently Asked Questions
What is colpocephaly?
Colpocephaly is a rare condition present at birth in which the back portions of the brain's fluid-filled ventricles are larger than expected.
What causes colpocephaly?
Colpocephaly usually happens when the corpus callosum, which connects the brain's two halves, does not fully form, leaving extra space that fills with cerebrospinal fluid. The exact reason is not known.
Is colpocephaly genetic?
Some cases may pass through a biological family, and others happen because of genetic variants or new DNA changes.
What pregnancy complications raise the risk of colpocephaly?
Studies suggest alcohol use disorder, infections such as toxoplasmosis, malnutrition and decreased blood flow to the placenta.
What are the symptoms of colpocephaly?
Symptoms can include seizures, intellectual disability, speech delay, small head size, vision and hearing problems, muscle spasms, and attention and coordination difficulties.
Can a child have colpocephaly without symptoms?
Yes. Symptoms affect each child differently, and some children have no noticeable symptoms.
Is colpocephaly life-threatening?
By itself, colpocephaly is not typically life-threatening. When it occurs with other brain conditions, it may lead to disability.
What conditions can occur alongside colpocephaly?
Common companions include hydrocephalus, cerebellar atrophy, coloboma, lissencephaly, microgyria or macrogyria, myelomeningocele, neurofibromatosis and optic nerve hypoplasia.
How is colpocephaly diagnosed?
Colpocephaly may be suspected on a prenatal ultrasound and is usually confirmed after birth with physical and neurological exams, family history, CT or MRI, and genetic testing.
Can an adult be diagnosed with colpocephaly?
Yes, but this is extremely rare and happens only in very mild cases.
Is there a cure for colpocephaly?
No. Providers can treat some of the symptoms through special education, therapies, glasses, hearing aids and antiseizure medication.
Can colpocephaly be prevented?
There is no definite way to prevent it, but good prenatal care and a healthy pregnancy are recommended.
What should I do if my child has a seizure for the first time?
Contact emergency services.
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References
Cleveland Clinic Staff. Colpocephaly: What It Is, Causes, Symptoms & Prognosis. Cleveland Clinic. November 25, 2024. https://my.clevelandclinic.org/health/diseases/21990-colpocephaly
de Wit MC, Boekhorst F, Mancini GM, Smit LS, Groenenberg IAL, Dudink J, de Vries FAT, Go ATJI, Galjaard RJH. Advanced genomic testing may aid in counseling of isolated agenesis of the corpus callosum on prenatal ultrasound. Prenat Diagn. 2017;37(12):1191-1197. PMID 28921563. https://doi.org/10.1002/pd.5158
Moradi B, Taherian R, Tahmasebpour AR, Sanei Taheri M, Kazemi MA, Pak N, Shirazi M, Radmanesh A, Oztekin O, Arab-Ahmadi M. Fetal corpus callosum abnormalities: Ultrasound and magnetic resonance imaging role. J Clin Ultrasound. 2022;50(7):989-1003. PMID 35488776. https://doi.org/10.1002/jcu.23212
Mirzaei S, Motaghed Z, Zarei H. Colpocephaly and corpus callosum dysgenesis in an adult: A rare case report. Int J Surg Case Rep. 2024;124:110484. PMID 39447335. https://doi.org/10.1016/j.ijscr.2024.110484
Medical disclaimer
This article is for general information only and is not a substitute for professional medical advice, diagnosis or treatment. Always seek the advice of your physician or other qualified health provider with any questions about a medical condition. Never disregard professional medical advice or delay seeking it because of something you read here. Colpocephaly is present at birth and needs individualized evaluation; each child's outlook depends on their specific brain development. Contact your child's provider about behavior changes or developmental delays, and contact emergency services if your child has a seizure for the first time.
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