Chiari II malformation
Neurological impairment since birth.
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MRI of the brain demonstrates a small posterior fossa with low lying tentorial attachment posteriorly. The tectum is beaked and the corpus callosum dysgenic. Colpocephaly and hydrocephalus are present. Paediatric VP drain has migrated out of the ventricles.
This patient was born with spina bifeda and a myelomeningocoele which was repaired in the neonatal period.