Arnold Chiari malformation
Hx of Arnold Chiari malformation Type II
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VP shunt in situ, colpocephaly, absent corpus callosum posteriorly - axial head CT
Sagittal: lifting up of the tentorium cerebellae and inferior tonsillar herniation. Small posterior fossa. No brain stem herniation. Note that the calvarium is not lemon shaped.
A Chiari II malformation is a relatively common congenital malformation of the spine and posterior fossa characterised by lumbosacral spina bifeda aperta / myelomeningocoele and a small posterior fossa with descent of the brain stem. Numerous associated abnormalities are also frequently encountered.