Patient Data
Age: 2 months
Gender: Male
From the case:
Chiari III malformation
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Axial T2

These images reveal a sub-occipital encephalocele with herniation of the cerebellum. Note the cervico-dorsal cord syrinx
Case Discussion
The expanded definition of Chiari III malformations includes both low occipital and high cervical encephaloceles. Corpus callosum dysgenesis is associated in most cases.