Core Terms & Classification
Dysraphism
Dysraphism is incomplete closure or fusion of midline structures during development.
In short: Dysraphism
- "Cranial dysraphism" refers to the skull and brain, the category encephalocele belongs to.
- It reflects a problem in how midline tissues come together.
- Spinal dysraphism includes conditions like spina bifida.
- Most encephaloceles occur at or near the midline of the skull.
What it is
Dysraphism is the developmental failure of normal midline fusion. The body's midline structures — including the neural tube and the bones that form around it — normally come together during development; dysraphism describes when that fusion is incomplete.
Understanding Dysraphism
Because most encephaloceles occur at or near the midline of the skull, they are considered a form of cranial dysraphism. The term groups together conditions that share this underlying closure problem, whether in the skull (cranial) or the spine (spinal). This shared mechanism is part of why neural tube defects are studied and discussed as a family.
Why it matters
Knowing that encephalocele is a cranial dysraphism connects it to a broader understanding of how midline structures form and fail to form. It reinforces why many encephaloceles appear centrally on the head or face and why the midline is a focus during imaging and surgery.
Common questions
Is encephalocele a dysraphism?
Yes — it is typically a cranial dysraphism.
Does dysraphism only affect the spine?
No — it can affect the skull (cranial) or spine (spinal).
Why are most encephaloceles midline?
Because the neural tube and skull form along the body's central axis.
Bottom line
Dysraphism is faulty midline closure, and encephalocele is a cranial example.
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