Associated Conditions & Findings
Chiari II malformation
Chiari II malformation is a form associated with spina bifida, in which hindbrain structures are displaced downward.
In short: Chiari II malformation
- It is associated with spina bifida rather than encephalocele.
- It involves downward displacement of hindbrain structures.
- It is mentioned to distinguish it from Chiari III.
- It can be associated with hydrocephalus.
What it is
It is a Chiari type associated with spina bifida (myelomeningocele), in which hindbrain structures are displaced downward toward the spinal canal. It is distinct from the encephalocele-associated Chiari III.
Understanding Chiari II malformation
It is mentioned here mainly to distinguish it from Chiari III: Chiari II goes with spina bifida, while Chiari III goes with a posterior encephalocele. Chiari II is commonly associated with hydrocephalus and is part of the spectrum of spinal neural tube defects rather than cranial ones.
Why it matters
Understanding the difference between Chiari II and III helps families avoid confusion, since the two are associated with different neural tube defects — spina bifida versus encephalocele.
Common questions
What is Chiari II associated with?
Spina bifida (myelomeningocele).
How is it different from Chiari III?
Chiari II goes with spina bifida; Chiari III with a posterior encephalocele.
Is it linked to hydrocephalus?
It commonly is.
Bottom line
Chiari II malformation is associated with spina bifida, distinct from the encephalocele-linked Chiari III.
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