Short answer · Medically reviewed summary · Last updated: 2026-05-08
TL;DR: Encephalocele is a rare neural tube defect occurring when the skull fails to close completely during early fetal development, allowing brain tissue to protrude through the opening. While the exact cause is often unknown, it is likely a combination of genetic predispositions and environmental factors that disrupt the closure of the neural tube within the first 45 days of pregnancy. What causes an Encephalocele to form? The primary cause of encephalocele is a failure of the neural tube to close properly during the first few weeks of embryonic development.
Which are the causes of Encephalocele?
Causes of Encephalocele explained: genetic and environmental factors, reviewed against medical sources, plus patient perspectives.
TL;DR: Encephalocele is a rare neural tube defect occurring when the skull fails to close completely during early fetal development, allowing brain tissue to protrude through the opening. While the exact cause is often unknown, it is likely a combination of genetic predispositions and environmental factors that disrupt the closure of the neural tube within the first 45 days of pregnancy.
What causes an Encephalocele to form?
The primary cause of encephalocele is a failure of the neural tube to close properly during the first few weeks of embryonic development. Think of this like a zipper on a jacket that gets stuck halfway; if the "zipper" of the skull doesn't close completely, a gap remains. Because the brain is developing rapidly, it can push through this opening, resulting in an encephalocele. In most cases, this is a multifactorial process, meaning it is not triggered by a single event but by a complex interplay of biology and environment.
Is there a genetic component to Encephalocele?
While most cases of encephalocele occur sporadically (without a family history), genetic research has identified links to certain syndromes and chromosomal abnormalities. Currently, researchers are investigating specific gene mutations that regulate neural tube formation. It is important to distinguish between a cause (a direct mutation) and a risk factor (a condition that increases the likelihood of the defect).
- Chromosomal anomalies: Conditions like Meckel-Gruber syndrome are strongly associated with encephalocele.
- Folic acid deficiency: Low maternal folate levels are a well-documented risk factor for neural tube defects.
- Maternal health: Conditions such as pre-gestational diabetes or high fever during early pregnancy may increase risk.
Is the etiology of Encephalocele fully understood?
The exact etiology of encephalocele remains a subject of active clinical research. While we understand the structural mechanism—the failure of the skull to fuse—the molecular "trigger" that stops that process is often elusive. Ongoing studies are utilizing advanced genomic sequencing to better understand why some embryos experience this defect while others do not. At DiseaseMaps.org, our community of 27 members living with encephalocele highlights the diverse presentations of this condition, underscoring the need for continued research into its origins.
Next steps
- Consult with a clinical geneticist to discuss potential underlying genetic factors if you have a family history.
- Speak with a neurosurgeon specializing in pediatric congenital defects for a comprehensive evaluation.
- Join the DiseaseMaps.org community to connect with other families and share experiences regarding encephalocele management.
Medical disclaimer: This information is for educational purposes only and should not replace professional medical advice, diagnosis, or treatment.
References
- NIH Genetic and Rare Diseases Information Center (GARD): Encephalocele.
- Orphanet: Neural tube defect (ORPHA:647).
- OMIM (Online Mendelian Inheritance in Man): Encephalocele, frontal.
- Centers for Disease Control and Prevention (CDC): Facts about Neural Tube Defects.
