Understanding the basics

What Causes Encephalocele? Neural Tube Defects, Genetics, and Risk Factors

· 2 min read · 343 words

In short: What Causes Encephalocele? Neural Tube Defects, Genetics, and Risk Factors

  • Encephalocele results from incomplete neural tube closure; the exact reason in any one baby is usually unknown.
  • Causes are typically multifactorial (genetic + environmental), and most cases are sporadic.
  • Family history of neural tube defects, some genes, and certain maternal factors can raise risk.
  • Folic acid prevents other neural tube defects and is recommended, though its specific effect on encephalocele is less clear.

One of the first and most painful questions parents ask is, "Did I cause this?" The honest, reassuring answer is that encephalocele is almost never the result of anything a parent did.

The short answer

Encephalocele is caused by the neural tube failing to close completely in early pregnancy. Why that happens in a given baby is usually not fully known. Most cases appear to result from a combination of genetic and environmental factors rather than a single cause, and most occur sporadically — out of the blue, in families with no history.

Genetic factors

There is a genetic component for some families. Encephalocele is more common in families with a history of neural tube defects such as spina bifida or anencephaly. Certain genes have been linked to specific types — for example, changes in the CEP290 gene have been associated with some occipital (back-of-head) encephaloceles. And more than 30 genetic syndromes can include encephalocele as a feature (covered in a later article).

Environmental and maternal factors

Researchers have studied several factors that may raise the risk of neural tube defects in general, including:

  • Folate (folic acid) deficiency before and during early pregnancy
  • High body temperature in early pregnancy (high fever, possibly hot tubs/saunas)
  • Maternal diabetes that isn't well controlled
  • Obesity
  • Certain medications, such as some anti-seizure drugs
  • Possible exposure to certain toxins or infections

Important nuance: while folic acid clearly lowers the risk of anencephaly and spina bifida, the protective effect specifically for encephalocele is less firmly established. Even so, adequate folic acid is recommended for all women who could become pregnant, because it prevents other serious neural tube defects.

Why "you didn't cause this" is the truth

The closure step happens in the first month, frequently before a pregnancy is known. Encephalocele is not caused by a fall, by stress, by lifting, or by ordinary daily life. Carrying guilt is understandable, but it isn't supported by the science.

Sources

  • CDC — Encephalocele (Birth Defects)
  • NORD — Encephalocele
  • StatPearls (NCBI Bookshelf) — Encephalocele
  • Nationwide Children's Hospital — Encephalocele
  • Cleveland Clinic — Encephalocele

Questions people ask

Will my next baby have it too??

Recurrence risk depends on the cause; a geneticist can give you personalized numbers. (See the genetic counseling article.) Did a medication cause it? Talk to your doctor about your specific medications; most are not implicated, but a few (like certain seizure drugs) are studied. Should I take folic acid for future pregnancies? Generally yes — discuss the right dose with your doctor, which may be higher if you've had an affected pregnancy.

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